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How to Install mlocate (locate and updatedb Commands) on CentOS 7

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<span style="color: #990000; font-family: verdana, geneva, sans-serif; font-size: large;"><span style="line-height: 26px;"><b><u>Install mlocate (locate and updatedb Commands)</u></b></span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b>mlocate</b> is a merging locate and database package. "Merging" means updatedb reuses the existing database to avoid re-reading most of the file system. This makes the database update faster and does not tax the system caches. </span></span><br />
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">mlocate can index several file systems including network file systems for network shares. This package is essential when attempting to quickly find documents in a terminal.</span></span><br />
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Install mlocate</u></b></span></span><br />
<br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">As a matter of best practice we'll update our packages:</span></span><br />
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;"><span style="color: white;"><span style="font-size: 14px; line-height: 19.2px;">yum -y update</span></span></pre>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: verdana, geneva, sans-serif;">Then let's install mlocate and any required packages:</span></span><br />
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;"><span style="color: white;"><span style="font-size: 14px; line-height: 19.2px;">yum -y install mlocate</span></span></pre>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><b><u>Updating mlocate</u></b></span></span><br />
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: verdana, geneva, sans-serif;">The following command will update the search databases:</span></span><br />
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;"><span style="color: white;"><span style="font-size: 14px; line-height: 19.2px;">updatedb</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">mlocate installs a cron job that will run daily to update search databases at:</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="background-color: white; font-size: 15px; line-height: 26px;"></span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b>/etc/cron.daily/mlocate.cron</b></span></span><br />
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How to Install mlocate (locate and updatedb Commands) on CentOS 7

Install mlocate (locate and updatedb Commands) mlocate is a merging locate and database package. "Merging" means updatedb reuses the existing database to avoid re-reading most of the file system. Thi…

07 Jun 2016

How to build nginx with Pagespeed module

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<h1 class="entry-title" style="background-color: white; box-sizing: border-box; font-family: Lato, sans-serif; line-height: 1.1; margin: 20px 0px 10px;">
<span style="color: #990000; font-size: large;"><u>Build nginx with Pagespeed module</u></span></h1>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Pagespeed module you can combine and minify CSS and JavaScript, optimize and convert images, remove comments and whitespaces from HTML, and perform many other optimizations.</span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2rrQaWiS7R4HtM7ZL05mAK2D2kjsuI6Aw-HKQmiQ1swm6miygTu-BQOrkE0ktyOA2Ti9FgxGgRmXdzuHtJ1aG-C1RxtJRgcifg6FQbvgzhtJAQkRVH0AF5zqn2d3jy8xGFe7kasU-Avyd/s1600/NGX_pagespeed_hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2rrQaWiS7R4HtM7ZL05mAK2D2kjsuI6Aw-HKQmiQ1swm6miygTu-BQOrkE0ktyOA2Ti9FgxGgRmXdzuHtJ1aG-C1RxtJRgcifg6FQbvgzhtJAQkRVH0AF5zqn2d3jy8xGFe7kasU-Avyd/s1600/NGX_pagespeed_hackthesec.co.in.png" /></a></div>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span></div>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Update the system and install necessary packages</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo apt-get update && sudo apt-get -y upgrade
sudo apt-get install software-properties-common nano wget dpkg-dev \ build-essential zlib1g-dev libpcre3 libpcre3-dev unzip</span></span></pre>
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<div style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">
<b>Download Nginx and Pagespeed Sources</b></div>
<div style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">
Ubuntu 14.04 comes with <a href="http://www.hackthesec.co.in/search/label/NGINX">Nginx</a> version 1.4, to get the latest stable version of Nginx v1.8.1 we'll need to add the Nginx PPA repository :</div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo add-apt-repository -y ppa:nginx/stable</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Edit the PPA’s sources file and uncomment the deb-src directive.</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo nano /etc/apt/sources.list.d/nginx-stable-trusty.list</span></span></pre>
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<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"> # deb http://ppa.launchpad.net/nginx/stable/ubuntu trusty main
deb-src http://ppa.launchpad.net/nginx/stable/ubuntu trusty main</pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">and update the package lists from the repositories:</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo apt-get update</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Install the Nginx build dependencies:</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo apt-get build-dep nginx</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">cd to the <b>/usr/local/src</b> and download the Nginx source package:</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">cd /usr/local/src
sudo apt-get source nginx</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Download and unpack the latest ngx_pagespeed and psol modules using the following commands:</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">cd nginx-1.8.1/debian/modules
NPS_VERSION=1.10.33.6
sudo wget https://github.com/pagespeed/ngx_pagespeed/archive/release-${NPS_VERSION}-beta.zip -O release-${NPS_VERSION}-beta.zip
sudo unzip release-${NPS_VERSION}-beta.zip
cd ngx_pagespeed-release-${NPS_VERSION}-beta/
sudo wget https://dl.google.com/dl/page-speed/psol/${NPS_VERSION}.tar.gz
sudo tar -xzvf ${NPS_VERSION}.tar.gz</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><div>
<b>Build Nginx with Pagespeed Module</b></div>
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Switch to the directory where you downloaded the Nginx source packages</div>
</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">cd /usr/local/src/nginx-1.8.1</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">The PPA ppa:nginx/stable we have previously added has multiple Nginx packages available: nginx-common, nginx-full, nginx-light, nginx-extras and nginx-doc. For this guide we will add the Pagespeed Module to the nginx-full package, to do that we need to edit the debian/rules file and add the module to the full_configure_flagsas shown bellow:</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">cat debian/rules</span></span></pre>
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<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">full_configure_flags := \
                        $(common_configure_flags) \
                        --with-http_addition_module \
                        --with-http_dav_module \
                        --with-http_geoip_module \
                        --with-http_gunzip_module \
                        --with-http_gzip_static_module \
                        --with-http_image_filter_module \
                        --with-http_spdy_module \
                        --with-http_sub_module \
                        --with-http_xslt_module \
                        --with-mail \
                        --with-mail_ssl_module \
                        --add-module=$(MODULESDIR)/nginx-auth-pam \
                        --add-module=$(MODULESDIR)/nginx-dav-ext-module \
                        --add-module=$(MODULESDIR)/nginx-echo \
                        --add-module=$(MODULESDIR)/nginx-upstream-fair \
                        --add-module=$(MODULESDIR)/ngx_http_substitutions_filter_module \
                        --add-module=$(MODULESDIR)/ngx_pagespeed-release-1.10.33.6-beta</pre>
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<div style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">
If you want to use nginx-light instead of the nginx-full you should add the same line to the light_configure_flags block.</div>
<div style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">
Now we are ready to build Nginx using the following command:</div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo dpkg-buildpackage -b</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="line-height: 26px;"><div>
<span style="font-size: large;">The build process will take a few minutes to complete.</span></div>
<div style="font-size: 15px;">
Once the build process is complete, you will find few .deb files in the <b>/usr/local/src/</b> directory.</div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: black; line-height: normal; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo dpkg-buildpackage -b</span></span></pre>
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</span></span></div>
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<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">nginx_1.8.1-1+trusty0_all.deb
nginx-common_1.8.1-1+trusty0_all.deb
nginx-doc_1.8.1-1+trusty0_all.deb
nginx-extras_1.8.1-1+trusty0_amd64.deb
nginx-extras-dbg_1.8.1-1+trusty0_amd64.deb
nginx-full_1.8.1-1+trusty0_amd64.deb
nginx-full-dbg_1.8.1-1+trusty0_amd64.deb
nginx-light_1.8.1-1+trusty0_amd64.deb
nginx-light-dbg_1.8.1-1+trusty0_amd64.deb</pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">We added the Pagespeed Module to the "full" package, so we will install that package including the nginx-common package:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: 'courier new', courier, monospace; line-height: 15.6px;"><span style="font-size: large;">cd /usr/local/src
sudo dpkg -i nginx-full_1.8.1-1+trusty0_amd64.deb nginx-common_1.8.1-1+trusty0_all.deb</span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px; white-space: normal;">
</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Once the installation is complete, to see what modules are installed run <b>nginx -V</b> .</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">nginx version: nginx/1.8.1
built with OpenSSL 1.0.2g  1 Mar 2016
TLS SNI support enabled
configure arguments:
...
--add-module=/usr/local/src/nginx-1.8.1/debian/modules/ngx_pagespeed-release-1.10.33.6-beta
...</pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Create a directory for the cached files:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: 'courier new', courier, monospace; line-height: 15.6px;"><span style="font-size: large;">sudo mkdir -p /var/ngx_pagespeed_cache
sudo chown -R www-data: /var/ngx_pagespeed_cache</span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px; white-space: normal;">
</span></span></pre>
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<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Create a new nginx configuration for the Pagespeed Module.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace; font-size: large;"><span style="line-height: 15.6px;">sudo nano /etc/nginx/pagespeed.conf</span></span></pre>
</div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">pagespeed on;
pagespeed FileCachePath /var/ngx_pagespeed_cache;

location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" {
  add_header "" "";
}
location ~ "^/pagespeed_static/" { }
location ~ "^/ngx_pagespeed_beacon$" { }

# Minify CSS
# pagespeed EnableFilters combine_css,rewrite_css;

# Minify JS 
# pagespeed EnableFilters combine_javascript,rewrite_javascript;

# Remove comments and whitespace from HTML 
# pagespeed EnableFilters remove_comments,collapse_whitespace; </pre>
</div>
<div>
<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><div>
You can uncomment the filters you need for your website or add a new ones, for more info about Pagespeed filters please check the official <a href="https://developers.google.com/speed/pagespeed/module/config_filters#enabling">PageSpeed </a>documentation.</div>
<div>
In every Nginx server block where you want to enable the PageSpeed Module add:</div>
</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">include /etc/nginx/pagespeed.conf;</pre>
</div>
<div>
<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Example:</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">server {

listen      80;
    server_name your_website;
    root /path/to/website;
 
    include /etc/nginx/pagespeed.conf;
    # omitted code
}</pre>
</div>
<div>
<span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Restart your nginx service and you are ready to go.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: courier new, courier, monospace;"><span style="line-height: 15.6px;"><span style="font-size: large;">sudo nginx -t
sudo service nginx restart</span>
</span></span></pre>
</div>
<div>
<span style="background-color: white; color: #222222; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">That's it. You have successfully installed</span></div>
<div>
<span style="background-color: white; color: #222222; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></span></div>
</div>

How to build nginx with Pagespeed module

Build nginx with Pagespeed module Pagespeed module you can combine and minify CSS and JavaScript, optimize and convert images, remove comments and whitespaces from HTML, and perform many other optimi…

16 Apr 2016

How to install Logaholic on CentOS

<div dir="ltr" style="text-align: left;" trbidi="on">
<h1 class="entry-title" style="background-color: white; box-sizing: border-box; font-family: Lato, sans-serif; line-height: 1.1; margin: 20px 0px 10px;">
<span style="color: #990000; font-size: large;"><u>Install Logaholic on CentOS</u></span></h1>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Logaholic is a Web Analytics provider with solutions for individual websites, hosting providers and agencies. Self hosted or in the cloud, you own the data.</span></span></div>
<div>
<div style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<b><u><span style="color: #0b5394;">Logaholic is 6.0 and it requires:</span></u></b></div>
<div>
<ul style="color: #222222; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px; text-align: left;">
<li><a href="http://www.hackthesec.co.in/search/label/PHP">PHP</a> 5 or higher with cURL and Zip extensions enabled. The output_buffering setting should be disabled and allow_url_fopen and display_errors settings should be enabled in php.ini</li>
<li><a href="http://www.hackthesec.co.in/search/label/Apache">Apache</a> or <a href="http://www.hackthesec.co.in/search/label/NGINX">Nginx</a> Web Server</li>
<li><a href="http://www.hackthesec.co.in/search/label/Mysql">MySQL</a> 5.0 or higher</li>
</ul>
<div style="font-family: verdana, geneva, sans-serif;">
<span style="color: #222222;"><span style="font-size: 15px; line-height: 26px;">Download the latest version of Logaholic available at http://www.logaholic.com/download/ to the server and extract it using the following commands:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">cd /opt/
wget -O logaholic.tar.gz http://www.logaholic.com/download.php?file=logaholic_she_600.tar.gz
tar -xvzf logaholic.tar.gz
</span><span style="color: lime;">mkdir -p /var/www/html/logaholic
</span><span style="color: white;">mv logaholic_she_600/logaholic /var/www/html</span></span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Download GeoLite Legacy Database at http://www.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz , then extract and copy this file to the '<b>/var/www/html/logaholic/components/geoip/</b>' directory on your server:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">wget http://www.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz
</span><span style="color: lime;">gunzip GeoLiteCity.dat.gz
</span><span style="color: white;">mv GeoLiteCity.dat /var/www/html/logaholic/components/geoip/</span></span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Change the file permissions so your web server can write to the '<b>/var/www/html/logaholic</b>' directory and sub directories:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: orange; font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">chown apache:apache -R /var/www/html/logaholic/</span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Edit the Apache configuration file (by default ‘/etc/httpd/conf/httpd.conf’) and define the Apache log file in the following format:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">CustomLog /your_path/access_log "%h %l %u %t \"%r\" %s %b \"%{Referer}i\"
\"%{User-Agent}i\""</span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">In general, this seems to be enough:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">CustomLog /your_path/access_log "</span><span style="color: orange;">combined</span><span style="color: white;">"</span></span></span></pre>
</div>
<div style="font-family: verdana, geneva, sans-serif;">
<span style="color: #222222;"><span style="font-size: 15px; line-height: 26px;"><div>
Please note that each Apache virtual host should have it’s own log file.</div>
<div>
Locate the php configuration file using the following command:</div>
</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">#php -i | grep php.ini
Configuration File (php.ini) Path => /etc
</span><span style="color: orange;">Loaded Configuration File => /etc/php.ini</span></span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Edit the '<b>php.ini</b>' file and add/modify the following lines:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">allow_url_fopen = On 
</span><span style="color: orange;">display_errors = On 
</span><span style="color: lime;">output_buffering = off</span></span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Create a new virtual host directive in Apache. For example, edit your Apache configuration file ('<b>/etc/httpd/conf/httpd.conf</b>' by default) and un-comment the following line:</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">#NameVirtualHost *:80</pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Then, add the following lines at the end:</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><VirtualHost *:80>
ServerAdmin admin@yourdomain.com
DocumentRoot /var/www/html/logaholic/
ServerName yourdomain.com
ServerAlias www.yourdomain.com
<Directory /var/www/html/logaholic/>
    Options FollowSymLinks
    AllowOverride All
</Directory>
    ErrorLog logs/yourdomain.com-error_log
    CustomLog logs/yourdomain.com-access_log combined
</VirtualHost></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Restart the Apache web server for the changes to take effect:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">service </span><span style="color: orange;">httpd </span><span style="color: white;">restart</span></span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Create a new MySQL database for Logaholic on your server:</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">mysql -u root -p
mysql> CREATE DATABASE logaholicdb;
mysql> GRANT ALL PRIVILEGES ON logaholicdb.* TO 'logaholicuser'@'localhost' IDENTIFIED BY 'your-password' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
mysql> quit</pre>
</div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="line-height: 26px;"><div style="font-size: 15px;">
Do not forget to replace 'your-password' with a strong password.</div>
<div style="font-size: 15px;">
Set the MySQL server time zone:</div>
<div>
<pre style="background-color: whitesmoke; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">mysql -u root -p
mysql> SET GLOBAL time_zone = '-06:00';
mysql> FLUSH PRIVILEGES;
mysql> quit</pre>
</div>
</span></span></div>
<div>
<span style="color: #222222; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Populate the time zone tables using the following command:</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: trebuchet ms, sans-serif;"><span style="font-size: 15px; line-height: 15.6px;"><span style="color: white;">mysql_tzinfo_to_sql </span><span style="color: orange;">/usr/share/zoneinfo</span><span style="color: white;"> | mysql -u root mysql</span></span></span></pre>
</div>
<div>
<span style="font-family: verdana, geneva, sans-serif;"><div style="color: #222222; font-size: 15px; line-height: 26px;">
Open http://yourdomain.com/install.php in your popular web browser and follow the easy instructions: enter the database settings and admin login credentials, then click 'Save'. If all settings in ‘Database Settings , 'Mysql Settings' , 'File Access Check' and 'PHP Settings' sections are green, click 'Continue'.</div>
<div style="color: #222222; font-size: 15px; line-height: 26px;">
<br /></div>
<div style="color: #222222; font-size: 15px; line-height: 26px;">
That is it. The Logaholic installation is now complete. Log in to the Admin area at http://yourdomain.com/login.php and click the 'Global Settings' tab for more post-installation tasks like adding a password etc.</div>
<div class="separator" style="clear: both; color: #222222; font-size: 15px; line-height: 26px; text-align: center;">
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<div style="color: #222222; font-size: 15px; line-height: 26px;">
<br /></div>
<div style="text-align: center;">
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #990000;">Install Logaholic using your cPanel account</span></u></b></span></div>
<div class="separator" style="clear: both; text-align: center;">
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<div style="color: #222222; font-size: 15px; line-height: 26px;">
<br /></div>
<div style="color: #222222; font-size: 15px; line-height: 26px;">
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
</span></div>
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</div>

How to install Logaholic on CentOS

Install Logaholic on CentOS Logaholic is a Web Analytics provider with solutions for individual websites, hosting providers and agencies. Self hosted or in the cloud, you own the data. Logaholic is 6…

16 Apr 2016

How to install squid proxy on centos

<div dir="ltr" style="text-align: left;" trbidi="on">
<h1 style="clear: both; font-family: Trebuchet, 'Trebuchet MS', Arial, Verdana, sans-serif; font-size: 30px; height: auto; line-height: 31px; margin: 0px; padding: 0px; width: 614px;">
<u><span style="color: #990000;">Install squid proxy on centos</span></u></h1>
<div>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Squid is a caching and forwarding web proxy. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, <a href="http://www.hackthesec.co.in/search/label/DNS">DNS</a> and other computer network lookups for a group of people sharing network resources; to aiding security by filtering traffic. Although primarily used for HTTP and <a href="http://www.hackthesec.co.in/search/label/ftp">FTP</a>, Squid includes limited support for several other protocols including TLS, SSL, Internet Gopher and HTTPS</span></span><span style="background-color: white; color: #333333; font-family: "verdana" , "geneva" , sans-serif; font-size: 15px; line-height: 26px;">.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtuLbkofJ_zaadojyg-kg2TTym3Z1SblRiTiwNCaRRxvNfwE7UGzMyriv33EkqCKKK-PNDNIrXMTxl633f8uUdiToe_67H4UK77mB5VOLK7hTbxGaSICl3pNA6navN1-2mqAmMYhmcMrOT/s1600/squid_www.hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtuLbkofJ_zaadojyg-kg2TTym3Z1SblRiTiwNCaRRxvNfwE7UGzMyriv33EkqCKKK-PNDNIrXMTxl633f8uUdiToe_67H4UK77mB5VOLK7hTbxGaSICl3pNA6navN1-2mqAmMYhmcMrOT/s1600/squid_www.hackthesec.co.in.png" /></a></div>
<div>
<span style="background-color: white; color: #333333; font-family: "verdana" , "geneva" , sans-serif; font-size: 15px; line-height: 26px;"><br /></span></div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Update yum repositories and packages by typing the below command</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# yum update</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 1:- Install squid package and dependencies using the below command</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# yum install squid</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">By default squid configuration file "<b>/etc/squid/squid.conf</b>" will contains recommended minimum configuration  and squid caching feature will work without making any changes . Recommended minimum configuration will looks like the below</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT

#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128

# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|?) 0     0%      0
refresh_pattern .               0       20%     4320</pre>
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<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 2:- Now start squid service</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# service squid start</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and type this below command to start squid service automatically while booting.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# chkconfig --levels 235 squid on</span></span></pre>
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<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"></span></span><br />
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 3:- Setup your web browser to access Internet through proxy server on port 3128</span></span></div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">
<div>
<br /></div>
<div>
IE : Tools » Internet options »Connections » LAN settings » Choose "Use a proxy server for your LAN" » Type your Proxy server ip (192.168.1.11 ) and port no 3128</div>
<div>
<br /></div>
<div>
Firefox : Options / Preferences » Advanced » Network » Settings » Choose "Manual proxy configuration " » Type your Proxy server ip (192.168.1.11 ) and port no 3128</div>
<div>
<br /></div>
<div>
Step 4:- Browse some sites and check the access log file on proxy server</div>
</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">[root@hackthesec ~]# cat /var/log/squid/access.log
1343759484.645    265 192.168.1.15 TCP_MISS/304 477 GET http://platform.twitter.com/widgets.js - DIRECT/23.64.79.144 application/javascript
1343759484.681    309 192.168.1.15 TCP_MISS/304 839 GET http://apis.google.com/js/plusone.js - DIRECT/173.194.36.36 -
1343759485.005    178 192.168.1.15 TCP_MISS/200 495 GET http://www.google-analytics.com/__utm.gif? - DIRECT/74.125.236.142 image/gif
1343759502.763  20292 192.168.1.15 TCP_MISS/200 1898 CONNECT s-static.ak.facebook.com:443 - DIRECT/23.64.66.110 -
1343759502.765  20292 192.168.1.15 TCP_MISS/200 1898 CONNECT s-static.ak.facebook.com:443 - DIRECT/23.64.66.110 -
1343759723.040 240567 192.168.1.15 TCP_MISS/200 2904 CONNECT plusone.google.com:443 - DIRECT/173.194.36.41 -
1343759934.518    459 192.168.1.15 TCP_MISS/200 495 GET http://www.google-analytics.com/__utm.gif? - DIRECT/173.194.36.8 image/gif
1343759943.131   2186 192.168.1.15 TCP_MISS/200 8343 CONNECT www.facebook.com:443 - DIRECT/66.220.146.94 -
1343759943.266  10616 192.168.1.15 TCP_MISS/200 2790 CONNECT apis.google.com:443 - DIRECT/74.125.236.128 -
1343759943.267  10615 192.168.1.15 TCP_MISS/200 2228 CONNECT ssl.gstatic.com:443 - DIRECT/74.125.236.143 -
1343759950.875   2596 192.168.1.15 TCP_MISS/200 32219 CONNECT www.facebook.com:443 - DIRECT/66.220.146.94 -
1343759961.388  20443 192.168.1.15 TCP_MISS/200 1911 CONNECT s-static.ak.fbcdn.net:443 - DIRECT/23.64.77.177 -</pre>
</div>
<div>
<span style="background-color: white;"></span><br />
<div style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<span style="background-color: white;"><b><u><span style="color: #0b5394;">Troubleshooting :</span></u></b></span></div>
<span style="background-color: white;">
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
If you not able to browse using proxy settings , Disable the firewall ( iptables ) and selinux service on your squid proxy server .</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<b>Disable firewall ( Iptables ) :-</b></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# service iptables stop
[root@hackthesec ~]# chkconfig iptables off</span></span></pre>
</div>
</span></div>
<div>
<span style="background-color: white;"></span><br />
<div>
<span style="background-color: white;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Disable Selinux :- open the file /etc/selinux/config and find the line</span></span></span></div>
<span style="background-color: white;">
</span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">SELINUX=enforcing</span></span></pre>
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<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and replace with</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">SELINUX=disabled</span></span></pre>
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<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">now reboot the server and try step 4.</span></span></div>
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<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"></span></span><br />
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"><b><span style="color: #0b5394;"><u>Configure squid proxy as web filter:</u></span></b></span></span></div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;">
<div style="color: #333333;">
You can restrict user access to particular websites or keywords using access control lists (ACLs) .</div>
<div>
<b><span style="color: #0b5394;"><u>Restricting Access to specific web sites :</u></span></b></div>
<div style="color: #333333;">
For example , we can see how to block facebook.com and gmail.com .</div>
<div style="color: #333333;">
Step 1:- create a file ( <b>/etc/squid/blockedsites.squid</b> ) and add the site names one per line.</div>
</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# cat /etc/squid/blockedsites.squid
#blocked sites
www.facebook.com
www.gmail.com</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 2:- Open the /etc/squid/squid.conf and create a new acl " blocksites" and acl type "dstdomain" in the acl section like the below .</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT
# ACL blocksites 
acl blocksites dstdomain "/etc/squid/blockedsites.squid"</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and add the following line "<b>http_access deny blocksites</b>" to http_section to deny the access to the acl "<b>blocksites</b>" .</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
# Deny access to blocksites ACL
http_access deny blocksites</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 3:- Now restart squid service</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# service squid restart</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 4:- Try to access facebook.com in your browser . you could see the blocked page as below .</span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitsQRp6xcr5AmcJgrWIHEyVE274ObQfkcEWpNTBGqT_25fkxX_ryBbASwHU-G3Iwsye8ZiK2CDfkIEo6AU3h-ZmCZtF4of10Dt34mqj-ryTojXljt7XEsIrjcl-LADcICkQ61A8Yl4cXKE/s1600/squid_proxy_server_block_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitsQRp6xcr5AmcJgrWIHEyVE274ObQfkcEWpNTBGqT_25fkxX_ryBbASwHU-G3Iwsye8ZiK2CDfkIEo6AU3h-ZmCZtF4of10Dt34mqj-ryTojXljt7XEsIrjcl-LADcICkQ61A8Yl4cXKE/s1600/squid_proxy_server_block_www.hackthesec.co.in.jpg" /></a></div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><br /></span></span></div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and check the log file you can see the facebook request is denied .</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"> [root@hackthesec ~]# tail -f /var/log/squid/access.log
.................................................................................
1343820985.542      1 192.168.1.15 TCP_DENIED/403 4255 GET http://www.facebook.com/ - NONE/- text/html
1343820986.998   1411 192.168.1.15 TCP_MISS/200 13152 GET http://www.squid-cache.org/Artwork/SN.png - DIRECT/198.186.193.234 image/png
1343820987.004      0 192.168.1.15 TCP_DENIED/403 4178 GET http://www.facebook.com/favicon.ico - NONE/- text/html</pre>
</div>
<div>
<span style="background-color: white;"></span><br />
<div style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<span style="background-color: white;"><b><u><span style="color: #0b5394;">Restricting Access to specific keywords :</span></u></b></span></div>
<span style="background-color: white;">
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Step 1:- create a file (<b> /etc/squid/blockkeywords.squid</b> ) and add the keywords one per line.</div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# cat /etc/squid/blockkeywords.squid
#blocked keywords
sex
porn
xxx</span></span></pre>
</div>
</span></div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 2:- Open the <b>/etc/squid/squid.conf</b> and create a new acl "blockkeywords" and acl type "url_regex" in the acl section</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT
# ACL blocksites 
acl blocksites dstdomain "/etc/squid/blockedsites.squid"
# ACL blockkeywords
acl blockkeywords url_regex -i "/etc/squid/blockkeywords.squid"</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and add the following line "http_access deny blockkeywords" to http_section to deny the access to the acl "<b>blockkeywords</b>" .</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
# Deny access to blocksites ACL
http_access deny blocksites
# Deny access to blockkeywords ACL
http_access deny blockkeywords</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"></span></span><br />
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"><b><span style="color: #0b5394;"><u>Restricting Access to specific Ipaddress :</u></span></b></span></span></div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;">
<div style="color: #333333;">
Step 1:- create a file ( /etc/squid/blockip.squid ) and add the ip adresses one per line.</div>
</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# cat /etc/squid/blockip.squid
#blocked ips
192.168.1.20
192.168.1.21</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 2:- Open the /etc/squid/squid.conf and create a new acl "blockip" and acl type "src" in the acl section</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT
# ACL blocksites 
acl blocksites dstdomain "/etc/squid/blockedsites.squid"
# ACL blockkeywords
acl blockkeywords url_regex -i "/etc/squid/blockkeywords.squid"
# ACL blockip
acl blockip src "/etc/squid/blockip.squid"</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and add the following line "http_access deny blockip" to http_section to deny the access to the acl "blockip" .</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
# Deny access to blockip ACL
http_access deny blockip
# Deny access to blocksites ACL
http_access deny blocksites
# Deny access to blockkeywords ACL
http_access deny blockkeywords</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"></span></span><br />
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"><b><u><span style="color: #0b5394;">Allow Full access to specific Ipaddress :</span></u></b></span></span></div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;">
<div style="color: #333333;">
You can allow specific ip address to gain full access without blocking sites and keywords . just create a file "/etc/squid/allowip.squid" and add the ip address one per line and create an acl "allowip"  and acl type "src" in the acl section</div>
</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># ACL allowip
acl allowip src "/etc/squid/allowip.squid"</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and add the "allowip" in the http_access as below</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
# Deny access to blockip ACL
http_access deny blockip
# Deny access to blocksites ACL
http_access deny blocksites !allowip
# Deny access to blockkeywords ACL
http_access deny blockkeywords !allowip</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"></span></span><br />
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;"><b><u><span style="color: #0b5394;">Changing squid proxy port number:</span></u></b></span></span></div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="font-family: "verdana" , "geneva" , sans-serif;">
<div style="color: #333333;">
You can change squid proxy port number , by default it uses 3128 port .</div>
<div style="color: #333333;">
Just find the below line in "/etc/squid/squid.conf"</div>
</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">http_port 3128</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and replace with</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">http_port 8000 # whatever port number you want</span></span></pre>
</div>
<div>
<span style="background-color: white;"></span><br />
<div style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<span style="background-color: white;"><b><u><span style="color: #0b5394;">Restricting Download size :</span></u></b></span></div>
<span style="background-color: white;">
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
You can restrict download file size  using reply_body_max_size .</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Add the below line at the bottom of the http_access section</div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">#Restrict download size
reply_body_max_size 10 MB all</span></span></pre>
</div>
</span></div>
<div>
<span style="background-color: white; color: #333333; font-family: "verdana" , "geneva" , sans-serif; font-size: 15px; line-height: 26px;">or</span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">#Restrict download size
reply_body_max_size 10 MB !allowip</span></span></pre>
</div>
<div>
<span style="background-color: white;"></span><br />
<div style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<span style="background-color: white;"><b><u><span style="color: #0b5394;">Configuring Squid as Transparent Proxy :</span></u></b></span></div>
<span style="background-color: white;">
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
You can configure squid as transparent proxy .</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Step 1:- just find the below line</div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;"># Squid normally listens to port 3128
http_port 3128</span></span></pre>
</div>
</span></div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and replace with</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;"># Squid normally listens to port 3128
http_port 3128 intercept</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 2:- Create a file "/root/squidfw.sh" and add the following firewall script ( modify as per your interface configuration ).</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">#!/bin/sh
# squid server IP
SQUID_SERVER="192.168.1.11"
# Interface connected to Internet
INTERNET="eth0"
# Interface connected to LAN
LAN_IN="eth1"
# Squid port
SQUID_PORT="3128"
# DO NOT MODIFY BELOW
# Clean old firewall
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
# Load IPTABLES modules for NAT and IP conntrack support
modprobe ip_conntrack
modprobe ip_conntrack_ftp
# For win xp ftp client
#modprobe ip_nat_ftp
echo 1 > /proc/sys/net/ipv4/ip_forward
# Setting default filter policy
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
# Unlimited access to loop back
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
# Allow UDP, DNS and Passive FTP
iptables -A INPUT -i $INTERNET -m state --state ESTABLISHED,RELATED -j ACCEPT
# set this system as a router for Rest of LAN
iptables --table nat --append POSTROUTING --out-interface $INTERNET -j MASQUERADE
iptables --append FORWARD --in-interface $LAN_IN -j ACCEPT
# unlimited access to LAN
iptables -A INPUT -i $LAN_IN -j ACCEPT
iptables -A OUTPUT -o $LAN_IN -j ACCEPT
# DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy
iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j DNAT --to $SQUID_SERVER:$SQUID_PORT
# if it is same system
iptables -t nat -A PREROUTING -i $INTERNET -p tcp --dport 80 -j REDIRECT --to-port $SQUID_PORT
# DROP everything and Log it
iptables -A INPUT -j LOG
iptables -A INPUT -j DROP</pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 3:- just run the script</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">[root@hackthesec ~]# sh /root/squidfw.sh</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">and add the below line to "/etc/rc.local" to run the script during startup</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;">sh /root/squidfw.sh</span></span></pre>
</div>
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"></span></span><br />
<div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">Step 4 (Updated):- Change default gateway ip to squid server ip on the user machines </span></span></div>
<span style="background-color: white; font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;">
<div>
Now users can access Internet without setting proxy in the browser settings.</div>
</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-size: medium;"><span style="line-height: 20.8px;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></span></span></pre>
</div>
</div>

How to install squid proxy on centos

Install squid proxy on centos Squid is a caching and forwarding web proxy. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, DNS and other com…

07 Apr 2016

How to Setup Linux Crontab

<div dir="ltr" style="text-align: left;" trbidi="on">
<h2 class="title single-title title20" style="background-color: white; border: 0px; font-family: 'Open Sans'; font-size: 24px; line-height: 30px; margin: 0px 0px 5px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
<u><span style="color: #990000;">Setup Linux Crontab with Examples</span></u></h2>
<div>
<br /></div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">The crontab is a list of commands that you want to run on a regular schedule, and also the name of the command used to manage that list.crontab stands for "cron table," because it uses the job scheduler cron to execute tasks; cron itself is named after "chronos," the Greek word for time.</span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNxZSQDaB6oQGUvfrc2n9qEG3fLbPBM41BCQOkmx5_B9rqrLYEelIyUAsxttK_RxPGVaeiKA6v3yzvDTMPBGaN4dxbxfPmiTjYTvI3ZB4ZBKhBiKukzPGIkIiug0NkRN3p-spCoFo52wFt/s1600/cron_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNxZSQDaB6oQGUvfrc2n9qEG3fLbPBM41BCQOkmx5_B9rqrLYEelIyUAsxttK_RxPGVaeiKA6v3yzvDTMPBGaN4dxbxfPmiTjYTvI3ZB4ZBKhBiKukzPGIkIiug0NkRN3p-spCoFo52wFt/s1600/cron_www.hackthesec.co.in.jpg" /></a></div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span></div>
<div>
<h2 class="post-heading" style="background-color: white; border: 0px; font-family: sans-serif; line-height: 30px; margin: 30px 0px 15px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
<span style="color: #0b5394; font-size: large;"><u>Important command related to crontab.</u></span></h2>
</div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To see what cron jobs are currently running on your system.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">crontab -l</span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To configure new or edit currently running crontab.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">crontab -e</span></span><span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px; white-space: normal;">
</span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">and below command will give prompt before deleting user’s crontanb.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">cronttab -r -i</span></span></pre>
</div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To remove or delete currently running crontab.</span></span></div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">crontab -r</span></span><span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px; white-space: normal;">
</span></span></pre>
</div>
<div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To setup crontab for a specific user.</span></span></div>
<div>
<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">For example you as root user want to setup cron job for a user called hackthesec.</span></span></div>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To access users crontab we will use following command.</span></span><br />
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">crontab -u hackthesec -e</span></span></pre>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To view other users currently running crontabs.</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">crontab -u hackthesec -l</span></span></pre>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To view other users currently running crontabs.</span></span></div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: "trebuchet ms" , sans-serif;"><span style="font-size: 15px; line-height: 15.6px;">crontab -u hackthesec -r</span></span></pre>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">In order to setup or edit a cron job, we need to understand the contab format first:</span></span></div>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">It consists on 6 parts, see below explanation.</span></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVcmmwCmezawzY9jFfdWqDHihfnD_IQigBtaRzqmjmWx3l9flfUchWHw62cHZY6aEtgNQFmoGpYfHccHCJnywXkC4LJgqEUYl1gvLRaKRhUlSKDVXFTtIOjY9x7W-jTXuCz5kPwmSPsJyb/s1600/linux-crontab-explanation_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVcmmwCmezawzY9jFfdWqDHihfnD_IQigBtaRzqmjmWx3l9flfUchWHw62cHZY6aEtgNQFmoGpYfHccHCJnywXkC4LJgqEUYl1gvLRaKRhUlSKDVXFTtIOjY9x7W-jTXuCz5kPwmSPsJyb/s1600/linux-crontab-explanation_www.hackthesec.co.in.jpg" /></a></div>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span></div>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Now, to keep above format in mind let us see some practical examples of crontab job scheduling.</span></span></div>
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<span style="color: #0b5394; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Schedule cron job for specific time.</u></b></span></span></div>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Below command will execute a shell script called delete_temp_Files.sh on 29th February at 03:30 AM. Will use short code to remember crontab format.</span></span></div>
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<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">#M  H  DOM M  DOW Cmd
 30 03 29  02 *   /bin/bash /scripts/delete_temp_files.sh</pre>
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<span style="background-color: white; line-height: 19.84px;"><span style="color: red; font-family: "arial" , sans-serif;">Note: As mentioned in above example corntab uses 24 hours format, so, for 3 AM use 3, and for 3 PM use 15.</span></span></div>
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<span style="background-color: white; line-height: 19.84px;"><span style="color: #0b5394; font-family: "arial" , sans-serif; font-size: large;"><b><u>Schedule cron job to run Every minute.</u></b></span></span></div>
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<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">#M  H DOM M DOW Cmd
 *  * *   * *   /bin/bash /scripts/delete_temp_files.sh</pre>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Asterisks represents all, so above example will run mentioned command:</span></span></div>
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<span style="color: #222222; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">every minute.</span></span></div>
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<span style="font-family: "verdana" , "geneva" , sans-serif;"></span><br />
<div style="color: #222222; font-size: 15px; line-height: 26px;">
<span style="font-family: "verdana" , "geneva" , sans-serif;">of every hour</span></div>
<span style="font-family: "verdana" , "geneva" , sans-serif;">
<div style="color: #222222; font-size: 15px; line-height: 26px;">
of every day of the month</div>
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of every day of the week.</div>
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<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #0b5394;">Schedule a job to run Every 5 minute.</span></u></b></span></div>
</span></div>
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<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">#M    H   DOM  M   DOW   Cmd
 */5  *   *    *   *     /bin/bash /scripts/delete_temp_files.sh</pre>
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<div style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<b><u><span style="color: #0b5394;">Execute a cron job Every 1 hour.</span></u></b></div>
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<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">#M    H    DOM  M   DOW   Cmd
 0    *    *    *   *     /bin/bash /scripts/delete_temp_files.sh</pre>
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<span style="color: #0b5394; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Execute a cron job every 5 hour.</u></b></span></span></div>
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<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">#M    H    DOM  M   DOW   Cmd
 0    */5  *    *   *     /bin/bash /scripts/delete_temp_files.sh</pre>
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<span style="background-color: white; line-height: 19.84px;"><span style="color: #0b5394; font-family: "arial" , sans-serif; font-size: large;"><b><u>Schedule a cron job using Special tags.</u></b></span></span></div>
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<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">@hourly   Run once an hour
@daily   Run once a day
@weekly   Run once a week
@montly   Run once a month
@yearly   Run once a year
@reboot   Run once, at startup</pre>
<pre style="background-color: #f4f4f4; border: 1px solid rgb(229, 229, 229); color: #555555; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></pre>
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How to Setup Linux Crontab

Setup Linux Crontab with Examples The crontab is a list of commands that you want to run on a regular schedule, and also the name of the command used to manage that list.crontab stands for "cron tabl…

28 Mar 2016

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