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How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #990000; font-family: verdana, geneva, sans-serif; font-size: large; line-height: 26px;"><b><u>Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7</u></b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Icinga is an open source computer system and network monitoring application. It was originally created as a fork of the Nagios system monitoring application in 2009.</span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtbWp0y0o_B3MQiZ4bjwJQ4f43t1N5Cu4j8oHUv4wcD_bkuIBuA-wAMchSWbUMTNe1SgmJUhspgJq0dsb2kp8QLI4CnMkGSp9dFA6V4R4yYEg7gWQd3NeqgPOiQ_25aaQsXopeXhALg_wf/s1600/icinga_logo.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtbWp0y0o_B3MQiZ4bjwJQ4f43t1N5Cu4j8oHUv4wcD_bkuIBuA-wAMchSWbUMTNe1SgmJUhspgJq0dsb2kp8QLI4CnMkGSp9dFA6V4R4yYEg7gWQd3NeqgPOiQ_25aaQsXopeXhALg_wf/s1600/icinga_logo.png" /></a></div>
<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;">Icinga is attempting to get past perceived short-comings in Nagios' development process, as well as adding new features such as a modern Web 2.0 style user interface, additional database connectors (for MySQL, Oracle, and PostgreSQL), and a REST API that lets administrators integrate numerous extensions without complicated modification of the Icinga core.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Before we go ahead, lets install the required packages for Icinga.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># yum -y install wget httpd mod_ssl gd gd-devel mariadb-server php-mysql php-xmlrpc gcc mariadb libdbi libdbi-devel libdbi-drivers libdbi-dbd-mysql</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Disable SELinux.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Reboot once done.</span></span><br />
<span style="font-size: 15px; line-height: 26px;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; 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;">Create icinga user and<b> icinga-cmd</b> group (allowing the external commands to be executed through the web interface) , <b>add  icinga and apache user to the part of icinga-cmd group.</b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># useradd icinga
# groupadd icinga-cmd
# usermod -a -G icinga-cmd icinga
# usermod -a -G icinga-cmd apache</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Download latest Icinga source tarball.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># cd /tmp/
# wget http://downloads.sourceforge.net/project/icinga/icinga/1.10.1/icinga-1.10.1.tar.gz
# tar -zxvf /tmp/icinga-1.10.1.tar.gz
# cd /tmp/icinga-1.10.1</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Compile and Install Icinga:</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># ./configure --with-command-group=icinga-cmd --enable-idoutils
# make all
# make install
# make install-init
# make install-config
# make install-commandmode
# make install-webconf
# make install-idoutils</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Configure Icinga:</u></b></span></span><br />
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></u></b></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Sample configuration files have now been installed in the <b>/usr/local/icinga/etc/</b> directory. These sample files should work fine for getting started with Icinga. You’ll need to make just one change before you proceed. Edit the <b>/usr/local/icinga/etc/objects/contacts.cfg</b> config file with your favorite editor and change the email address associated with the nagiosadmin contact definition to the address you’d like to use for receiving alerts.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># vi /usr/local/icinga/etc/objects/contacts.cfg</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Change the Email address field to receive the notification.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">email                           icinga@localhost</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">to</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">email                           icinga@hackthesec.co.in</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Move sample idoutils configuration files to Icinga base directory.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># cd /usr/local/icinga/etc/
# mv idomod.cfg-sample idomod.cfg
# mv ido2db.cfg-sample ido2db.cfg
# cd modules/
# mv idoutils.cfg-sample idoutils.cfg</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Create database for idoutils:</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: menlo, monaco, consolas, courier new, monospace;"><span style="line-height: 25.7143px;"># systemctl start mariadb.service
# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE icinga;
MariaDB [(none)]> GRANT USAGE ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'icinga' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0;
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> quit</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Import Database.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># mysql -u root -p icinga < /tmp/icinga 1.10.1/module/idoutils/db/mysql/mysql.sql</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Configure Web Interface:</u></b></span></span><br />
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></u></b></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Create a icingaadmin account for logging into the Icinga web interface. Remember the password that you assign to this user – you’ll need it later.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># htpasswd -c /usr/local/icinga/etc/htpasswd.users icingaadmin</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Restart Apache to make the new settings take effect.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">systemctl restart httpd.service</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Download and Install Nagios Plugins:</u></b></span></span><br />
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></u></b></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Download Nagios Plugins to /tmp directory.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># cd /tmp
# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
# tar -zxvf /tmp/nagios-plugins-2.0.3.tar.gz
# cd /tmp/nagios-plugins-2.0.3/</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Compile and install the plugins.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># ./configure --prefix=/usr/local/icinga --with-cgiurl=/icinga/cgi-bin --with-nagios-user=icinga --with-nagios-group=icinga
# make
# make install</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Starting Icinga:</u></b></span></span><br />
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></u></b></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Verify the sample Icinga configuration files.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># /usr/local/icinga/bin/icinga -v /usr/local/icinga/etc/icinga.cfg</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">If there are no errors, start Nagios and Idoutils.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># /etc/init.d/icinga start
# /etc/init.d/ido2db start</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">Start Icinga and Idoutils on system startup.</span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># chkconfig ido2db on
# chkconfig icinga on
# systemctl enable httpd.service
# systemctl enable mariadb.service</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Access Web Interface:</u></b></span></span><br />
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;"></span></u></b></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Now access Icinga web interface using the following URL. You'll be prompted for the username (icingaadmin) and password you specified earlier.</span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0PhYekAkOCAtvydkM0jNq7qOMIsvmjx1BVH4fv3VrMj0xK6rFZdrRYxsruVzHDPwBkLcMhEfT31yBN69Tgc7PF5RneGSkbmtrKT50LUfahzo-_gxItZknEjr3zf_2fZwnTLeNGKe-fwNA/s1600/CentOS-7-Icinga-localhost-Service-details_hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0PhYekAkOCAtvydkM0jNq7qOMIsvmjx1BVH4fv3VrMj0xK6rFZdrRYxsruVzHDPwBkLcMhEfT31yBN69Tgc7PF5RneGSkbmtrKT50LUfahzo-_gxItZknEjr3zf_2fZwnTLeNGKe-fwNA/s1600/CentOS-7-Icinga-localhost-Service-details_hackthesec.co.in.jpg" /></a></div>
<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;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span>
<br /></div>

How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 Icinga is an open source computer system and network monitoring application. It was orig...

How to Send Email from Node.js

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<h1 class="title single-title title20" style="-webkit-text-stroke-width: 0px; background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 28px; font-style: normal; font-variant: normal; font-weight: 700; letter-spacing: normal; line-height: 38px; margin: 0px 0px 5px; opacity: 1; orphans: auto; outline: 0px; padding: 0px; text-align: center; text-indent: 0px; text-transform: none; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible; white-space: normal; widows: 1; word-spacing: 0px;">
<u><span style="color: #990000;">Send Email from Node.js</span></u></h1>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Although <a href="http://www.hackthesec.co.in/search/label/Node.Js">Node.js</a> is not a JavaScript framework, many of its basic modules are written in JavaScript, and developers can write new modules in JavaScript. The runtime environment interprets JavaScript using Google's V8 JavaScript engine.</span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgS_d84hKw7Wbrd45feCZJfc5UzuZmMrKqYVaPQH4-eIyKaI03TQLhnTqrXKqI_29dGvp0lXdCdm-LzYjOLtOJYCam5NGABC8pKYMceCtBB1Ok5xvlkqtjylZXFrpaz78DavDHgahrHBuc0/s1600/sending-email-with-node-js-gmail-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/AVvXsEgS_d84hKw7Wbrd45feCZJfc5UzuZmMrKqYVaPQH4-eIyKaI03TQLhnTqrXKqI_29dGvp0lXdCdm-LzYjOLtOJYCam5NGABC8pKYMceCtBB1Ok5xvlkqtjylZXFrpaz78DavDHgahrHBuc0/s1600/sending-email-with-node-js-gmail-www.hackthesec.co.in.jpg" /></a></div>
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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></div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">First you need to install nodemailer package in your application. Use following command to install this package.</span></span></div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: monaco, courier new, dejavu sans mono, bitstream vera sans mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">$ npm install nodemailer</span></span></pre>
</div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Now add following code in your application to send email. Make sure to update all required values in below code to send email successfully.</span></span></div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: menlo, monaco, consolas, courier new, monospace;"><span style="line-height: 25.7143px;">var nodemailer = require('nodemailer');

var mailTransport = nodemailer.createTransport('smtps://user%40gmail.com:email_password@smtp.gmail.com');

var mailOptions = {
   from: "Sender Name <sender@example.com>",
   to: "Recipient Name <recipient@example.com>",
   subject: "Hello World",
   text: "Test email with node.js"
   html: '<b>Test email with node.js</b>'
};

mailTransport.sendMail(mailOptions, function(error, info){
    if(error){
        return console.log(error);
    }
    console.log('Message sent: ' + info.response);
});</span></span><span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px; white-space: normal;">
</span></span></pre>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">If you are still facing any issue with sending email through Gmail stmp servers make sure you are using correct login details. For 2 factor authentication enabled account required to generate application specific password and set here. Also you allow <a href="https://www.google.com/settings/security/lesssecureapps" target="_blank">less secure apps</a> in your Gmail account.</span></span></div>
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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></div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></span></span></div>
</div>
</div>

How to Send Email from Node.js

Send Email from Node.js Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Alth...

Allow/deny,disable or drop/block ping packets on Linux serves

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<span style="color: #990000; font-family: "verdana" , "geneva" , sans-serif; font-size: large;"><span style="line-height: 26px;"><b><u>Allow/deny,disable or drop/block ping request</u></b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network, and to measure the round-trip time for messages sent from the originating host to a destination computer and echoed back to the source. </span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMkvanWwL3sQ5vslmP9RJn-wN23GzG7XOupgaiHDMQJzpuqMvvq8LlJAZ6Q0fGyREUOXoCHIEyBnFXFWJFq0YlnOGnfGnZmTFBoPHoDn4etpw8Fi6u-G95vqTG-_KDlTEvCd2xtpZxzRHE/s1600/security.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMkvanWwL3sQ5vslmP9RJn-wN23GzG7XOupgaiHDMQJzpuqMvvq8LlJAZ6Q0fGyREUOXoCHIEyBnFXFWJFq0YlnOGnfGnZmTFBoPHoDn4etpw8Fi6u-G95vqTG-_KDlTEvCd2xtpZxzRHE/s1600/security.jpg" /></a></div>
<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;">The name comes from active sonar terminology that sends a pulse of sound and listens for the echo to detect objects under water,although it is sometimes interpreted as a backronym to packet Internet groper</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Blocking PING on server is helpful sometimes, if the server is continue to face any type of DDoS attack by using the PING feature. By using <a href="http://www.hackthesec.co.in/search/label/Iptables" target="_blank">iptables </a>we can simply stop the PING option.</span></span><br />
<span style="color: #0b5394; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>STEP : 1</u></b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">You can setup kernel variable to drop all ping packets. Type the following command at shell prompt:</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">This instructs the kernel to simply ignore all ping requests.</span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">To enable ping request type the command:</span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all</span></span></pre>
<span style="font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #333333;">You can add following line to</span><b><span style="color: #990000;"> /etc/sysctl.conf</span></b><span style="color: #333333;"> file:</span></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"># vi /etc/sysctl.conf </span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Append following line:</span></span><br />
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: "menlo" , "monaco" , "consolas" , "courier new" , monospace; font-size: medium;"><span style="line-height: 25.7143px;">net.ipv4.icmp_echo_ignore_all = 1</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Save and close the file.</span></span><br />
<span style="color: #0b5394; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>STEP : 2</u></b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Also we can manage it by the help of '<a href="http://www.hackthesec.co.in/search/label/Iptables" target="_blank">iptables</a>'. The 'ping' is using ICMP to communicate. We can simply manage the 'icmp : Internet Controlled Message Protocol'from iptables.</span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">The below pasted switches are required for creating a rule for managing icmp.</span></span><br />
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: "menlo" , "monaco" , "consolas" , "courier new" , monospace; font-size: medium;"><span style="line-height: 25.7143px;">-A : Add a rule
-D : Delete rule from table
-p : To specify protocol (here 'icmp')
--icmp-type : For specifying type
-J : Jump to target</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Normally using icmp types and its Codes Click here for ICMP Types and Codes</span></span><br />
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: "menlo" , "monaco" , "consolas" , "courier new" , monospace; font-size: medium;"><span style="line-height: 25.7143px;">echo-request   :  8
echo-reply     :  0</span><span style="line-height: 25.7143px; white-space: normal;">
</span></span></pre>
<div>
<span style="color: #0b5394; font-family: "menlo" , "monaco" , "consolas" , "courier new" , monospace; font-size: medium;"><span style="line-height: 25.7143px;"><b><u>How to block PING to your server with an error message?</u></b></span></span></div>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">In this way you can partially block the PING with an error message 'Destination Port Unreachable'. Add the following iptables rules to block the PING with an error message. (Use REJECT as Jump to target)</span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">iptables -A INPUT -p icmp --icmp-type echo-request -j REJECT</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Result : - </span></span><br />
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: "menlo" , "monaco" , "consolas" , "courier new" , monospace; font-size: medium;"><span style="line-height: 25.7143px;">[root@redhat ~]# ping hackthesec.co.in
Pinging hackthesec.co.in [216.239.34.21] with 32 bytes of data:
From 216.239.34.2 icmp_seq=1 Destination Port Unreachable
From 216.239.34.2 icmp_seq=2 Destination Port Unreachable
From 216.239.34.2 icmp_seq=3 Destination Port Unreachable</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b>To block without any messages use DROP as Jump to target.</b></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">iptables -A INPUT -p icmp --icmp-type echo-request -j DROP
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j DROP</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b>Allow Ping from Outside to Inside</b></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT</span></span></pre>
<span style="color: #0b5394; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>How to block PING from your server?</u></b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">In this way you can block PING option from your server to outside. Add these rules to your iptables to do the same.</span></span><br />
<br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Block PING operation with message 'Operation not permitted'</span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">Result:-</span></span><br />
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"><span style="color: #333333; font-family: "menlo" , "monaco" , "consolas" , "courier new" , monospace; font-size: medium;"><span style="line-height: 25.7143px;">root@test [~]# ping google.com
PING google.com (173.194.34.136) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>To block with out any error messages</u></b></span></span><br />
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">For this, DROP the echo-reply to the INPUT chain of your iptables.</span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP
iptables -A INPUT -p icmp --icmp-type echo-reply -j DROP</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Allow Ping from Inside to Outside</u></b></span></span><br />
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: "monaco" , "courier new" , "dejavu sans mono" , "bitstream vera sans mono" , monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT</span></span></pre>
<span style="color: #333333; font-family: "verdana" , "geneva" , sans-serif;"><span style="font-size: 15px; line-height: 26px;">You can use the icmp code instead of icmp-type name for adding rule to iptables.</span></span><br />
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Allow/deny,disable or drop/block ping packets on Linux serves

Allow/deny,disable or drop/block ping request Ping is a computer network administration software utility used to test the reachability of ...

How to Install R on Ubuntu 15.10

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<h1 style="box-sizing: border-box; font-family: Raleway, Helvetica, Arial, sans-serif; line-height: 46px; margin: 0px 0px 8px;">
<span style="color: #990000; font-size: large;"><u>Installing R on Ubuntu 15.10</u></span></h1>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv3s0gpPWiNS8sFiRQ0ilWI4cw7L07aMuNvPNzkZ_LudF-Z8vjj8CX2Von03FAtVgIJrMn9bjN70f7g-ubG96yRnQkio1HM4ep-FsoSEJdWw_IG25yOlyxAt-lhYhho3J6fsnsyXZx6MzT/s1600/Rlogo_hackthesec.co.in.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv3s0gpPWiNS8sFiRQ0ilWI4cw7L07aMuNvPNzkZ_LudF-Z8vjj8CX2Von03FAtVgIJrMn9bjN70f7g-ubG96yRnQkio1HM4ep-FsoSEJdWw_IG25yOlyxAt-lhYhho3J6fsnsyXZx6MzT/s1600/Rlogo_hackthesec.co.in.png" /></a><span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">R is a programming language and software environment for statistical computing and graphics supported by the R Foundation for Statistical Computing.The R language is widely used among statisticians and data miners for developing statistical software and data analysis Polls, surveys of data miners, and studies of scholarly literature databases show that R's popularity has increased substantially in recent years.</span></span></div>
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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></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">R is an implementation of the S programming language combined with lexical scoping semantics inspired by Scheme.S was created by John Chambers while at Bell Labs. There are some important differences, but much of the code written for S runs unaltered.</span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9junrIIkb8EY0_mU_WR180LPDYuEMASRIbxl7US5fRknWKQCS7TIA4N6-4mXkC3Wbwsw3VEOF6yNJbzuL6e_KQvg_1x04PG-EgCR7qP4iPsIF3PEnbr2Ves_CNYht6L9oIXkf_nDuo6ER/s1600/why-learn-r_hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9junrIIkb8EY0_mU_WR180LPDYuEMASRIbxl7US5fRknWKQCS7TIA4N6-4mXkC3Wbwsw3VEOF6yNJbzuL6e_KQvg_1x04PG-EgCR7qP4iPsIF3PEnbr2Ves_CNYht6L9oIXkf_nDuo6ER/s1600/why-learn-r_hackthesec.co.in.jpg" /></a></div>
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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></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>Installing R Programming Language</u></b></span></span></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">You can install R by executing:</span></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">apt-get -y install r-base</span></span></pre>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Try running the command 'R' (capital letter).</span></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">R version 3.2.2 (2015-08-14) -- "Fire Safety"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.</span></span></pre>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Quit:</span></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;"> </span></span><span style="background-color: transparent; font-size: 15px; line-height: 19px; white-space: pre-wrap;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;">q(save = "no")</span></span></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>Installing packages</u></b></span></span></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">R packages are packages that extend the capabilities of R. Enter R:</span></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">R</span></span></pre>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">There are two ways to install R packages. First of all, if you want to install a package only for the current user, you can execute the following in R:</span></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">install.packages("name")</span></span></pre>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">If you want to install a package available for all users on the system, there are multiple mirrors for both R and its packages. Execute:</span></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">su - -c "R -e \"install.packages('name', repos = 'http://cran.rstudio.com/')\""</span></span></pre>
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<span style="font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #333333;">Replace </span><b><span style="color: red;">name</span></b><span style="color: #333333;"> with the package name.</span></span></span></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><div>
<b>Please note: </b>that you do not want to install R with packages on a server with less than 1 GB RAM.</div>
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For further learning, please visit the <a href="http://www.r-project.org/" target="_blank">R website.</a></div>
</span></span></div>
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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></div>
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How to Install R on Ubuntu 15.10

Installing R on Ubuntu 15.10 R is a programming language and software environment for statistical computing and graphics supported by t...

How to Delete Files Older than X Number of Days in Linux

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<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;">Delete Files Older than X Number of Days in Linux</span></u></h2>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">How to keep limited amount of backup files or how to delete backup files or any file than older then x number of Days.</span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1XyDsm5bthyO-_-OqpH89oK8Sw-efgEPeY_inf32JcMAXIYo2vTx-PBhzPdnMbUz0aJXJSiqDm9USNl0cM4lj24WhhGm858N8_Wl43zO7AKVMzSdgXeLDYmhRyHQraYf_12AoDqRPhk4Z/s1600/delete_x_number_files_hackthesec.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1XyDsm5bthyO-_-OqpH89oK8Sw-efgEPeY_inf32JcMAXIYo2vTx-PBhzPdnMbUz0aJXJSiqDm9USNl0cM4lj24WhhGm858N8_Wl43zO7AKVMzSdgXeLDYmhRyHQraYf_12AoDqRPhk4Z/s1600/delete_x_number_files_hackthesec.jpg" /></a></div>
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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></div>
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<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Using find utility we can easily figure out files older than x number of days and then use the rm command to delete them.</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Here is combination of find and rm command to find and delete older files using some interesting arguments.</div>
<div style="font-family: verdana, geneva, sans-serif;">
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #0b5394;">Find All Files Inside Directory and Delete Files which is Older Than 10 Days</span></u></b></span></div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">find /location/to/find/files/* -mtime +10 -exec rm {} \;</span></span></pre>
</div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Command Explanation:</u></b></span></span></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u><br /></u></b></span></span></div>
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<span style="font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><span style="color: #333333;">1) </span><span style="color: red;">find /location/to/find/files/*</span></b></span></span></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">=This command use to find files in Linux operating system. Next part of this command is /locatin/to/find/files/ which means find files inside this directory suppose I have directory on root named backup so my command will be "find /backup/*".</span></span></div>
</div>
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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></div>
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<span style="font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><div>
<b><span style="color: #333333;">2) </span><span style="color: red;">mtime +10</span></b></div>
<div style="color: #333333;">
=The next argument -mtime, is used to specify the number of days. In our example we uses -mtime +10 so it will find files older than 10 days.</div>
</span></span></div>
<div>
<div>
<span style="font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><span style="color: #333333;">3) </span><span style="color: red;">-exec rm {} \;</span></b></span></span></div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">=The last argument contains two parts, "-exec" allows you to pass an other command such as rm, and the second part "{} \; " is required to end the command.</span></span></div>
</div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span></div>
<div>
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Delete Files which is Older Than 5 Days With .tar File Extension.</u></b></span></span></div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">find /backup -name "*.tar" -type f -mtime +5 -exec rm -fr {} \;</span></span></pre>
</div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b>Very Important:</b> Be VERY careful to supply an absolute path while using "rm" commands!</span></span></div>
<div>
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Find and Delete Files using Find Command.</u></b></span></span></div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Same task you can perform using find command only. See below example:</span></span></div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace;"><span style="font-size: 15px; line-height: 19px; white-space: pre-wrap;">find /location/to/find/files/* -mtime +10 -type f -delete</span></span></pre>
</div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Tip:- you can add this command in bash script and automate this process using <a href="http://www.hackthesec.co.in/2016/03/how-to-setup-linux-crontab.html" target="_blank">cron job utility</a>.</span></span></div>
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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></div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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</div>

How to Delete Files Older than X Number of Days in Linux

Delete Files Older than X Number of Days in Linux How to keep limited amount of backup files or how to delete backup files or any file t...

How to Block Facebook, Twitter and YouTube HTTPS Traffic In Squid Transparent Proxy Mode

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<span style="color: red; font-family: verdana, geneva, sans-serif; font-size: large;"><span style="line-height: 26px;"><b><u>Block Facebook, Twitter and YouTube’s HTTPS Traffic In Squid Transparent Proxy Mode</u></b></span></span><br />
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">After setting up <a href="http://www.hackthesec.co.in/2016/05/how-to-configure-squid-3x-as.html" target="_blank">Squid As Transparent Proxy Mode</a>, most of the system admins try to block famous social media websites such as Facebook, Twitter and YouTube in their network.So in this guide we will learn how to Block HTTPS Traffic while Squid is running as Transparent Proxy.</span></span><br />
<a href="http://www.hackthesec.co.in/2016/05/how-to-configure-squid-3x-as.html" itemprop="url" style="background-color: white; display: block; font-family: 'Open Sans', serif, sans-serif; font-size: 18.6px; font-weight: 600; text-decoration: none;"></a><br />
<ul style="text-align: left;">
<li><a href="http://www.hackthesec.co.in/2016/05/how-to-configure-squid-3x-as.html" itemprop="url" style="display: inline !important; font-size: 18.6px; text-decoration: none;"><span style="color: red;">How to Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7</span></a></li>
</ul>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu5EEcgs1XrKXPdiyB1Q9PXqvHPrQfndedFITprHVBeAFc0Ob0eu6tPF6Q9cnbSsn_9PcqWs-TgRQ5VdO5HmWfRMMgzhp8Niz6GEiKzSFt5fc76UHNuThqmUgiwW1P1-451tDcx7pK59RW/s1600/access-blocked-websites-hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu5EEcgs1XrKXPdiyB1Q9PXqvHPrQfndedFITprHVBeAFc0Ob0eu6tPF6Q9cnbSsn_9PcqWs-TgRQ5VdO5HmWfRMMgzhp8Niz6GEiKzSFt5fc76UHNuThqmUgiwW1P1-451tDcx7pK59RW/s1600/access-blocked-websites-hackthesec.co.in.png" /></a></div>
<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;">We understand now that 443 port traffic is passing through iptables firewall. So with the help of iptables string matching feature we will see how to block Facebook, Twitter and YouTube HTTPS traffic.</span></span><br />
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Iptables Rule to Block Facebook in Squid Transparent Proxy Setup</u></b></span></span><br />
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">iptables -I FORWARD -p tcp --dport 80 -m string --string 'facebook.com' --algo bm --to 65535 -j DROP</span></span></pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">
iptables -I FORWARD -p tcp --dport 443 -m string --string 'facebook.com' --algo bm --to 65535 -j DROP</span></span></pre>
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Iptables Rule to Block Twitter in Squid Transparent Proxy Setup</u></b></span></span><br />
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">iptables -I FORWARD -p tcp --dport 80 -m string --string 'twitter.com' --algo bm --to 65535 -j DROP</span></span></pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">
iptables -I FORWARD -p tcp --dport 443 -m string --string 'twitter.com' --algo bm --to 65535 -j DROP</span></span></pre>
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>Iptables Rule to Block YouTube in Squid Transparent Proxy Setup</u></b></span></span><br />
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">iptables -I FORWARD -p tcp --dport 80 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</span></span></pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">
iptables -I FORWARD -p tcp --dport 443 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Above rules will block entire traffic destine to 443 port but you can apply same rule on particular single ip, range of ips or complete network.</span></span><br />
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>To Apply Same Rule on Single IP Address</u></b></span></span><br />
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">iptables -I FORWARD -p tcp --dport 443 -s 192.168.2.10 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</span></span></pre>
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>To Apply Same Rule on Range of IP Addresses</u></b></span></span><br />
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">iptables -I FORWARD -p tcp --dport 443 -m iprange --src-range 192.168.2.11-192.168.2.15 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</span></span></pre>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Above rule will block YouTube.com only specified ips from 11 to 15 other all range is allowed.</span></span><br />
<span style="color: #0b5394; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><b><u>To Apply Same Rule on Whole Subnet of 192.168.2.0/24</u></b></span></span><br />
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">iptables -I FORWARD -p tcp --dport 443 -s 192.168.2.0/24 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</span></span></pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></span></span></pre>
</div>

How to Block Facebook, Twitter and YouTube HTTPS Traffic In Squid Transparent Proxy Mode

Block Facebook, Twitter and YouTube’s HTTPS Traffic In Squid Transparent Proxy Mode After setting up Squid As Transparent Proxy Mode , mos...

How to Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7

<div dir="ltr" style="text-align: left;" trbidi="on">
<h2 class="post-heading" style="background-color: white; border: 0px; font-family: sans-serif; font-size: 24px; 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: red;">Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7</span></h2>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">There are several benefits of using a transparent proxy. First of all, for end users, a transparent proxy can enhance their web browsing performance by caching frequently accessed web content, while introducing minimal configuration overhead for them. For administrators, it can be used to enforce various administrative policies such as content/URL/IP filtering, rate limiting, etc.</span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1VrRyKPmaAN8_k1ni3Alq0RVqEPZim4tvw83TXom35GD6ZGJrboNOHhJ97rT251n4G6I7iWctMMqdO5wN9jm5mrF3yErWGe65h2lNz-DioH6G_eOWTR2IFdWRyI2pi9EiwY8B7F-8CN0J/s1600/squid-installation-hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1VrRyKPmaAN8_k1ni3Alq0RVqEPZim4tvw83TXom35GD6ZGJrboNOHhJ97rT251n4G6I7iWctMMqdO5wN9jm5mrF3yErWGe65h2lNz-DioH6G_eOWTR2IFdWRyI2pi9EiwY8B7F-8CN0J/s1600/squid-installation-hackthesec.co.in.jpg" /></a></div>
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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></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">A proxy server acts as an intermediary between a client and a destination server. The client sends requests to the proxy server which then evaluates the requests and takes necessary actions. In this tutorial, we will be setting up a web proxy server using Squid, which is a robust, customizable and stable proxy server. Personally, I had administered a Squid server with 400+ client workstations for about a year. Although I had to restart the service about once a month in average, CPU and storage utilization, throughput and client response time were all great.</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>Squid Installation and Configuration</u></b></span></span></div>
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<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"># yum install squid –y</span></span></pre>
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<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Edit squid configuration file</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Before you edit default configuration file it is highly recommended to keep backup.</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"># cp /etc/squid/squid.conf /etc/squid/squid.conf.bk-26-05-2016</span></span></pre>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Open configuration file and add below mentioned parameters</span></span></div>
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<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"># vi /etc/squid/squid.conf</span></span></pre>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Add transparent proxy setting and add and allow our network</span></span></div>
<div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"># vi /etc/squid/squid.conf</span></span></pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"># Allow LAN Network
acl our_network src 192.168.2.0/24

# Allow Network ACL Allow/Deny Section#
http_access allow our_network

# Transparent Proxy Parameters
http_port 3128 intercept

visible_hostname pxy.hackthesec.co.in</span></span></pre>
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<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Save & Exit</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Now start squid service and make sure it is added on startup.</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;"># systemctl start squid
# systemctl enable squid</span></span></pre>
</div>
</div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Add necessary iptables rules to setup squid as transparent proxy.</span></span></div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">ptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to 192.168.2.100:3128
iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 3128
iptables --t nat -A POSTROUTING --out-interface eth1 -j MASQUERADE</span></span></pre>
</div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Now you can save your iptable rules by following command:</span></span></div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">service iptables save</span></span></pre>
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<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">That’s It, Now squid should work smoothly in transparent proxy mode.</span></span></div>
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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></div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></span></span></div>
</div>

How to Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7

Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7 There are several benefits of using a transparent proxy. First of all, for...

How to Create a Bootable Ubuntu 16.04 USB Flash Drive

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<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: red;">Bootable Ubuntu 16.04<span style="border: 0px; font-size: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">USB </span><span style="border: 0px; font-size: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Flash </span><span style="border: 0px; font-size: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Drive</span></span></u></h2>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">In the first step you need to know your system's type, Either it is 32-bit or 64-bit Architecture. use this command and check your System Type.</span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzOsa5yIU31WVpfc4MLAQFC3UymfiP42Bo_pqKKfJXl6PoHhJ3xZRB9T7GLKSX53Mb1Ylb3kJskPFRHFaql7sp22A0mJDLPvyxX7_bJu3tsIMHpwvL159m9s0MTDTCU8h8wW45p0vf4TOz/s1600/flash_drive_hackthesec.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzOsa5yIU31WVpfc4MLAQFC3UymfiP42Bo_pqKKfJXl6PoHhJ3xZRB9T7GLKSX53Mb1Ylb3kJskPFRHFaql7sp22A0mJDLPvyxX7_bJu3tsIMHpwvL159m9s0MTDTCU8h8wW45p0vf4TOz/s1600/flash_drive_hackthesec.jpg" /></a></div>
<div>
<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><br /></span></span></div>
<div>
<span style="font-family: verdana, geneva, sans-serif;"><div style="font-size: 15px; line-height: 26px;">
<u><b><span style="color: #0b5394;">Download Ubuntu 16.04 ISO File</span></b></u></div>
<div style="color: #333333; font-size: 15px; line-height: 26px;">
As you can see in the above step my computer is 64-bit so i will Download Ubuntu 16.04 64-bit ISO File</div>
<div style="font-size: 15px; line-height: 26px;">
<a href="http://www.ubuntu.com/download/desktop" target="_blank">Download<span style="color: #333333;">  </span></a><a class="arconix-button arconix-button-medium arconix-button-white" href="http://www.ubuntu.com/download/desktop" style="background-attachment: initial; background-clip: initial; background-color: white; background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgb(255, 255, 255)), to(rgb(237, 237, 237))); background-origin: initial; background-position: initial; background-repeat: initial; 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: 8px; border: 1px solid rgb(183, 183, 183); box-shadow: rgba(255, 255, 255, 0.498039) 0px 1px 0px inset; cursor: pointer; display: inline-block; font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-stretch: normal; line-height: normal; margin-bottom: 10px; outline: none; padding: 6px 24px 7px; text-align: center; text-decoration: none; text-shadow: rgba(0, 0, 0, 0.4) 0px -1px 1px; word-wrap: break-word;" target="_blank"><span style="color: red;">Light Table Installer (.deb)</span></a></div>
<div>
<div>
<span style="font-size: 15px; line-height: 26px;"><b><u><span style="color: #0b5394;">Download Universal USB Installer</span></u></b></span></div>
<div>
<span style="color: #333333;"><span style="font-size: 15px; line-height: 26px;">After Ubuntu has finished downloading now we will move on to the next step which is downloading Universal USB Installer</span></span></div>
</div>
<div>
<span style="color: #333333;"><span style="font-size: 15px; line-height: 26px;"><a href="http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/">Universal USB Installer</a> (Linux to USB Utility)</span></span></div>
<div>
<span style="color: #333333;"><span style="font-size: 15px; line-height: 26px;">Open Universal USB Installer & Follow the Screenshot instructions</span></span></div>
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<span style="color: #333333;"><span style="font-size: 15px; line-height: 26px;">Wait Until the File copy and format process completed after this process you are ready to GO !!</span></span></div>
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<span style="color: #333333;"><span style="font-size: 15px; line-height: 26px;">Process has been completed success you are now ready to launch <a href="http://www.hackthesec.co.in/search/label/Ubuntu" target="_blank">Ubuntu </a>from your</span></span></div>
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<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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How to Create a Bootable Ubuntu 16.04 USB Flash Drive

Bootable Ubuntu 16.04 USB Flash Drive In the first step you need to know your system's type, Either it is 32-bit or 64-bit Archite...

How to Install Light Table IDE in Ubuntu 16.04 via PPA

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<span style="color: red; font-size: large;"><u>Install Light Table IDE in Ubuntu 16.04 via PPA</u></span></h1>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Light Table is an integrated development environment for software engineering developed by Chris Granger and Robert Attorri. It features real-time feedback allowing instant execution, debugging and access to documentation. The instant feedback provides an unusual execution environment intended to help developing abstractions.</span></span></div>
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">The development team attempted to create a program which shows the programmer what the effects of their additions are in real-time, rather than requiring them to work out the effects as they write the code.Though the program began by only supporting Clojure, it has since aimed to support Python and JavaScript due to their popularity. The developers claim that the software can reduce programming time by up to 20%.</span></span></div>
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<span style="font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><div style="color: #333333;">
To make it easy to install Light Table IDE in Ubuntu, there’s now a PPA that contains an installer script, which automatically downloads the official Linux package from <a href="http://www.lighttable.com/">its website</a>, installs and creates a launcher shortcut in your system for better Ubuntu integration.</div>
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First download the script from the link:<a class="arconix-button arconix-button-medium arconix-button-white" href="http://ppa.launchpad.net/dr-akulavich/lighttable/ubuntu/pool/main/l/lighttable-installer/" style="background-attachment: initial; background-clip: initial; background-color: white; background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgb(255, 255, 255)), to(rgb(237, 237, 237))); background-origin: initial; background-position: initial; background-repeat: initial; 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: 8px; border: 1px solid rgb(183, 183, 183); box-shadow: rgba(255, 255, 255, 0.498039) 0px 1px 0px inset; cursor: pointer; display: inline-block; font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-stretch: normal; line-height: normal; margin-bottom: 10px; outline: none; padding: 6px 24px 7px; text-align: center; text-decoration: none; text-shadow: rgba(0, 0, 0, 0.4) 0px -1px 1px; word-wrap: break-word;" target="_blank">Light Table Installer (.deb)</a></div>
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Select download the package "lighttable-installer_xxx_amd64.deb", the click install via Ubuntu Software.</div>
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Or open terminal (Ctrl+Alt+T) and run command install the downloaded package. The script starts automatically after installation:</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">sudo dpkg -i ~/Downloads/lighttable-installer_*.deb</span></span></pre>
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If everything goes OK, you’ll be finally able to launch the IDE from Unity Dash, or other Application Launcher.</div>
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(Optional) To receive future updates of Light Table along with other system updates, you may add the PPA repository so to get updates via Software Updater once a new release is made into PPA.</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; 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: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: medium;"><span style="line-height: 19px; white-space: pre-wrap;">sudo add-apt-repository ppa:dr-akulavich/lighttable</span></span><span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px; white-space: normal;">
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<span style="color: #333333; font-family: verdana, geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">You can then disable, remove, or edit the PPA via System Settings -> System -> Software & Updates -> Other Software.</span></span></div>
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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></div>
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How to Install Light Table IDE in Ubuntu 16.04 via PPA

Install Light Table IDE in Ubuntu 16.04 via PPA Light Table is an integrated development environment for software engineering developed...