Hack The Sec-Leading Resource Of Linux Tutorial

Automount NFS share in Linux using autofs On Centos/RHEL 7

<div dir="ltr" style="text-align: left;" trbidi="on">
<h1 class="post-title" style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 38px; font-stretch: inherit; font-weight: 400; letter-spacing: -1px; line-height: 1.3em; margin: 0px 0px 10px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="color: #990000;"><u><i>NFS share in Linux using autofs</i></u></span></h1>
<div>
<div style="background-color: white; border: 0px; font-stretch: inherit; margin-bottom: 1em; padding: 0px; text-align: justify; vertical-align: baseline;">
<span style="font-family: PT Serif, serif;"><span style="font-family: Georgia, Times New Roman, serif; font-size: large; line-height: 22.4px;">Autofs is a service in Linux like operating system which automatically mounts the file system and remote shares when it is accessed. Main advantage of autofs is that you don’t need to mount file system at all time, file system is only mounted when it is in demand.</span></span></div>
<ul>
<li><span style="font-family: "pt serif" , serif; line-height: 22.4px;"><a href="http://www.hackthesec.co.in/2016/02/automount-nfs-share-in-linux-using_15.html" target="_blank"><span style="color: red; font-size: large;">Automount NFS share in Linux using autofs On Ubuntu</span></a></span></li>
</ul>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8AITfukaghT7FV_o_Nl2uIrm0ZpWxbpY39Sj3rrjTBRWKJ8XZyiEfFhya9nFm-FXqCJNOJ7XKXkNBOQLOPqWTzQUT7MzjS20tp5CyCfjvcnxsFxStlhh-3NpBOMi453AomEoRPB2jzJJn/s1600/nfs_share_www.hackthsec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8AITfukaghT7FV_o_Nl2uIrm0ZpWxbpY39Sj3rrjTBRWKJ8XZyiEfFhya9nFm-FXqCJNOJ7XKXkNBOQLOPqWTzQUT7MzjS20tp5CyCfjvcnxsFxStlhh-3NpBOMi453AomEoRPB2jzJJn/s1600/nfs_share_www.hackthsec.co.in.jpg" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; text-align: justify; vertical-align: baseline;">
Autofs service reads two files Master map file ( <span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/etc/auto.master</span> ) and a map file like<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/etc/auto.misc</span> or <span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/etc/auto.xxxx</span>.</div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
In ‘/etc/auto.master’ file we have three different fields :</div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="border: 0px; color: navy; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/<Mount-Point>     <Map-file>     <Timeout-Value></span></span></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
In map file (/etc/auto.misc or /etc/auto.xxxx) also we have three different fields:</div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="border: 0px; color: navy; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><Mount-Point>    <Mount-Options>        <Location_of_File System></span></span></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
In this article we will mount the NFS share using autofs. NFS share ‘<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/db_backup</span>‘ is exported from Fedora <span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">NFS Server</span> (<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">192.168.1.21</span>). We are going to mount this nfs share on <a href="http://www.hackthesec.co.in/search/label/centos7" target="_blank">CentOS 7</a>  Linux using autofs.</div>
<h3 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 28px; font-stretch: inherit; letter-spacing: -0.5px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;"><u>Steps to mount nfs share using Autofs in CentOS 7.</u></span></span></h3>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:1 Install autofs package.</span></span></h4>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Install the <b>autofs </b>package using below yum command if it is not installed.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: "courier new" , "courier" , monospace; font-size: large;"><span style="color: white;">[root@hackthesec ~]# yum </span><span style="color: lime;">install autofs</span></span></pre>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:2 Edit the Master map file (/etc/auto.master )</span></span></h4>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Add the following line .</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: large;"><span style="color: white;">[root@hackthesec ~]# vi /etc</span><span style="color: lime;">/auto.master</span><span style="color: white;">
/dbstuff  /etc/auto.nfsdb  --timeout=180</span></span></pre>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; text-align: justify; vertical-align: baseline;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="border: 0px; color: navy; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">Note :</span></span> Mount point ‘<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/dbstuff’</span>‘ must exist on your system. If not then create a directory ‘<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">mkdir /dbstuff</span>‘. NFS Share will automatically umount after 180 seconds or 3 minutes if don’t perform any action on the share.</div>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:2 Creat a map file ‘/etc/auto.nfsdb’</span></span></h4>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Create a map file and add the following line.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: large;"><span style="color: white;">[root@hackthesec ~]# vi /etc/auto.nfsdb</span><span style="color: lime;">db_backup  -fstype=nfs,rw,soft,intr  192.168.1.21:/db_backup</span></span></pre>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Save and exit the file.</div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Where :</div>
<ul style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; list-style: none; margin: 0px 0px 15px 30px; padding: 0px; vertical-align: baseline;">
<li style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: square; margin: 0px; padding: 0px; vertical-align: baseline;">db_backup is a mount point.</li>
<li style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: square; margin: 0px; padding: 0px; vertical-align: baseline;">-fstype=nfs is the file system type & ‘rw,soft,intr’ are mount options.</li>
<li style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: square; margin: 0px; padding: 0px; vertical-align: baseline;">‘192.168.1.21:/db_backup’ is nfs share location.</li>
</ul>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:3 Start the auotfs service.</span></span></h4>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: large;"><span style="color: white;">[root@hackthesec ~]# </span><span style="color: lime;">systemctl </span><span style="color: white;">start autofs.service</span><span style="color: lime;">[root@hackthesec ~]# systemctl enable autofs.service</span><span style="color: white;">ln -s '/usr/lib/systemd/system/autofs.service' '/etc/systemd/system/multi-user.target.wants/</span><span style="color: lime;">autofs.service</span><span style="color: white;">'
[root@hackthesec ~]#</span></span></pre>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:3 Now try to access the mount point.</span></span></h4>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Mount point of nfs share will be ‘<span style="color: #990000;">/dbstuff/db_backup</span>’. When we try access the mount point then <b>autofs </b>service will mount nfs share automatically.</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8X4lsFva5Afqx3NfUgG2h_qJIu5WNHZwDmR30Ze2cwmYWUlkwV5aNc1Vm1nStpxYSGUKrGNXwD9ulU6K2eILDOPgBoaB9YBrzydjKL3baGvpZRxUPqgp40SlSK43VYekLBBibk0bYx-pf/s1600/nfs-mount-autofs_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="187" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8X4lsFva5Afqx3NfUgG2h_qJIu5WNHZwDmR30Ze2cwmYWUlkwV5aNc1Vm1nStpxYSGUKrGNXwD9ulU6K2eILDOPgBoaB9YBrzydjKL3baGvpZRxUPqgp40SlSK43VYekLBBibk0bYx-pf/s640/nfs-mount-autofs_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br />
<a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a><br />
<a href="http://www.twitter.com/hackthesecurity">www.twitter.com/hackthesecurity</a></div>
</div>
</div>

Automount NFS share in Linux using autofs On Centos/RHEL 7

NFS share in Linux using autofs Autofs is a service in Linux like operating system which automatically mounts the file system and remot...

How To Run Command In Background on Linux

<div dir="ltr" style="text-align: left;" trbidi="on">
<h2 class="title single-title title20" style="background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 28px; line-height: 38px; margin: 0px 0px 5px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
<span style="color: #990000;"><u><i>Run Command In Background on Linux</i></u></span></h2>
<div>
<div style="background-color: white; border: 0px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif; font-size: 16px; line-height: 28px;">A background process is the process which executes behind the scenes. These processes run without user intervention. There are various way to do it for example using & or nohup or screen command. The most popular and frequently used are & and nohup(</span><span style="background-color: transparent; line-height: 28px;"><span style="font-family: Georgia, Times New Roman, serif;"><span style="color: red;">nohup is a POSIX command to ignore the HUP (hangup) signal</span>)</span></span><span style="font-family: Georgia, 'Times New Roman', serif; font-size: 16px; line-height: 28px;">. Including of these two options this tutorial will also describes you to use of screen command.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEik24Z5uAYWmQUht9x3UBwH4lHCJP9NBKBMqMVi4BSPMLIfe4aXBO6nGO7oiEO_pYPMpI8LQfSiSAyvEY9-9syqpGph66A9pRN1jKrVjM5I0WQ8EkuepjgCt8ah8U616RTfe89GW1pQC_JQ/s1600/linux-command_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="185" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEik24Z5uAYWmQUht9x3UBwH4lHCJP9NBKBMqMVi4BSPMLIfe4aXBO6nGO7oiEO_pYPMpI8LQfSiSAyvEY9-9syqpGph66A9pRN1jKrVjM5I0WQ8EkuepjgCt8ah8U616RTfe89GW1pQC_JQ/s200/linux-command_www.hackthesec.co.in.jpg" width="200" /></a></div>
<h2 class="heading1" style="background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 24px; font-weight: bolder; line-height: 34px; margin: 45px 0px 12px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
<span style="color: #0b5394;">1. Using &</span></h2>
<div style="background-color: white; border: 0px; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">On Linux/Unix based systems we can easily send any process in background by appending & in command.</span></div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-size: large;">$ ls -l &
$ tar czf temp.tar.gz /tmp &</span><span style="font-size: 0.9em;">
</span></pre>
<div style="background-color: white; border: 0px; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">In this way if you start a command in background and exited from shell, then shell will kill this background process with SIGHUP signal.</span></div>
<h2 class="heading1" style="background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 24px; font-weight: bolder; line-height: 34px; margin: 45px 0px 12px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
<span style="color: #0b5394;">2. Using nohup</span></h2>
<div style="background-color: white; border: 0px; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">To prevent termination of background processes after shell termination use nohup command. nohup command simply use at prefix of command like. All the output generated with commands will save in nohup.out file in current directory.</span></div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-size: large;">$ nohup tar czf temp.tar.gz /tmp &
</span></pre>
<h2 class="heading1" style="background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 24px; font-weight: bolder; line-height: 34px; margin: 45px 0px 12px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
<span style="color: #0b5394;">3. Using Screen</span></h2>
<div style="background-color: white; border: 0px; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Screen is better option for long running processes. Using screen you can simply get the same session running on remote server even after logout from ssh. For this test you can do the following</span></div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-size: large;">$ screen
</span></pre>
<div style="background-color: white; border: 0px; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Now start your process in background.</span></div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-size: large;">$ tar czf temp.tar.gz /tmp &
</span></pre>
<div style="background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 16px; line-height: 28px; margin-bottom: 20px; outline: 0px; padding: 0px; vertical-align: baseline;">
Let’s detach your screen session with keyboard shortcut <span style="color: #990000;">CTRL+a+d or ctrl+alt+d</span>. It will return you to command line. Now exit your ssh session and again connect system through ssh and execute following command to get old screen session running.</div>
<pre style="background: none 0px 0px repeat scroll rgb(60, 60, 60); border-radius: 4px; border: 1px solid rgb(229, 229, 229); color: white; line-height: 1.3em; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-size: large;">$ screen -r

<a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a>
<a href="http://www.twitter.com/hackthesecurity">www.twitter.com/hackthesecurity</a></span></pre>
</div>
</div>

How To Run Command In Background on Linux

Run Command In Background on Linux A background process is the process which executes behind the scenes. These processes run without us...

Command Line Arguments in Linux Shell Scripting

Command Line Arguments in Linux Shell Scripting

Command Line Arguments in Linux Shell Scripting Overview : Command line arguments (also known as positional parameters) are the a...

Deepin Linux 15 - lastore-daemon Privilege Escalation Exploit

<div dir="ltr" style="text-align: left;" trbidi="on">
<h1 style="background-color: white; box-sizing: border-box; color: #555555; font-family: 'Noto Sans', sans-serif; font-size: 38px; font-stretch: normal; font-weight: 300; line-height: 1.4; margin: 0px; text-align: center;">
Deepin Linux 15 - lastore-daemon Privilege Escalation</h1>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikrBhAMUTTAi6avwt4-w1qIqidVSwGlC0hLRyF5UNi31hW7juycwYHLF89c_VOWQA_Y-1tqTWpjqbW15rU9V8knXF5uHfU1psPZfbNgKqr3Jp2P61kfYen0Hd47yjRY37QDRIx5ZsXUWeg/s1600/deepin_linux_vulnerability_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="274" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikrBhAMUTTAi6avwt4-w1qIqidVSwGlC0hLRyF5UNi31hW7juycwYHLF89c_VOWQA_Y-1tqTWpjqbW15rU9V8knXF5uHfU1psPZfbNgKqr3Jp2P61kfYen0Hd47yjRY37QDRIx5ZsXUWeg/s640/deepin_linux_vulnerability_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div>
<br /></div>
<div>
<table class="exploit_list" style="background-color: rgb(239, 239, 239) !important; border-radius: 3px !important; border-spacing: 1px; border: 1px solid rgb(221, 221, 221) !important; box-sizing: border-box; color: #666666; font-family: 'Open Sans', sans-serif; font-size: 14px; line-height: 24px; margin-bottom: 10px; margin-top: 10px; padding: 1px !important; width: 583px;"><tbody style="box-sizing: border-box;">
<tr style="background-color: rgb(248, 248, 248) !important; box-sizing: border-box;"><td style="box-sizing: border-box; padding: 5px 10px;"><strong style="box-sizing: border-box;">Author:</strong> King's Way</td><td style="box-sizing: border-box; padding: 5px 10px;"><br /></td><td style="box-sizing: border-box; padding: 5px 10px;"><br /></td></tr>
<tr style="background-color: rgb(248, 248, 248) !important; box-sizing: border-box;"><td style="box-sizing: border-box; padding: 5px 10px;"><strong style="box-sizing: border-box;">Download Exploit:</strong> <a href="https://www.exploit-db.com/download/39433" style="background-color: transparent; box-sizing: border-box; color: #337ab7; outline: 0px; text-decoration: none; transition-duration: 0.3s; transition-property: background-color, box-shadow, border, color, opacity;"><span class="fa fa-file-code-o" style="box-sizing: border-box; display: inline-block; font-family: "fontawesome"; font-size: inherit; font-stretch: normal; line-height: 1;"></span> Source</a> </td><td colspan="2" style="box-sizing: border-box; padding: 5px 10px;"><br /></td></tr>
</tbody></table>
<br /><a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a><br /><a href="http://www.twitter.com/hackthesecurity">www.twitter.com/hackthesecurity</a></div>
</div>

Deepin Linux 15 - lastore-daemon Privilege Escalation Exploit

Deepin Linux 15 - lastore-daemon Privilege Escalation Author: King's Way Download Exploit: Source www.hackthesec.co.in...

How to Extend Swap Space using Swap file in Linux

<a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a>
<a href="http://www.twitter.com/hackthesecurity">www.twitter.com/hackthesecurity</a></span></span></pre>
</div>
</div>

How to Extend Swap Space using Swap file in Linux

Extend Swap Space using Swap file in Linux There are some scenarios where our Linux box is running out of swap space so in that case we...

How to Configure NIC(Network Interface Card) bonding in CentOS 7 / RHEL 7

<div dir="ltr" style="text-align: left;" trbidi="on">
<h1 class="post-title" style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 38px; font-stretch: inherit; font-weight: 400; letter-spacing: -1px; line-height: 1.3em; margin: 0px 0px 10px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="color: #990000;"><u><i>Configure NIC(Network Interface Card) bonding in CentOS 7 / RHEL 7</i></u></span></h1>
<div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
NIC(Network Interface Card) bonding is also known as Network bonding. It can be defined as the aggregation or combination of multiple NIC  into a single bond interface. It’s main purpose is to provide high availability and redundancy.</div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
In this article we will learn how to configure nic or netwok bonding in <a href="http://www.hackthesec.co.in/search/label/Centos" target="_blank">CentOS </a>7 & <a href="http://www.hackthesec.co.in/search/label/Rhel7" target="_blank">RHEL 7</a>. In my case i have two interface cards (enp0s3 & enp0s8) and will form a bond interface (bond0).</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlJ5P0qDfh0m0fvpo5xFpkQiS0W83L2gMP9c4SNwWQH0XOpkknpTXclyIaSeSZKson8JQzNfFvUq3tc21293NiEZ4OVaSyyzLtVVaKUfwCzdSOEdwvrd-pDVf7TWGIwwGeWQlilD4SOglT/s1600/nic_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="203" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlJ5P0qDfh0m0fvpo5xFpkQiS0W83L2gMP9c4SNwWQH0XOpkknpTXclyIaSeSZKson8JQzNfFvUq3tc21293NiEZ4OVaSyyzLtVVaKUfwCzdSOEdwvrd-pDVf7TWGIwwGeWQlilD4SOglT/s320/nic_www.hackthesec.co.in.jpg" width="320" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<h2 style="background-color: white; border: 0px; color: #155c8e; font-family: 'PT Serif', serif; font-size: 34px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.7px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
Prerequisite :</h2>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
If bonding module is not loaded on your linux box then use the below command to load.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack ~]# </span><span style="color: lime;">modprobe </span><span style="color: white;">bonding</span></pre>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
To list the bonding module info, use following command.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); color: white; font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;">[root@openstack ~]# modinfo bonding</pre>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Output will be something like below</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhudrJtHvDHDO2QHkd6LkeTZW47lVuz2-Ooqhh4oXd3q-UG63Y-pMCS9naylHm6uBVzBE_TjGsW3IFCE8DLo9c5kdjhjN7XnDX2pv57oEMDuEqNFPJw5gLirekMUJL1dhebgpuqyt-BD7Ft/s1600/modinfo-bonding_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="288" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhudrJtHvDHDO2QHkd6LkeTZW47lVuz2-Ooqhh4oXd3q-UG63Y-pMCS9naylHm6uBVzBE_TjGsW3IFCE8DLo9c5kdjhjN7XnDX2pv57oEMDuEqNFPJw5gLirekMUJL1dhebgpuqyt-BD7Ft/s640/modinfo-bonding_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<h5 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 20px; font-stretch: inherit; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:1 Create Bond Interface File</span></span></h5>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Create a bond interface file (<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">ifcfg-bond0</span></span>) under the folder “<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">/etc/sysconfig/network-scripts/</span></span>”</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack network-scripts]# vi </span><span style="color: lime;">ifcfg-bond0</span><span style="color: white;">
</span><span style="color: lime;">DEVICE=bond0
</span><span style="color: white;">TYPE=Bond
NAME=bond0
BONDING_MASTER=yes
</span><span style="color: lime;">BOOTPROTO=none
</span><span style="color: white;">ONBOOT=yes
IPADDR=192.168.1.70
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
BONDING_OPTS="mode=5 miimon=100"</span></pre>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Save & exit the file.</div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Specify the IP address, Netmask & bonding modes as per your requirement. In my example i am using ‘<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">mode=5</span>′</span> which is used to provide fault tolerance and load balancing.</div>
<br /><h5 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 20px; font-stretch: inherit; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">Step:2 Edit the NIC interface files</span></span></h5>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">For ifcfg-enp0s3</span></span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack ~]# vi /etc/</span><span style="color: lime;">sysconfig/network-scripts/ifcfg-enp0s3</span><span style="color: white;">
TYPE=Ethernet
BOOTPROTO=none
DEVICE=enp0s3
ONBOOT=yes
</span><span style="color: lime;">HWADDR="08:00:27:69:60:c9"
</span><span style="color: white;">MASTER=bond0
SLAVE=yes</span></pre>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">For ifcfg-enp0s8</span></span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack ~]# cat /etc/</span><span style="color: lime;">sysconfig/network-scripts/ifcfg-enp0s8</span><span style="color: white;">
TYPE=Ethernet
BOOTPROTO=none
</span><span style="color: lime;">DEVICE=enp0s8
</span><span style="color: white;">ONBOOT=yes
</span><span style="color: lime;">HWADDR="08:00:27:ea:71:8d"
</span><span style="color: white;">MASTER=bond0
SLAVE=yes</span></pre>
<h5 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 20px; font-stretch: inherit; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:3 Restart the Network Service</span></span></h5>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Below command will restart the network service and will bring above changes into the effect.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack ~]# </span><span style="color: lime;">systemctl restart network.service</span></pre>
<h5 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 20px; font-stretch: inherit; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:4 Test & Verify bond interface.</span></span></h5>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Use ‘<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">ifconfig</span></span>‘ & ‘<span style="border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: red;">ip add</span></span>‘ command to check bond interface along with its slave interfaces.</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQJ4uIl7RYeUcTQrlLtYbabZ53Onz5luI9iBtNB8vvPSkvZd7glCQ2Is_rhUsQIaMcbgnN58g8ipA6PP4A29SXY2qmOG-5krQnw52pFXlsUUtC8picTK9X8426REHtQJLlYmGWeAesemGf/s1600/ifconfig-bond_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="350" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQJ4uIl7RYeUcTQrlLtYbabZ53Onz5luI9iBtNB8vvPSkvZd7glCQ2Is_rhUsQIaMcbgnN58g8ipA6PP4A29SXY2qmOG-5krQnw52pFXlsUUtC8picTK9X8426REHtQJLlYmGWeAesemGf/s640/ifconfig-bond_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
Use following command to view bond interface settings like bonding mode & slave interface.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack ~]# cat /proc/net/</span><span style="color: lime;">bonding/bond0</span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifLSZ5SMb-6KrNUIqvoMAqzni7GHeXc5WXmc7E92jzLzjKikUzXDen46Q4nlyoc5lKCyGjhoWoMBr9H6PKTF47C-s54sK3zgCdXFPFvMw2F2wGlHecsEkZdiQ3y3Oc0fA3vsWokNtBqJ7K/s1600/bonding-settings_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="394" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifLSZ5SMb-6KrNUIqvoMAqzni7GHeXc5WXmc7E92jzLzjKikUzXDen46Q4nlyoc5lKCyGjhoWoMBr9H6PKTF47C-s54sK3zgCdXFPFvMw2F2wGlHecsEkZdiQ3y3Oc0fA3vsWokNtBqJ7K/s640/bonding-settings_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<h5 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 20px; font-stretch: inherit; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:5 Fault tolerance testing</span></span></h5>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
To test the fault tolerance we can down one interface and check whether you are still able access the server.</div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: 12px; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="color: white;">[root@openstack ~]# ifdown </span><span style="color: lime;">enp0s8</span><span style="color: white;">
Device 'enp0s8' successfully disconnected.
[root@openstack ~]#</span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBWUdG-Ter-R-PywoumnQQe1jViI_iQKmdOlziNBHsT9XGN2_iS7bWzqBufwHfhRr0gbCpG9cH8QIMiypVSkG6hkNmaZl6AZNk4kK1bmtvgJJIgXQ_211pwDpqEgFUqgLKIl4mh6mS8hnf/s1600/fault-tolerance-bonding_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="410" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBWUdG-Ter-R-PywoumnQQe1jViI_iQKmdOlziNBHsT9XGN2_iS7bWzqBufwHfhRr0gbCpG9cH8QIMiypVSkG6hkNmaZl6AZNk4kK1bmtvgJJIgXQ_211pwDpqEgFUqgLKIl4mh6mS8hnf/s640/fault-tolerance-bonding_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a><br /><a href="http://www.twitter.com/hackthesecurity">www.twitter.com/hackthesecurity</a></div>
</div>
</div>

How to Configure NIC(Network Interface Card) bonding in CentOS 7 / RHEL 7

Configure NIC(Network Interface Card) bonding in CentOS 7 / RHEL 7 NIC(Network Interface Card) bonding is also known as Network bonding...

How to Install and use Ansible (Automation Tool) in CentOS/RHEL 7

</span><span style="color: white; font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-size: large; line-height: 19px; white-space: pre-wrap;">ansible 1.9.2
      </span><span style="background-color: transparent; line-height: 19px; white-space: pre-wrap;"><span style="color: white; font-family: Monaco, Courier New, DejaVu Sans Mono, Bitstream Vera Sans Mono, monospace; font-size: large;">configured module search path = None</span></span></pre>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:3 Setup keys based SSH authentication with Nodes.</span></span></h4>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Generate keys on the Ansible server and copy public key to the nodes.</span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Courier New, Courier, monospace; font-size: large;"><span style="color: white;">root@ansible ~]# </span><span style="color: lime;">ssh-keygen</span></span></pre>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="color: #111111; font-family: arial, 'helvetica neue', helvetica, sans-serif; line-height: 27px;">Sample outputs:</span></div>
<div style="background-color: white; color: #111111; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 16px; line-height: 27px; margin-bottom: 27px; padding: 0px; word-wrap: break-word;">
</div>
<pre style="background-color: #fafbfc; clear: both; color: #666666; font-family: Consolas, Monaco, Menlo, Courier, Verdana, sans-serif; font-size: 16px; line-height: 27px; margin-bottom: 27px; overflow: auto; padding: 14px; tab-size: 4; word-wrap: normal;">Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
94:a0:19:02:ba:25:23:7f:ee:6c:fb:e8:38:b4:f2:42 info@hackthesec.co.in
The key's randomart image is:
+--[ RSA 2048]----+
|... . .          |
|.  . + . .       |
|= . o   o        |
|.*     .         |
|. . .   S        |
| E.o             |
|.. ..            |
|o o+..           |
| +o+*o.          |
+-----------------+</pre>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Use ssh-copy-id command to copy public key of Ansible server to its nodes.</span></div>
</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW9jkLCJ-auGvDatxXnZTZJREIg7j9qqagVT2onvW6YohXpxUJmU7C-9P_0BZTIlEGY4YD4mqtfCvgx-Ijz2IMHAAp9Vp98tW-VW0OrIWe_EjQnTcTwLM_djavCvUQo0r39oohRLfyZeSl/s1600/ssh-copy-id-command_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="260" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW9jkLCJ-auGvDatxXnZTZJREIg7j9qqagVT2onvW6YohXpxUJmU7C-9P_0BZTIlEGY4YD4mqtfCvgx-Ijz2IMHAAp9Vp98tW-VW0OrIWe_EjQnTcTwLM_djavCvUQo0r39oohRLfyZeSl/s640/ssh-copy-id-command_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div>
<h4 style="background-color: white; border: 0px; color: #155c8e; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border: 0px; color: black; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><br /></span></h4>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:4 Define the nodes or inventory of servers for Ansible.</span></span></h4>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">File ‘<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">/etc/ansible/hosts</span>‘ maintains the inventory of servers for Ansible.</span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Courier New, Courier, monospace; font-size: large;"><span style="color: white;">[root@ansible ~]# vi </span><span style="color: lime;">/etc/ansible/hosts</span><span style="color: white;">
[test-servers]
192.168.1.9
192.168.1.10</span></span></pre>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Save and exit the file.</span></div>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Sample output of hosts file.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaqUO2hbo93HrSza0TOL0mXkb__NVre5V_ldZrM9MlE-bOfn6NjjR4kF0yasrFx21X-6VuJ6HiNmT0tsk9HlndM-4lOwBEhetbYHTyTUgBfWWJVFmI6LcOL8Bthrph712SmSsbLMYaVe5a/s1600/ansible-host_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="250" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaqUO2hbo93HrSza0TOL0mXkb__NVre5V_ldZrM9MlE-bOfn6NjjR4kF0yasrFx21X-6VuJ6HiNmT0tsk9HlndM-4lOwBEhetbYHTyTUgBfWWJVFmI6LcOL8Bthrph712SmSsbLMYaVe5a/s640/ansible-host_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<h4 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 24px; font-stretch: inherit; font-weight: 400; letter-spacing: -0.3px; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Step:5 Now try to run the Commands from Ansible Server.</span></span></h4>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="font-family: Georgia, Times New Roman, serif;">Check the connectivity of ‘test-servers’ or ansible nodes using ping</span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Courier New, Courier, monospace; font-size: large;"><span style="color: white;">[root@ansible ~]# </span><span style="color: lime;">ansible -m ping</span><span style="color: white;"> 'test-servers'</span></span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVV0K0EJRiTi33XQZ2DThbrVUOzcXiv5bu4dWOOYSSE_I5xRueeSNdo5fZD-iLxo_4X4wL2TEv-3o_EXc58KRi_x3SqBP6CNFkcGTcuSV9T7LeuHNnDJTWudh7dYG4MTnrmFSi8F-apHd1/s1600/ansible-ping_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/AVvXsEiVV0K0EJRiTi33XQZ2DThbrVUOzcXiv5bu4dWOOYSSE_I5xRueeSNdo5fZD-iLxo_4X4wL2TEv-3o_EXc58KRi_x3SqBP6CNFkcGTcuSV9T7LeuHNnDJTWudh7dYG4MTnrmFSi8F-apHd1/s1600/ansible-ping_www.hackthesec.co.in.jpg" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<h5 style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 20px; font-stretch: inherit; line-height: 1.3em; margin: 0px 0px 14px; padding: 0px; vertical-align: baseline; word-wrap: break-word;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-family: inherit; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394;">Executing Shell commands :</span></span></h5>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394; font-family: Georgia, Times New Roman, serif;">Example :1 Check the uptime of Ansible nodes</span></span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Courier New, Courier, monospace; font-size: large;"><span style="color: white;">[root@ansible ~]# </span><span style="color: lime;">ansible -m</span><span style="color: white;"> command -a "uptime" 'test-servers'</span></span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJ5kFNv-LyXJ2E8qNOiRijqHT6LcBYzIQQrvsJhiX3djLztjDBLl8l2hx9KFkllBU_5h_pGoO2ETq5KoADEe2xAaUYWDhaGqEkzLRXaYmkLt7yewyzxWfmSQ0wvRppa0_gkhaFQIMCrLmW/s1600/ansible-uptime_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/AVvXsEgJ5kFNv-LyXJ2E8qNOiRijqHT6LcBYzIQQrvsJhiX3djLztjDBLl8l2hx9KFkllBU_5h_pGoO2ETq5KoADEe2xAaUYWDhaGqEkzLRXaYmkLt7yewyzxWfmSQ0wvRppa0_gkhaFQIMCrLmW/s1600/ansible-uptime_www.hackthesec.co.in.jpg" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394; font-family: Georgia, Times New Roman, serif;">Example:2 Check Kernel Version of nodes</span></span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: large;"><span style="color: white;">[root@ansible ~]# ansible -m </span><span style="color: lime;">command -a "uname -r" 'test-servers'</span></span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSSpqd_NfA8DEtTUu6GBbnEVgNjRmE2BR8e_zFLECaApERWSsUdMjrosSiw8ZKeCs4bs2XpbIgS6oUaTKp8gOD1eQ2gWuun-9OC7R_yekLuvb1G4SpFiy3Uu00X1z2QVlatymp4ti5_onN/s1600/kernel-version-ansible_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/AVvXsEhSSpqd_NfA8DEtTUu6GBbnEVgNjRmE2BR8e_zFLECaApERWSsUdMjrosSiw8ZKeCs4bs2XpbIgS6oUaTKp8gOD1eQ2gWuun-9OC7R_yekLuvb1G4SpFiy3Uu00X1z2QVlatymp4ti5_onN/s1600/kernel-version-ansible_www.hackthesec.co.in.jpg" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394; font-family: Georgia, Times New Roman, serif;">Example:3 Adding a user to the nodes</span></span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: large;"><span style="color: white;">[root@ansible ~]# ansible -m command -a "useradd mark" 'test-servers'
[root@ansible ~]# ansible -m command -a "</span><span style="color: lime;">grep mark /etc/passwd</span><span style="color: white;">" 'test-servers'</span></span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5N-_Y4WkSKzF0Y5L0OYcMNbyui1CCVxDef4uGiLgVH136u67gMxBGK2oyTxfsWDcfc7obTOZFKxXfXNd6xxKgLgp0xIsuyZ1wdkMjyWsojPJ8IW0CKeAOMOcv3MIxI7N3WLID0fHYLgjj/s1600/useradd-ansible_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/AVvXsEg5N-_Y4WkSKzF0Y5L0OYcMNbyui1CCVxDef4uGiLgVH136u67gMxBGK2oyTxfsWDcfc7obTOZFKxXfXNd6xxKgLgp0xIsuyZ1wdkMjyWsojPJ8IW0CKeAOMOcv3MIxI7N3WLID0fHYLgjj/s1600/useradd-ansible_www.hackthesec.co.in.jpg" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<div style="background-color: white; border: 0px; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; font-size: inherit; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: 600; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><span style="color: #0b5394; font-family: Georgia, Times New Roman, serif;">Example:4 Redirecting the output of command to a file</span></span></div>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-family: Monaco, 'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace; font-stretch: inherit; line-height: 19px; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: large;"><span style="color: white;">[root@ansible ~]# ansible -m command -a "</span><span style="color: lime;">df -Th" 'test-servers</span><span style="color: white;">' > /tmp/command-output.txt</span></span></pre>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnoZ4UNbDPtkgstqb_Ru0-DYmpgQbNT1qi1oOMAP5tIviiNX2Yi-6EKHoTMtVO3UI9O4COYy36uFJ5_tJ8fnmiP7IE6LAaopQb2PQkDo6VfM_TXm7C5RPtg9NgPILVBiXSnKbEg8soQBFs/s1600/redirecting-output-ansible_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="351" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnoZ4UNbDPtkgstqb_Ru0-DYmpgQbNT1qi1oOMAP5tIviiNX2Yi-6EKHoTMtVO3UI9O4COYy36uFJ5_tJ8fnmiP7IE6LAaopQb2PQkDo6VfM_TXm7C5RPtg9NgPILVBiXSnKbEg8soQBFs/s640/redirecting-output-ansible_www.hackthesec.co.in.jpg" width="640" /></a></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<br /></div>
<div style="background-color: white; border: 0px; font-family: 'PT Serif', serif; font-size: 16px; font-stretch: inherit; line-height: 22.4px; margin-bottom: 1em; padding: 0px; vertical-align: baseline;">
<a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a><br /><a href="http://www.twitter.com/hackthesecurity">www.twitter.com/hackthesecurity</a></div>
</div>
</div>