Linux Troubleshooting.: killall

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Apache Interview Questions</h2>
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Here is a list of 10 important Apache Interview Questions.</h3>
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1) What's the command to stop Apache? 
kill the specific process that httpd is running under, or killall httpd. If you have apachectl installed, use apachectl stop. 
 
2) How do you set up a virtual host in Apache? 
 
<div class="code">
<code>
<VirtualHost www.amitmaheshwari.in> 
ServerAdmin admin@amitmaheshwari.in 
DocumentRoot /home/apache/share/htdocs/hostedsites 
ServerName www.amitmaheshwari.in 
ErrorLog /home/apache/logs/error/hostedsites/error_log 
TransferLog /home/apache/logs/access/hostedsites/access_log 
</VirtualHost> 
</code>
</div>
 
3) What is mod_vhost_alias? 
It allows hosting multiple sites on the same server via simpler configurations. 
 
4) What does htpasswd do? 
It creates a new user in a specified group, and asks to specify a password for that user. 
 
5) If you specify both deny from all and allow from all, what will be the default action of Apache? 
In case of ambiguity deny always takes precedence over allow. 
 
6) How do you change the default web root? 
The solution is to change the DocumentRoot in httpd.conf file. 
 
7) Site is accessible under many different hostnames; how to redirect clients so that they see only a single name? 
Many sites map a variety of hostnames to the same content. For example, www.example.com, example.com and www.example.net may all refer to the same site. It is best to make sure that, regardless of the name clients use to access the site, they will be redirected to a single, canonical hostname. 
 
This makes the site easier to maintain and assures that there will be only one version of the site in proxy caches and search engines. 
 
There are two techniques to implement canonical hostnames: 
1. Use mod_rewrite as described in the "Canonical Hostnames" section of the URL Rewriting Guide. 
2. Use name-based virtual hosting: 
 
NameVirtualHost * 
<VirtualHost *> 
ServerName www.example.net 
ServerAlias example.com 
Redirect permanent / http://www.example.com/ 
</VirtualHost> 
<VirtualHost *> 
ServerName www.example.com 
DocumentRoot /usr/local/apache/htdocs 
</VirtualHost> 
 
8) How do I turn automatic directory listings on or off in Apache? 
 
If a client requests a URL that designates a directory and the directory does not contain a filename that matches the 
DirectoryIndex directive, then mod_autoindex can be configured to present a listing of the directory contents. 
 
To turn on automatic directory indexing, find the Options directive that applies to the directory and add the Indexes 
keyword. For example: 
 
<Directory /path/to/directory> 
Options +Indexes 
</Directory> 
To turn off automatic directory indexing, remove the Indexes keyword from the appropriate Options line. To turn off 
directory listing for a particular subdirectory, you can use Options -Indexes. For example: 
<Directory /path/to/directory> 
Options -Indexes 
</Directory> 
 
9) How to do URL Rewriting using Apache? 
 
By using Apache module mod_rewrite we can do url rewriting. It is a really sophisticated module which provides a 
powerful way to do URL manipulations. 
 
10) How do you set up Apache to require a username and password to access certain documents? 
By using htpasswd program we can apply authentication to certain documents. 
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<h3>
IMPORTANT LINUX INTERVIEW QUESTIONS</h3>
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<ol>
<li><a href="http://linux.amitmaheshwari.in/2015/01/linux-ftp-vsftpd-interview-questions.html" target="_blank">Linux FTP vsftpd Interview Questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2015/01/ssh-interview-questions-and-answers.html" target="_blank">SSH Interview Questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2015/01/apache-interview-questions.html" target="_blank">Apache Interview Questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2015/01/nagios-interview-questions.html" target="_blank">Nagios Interview questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2014/11/iptables-tutorials.html" target="_blank">IPTABLES  Interview Questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2015/01/ldap-server-interview-questions.html" target="_blank">Ldap Server Interview Questions</a></li>
<li><a href="https://www.blogger.com/Read%20more%20at:%20http://linux.amitmaheshwari.in/2015/01/lvm-interview-questions.html" target="_blank">LVM Interview questions</a></li>
<li><a href="https://www.blogger.com/Read%20more%20at:%20http://linux.amitmaheshwari.in/2015/01/sendmail-server-interview-questions.html" target="_blank">Sendmail Server Interview Questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2015/01/yum-interview-questions-and-answers.html" target="_blank">YUM Interview Questions</a></li>
<li><a href="http://linux.amitmaheshwari.in/2015/01/yum-interview-questions-and-answers.html" target="_blank">NFS Interview Questions</a></li>
</ol>
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Apache Interview Questions

Apache Interview Questions Here is a list of 10 important Apache Interview Questions. 1) What's the command to stop Apache? ki...

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In this tutorial, I will show how to kill all running processes launched by a user at once</h2>
 
With the help of few command chain, you can kill running process of desired "user" in LINUX 
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Commands like : ps, grep , awk, sudo, kill, pgrep, pkill, killall </h3>
 
First method  
The first method is to feed kill command with a list of process IDs generated by ps command. 
 
$ ps -ef | grep amit | awk '{ print $2 }' | sudo xargs kill -9 
 
Second Method 
 
A more convenient way to look up processes based on user name is to use pgrep. 
 
$ pgrep -u amit | sudo xargs kill -9 
 
Third Method  
 
pkill can streamlines the whole process of looking up processes by user, and sending them signals. A default signal sent by pkill is SIGTERM. Using pkill, you can kill all processes by owner easily. 
 
$ sudo pkill -u amit 
 
Four Method  
 
killall is very similar to pkill in terms of killing processes by user name. 
 
$ sudo killall -u amit</div>

How to kill all processes run by a user on Linux

In this tutorial, I will show how to kill all running processes launched by a user at once With the help of few command chain, you can k...