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Basic Centos Commands and Information

Ive been playing around recently with Centos 6.3, over this time as I a Microsoft man Ive struggled to do the most basic of things so as I go along I thought I would compile a list of simple commands.

How do I update Centos?

update

How do I install Apache in Centos?

yum install httpd

How do I set Apache to start on boot in Centos?

chkconfig –-levels 235 httpd on

How do I install MySQL in Centos?

yum install mysql mysql-server

How do I get MySQL to start at boot in Centos?

chkconfig –-levels 235 mysqld on

How do I Secure my MySQL install in Centos?

mysql_secure_installation

Then run through the basic configuration accepting the defaults such as removing the guest accounts and passwords.

How do I restart MySQL in Centos?

 service restart mysqld

How do I install PHP in Centos?

yum install php

How do I restart the Apache service in Centos?

 Service httpd restart

How do I list a directory in Centos?

find

How do I locate a specific file in a directory in Centos?

find . -name FILENAME

How do I locate a file with a certain word in it in Centos?

Lets say you wanted to find a file that had the word log in it.

locate log

How do I restart IPTables in Centos?

 service iptables restart

How do I flush the cache of my IPTables in Centos?

 iptables -f

How do I see what services are running and their status under Centos?

top

and to exit CTRL+X. This service will give you information on what CPU usage and memory usage is being used for a given service.

How do I list in order what service is using the most memory in Centos?

ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10

How do I change the name of my server in Centos?

 hostname yourchosenservername

How do I create a new user in Centos?

adduser thentheusername

How do I change the password for the user I am logged in as in Centos?

passwd

How do I edit files in Centos? I presonally use Nano, so lets first install it.

yum install nano

Then if we want to edit a file with nano. We use nano command then the path to the file, for exampl here we edit the file allen.log in etc.

nano /etc/allen.log

Can I put graphical Interface on Centos to manage all of this?

Yes you can, I recommend Webmin, its simple to install and it is a free alternative to cpanel it also offers auto updates. How do I install Webmin on Centos? First download it like this.

wget http://prdownloads.sourceforge.net/webadmin/webmin-1.620-1.noarch.rpm

Then install Webmin with the following command.

rpm -Uvh webmin-1.620-1.noarch.rpm

You will see after the install the path to your new shiny Webmin control panel. It is normally IPAddress:10000

How do I stop,start and restart Webmin on Centos?

 /etc/init.d/webmin start
 /etc/init.d/webmin stop
 /etc/init.d/webmin restart
 /etc/init.d/webmin status

How Do I Clear The Screen in Centos

Clear

or

 ctrl+l

or

reset

If you have any tips for useful commands then please post them below!

Tags: #linux.centos, commands

Allen White

Allen is a Consultant for ITPS in the North East of England and holds the following accreditations. MCSA, MCSE, MCTS, MCITP, CCA, CCSP, VCP 4,5 and HP ASE, AIS - Network Infrastructure.

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