January 17th, 2012 
KJS
How to update CentOS
Keep you CentOS servers secure, this guide will show you how to update CentOS servers remotely using SSH.
yum update
The above command will check all installed RPM packages on the system and check for updates, download the packages and ask you to confirm the updates. If the kernel is updated I recommend rebooting the server after the new RPM packages are installed, if a reboot is not practical at the time of the reboot I would restart any core services Apache / MySQL etc this will use the updated version not the old that will still be in memory.
You can also use this command for point release updates, for example update CentOS 6.1 to 6.2
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