Steps to patch Linux/RHEL server.

Today we will look linux server patching process in short.

It is quite simple, however very useful to know the steps.

Linux Production Server Patching Steps

Pre-requisite:- I am assuming you have already assigned latest repo to the server.

We need to follow below steps to do patching on server.

a. Check for updates which are available.

# yum check-update


b. Verify Enough space on partition, else make some more space.

# df -h / /var 


c. Update the server.

# yum -y update


d. Reboot the server.

# init 6 


e. Remove old kernel.

# yum erase kernel-2.6.32-754.15.3.el6.x86_64 kernel-2.6.32-754.9.1.el6.x86_64 kernel-devel-2.6.32-754.9.1.el6.x86_64 kernel-devel-2.6.32-754.15.3.el6.x86_64


f. Verify new kernel is installed which was there during check update.

# uname -a


Must Check before proceeding with patching:

To check with backup team if backup is available of the server.
Take backup of important OS file output, command output and cluster commands.
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