Kernel is the central component of an Operating System which is responsible for memory, process, and task and disk management.The first thing you need to think about updating a kernel is that “why do you need a kernel update”.
Now, you need to download the latest kernel RPMs from ftp://updates.or from any mirror sites. Before proceeding with the RPM installation/update, you need to verify that the RPMs were downloaded properly.
Sometimes you may finish downloading with corrupted RPMs.
So, in order to make the kernel update successful, you need to confirm the loaded RPMs md5 sum using the following command (on redhat 5.x machines).
If all the MD5 sums are showing “OK”, you are fine to proceed.
• Drivers for the hardware you do have are updated and you need to use them.
• Most Important: Security holes have been found in earlier kernels and are fixed in the latest kernel.
We can now see how to install/update the current redhat kernel RPM.
First, you need to check (and note down) the current RPM kernel packages that are currently installed in the server. These commands will give the package names of the ones installed in your server.
It is always recommended to have a boot disk in hand while proceeding with kernel upgrade as you may ended up with a non-bootable machine in case of any unsuccessful kernel update.