centos 5 kernel version

[ongch]

How do i update the existing kernel 2.18.XX to 2.20.XX ?
is that any effect after upgrade the kernel version?

[davidanand]

hello,

please check these links
Linux Newbie Guide: Kernel Upgrade
upgrade your Linux kernel

[meton_magis]

For centOS, i would actualy recomend using YUM to manage kernel upgrades.

$ yum info kernel

will show all versions available, then as root just type

# yum install kernel-2.20.XX

or whatever version you want. If the version you want isn't listed with the first command, you may have to compile your own using the guides davidanand posted, but yum is alot easier, and less error prone.