Reinstalling the Kernel in CentOS or RHEL Revision as of Sunday, 20 December 2015 at 19:56 UTC
Some facts
yumdoes not remove the kernel entirely.- You can remove and reinstall the kernel since it’s entirely in
memory
Reinstalling your kernel
To see a list of installed kernels:
[root@server ~]# rpm -qa | grep kernel | sort
kernel-2.6.18-308.11.1.el5
kernel-2.6.18-308.13.1.el5
kernel-2.6.18-308.4.1.el5
kernel-2.6.18-308.8.1.el5
kernel-2.6.18-308.8.2.el5
kernel-headers-2.6.18-308.13.1.el5
kernel-xen-2.6.18-308.11.1.el5
kernel-xen-2.6.18-308.13.1.el5
kernel-xen-2.6.18-308.4.1.el5
kernel-xen-2.6.18-308.8.1.el5
kernel-xen-2.6.18-308.8.2.el5
To remove specific ones,
yum remove kernel-2.6.18-308.11.1.el5 kernel-2.6.18-308.13.1.el5
And so on. Now you can
# Install the version you want
yum install kernel-2.6.18-308.13.1.el5
# or the latest version
yum install kernel
Check /boot/grub/menu.lst, and then reboot.