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Reinstall Kernel

How to reinstall the latest kernel and rebuild initramfs.

Find the latest kernel.

rpm -qa kernel
kernel-3.10.0-1160.6.1.el7.x86_64
kernel-3.10.0-1160.11.1.el7.x86_64

Remove the kernel first, then reinstall.

yum remove kernel-3.10.0-1160.6.1.el7.x86_64
yum install kernel-3.10.0-1160.6.1.el7.x86_64

Removing Old Kernels

How to check which kernel is running on your system

uname -sr

List all kernels installed on the system.

rpm -q kernel

Removing old kernels using package-cleanup. This keeps 2 kernels on the system.

yum install yum-utils
package-cleanup --oldkernels --count=2

Checking Last Patch

You can check when the system was last patch using the following.

# check RPM when the last updates were ran.
rpm -qa --last | grep kernel
# this is a bit of a stretch, but typically a reboot is performed after an upgrade.
uptime