nixCraft published a tutorial about how to check CentOS/RHEL needs a full reboot.

How to check if CentOS / RHEL needs a full reboot

Explains how to check if CentOS / RHEL (Red Hat Enterprise Linux) needs a full reboot and which services need to be restarted from the CLI.

How to check if CentOS / RHEL needs a full reboot - nixCraft