Check RHEL Last Update

Plugin calculates number of days since last success update on your RHEL, CentOS server.
You have to define your warning and critical thresholds by your own according to your local policy for periodical server update and you will have under control your update process.
Additionally you should define (switch -u)how many packages you have updated last time which can be assumed as regular server update.
Plugin is checking rpm '%{INSTALLTIME} parameter and then calculates days since last update and number updates that you define over -u parameter.
Additionally plugin displays latest Kernel that is applied.
Plugin needs NRPE to be executed remotely. If you decide to define plugin to be executed with arguments over NRPE you have to enable arguments in nrpe.cfg.
nrpe.cfg:
command[check_rhel_lastupdate]=/usr/lib64/nagios/plugins/check_rhel_lastupdate.sh -u $ARG1$ -w $ARG2$ -c $ARG3$