Automatic Updates in RHEL 6 and CentOS 6
I host this site on a VPS running CentOS 6 and wanted a way to be automatically notified of any updates that are available. In a previous life I was a RHEL 5 system administrator and the tool for doing this was yumupdatesd, though I never personally used it — I like to control when and what updates are installed in a production environment. That tool no longer exists in RHEL 6 and has been replaced with yum-cron.
Install and configure yum-cron
via Automatic Updates in RHEL 6 and CentOS 6.