Red Hat 6 or CentOS 6: Yum Tips – Lock Package Versions and Only Apply Security Updates | In Red Hat 6 or CentOS 6, it is possible to selectively pin or mask a particular package version to keep it from updating. It is also possible to list and apply pending security updates as opposed to security and bug fixes. This is ideal for environments that only want to push out security fixes
CentOS Yum Automatic Updates | How to set CentOS to use automatic updates 1. yum install yum-cron 2. chkconfig yum-cron on 3. /etc/init.d/yum-cron start That’s it! This job will run when regular cron.daily tasks are scheduled to run as specified in /etc/crontab.