setting up centos to apply updates automatically
Solution 1:
This is done with yum-cron. It includes a cron job at /etc/cron.daily/yum.cron which only runs if the yum service (CentOS 5 'extras' repo) or yum-cron service (CentOS 6 'base' repo) is activated:
CentOS 5:
# yum install yum-cron
# chkconfig --level 345 yum on
# service yum start
CentOS 6:
# yum install yum-cron
# chkconfig --level 345 yum-cron on
# service yum-cron start