Manage the runlevel of services on CentOS 6.
List services with runlevel
chkconfig --list
Show a service's runlevel
chkconfig --list ntpd
Enable service at boot
chkconfig sshd on
Enable service at boot for runlevels 2, 3, 4, and 5
chkconfig --level 2345 sshd on
Disable service at boot
chkconfig ntpd off
Disable service at boot for runlevel 3
chkconfig --level 3 ntpd off