chkconfig command is default command for linux versions.
chkconfig command is basically used for what is status when machine is rebooting. Startup of machine which services get started automatically.
For listing for services:
#su
#ROOT-PASSWORD
#chkconfig –list
If you want to add any service at startup:
# chkconfig –add nginx
If you want to turn on any service at startup:
#chkconfig nginx on
Stopping service
#chkconfig mysql off