run_levels []

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Run Levels and their meanings:

Value	Explanation
0	Halt
1	Single-user text mode
2	Not used (user-definable)
3	Full multi-user text mode
4	Not used (user-definable)
5	Full multi-user graphical mode (with an X-based login screen)
6	Reboot (Do NOT set initdefault to this)

CentOS 6:
List all services and their run levels:

chkconfig --list

Starting service on boot

chkconfig httpd on

Changing specific run levels:
Turning on run levels 345

chkconfig --level 345 httpd on

Turning off run levels

chkconfig --level 5 httpd off