Linux Six Runlevel How to change default Run Level List Runlevel

Linux it has the six run level. For run level 0 to run level 6. I mention in that screen shot. For run level 0 is turn off, Run level 1: it is mainly used by the system administrator. It is used for system maintains and repairing process. It is also called “single user mode”.2 for multi user mode without network, 3 for multi user mode with network, 4 it is unused ,5 for graphical mode , for run level 6 it is turn off.If you like to see there run level file in Linux or centos go to following directory
#cd /etc/inittab
There default run level specified in the line 18
Id:3:intdefault; it is refers to the default run level is 3 by through editing these line you change run level
You can view the all the run level by though following Linux chkconfig command
#chkconfig --listIn the Booting process all the service are running under runlevel 3- “ multi user mode with network”