runlevel: Check your current runlevel. Then change it

Today’s commands are how you can check what runlevel your system is in and then change it.

Check the current runlevel:

[[email protected] tmp]# runlevel   
N 5

Change the current runlevel:

[[email protected] tmp]# init <new_level>

The run levels in Unix/Linux are used to define what state init (the parent of all processes) is in. Each distribution of Unix/Linux has different definitions of what run levels starts what processes.

Usually you can find the different definitions in /etc/inittab below is the one from a fedora box.

# Default runlevel. The runlevels used are:  
# 0 - halt (Do NOT set initdefault to this)  
# 1 - Single user mode  
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)  
# 3 - Full multiuser mode  
# 4 - unused  
# 5 - X11  
# 6 - reboot (Do NOT set initdefault to this)

About Benjamin

Benjamin is a Infrastructure and Software Engineer. On this blog he writes about Linux, Docker, Programming as well as other Systems topics.

Learn more about Linux

If you liked this article, check out Benjamin's book: Red Hat Enterprise Linux Troubleshooting Guide. Where you can learn a lot more about troubleshooting Linux systems. This book is filled with tips and techniques he has learned over years of managing mission critical systems.