Linux 101: What are the Linux systemd equivalents of runlevels?

If systemd is a bit confusing to you, Jack Wallen is here to help ease that a bit by comparing systemd targets to sysvinit runlevels.

linux penguin

Image: Jack Wallen

If you're a Linux admin, you probably remember the old runlevels, which defined a state of initialization the operating system is running in. For example, runlevel 0 was a system halt, runlevel 1 was single-user mode, runlevel 2 was multi-user mode with no network file system, run level 3 was multi-user mode with a text-only interface, run level 4 was user-definable, runlevel 5 was multi-user mode with a GUI and runlevel 6 was reboot. 

That was with sysvinit. Now that most Linux distributions have migrated to systemd, you might be curious as to the equivalent run levels. There isn't a per-level equivalent, because opts to go with target levels, instead of run levels. Because there are only five targets, it doesn't quite map out perfectly. 

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However, systemd takes a much more logical approach to runlevels. Here's how systemd targets track with the old-school runlevels. is shutdown or power off, so it's akin to runlevel 0. launches the rescue shell session, so it's like runlevel 1. launches the system in non-GUI, multi-user mode, so it's like run levels 2, 3, and 4. launches the system into a GUI, multi-user mode, so it's like runlevel 5. 

Finally, shuts down or reboots the system, so it's like runlevel 6. Most of your systems will use runlevels 3, 4 or 5, which translates to either or 

These targets are defined in the systemd startup scripts in /etc/systemd/system and are generally found in the install section, as in 

And those are the systemd equivalents of sysvinit runlevels. Hopefully, this helps to demystify systemd just a bit for you.

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By Jack Wallen

Jack Wallen is an award-winning writer for TechRepublic, The New Stack, and Linux New Media. He's covered a variety of topics for over twenty years and is an avid promoter of open source. For more news about Jack Wallen, visit his website jackwallen....