Linux/Runlevel/Default
Runlevel
- In Debian 9/10, systemd uses targets instead of run-levels.
- The /etc/inittab file is no longer used by systemd to change run levels.
Change Default runlevel
The Default runlevel can be set either by using the systemctl command or making a symbolic link of runlevel targets file to the default target file.
Method 1
Let’s check the current run level by using the following command.
# systemctl get-default graphical.target
Before changing the default runlevel, check out the available targets.
# systemctl list-units --type=target UNIT LOAD ACTIVE SUB DESCRIPTION basic.target loaded active active Basic System cryptsetup.target loaded active active Encrypted Volumes getty.target loaded active active Login Prompts graphical.target loaded active active Graphical Interface local-fs-pre.target loaded active active Local File Systems (Pre) local-fs.target loaded active active Local File Systems multi-user.target loaded active active Multi-User System network-online.target loaded active active Network is Online network.target loaded active active Network nss-user-lookup.target loaded active active User and Group Name Lookups paths.target loaded active active Paths remote-fs.target loaded active active Remote File Systems slices.target loaded active active Slices sockets.target loaded active active Sockets sound.target loaded active active Sound Card swap.target loaded active active Swap sysinit.target loaded active active System Initialization time-sync.target loaded active active System Time Synchronized timers.target loaded active active Timers LOAD = Reflects whether the unit definition was properly loaded. ACTIVE = The high-level unit activation state, i.e. generalization of SUB. SUB = The low-level unit activation state, values depend on unit type.
Issue the following command to change the default runlevel to runlevel 3 (nothing but a multi-user.target).
# systemctl set-default multi-user.target
Confirm the default runlevel.
# systemctl get-default multi-user.target
Reboot and check it out.
# reboot
Method 2
In the previous method, we made the runlevel 3 as the default runlevel. You can also confirm that using the following command.
#systemctl get-default multi-user.target
For a demo, issue the following command to make runlevel 5 as the default runlevel.
# ln -sf /lib/systemd/system/runlevel5.target /etc/systemd/system/default.target OR # ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
Again check the current level. Now the default runlevel is the graphical mode(runlevel 5).
# systemctl get-default graphical.target
Reboot the machine and check it out.
# reboot