Runlevel Rhel-7

CentOS 7 / RHEL 7 Check The Current Runlevel 

You still can use “runlevel” command to check the current level, also can use another two commands.

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systemctl get-default Or ll /etc/systemd/system/default.target

Output:
[root@itsprite Desktop]# systemctl get-default
graphical.target

1 2	[root@itsprite Desktop]# ll /etc/systemd/system/default.target lrwxrwxrwx. 1 root root 36 Nov 27 09:31 /etc/systemd/system/default.target -> /lib/systemd/system/graphical.target

CentOS 7 / RHEL 7 Supported Runlevel

Using the followding command to get out the available runlevel, type:

1	systemctl list-units --type=target

Output:

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[root@itsprite Desktop]# 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.target      loaded active active Network nfs.target          loaded active active Network File System Server paths.target        loaded active active Paths printer.target      loaded active active Printer 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 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.

To show all installed unit files use ‘systemctl list-unit-files’.
OR you can use “ll -l /lib/systemd/system/runlevel*.target” to get the runlevel that CentOS 7 system support.

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[root@itsprite Desktop]# ls -l /lib/systemd/system/runlevel*.target lrwxrwxrwx. 1 root root 15 Nov 27 09:18 /lib/systemd/system/runlevel0.target -> poweroff.target lrwxrwxrwx. 1 root root 13 Nov 27 09:18 /lib/systemd/system/runlevel1.target -> rescue.target lrwxrwxrwx. 1 root root 17 Nov 27 09:18 /lib/systemd/system/runlevel2.target -> multi-user.target lrwrwxrwx. 1 root root 17 Nov 27 09:18 /lib/systemd/system/runlevel3.target -> multi-user.target lrwxrwxrwx. 1 root root 17 Nov 27 09:18 /lib/systemd/system/runlevel4.target -> multi-user.target lrwxrwxrwx. 1 root root 16 Nov 27 09:18 /lib/systemd/system/runlevel5.target -> graphical.target lrwxrwxrwx. 1 root root 13 Nov 27 09:18 /lib/systemd/system/runlevel6.target -> reboot.target

CentOS 7 / RHEL 7 Set Default Runlevel

you need to edit the “/etc/inittab” file to set the defatult runlevel in Centos 6.x system, but now the inittab file is no longer used in centos 7 system, and systemd uses “targets” instead of runlevels, there are two main targets: multi-user.target (runlevel 3) and graphical.target( runlevel 5), to set a defalut target or default runlevel, run the following command:

1	ln -sf /lib/systemd/system/<target name>.target /etc/systemd/system/default.target

Example: set default runlevel to multi-user.target, issue the following command:

1	ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target

This way will create symbolic link of runlevel targets to default target file.
Or you can use a systemctl command to set default runlevel, type:

1	systemctl set-default multi-user.target

you must reboot the system, type:

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reboot

CentOS 7 / RHEL 7 Switch Current Runlevel

If you wanna to switch the current runlevel to another, and also do not want to reboot the system, such as, switching the mult-user.target level to graphical.target level immediately, issue the following command:

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systemctl isolate graphical.target OR systemctl isolate runlevel5.target

Also switching to multi-user.target level, using following command:

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systemctl isolate mult-user.target OR systemctl isolate runlevel3.target