This Maybe be useful for the users familiar with Centos 6. Because on 7, the way is totally different to switch between run-levels.
Method 1
Check Runlevel:
[root@localhost ~]# systemctl get-default multi-user.target
You can compare this level with old runlevel3 (text mode).
List Runlevels on your system:
UNIT LOAD ACTIVE SUB DESCRIPTION basic.target loaded active active Basic System bluetooth.target loaded active active Bluetooth cryptsetup.target loaded active active Encrypted Volumes getty.target loaded active active Login Prompts graphical.target loaded active active Graphical Interfac 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 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 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. 16 loaded units listed. Pass --all to see loaded but inactive units, too. To show all installed unit files use 'systemctl list-unit-files'.
Switch to Other runlevel (example = Graphical=runlevel5).
systemctl set-default graphical.target
Reboot to take effect to this runlevel.
Method 2
Check your current runlevel:
[root@localhost ~]# ls -altr /etc/systemd/system/default.target lrwxrwxrwx. 1 root root 37 Sep 17 06:29 /etc/systemd/system/default.target -> /lib/systemd/system/multi-user.target [root@localhost ~]#
Check list of the runlevels:
[root@localhost ~]# ls /lib/systemd/system/runlevel*target -l lrwxrwxrwx. 1 root root 15 Sep 17 06:28 /lib/systemd/system/runlevel0.target -> poweroff.target lrwxrwxrwx. 1 root root 13 Sep 17 06:28 /lib/systemd/system/runlevel1.target -> rescue.target lrwxrwxrwx. 1 root root 17 Sep 17 06:28 /lib/systemd/system/runlevel2.target -> multi-user.target lrwxrwxrwx. 1 root root 17 Sep 17 06:28 /lib/systemd/system/runlevel3.target -> multi-user.target lrwxrwxrwx. 1 root root 17 Sep 17 06:28 /lib/systemd/system/runlevel4.target -> multi-user.target lrwxrwxrwx. 1 root root 16 Sep 17 06:28 /lib/systemd/system/runlevel5.target -> graphical.target lrwxrwxrwx. 1 root root 13 Sep 17 06:28 /lib/systemd/system/runlevel6.target -> reboot.target
Switch to Other runlevel:
rm /etc/systemd/system/default.target ln -s /lib/systemd/system/runlevel5.target /etc/systemd/system/default.target
Or,
ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
Check if runlevel changed:
systemctl get-default
Reboot. That’s it.
