Change Run-Level

	If you would like to change System Run-Level, set like follows.
[1]	Run-Level is set with linking to [/etc/systemd/system/default.target]. For example, the default setting without GUI is set like follows.

[root@dlp ~]#  systemctl get-default multi-user.target [root@dlp ~]#  ll /etc/systemd/system/default.target lrwxrwxrwx. 1 root root 41 Jan 17 19:58 /etc/systemd/system/default.target -> /usr/lib/systemd/system/multi-user.target [root@dlp ~]#  ll /lib/systemd/system/multi-user.target -rw-r--r--. 1 root root 540 Jul 7 2021 /lib/systemd/system/multi-user.target

[2]	For example, if you'd like to change Run-Level to Graphical-Login, set like follows.

[root@dlp ~]#  systemctl set-default graphical.target Removed /etc/systemd/system/default.target. Created symlink /etc/systemd/system/default.target → /usr/lib/systemd/system/graphical.target. [root@dlp ~]#  systemctl get-default graphical.target [root@dlp ~]#  ll /etc/systemd/system/default.target lrwxrwxrwx. 1 root root 40 Jan 17 19:59 /etc/systemd/system/default.target -> /usr/lib/systemd/system/graphical.target