Step 1:查看系统默认运行级别
[root@node-1 html]# systemctl get-default //图形界面
graphical.target
[root@node-1 html]# systemctl list-units --type=target //查看支持的运行级别
Step 2：更改运行级别为level3
[root@node-1 html]# systemctl set-default multi-user.target
Removed symlink /etc/systemd/system/default.target.
Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/multi-user.target.
[root@node-1 html]#
Step 3：reboot