1.目的?
??因為圖形界面比較占用資源，在部署中為了不浪費資源，我們一般使用命令行界面，有需要的時候使用命令startx切換到圖形界面?


2.查看/etc/inittab文件，cat /etc/inittab?
[root@zabbix-elk ~]# cat /etc/inittab?
# inittab is no longer used when using systemd.?
#?
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.?
#?
# Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target?
#?
# systemd uses 'targets' instead of runlevels. By default, there are two main targets:?
#?
# multi-user.target: analogous to runlevel 3 #命令行界面?
# graphical.target: analogous to runlevel 5 ?#圖形界面?
#?
# To view current default target, run:?
# systemctl get-default?
#?
# To set a default target, run:?
# systemctl set-default TARGET.target?
#?
3.查看當前默認模式?
使用命令：systemctl get-default查看?
[root@zabbix-elk ~]# systemctl get-default?
multi-user.target?
[root@zabbix-elk ~]#?


4.設(shè)置默認模式?
使用命令：systemctl set-default TARGET.target設(shè)置默認模式?
systemctl set-defaultmulti-user.target?
systemctl set-defaultgraphical.target?


[root@zabbix-elk ~]# 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@zabbix-elk ~]# systemctl set-default graphical.target?
Removed symlink /etc/systemd/system/default.target.?
Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/graphical.target.?
5.重啟驗證?
命令行模式切換到圖形界面運行命令：startx?
圖形界面切換到命令行界面使用：CTRL+ALT+F3?
命令行界面切換到圖形界面使用：CTRL+ALT+F5?

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