Centos7更改默认启动模式

1.目的 
  因为图形界面比较占用资源，在部署中为了不浪费资源，我们一般使用命令行界面，有需要的时候使用命令startx切换到图形界面 


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  #图形界面 
# 
# To view current default target, run: 
# systemctl get-default 
# 
# To set a default target, run: 
# systemctl set-default TARGET.target 
# 
3.查看当前默认模式 
使用命令：systemctl get-default查看 
[root@zabbix-elk ~]# systemctl get-default 
multi-user.target 
[root@zabbix-elk ~]# 


4.设置默认模式 
使用命令：systemctl set-default TARGET.target设置默认模式 
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.重启验证 
命令行模式切换到图形界面运行命令：startx 
图形界面切换到命令行界面使用：CTRL+ALT+F3 
命令行界面切换到图形界面使用：CTRL+ALT+F5 

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