redhat7图形界面与命令行界面的切换

在rhel7中，target取代了runlevels

[root@ykn ~]# 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
# graphical.target: analogous to runlevel 5
#
# To view current default target, run:
# systemctl get-default
#
# To set a default target, run:
# systemctl set-default TARGET.target
#

列出系统中的target

[root@ykn ~]# systemctl list-units --type=target --all

查看当前target

[root@ykn ~]# systemctl get-default 
graphical.target

设置默认界面为纯命令行界面

[root@ykn ~]# 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.

设置默认界面为命令行加上图形界面

[root@ykn ~]# 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.

设置target除了通过命令，还可通过创建软连接来实现

[root@ykn ~]# ll /etc/systemd/system/default.target
lrwxrwxrwx. 1 root root 40 Aug 25 20:51 /etc/systemd/system/default.target -> /usr/lib/systemd/system/graphical.target
[root@ykn ~]# ls -i /etc/systemd/system/default.target
15595713 /etc/systemd/system/default.target
[root@ykn ~]# ls -i /usr/lib/systemd/system/graphical.target
12963355 /usr/lib/systemd/system/graphical.target

不重启的情况下，改变target

• 改变当前界面为纯命令行模式

[root@ykn ~]# systemctl isolate multi-user.target

• 改变当前界面为图形模式

[root@ykn ~]# systemctl isolate graphical.target