版本：CentOS 7
首先：
[root@localhost test]# 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 # [root@localhost test]#
其中：
multi-user.target 代表命令模式
graphical.target 代表圖形界面
使用如下命令可以查看當前所處模式：
[root@localhost test]# systemctl get-default
multi-user.target
使用如下命令修改為圖形界面模式：
systemctl set-default graphical.target
如果重啟后還是沒進入圖形界面，可能系統里沒有安裝，使用如下命令安裝即可：
yum groupinstall -y "GNOME Desktop"