在虛擬機新安裝了個CentOS7，圖形界面啟動太慢，想調整一下按照以前的經驗改運行級別，輸入：
vi /etc/inittab
然後發現跟之前不一樣了，在inittab設置不再生效：
# 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
#
仔細讀一下上面的提示
multi-user.target 類似與之前的runlevel 3
graphical.target 類似與之前的runlevel 5
按照上面的提示，查看當前的默認target輸入命令：
[root@localhost ~]# systemctl get-default
graphical.target
[root@localhost ~]#
當前為graphical.target
修改為命令模式multi-user.target：
[root@localhost ~]# systemctl set-default multi-user.target
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/multi-user.target' '/etc/systemd/system/default.target'
[root@localhost ~]#
查看一下當前，發現得到預期要求：
[root@localhost ~]# systemctl get-default
multi-user.target
[root@localhost ~]#
最後重啟發現，果然是命令模式~~
更多CentOS相關信息見CentOS 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=14
