centos7的运行级别设置

0 - 系统停机状态
1 - 单用户工作状态
2 - 多用户状态
3 - 多用户状态
4 - 系统未使用，留给用户
5 - 图形界面
6 - 系统正常关闭并重新启动

 ：可以看到，centos7并没有centos6中设置默认运行级别的方式。

# 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
#
htfa:35:respawn:/etc/init.d/init.tfa run >/dev/null 2>&1  
根据注释：
 
multi-user.target等同于runlevel 3;
graphical.target等同于runlevel 5;
 
 ：查看当前运行级别
 
systemctl get-default
 
 ：多用用户切换到图形化
 
systemctl set-default graphical.target
 
 ：图形化切换到多用户
 
systemctl set-default multi-user.target