Linux修改运行级别：inittab is no longer used when using systemd.

现象：

• 不管是输入命令 init 3 或者 init5 ，重启后都是直接进入图形界面
• vim /etc/inittab 查看，内容如下：

# 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

解决方案：

• 英文注释写的很清楚，大致就是用systemctl set-default   和 systemctl get-default 取代数字级别

• # 查看当前运行级别
  systemctl get-default
  
  # 设置当前运行级别为3 （开机为命令行模式）
  systemctl set-default multi-user.target
  
  # 设置当前运行级别为5 （开机为图形界面）
  systemctl set-default graphical.target