Centos 7 Run Level修改

markdown 顯示可用的運作層級 ``` systemctl list-units --type target ``` 顯示目前系統預設層級 ``` systemctl get-default ``` 切換到Run Level 3 [文字模式] ``` systemctl isolate multi-user.target ``` 切換到Run Level 5 [圖形模式] ``` systemctl isolate graphical.target ``` 設定開機為Run Level 3 [文字模式] ``` systemctl set-default multi-user.target ``` 設定開機為Run Level 5 [圖形模式] ``` systemctl set-default graphical.target ```