systemctl服務------字符和圖像界面切換systemctl set-default multi-user.target systemctl isolate multi-user.target #當前立即進入字符模式 [root@room4pc09 桌面]# systemctl isolate graphical.target #當前立即進入圖形模式

• 查看服務運行狀態

[root@room4pc09 桌面]# systemctl status crond #查看服務運行狀態 ● crond.service - Command Scheduler Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled) Active: active (running) since 二 2019-01-29 21:52:22 CST; 1 day 12h ago Main PID: 1403 (crond) CGroup: /system.slice/crond.service └─1403 /usr/sbin/crond -n 1月 29 21:52:22 room4pc09.tedu.cn systemd[1]: Started Command Scheduler. 

• 查看服務是否開啟

[root@room4pc09 桌面]# systemctl is-enabled crond.service #查看服務是否開啟 enabled 

• 查看服務是否活躍

[root@room4pc09 桌面]# systemctl is-active crond active 

• 字符模式：multi-user.target
• 圖形模式：graphical.target

[root@room4pc09 桌面]# systemctl get-default #查看默認模式 multi-user.target 

• 設置默認的運行模式

[root@room4pc09 桌面]# systemctl set-default graphical.target #設置為圖形模式 Removed symlink /etc/systemd/system/default.target. Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/graphical.target. [root@room4pc09 桌面]# systemctl get-default #查看默認模式 graphical.target [root@room4pc09 桌面]# reboot #重啟 

[root@room4pc09 桌面]# systemctl isolate multi-user.target #當前立即進入字符模式 [root@room4pc09 桌面]# systemctl isolate graphical.target #當前立即進入圖形模式