systemctl服务------字符和图像界面切换systemctl set-default multi-user.target systemctl isolate multi-user.target #当前立即进入字符模式 [root@room4pc09 桌面]# systemctl isolate graphical.target #当前立即进入图形模式

• 查看服务运行状态

[root@room4pc09 桌面]# systemctl status crond #查看服务运行状态 ● 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. 

• 查看服务是否开启

[root@room4pc09 桌面]# systemctl is-enabled crond.service #查看服务是否开启 enabled 

• 查看服务是否活跃

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

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

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

• 设置默认的运行模式

[root@room4pc09 桌面]# systemctl set-default graphical.target #设置为图形模式 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 #查看默认模式 graphical.target [root@room4pc09 桌面]# reboot #重启 

[root@room4pc09 桌面]# systemctl isolate multi-user.target #当前立即进入字符模式 [root@room4pc09 桌面]# systemctl isolate graphical.target #当前立即进入图形模式