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//移除服务
systemctl reset-failed mysqld

//查看服务状态,可以发现不能使用,移除成功了
systemctl status mysqld

//查找所有或者某个服务
systemctl list-units --type=service | grep network

//列出所有可用单元
systemctl list-unit-files

//列出所有运行中单元
systemctl list-units

//列出所有失败单元
systemctl --failed

//使用systemctl命令杀死服务
systemctl kill mysqld

//列出所有系统挂载点
systemctl list-unit-files --type=mount

//挂载、卸载、重新挂载、重载系统挂载点并检查系统中挂载点状态
systemctl start tmp.mount
systemctl stop tmp.mount
systemctl restart tmp.mount
systemctl reload tmp.mount
systemctl status tmp.mount

//启动服务
systemctl start mysqld

//停止服务
systemctl stop mysqld

//开机自启
systemctl enable mysqld

//开机关闭
systemctl disable mysqld