• 常用命令

systemctl list-units            ##列出当前系统服务的状态

systemctl list-unit-files       ##列出服务的开机状态

systemctl status sshd           ##查看指定服务的状态

systemctl stop sshd             ##关闭指定服务

systemctl start sshd            ##开启指定服务

systemctl restart sshd          ##从新启动服务

systemctl enable sshd           ##设定指定服务开机开启

systemctl disable sshd          ##设定指定服务开机关闭

systemctl reload sshd           ##使指定服务从新加载配置

systemctl list-dependencies sshd    ##查看指定服务的倚赖关系

systemctl mask  sshd            ##冻结指定服务

systemctl unmask sshd           ##启用服务