Service Management (SYSTEMCTL)

1.systemd
System initialization program, system start of the first process, PID 1

2.systemctl command
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          # #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           # # To load the specified service from the new configuration
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
systemctl set-default multi-user.target # #开机不开启图形
systemctl Set-default graphical.target  # #开机启动图形
setterm                         # #文本界面设定color

3. Service Status
Systemctl Status Service Name

Loaded              # #系统服务已经初始化完成, loaded configuration
active (running)    # #正有一个或多个程序正在系统中执行,
                    #vsftpd is this mode

Atcive (exited)      # #仅执行一次就正常结束的服务,
                     #目前并沒有任何程序在系统中执行

atcive (Waiting) #     #正在执行当中,
                      # But waiting for other events to continue processing

inactive             # #服务关闭
enbaled              # #服务开机启动 Disabled #             #服务开机不自启
Static               # #服务开机启动项不可被管理
failed               # #系统配置错误