文档总结8-linux系统服务的控制

1.systemd

系统初始化程序，系统开始的第一个进程。pid为1

2.systemctl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 disbale 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          ##查看指定服务的依赖关系

systemctl mask sshd                              ##冻结指定服务

systemctl unmask sshd                          ##启动服务

systemctl set-default multi-user.target   ##开机不启动图形

systemctl set-default graphical.target    ##开机启动图形

3.服务状态

systemctl                  status                      服务名称

loaded                                                      ##系统服务已经初始化完成，加载过配置

active(running)                                         ##正有一个或多个程序正在系统中执行

active(exited)                                            ##仅执行一次就正常结束的服务

inactive                                                     ##服务关闭

enabled                                                    ##服务开机启动

disabled                                                    ##服务开机不启动

static                                                         ##服务开机启动项不可被管理

failed                                                         ##系统配置错误