Foreword
- systemctl service management system is RHEL instructions 7, before it is fused and chkconfig service functions in one, is a collection of service and replaced chkconfig command and command. You can use it permanently or only enable / disable service in the current session
- CentOS is based on one of RHEL (RedHat Enterprise Linux) Linux distributions, CentOS 7 also use systemctl, replacing the service and chkconfig, you will be redirected to use the equivalent of two systemctl command after command in CentOS 7
- To serve as an example sshd.service
systemctl commonly used commands
列出所有服务：systemctl list-unit-files --type=service
列出服务层级和依赖关系：systemctl list-dependencies sshd.service
显示服务状态：systemctl status sshd.service
启动服务：systemctl start sshd.service
关闭服务：systemctl stop sshd.service
重启服务：systemctl restart sshd.service
设置服务开机自启动：systemctl enable sshd.service
禁止服务开机自启动：systemctl disable sshd.service
查看服务是否自启动：systemctl is-enabled sshd.service
列出系统所有服务的启动情况：systemctl list-units --type=service
列出所有自启动服务：systemctl list-unit-files|grep enabled
service, chkconfig commonly used commands
显示服务状态：service sshd status
启动服务：service sshd start
关闭服务：service sshd stop
重启服务：service sshd restart
设置服务自启动：chkconfig --level 3 sshd on
禁止服务自启动：chkconfig --level 3 sshd off
查看服务是否自启动：chkconfig --list sshd
列出系统所有服务的启动情况：chkconfig --list
References:
Linux - using the command management services systemctl
difference between Linux under systemctl command and service, chkconfig command
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