systemctl命令¶

备注

摘要: systemctl 是系统服务管理器命令，它实际上将 service 和 chkconfig 这两个命令组合到一起。centos7以上才有的命令，cetnos6用的是service和 chkconfig两个命令

使用:

systemctl [command] [–type=TYPE] [–all]

相关目录:

/usr/lib/systemd/system (Centos)
或 /etc/systemd/system (Ubuntu)

主要有四种类型文件.mount,.service,.target,.wants
现在主要了解「service」相关

实例:

#启动网络服务
systemctl start network.service
#停止网络服务
systemctl stop network.service
#重启网络服务
systemctl restart network.service
#查看网络服务状态
systemctl status network.serivce

查看系统上上所有的服务:

systemctl 列出所有的系统服务
systemctl list-units  列出所有启动unit
systemctl list-unit-files 列出所有启动文件
systemctl list-units –type=service –all 列出所有service类型的unit
systemctl list-units –type=service –all grep cpu  列出 cpu电源管理机制的服务
systemctl list-units –type=target –all  列出所有target

systemctl特殊的用法:

#查看网络服务是否启动
systemctl is-active network.service
#检查网络服务是否设置为开机启动
systemctl is-enable network.service
#注销cups服务
systemctl mask cups.service
#查看cups服务状态
systemctl status cups.service
#取消注销cups服务
systemctl unmask cups.service

systemctl与之前命令对比:

1. 使某服务自动启动:
    chkconfig --level 3 httpd on
    =>
    systemctl enable httpd.service
2. 使某服务不自动启动
    chkconfig --level 3 httpd off
    =>
    systemctl disable httpd.service
3. 检查服务状态
    service httpd status
    =>
    systemctl status httpd.service （服务详细信息）
    systemctl is-active httpd.service （仅显示是否 Active)
4. 显示所有已启动的服务
    chkconfig --list
    =>
    systemctl list-units --type=service
5. 启动某服务
    service httpd start
    =>
    systemctl start httpd.service
6. 停止某服务
    service httpd stop
    =>
    systemctl stop httpd.service
7. 重启某服务
    service httpd restart
    =>
    systemctl restart httpd.service