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老版本的：CentOS5、CentOS6
服务 service xxxx [ stop | start | status | reload | restart ]
/etc/init.d/xxxx [ stop | start | status | reload | restart ]
开机启动或关闭 checkconfig XXX [on|off]
新版本的：CentOS7
服务 systemctl [ stop | start | status | reload | restart ] xxxx.service
开机启动或关闭 systemctl [enable|disable] xxxx.service