查看docker的运行状态
systemctl status docker
输出如下：
[root@izr86o15kikb3az /]# systemctl status docker● docker.service - docker application container engine loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled) active: active (running) since thu 2019-10-24 16:05:01 cst; 29s ago docs: https://docs.docker.com main pid: 6485 (dockerd) tasks: 9 memory: 111.3m cgroup: /system.slice/docker.service └─6485 /usr/bin/dockerd -h fd:// --containerd=/run/containerd/containerd.sock oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.127523857+08:00" level=info msg="ccresolverwrapper...e=grpcoct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.127533900+08:00" level=info msg="clientconn switch...e=grpcoct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.218871071+08:00" level=info msg="[graphdriver] usi...rlay2"oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.233949835+08:00" level=info msg="loading container...tart."oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.631635629+08:00" level=info msg="default bridge (d...dress"oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.764941881+08:00" level=info msg="loading containers: done."oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.775134383+08:00" level=info msg="docker daemon" co...9.03.4oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.775613028+08:00" level=info msg="daemon has comple...ation"oct 24 16:05:01 izr86o15kikb3az systemd[1]: started docker application container engine.oct 24 16:05:01 izr86o15kikb3az dockerd[6485]: time="2019-10-24t16:05:01.815780672+08:00" level=info msg="api listen on /va....sock"hint: some lines were ellipsized, use -l to show in full.
扩展：
启动docker
systemctl start docker
关闭docker
systemctl stop docker
推荐教程：docker教程
以上就是如何通过命令行查看docker服务是否已启动的详细内容。