检查 Docker 是否正在运行：
systemctl status docker
如果 Docker 正在运行，你会看到类似下面的输出：
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2021-01-01 00:00:00 UTC; 1h ago
Docs:
Main PID: 12345 (dockerd)
Tasks: 27
CGroup: /system.slice/docker.service
└─12345 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
如果 Docker 未运行，你可以使用以下命令启动 Docker 服务：
systemctl start docker
另赋上重启docker的命令：
systemctl restart docker
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