Docker初次安装运行出错：Cannot connect to the Docker daemon at ***/docker.sock. Is the docker daemon running?

报错信息以下：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? 缘由未启动docker服务，解决方法： sudo systemctl start docker 另外docker命令执行时，须要sudo　权限。web

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