Docker初次安裝運行出錯：Cannot connect to the Docker daemon at ***/docker.sock. Is the docker daemon running?

報錯信息以下：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? 緣由未啓動docker服務，解決方法： sudo systemctl start docker 另外docker命令執行時，須要sudo　權限。web

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