Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

問題： Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? 分析： 無法在unix:///var/run/docker.sock上連接到Docker守護進程。docker守護進程正在運行嗎? 很可能是docker並未啓動，所以，先執行systemctl r

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