执行docker ps命令,出现 "Cannot connect to the Docker daemon at unix:///var/run/docker.sock."

执行docker ps命令,出现

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

原因是docker服务没有启动
执行

service docker start

即可解决

另外docker服务设置自动启动

查看已启动的服务systemctl list-units --type=service

查看是否设置开机启动systemctl list-unit-files | grep enable

设置开机启动systemctl enable docker.service

关闭开机启动systemctl disable docker.service

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