ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running? 解决办法

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问题描述：

ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?

If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.
 

解决办法：

sudo groupadd docker
sudo usermod -aG docker $USER

注意：执行完上面命令之后，一定要退出终端重新登录。