[Solution] What to do if you get a Docker error'ERROR: Cannot connect to the Docker daemon at unix: ///var/run/docker.sock. Is the docker daemon running?'

Solve this

[vagrant@localhost ~]$ sudo docker version Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Method

$ sudo groupadd docker

$ sudo usermod -aG docker $USER

Log in again

$ newgrp docker 

$ sudo docker version

Resolve if there is no daemon error

reference https://docs.docker.com/engine/install/linux-postinstall/ https://stackoverflow.com/questions/21871479/docker-cant-connect-to-docker-daemon

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