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

[phpmaple]

This is believe docker daemon run on local machine, but my docker daemon run in virtualbox and used docker-machine, please read from DOCKER_HOST and connect to docker daemon

[lucor]

Depending on the configuration you'd need sudo privileges to run docker. Could you please confirm that the docker post installation step have been performed ?

[phpmaple]

Depending on the configuration you'd need sudo privileges to run docker. Could you please confirm that the docker post installation step have been performed ?

I installed virtualbox and installed docker used docker-machine, then used docker before docker env

[lucor]

If I got correctly this happens inside a linux VM running with docker engine installed and running as daemon.
If so, sometimes this kind of errors could be related to user priviliges. Running command with sudo or following the post installation steps, should solve.

If the above is not your case, could you please share the details: OS, versions and the installation steps to allow issue replication ?