Running docker as sudo

The DOCKER_HOST environment variable isn't set. You can confirm this by doing:

> env

Then as sudo:

> sudo env

Without the DOCKER_HOST variable set, docker can't connect to the daemon.

Try:

sudo DOCKER_HOST=$DOCKER_HOST docker run

This way the required environment variable will be available with sudo.

If you want the DOCKER_HOST variable from your profile to be available when you run docker command with sudo, then you can add the following line to sudoers file. Open with:

sudo visudo

Add:

Defaults        env_keep += "DOCKER_HOST"