If you’re using Docker on a Mac then you’re most likely doing it via boot2docker, which is a lovely puff of pixie dust to hide the fact you’re running Docker in a Linux VM. Even more impressively, the problems I’ve so far encountered can all be laid at the door of VirtualBox1 - in particular, networking. And God forfend you should be using the horror that is Cisco AnyConnect.
Luckily, there’s a workaround for the networking excitment - merely add a port forward to the VM, and then access docker via 127.0.0.1.
To add the port forward, make sure your VM isn’t running and run:
vboxmanage modifyvm "boot2docker-vm" --natpf1 "docker,tcp,127.0.0.1,2376,,2376"
Then, change your DOCKER_HOST environment variable to point at localhost:
If you’re lazy (as I am), you can go one further and add the DOCKER_* variables into your profile and never need to run boot2docker shellinit ever again.
Of course with the announcement of Docker Machine - which supports Fusion and potentially Parallels in the near future - this workaround is hopefully not long for this world. But in the meantime, it’s certainly remove boot2docker as an annoyance in my workflow.