I'm using Docker Toolbox on OSX.
I've created a data volume container for storing persistent data: https://docs.docker.com/userguide/dockervolumes/#creating-and-mounting-a-data-volume-container.
I checked that this data is indeed stored on the boot2docker VM (created by docker-machine) and not on the container, so that it will persist. However "docker-machine restart " clears out this custom data on the vm.
I can't find documentation on what is happening. I found one forum post mentioning that data in /var/lib/docker will be preserved, but I could not find any official docs stating that and it also seems strange considering the persistent storage guide above doesn't use this path or even mention that your data will be deleted.
Is this expected and if so is there any official documentation on the correct path to store persistent data?
Edit: Adding example of failing senario
$ docker-machine ssh alt docker@alt:~$ docker run -v /data:/var/lib/mysql --name mydata busybox sh -c "echo 'hello' > /var/lib/mysql/hello" docker@alt:~$ docker run --rm --volumes-from mydata busybox sh -c "cat /var/lib/mysql/hello" hello docker@alt:~$ exit $ docker-machine restart alt Starting VM... $ docker-machine ssh alt docker@alt:~$ docker run --rm --volumes-from mydata busybox sh -c "cat /var/lib/mysql/hello" cat: can't open '/var/lib/mysql/hello': No such file or directory