Docker Builder on OSX

[Doug Garstang]

All,

I'm trying to use the docker builder for packer on a mac. My packer template contains:

{

  "builders":[{

    "type": "docker",

    "image": "ubuntu",

    "pull": false,

    "export_path": "image.tar"

  }],

  "provisioners":[

    {

      "type": "shell",

      "inline": ["apt-get -y update; apt-get install -y curl"]

    }

  ]

}

When I run 'packer build packer.json', I get the following failure, which I've cut down on for brevity.

==> docker: Creating a temporary directory for sharing data...

==> docker: Starting docker container...

    docker: Run command: docker run -v /var/folders/j4/nqyjdv994637sq_l7_d9465h0000gn/T/packer-docker306353473:/packer-files -d -i -t ubuntu /bin/bash

==> docker: Error running container: Docker exited with a non-zero exit status.

==> docker: Stderr: docker: Error response from daemon: Mounts denied: -for-mac/osxfs/#namespaces for more info.

==> docker: .

==> docker: sq_l7_d9465h0000gn/T/packer-docker306353473

==> docker: is not shared from OS X and is not known to Docker.

==> docker: You can configure shared paths from Docker -> Preferences... -> File Sharing.

==> docker: See https://docs.docker.com/docker.

==> docker:

Build 'docker' errored: Error running container: Docker exited with a non-zero exit status.

Stderr: docker: Error response from daemon: Mounts denied: -for-mac/osxfs/#namespaces for more info.

.

sq_l7_d9465h0000gn/T/packer-docker306353473

is not shared from OS X and is not known to Docker.

You can configure shared paths from Docker -> Preferences... -> File Sharing.

See https://docs.docker.com/docker.

So... why? The message "Mounts denied: -for-mac/osxfs/#namespaces for more info" isn't even grammatically correct english.

 Packer version is latest 0.12.0. Docker version is latest beta. Also tried with latest stable docker 1.12.3.

The docker preferences show /Users, /Volumes, /tmp and /private. The /var directory is a symlink to /var/private.

Thanks,

Doug.

[Alvaro Miranda Aguilera]

in linux

you can use -v to share folders between host and VM.

packer is trying to do:

-v /var/folders/j4/nqyjdv994637sq_l7_d9465h0000gn/T/packer-docker306353473:/packer-files 

Can you test manually some -v ?

As is today, it seems packer expect -v to work.

Alvaro.

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Alvaro

[Doug Garstang]

Running this works fine:

docker run -v /tmp:/packer-files -d -i -t ubuntu /bin/bash

Running this does not:

docker run -v /var/folders:/packer-files -d -i -t ubuntu /bin/bash

This yields the same error. Why is packer choosing to use /var/folders? Can I set this somewhere? Why is /var/folders in my shared folders in the docker preferences but not working?

Doug.

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Alvaro

[Rickard von Essen]

What's your output of "docker info" and have you tried to restart Docker 4 Mac? 

For me running your example works nicely with Docker 4 Mac (1.12.3-beta30).

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