Docker labels

[Nicholas Bayle]

I'm new to docker, so maybe this is just my ignorance, but does adding docker labels actually work with packer?

  9   "builders": [{
 10     "type": "docker",
 11     "image": "ubuntu:18.04",
 12     "export_path": "output-docker/akm-{{user `akm_version`}}-u{{user `u_version`}}-{{user `build_stamp`}}.tar",
 13     "changes": [
 14       "USER admin",
 15       "EXPOSE 6000 6001 6002 6003 5696",
 16       "LABEL com.townsend.version=1.0"
 17     ]
 18   }],

The resulting image has no labels.

docker ps --format "table {{.ID}}\t{{.Labels}}"
CONTAINER ID        LABELS
11b32092d884

Nick

[Rickard von Essen]

docker ps shows the running Docker containers

You should use:

docker inspect <image> --format "{{ .ContainerConfig.Labels }}"

Images labels doesn't propagate from a image to a container started from it.

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[Nicholas Bayle]

I figured I was missing something like that.

That said, I get:

docker inspect --format '{{ .ContainerConfig.Labels }}' 06a7e57ba554
map[]

Here's the full output. Labels is null:

docker inspect 06a7
[
    {
        "Id": "sha256:06a7e57ba5549e6c2bd1bdbbd7ad6369bb471ee180b41e636cd2b60fc82f0f8f",
        "RepoTags": [],
        "RepoDigests": [],
        "Parent": "",
        "Comment": "Imported from -",
        "Created": "2019-03-18T18:19:25.921251641Z",
        "Container": "",
        "ContainerConfig": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "DockerVersion": "18.09.3",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 571834611,
        "VirtualSize": 571834611,
        "GraphDriver": {
            "Data": {
                "MergedDir": "/var/lib/docker/overlay2/7a747e66900365c1a537cc8d11f9b226304211c22a13fea5be57a698cd5aea1a/merged",
                "UpperDir": "/var/lib/docker/overlay2/7a747e66900365c1a537cc8d11f9b226304211c22a13fea5be57a698cd5aea1a/diff",
                "WorkDir": "/var/lib/docker/overlay2/7a747e66900365c1a537cc8d11f9b226304211c22a13fea5be57a698cd5aea1a/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:ce86195a57b0d70635318da7f6123303ab8687b688cb458a55cd24be0fc8402d"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

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[Rickard von Essen]

Sorry I pointed to the wrong Labels..

$ cat docker-label.json

{

  "builders": [

    {

      "type": "docker",

      "image": "ubuntu:16.04",

      "commit": true,

      "changes": [

        "LABEL foo=bar"

      ]

    }

  ]

}

$ packer build docker-label.json

docker output will be in this color.

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

==> docker: Pulling Docker image: ubuntu:16.04

    docker: 16.04: Pulling from library/ubuntu

    docker: Digest: sha256:58d0da8bc2f434983c6ca4713b08be00ff5586eb5cdff47bcde4b2e88fd40f88

    docker: Status: Image is up to date for ubuntu:16.04

==> docker: Starting docker container...

    docker: Run command: docker run -v /Users/rickard.von.essen/.packer.d/tmp:/packer-files -d -i -t ubuntu:16.04 /bin/bash

    docker: Container ID: e231976dedf1f08ed8a7b8f85073c7f8d198d4b0ee9bcc6010df140e3b56b1a6

==> docker: Using docker communicator to connect: 172.17.0.2

==> docker: Committing the container

    docker: Image ID: sha256:f36adac65043d944f1e4f3d8764766f3238475d317785279f333838ce0e7889a

==> docker: Killing the container: e231976dedf1f08ed8a7b8f85073c7f8d198d4b0ee9bcc6010df140e3b56b1a6

Build 'docker' finished.

==> Builds finished. The artifacts of successful builds are:

--> docker: Imported Docker image: sha256:f36adac65043d944f1e4f3d8764766f3238475d317785279f333838ce0e7889a

$  docker inspect sha256:f36adac65043d944f1e4f3d8764766f3238475d317785279f333838ce0e7889a --format "{{ .Config.Labels }}"

map[foo:bar]

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[Nicholas Bayle]

No dice. Is it safe to assume that "changes": [] only works with commit, not export_path?

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[Rickard von Essen]

Yes, export produces a tar with the content of the file system, but nothing else, so all metadata is lost. 

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[Nicholas Bayle]

Gotcha. So I'll use commit and then use the docker-save post-processor.

Thanks

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