Docker container volumes get HostConfig bindings inserted even without 'host_path' param

[mavogel]

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This issue was originally opened by @hashibot as https://github.com/hashicorp/terraform-provider-docker/issues/13. It was migrated here as a result of the community provider takeover from @kreuzwerker. The original body of the issue is below.

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This issue was originally opened by @cmacrae as hashicorp/terraform#14941. It was migrated here as part of the provider split. The original body of the issue is below.

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Terraform Version

0.9.6

Affected Resource(s)

• docker_container

Terraform Configuration Files

// Docker images
resource "docker_image" "alpine" {
  name = "alpine:latest"
}

// Docker containers
resource "docker_container" "gogs_data" {
  image   = "${docker_image.alpine.latest}"
  name    = "gogs_data"
  volumes = {
    volume_name    = "data"
    container_path = "/data"    
  }
}

Expected Behavior

A Docker container will be provisioned exposing a volume named data, with the container path: /data, without any association of a local directory on the host system (as host_path is not specified).

Actual Behavior

When applying this configuration, part of the payload sent to the remote Docker API:

      "Volumes": {
        "/data": {}
      },
      "Entrypoint": null,
      "HostConfig": {
        "Binds": [
          "data:/data:rw"
        ],

As you can see, HostConfig is added, mapping a bind like so: data:/data:rw.

Important Factoids

When using Triton as a remote Docker endpoint, this causes an issue, as host volumes are not supported, and the following is returned from their API:

* docker_container.gogs_data: Unable to create container: API error (500): host volumes are not supported (34be7a41-8fec-4c0d-904c-2d0ebf6a4b11)

I'm able to work around this using the Docker cli to express a container with a volume exposed without any hostconfiguration binding:

$ docker run -d -v /gogs_data --name gogs_data alpine:latest true 
bfb113a6341ae345c125b144fed755965cf72583a43245e1b368d81c9faafd9b

References

• joyent/sdc-docker hashicorp/terraform#17: Containers with volumes defined in Terraform report "host volumes are not supported"

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[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days. If you don't want this issue to be closed, please set the label pinned.