"seed"
      ]
    }
  },
  "target": {
    "result": {
      "context": "result",
      "dockerfile": "Dockerfile",
    },
    "seed": {
      "context": "seed-data",
      "dockerfile": "Dockerfile",
    },
    "vote": {
      "context": "vote",
      "dockerfile": "Dockerfile",
      "target": "dev",
    },
    "worker": {
      "context": "worker",
      "dockerfile": "Dockerfile",
    }
  }
}
```

As you can see, Bake has created a `default` group that includes four targets:

- `seed`
- `vote`
- `result`
- `worker`

This group is created automatically from your Compose file; it includes all of
your services containing a build configuration. To build this group of services
with Bake, run:

```console
$ docker buildx bake
```

### Customize the build group

Start by redefining the default build group that Bake executes. The current
default group includes a `seed` target — a Compose service used solely to
populate the database with mock data. Since this target doesn't produce a
production image, it doesn’t need to be included in the build group.

To customize the build configuration that Bake uses, create a new file at the
root of the repository, alongside your `compose.yaml` file, named
`docker-bake.hcl`.

```console
$ touch docker-bake.hcl
```

Open the Bake file and add the following configuration:

```hcl {title=docker-bake.hcl}
group "default" {
  targets = ["vote", "result", "worker"]
}
```

Save the file and print your Bake definition again.

```console
$ docker buildx bake --print
```

The JSON output shows that the `default` group only includes the targets you
care about.

```json
{
  "group": {
    "default": {
      "targets": ["vote", "result", "worker"]
    }
  },
  "target": {
    "result": {
      "context": "result",
      "dockerfile": "Dockerfile",
      "tags": ["username/result"]
    },
    "vote": {
      "context": "vote",
      "dockerfile": "Dockerfile",
      "tags": ["username/vote"],
      "target": "dev"
    },
    "worker": {
      "context": "worker",
      "dockerfile": "Dockerfile",
      "tags": ["username/worker"]
    }
  }
}
```

Here, the build configuration for each target (context, tags, etc.) is picked
up from the `compose.yaml` file. The group is defined by the `docker-bake.hcl`
file.

### Customize targets

The Compose file currently defines the `dev` stage as the build target for the
`vote` service. That's appropriate for the image that you would run in local
development, because the `dev` stage includes additional development
dependencies and configurations. For the production image, however, you'll want
to target the `final` image instead.

To modify the target stage used by the `vote` service, add the following
configuration to the Bake file:

```hcl
target "vote" {
  target = "final"
}
```

This overrides the `target` property specified in the Compose file with a
different value when you run the build with Bake. The other build options in
the Compose file (tag, context) remain unmodified. You can verify by inspecting
the build configuration for the `vote` target with `docker buildx bake --print
vote`:

```json
{
  "group": {
    "default": {
      "targets": ["vote"]
    }
  },
  "target": {
    "vote": {
      "context": "vote",
      "dockerfile": "Dockerfile",
      "tags": ["username/vote"],