# database or a cache. For examples, see the Awesome Compose repository:
# https://github.com/docker/awesome-compose
services:
  server:
    build:
      context: .
      target: final
    ports:
      - 8000:8000
    environment:
      - PG_DBNAME=example
      - PG_HOST=db
      - PG_USER=postgres
      - PG_PASSWORD=mysecretpassword
      - ADDRESS=0.0.0.0:8000
      - RUST_LOG=debug
    # The commented out section below is an example of how to define a PostgreSQL
    # database that your application can use. `depends_on` tells Docker Compose to
    # start the database before your application. The `db-data` volume persists the
    # database data between container restarts. The `db-password` secret is used
    # to set the database password. You must create `db/password.txt` and add
    # a password of your choosing to it before running `docker compose up`.
    depends_on:
      db:
        condition: service_healthy
  db:
    image: postgres
    restart: always
    user: postgres
    secrets:
      - db-password
    volumes:
      - db-data:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=example
      - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
    expose:
      - 5432
    healthcheck:
      test: ["CMD", "pg_isready"]
      interval: 10s
      timeout: 5s
      retries: 5
volumes:
  db-data:
secrets:
  db-password:
    file: db/password.txt
```

Note that the file doesn't specify a network for those 2 services. When you use Compose, it automatically creates a network and connects the services to it. For more information see [Networking in Compose](/manuals/compose/how-tos/networking.md).

Before you run the application using Compose, notice that this Compose file specifies a `password.txt` file to hold the database's password. You must create this file as it's not included in the source repository.

In the cloned repository's directory, create a new directory named `db` and inside that directory create a file named `password.txt` that contains the password for the database. Using your favorite IDE or text editor, add the following contents to the `password.txt` file.

```text
mysecretpassword
```

If you have any other containers running from the previous sections, [stop](./run-containers.md#stop-start-and-name-containers) them now.

Now, run the following `docker compose up` command to start your application.

```console
$ docker compose up --build
```

The command passes the `--build` flag so Docker will compile your image and then start the containers.

Now test your API endpoint. Open a new terminal then make a request to the server using the curl commands:

```console
$ curl http://localhost:8000/users
```

You should receive the following response:

```json
[{ "id": 1, "login": "root" }]
```

## Summary

In this section, you took a look at setting up your Compose file to run your Rust application and database with a single command.

Related information:

- [Docker volumes](/manuals/engine/storage/volumes.md)
- [Compose overview](/manuals/compose/_index.md)

## Next steps

In the next section, you'll take a look at how to set up a CI/CD pipeline using GitHub Actions.