# 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
   ```

   Create a file named `.dockerignore` with the following contents.

   ```text {collapse=true,title=".dockerignore"}
   # Include any files or directories that you don't want to be copied to your
   # container here (e.g., local build artifacts, temporary files, etc.).
   #
   # For more help, visit the .dockerignore file reference guide at
   # https://docs.docker.com/go/build-context-dockerignore/

   **/.DS_Store
   **/__pycache__
   **/.venv
   **/.classpath
   **/.dockerignore
   **/.env
   **/.git
   **/.gitignore
   **/.project
   **/.settings
   **/.toolstarget
   **/.vs
   **/.vscode
   **/*.*proj.user
   **/*.dbmdl
   **/*.jfm
   **/bin
   **/charts
   **/docker-compose*
   **/compose.y*ml
   **/Dockerfile*
   **/node_modules
   **/npm-debug.log
   **/obj
   **/secrets.dev.yaml
   **/values.dev.yaml
   LICENSE
   README.md
   ```

   Create a file named `.gitignore` with the following contents.

   ```text {collapse=true,title=".gitignore"}
   # Byte-compiled / optimized / DLL files
   __pycache__/
   *.py[cod]
   *$py.class

   # C extensions
   *.so

   # Distribution / packaging
   .Python
   build/
   develop-eggs/
   dist/
   downloads/
   eggs/
   .eggs/
   lib/
   lib64/
   parts/
   sdist/
   var/
   wheels/
   share/python-wheels/
   *.egg-info/
   .installed.cfg
   *.egg
   MANIFEST

   # Unit test / coverage reports
   htmlcov/
   .tox/
   .nox/
   .coverage
   .coverage.*
   .cache
   nosetests.xml
   coverage.xml
   *.cover
   *.py,cover
   .hypothesis/
   .pytest_cache/
   cover/

   # PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
   __pypackages__/

   # Environments
   .env
   .venv
   env/
   venv/
   ENV/
   env.bak/
   venv.bak/
   ```

   {{< /tab >}}
   {{< /tabs >}}

## Add a local database and persist data

You can use containers to set up local services, like a database. In this section, you'll update the `compose.yaml` file to define a database service and a volume to persist data.

In the cloned repository's directory, open the `compose.yaml` file in an IDE or text editor. `docker init` handled creating most of the instructions, but you'll need to update it for your unique application.

In the `compose.yaml` file, you need to uncomment all of the database instructions. In addition, you need to add the database password file as an environment variable to the server service and specify the secret file to use .

The following is the updated `compose.yaml` file.

```yaml {hl_lines="7-43"}
services:
  server:
    build:
      context: .
    ports:
      - 8001:8001
    environment:
      - POSTGRES_SERVER=db
      - POSTGRES_USER=postgres
      - POSTGRES_DB=example
      - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
    depends_on:
      db:
        condition: service_healthy
    secrets:
      - db-password
  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