command: sh -c "yarn install && yarn run dev"
    ports:
      - 127.0.0.1:3000:3000
    working_dir: /app
    volumes:
      - ./:/app
    environment:
      MYSQL_HOST: mysql
      MYSQL_USER: root
      MYSQL_PASSWORD: secret
      MYSQL_DB: todos

  mysql:
    image: mysql:8.0
    volumes:
      - todo-mysql-data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: todos

volumes:
  todo-mysql-data:
```

## Run the application stack

Now that you have your `compose.yaml` file, you can start your application.

1. Make sure no other copies of the containers are running first. Use `docker ps` to list the containers and `docker rm -f <ids>` to remove them.

2. Start up the application stack using the `docker compose up` command. Add the
   `-d` flag to run everything in the background.

   ```console
   $ docker compose up -d
   ```

    When you run the previous command, you should see output like the following:

   ```plaintext
   Creating network "app_default" with the default driver
   Creating volume "app_todo-mysql-data" with default driver
   Creating app_app_1   ... done
   Creating app_mysql_1 ... done
   ```

    You'll notice that Docker Compose created the volume as well as a network. By default, Docker Compose automatically creates a network specifically for the application stack (which is why you didn't define one in the Compose file).

3. Look at the logs using the `docker compose logs -f` command. You'll see the logs from each of the services interleaved
    into a single stream. This is incredibly useful when you want to watch for timing-related issues. The `-f` flag follows the
    log, so will give you live output as it's generated.

    If you have run the command already, you'll see output that looks like this:

    ```plaintext
    mysql_1  | 2019-10-03T03:07:16.083639Z 0 [Note] mysqld: ready for connections.
    mysql_1  | Version: '8.0.31'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  MySQL Community Server (GPL)
    app_1    | Connected to mysql db at host mysql
    app_1    | Listening on port 3000
    ```