"Use Docker Compose" in Get started tutorial (solved)

General
1

Solution:

I did several searches of the internet and this forum and finally I found Using Bind Mounts: error Couldn’t find a package.json file in “/app” · Issue #76 · docker/getting-started. The last response is the important one. The docker-compose.yml file must be in the app directory. The tutorial says the root of the app project and that is easily misunderstood. The fact that there is a docker-compose.yml file in the top directory contributes to the confusion.

Problem:

I am using Windows 10 Home.

I have been using the Get started tutorial. I got to Use Docker Compose and it was not working so I downloaded a fresh copy of the application. It already has a docker-compose.yml, right? And we are to replace the contents with the contents in the tutorial, right? And then execute the docker-compose up command from the root directory, the directory containing the app directory, right? It seems to work. Everything looks good in the log, except at the bottom it says:

error Couldn't find a package.json file in "/app"

Is the preceding correct? If so then what more information do you need to diagnose the problem?

The tutorial uses the application in docker/getting-started: Getting started with Docker. The following is the contents I have for the docker-compose.yml file.

version: "3.7"

# services:
#  docs:
#    build:
#      context: .
#      dockerfile: Dockerfile
#      target: dev
#    ports:
#      - 8000:8000
#    volumes:
#      - ./:/app

services:
  app:
    image: node:12-alpine
    command: sh -c "yarn install && yarn run dev"
    ports:
      - 3000:3000
    working_dir: /app
    volumes:
      - ./:/app
    environment:
      MYSQL_HOST: mysql
      MYSQL_USER: root
      MYSQL_PASSWORD: secret
      MYSQL_DB: todos

  mysql:
    image: mysql:5.7
    volumes:
      - todo-mysql-data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: todos

volumes:
  todo-mysql-data:
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