docker-compose.yml

version: '3'

services:
  app:
    build: .
    volumes:
      - ./:/app/src # /app will be our deployment directory and has additional files 
                    # created during `docker build` (such as node_modules)
                    # /app/src is where we mount the source and will run it
    environment:
      - TZ=Asia/Kolkata

    ports:
      - 8000:8000   # expose port 8000. The script will output its local ip when run,
                    # and you can access the running web-app at ip:8000
    depends_on:
      - mysql       

    command: bash -c "cd ./src && ../wait-for-it.sh -t 180 mysql:3306 -- nodemon server_script.js" 
                   # This waits for mysql server to start listening on default port 
                   # (with a timeout) before we run nodemon
                   # The above is a little ugly. bash -c is needed because o/w we can't use `cd`
                   # We have to use cd because o/w relative paths don't work correctly

  mysql:
    image: mysql:8
    volumes:
      - ./schema:/docker-entrypoint-initdb.d # mount initial schema
      - mysql-data:/var/lib/mysql   # persist data
    environment:
      - TZ=Asia/Kolkata
      - MYSQL_ROOT_PASSWORD=password # just because mysql complains if this isn't set
    expose:
      - 3306

volumes:
  mysql-data: