Docker-learning

docker-compose-notes.yml

version: "3.8"
# docker-compose automatically --rm
# all services defined within 1 docker-compose file
# will automatically be added to the same network
services:
  # folder name + service name _1 = container name
  mongodb:
    container_name: "mongodb"
    # override default docker-compose naming convention
    image: "mongo"
    volumes:
      - data:/data/db
    # compose will also auto create data volume
    # containing folder name + _data

    env_file:
      # specify external secrets file
      # "-" means list item
      # KEY: value for single items
      - ./env/mongo.env
    # networks:
    # - goals-net
    # docker will also auto-create network but an already existing one
    # may be specified
    # name = containing folder name + _default

  backend:
    container_name: "backend"
    # override default docker-compose naming convention
    build: ./backend
    ports:
      - "80:80"
    volumes:
      - logs:/app/logs
      # binded-mount, which is specified relative to docker-compose file
      - ./backend:/app
      - /app/node_modules
      # context: /backend
      # dockerfile: Dockerfile
      # longer way of doing it, context folder can be specified
    env_file:
      - ./env/backend.env
    depends_on:
    # One may have to specify multiple services in order to start backend only for example. Setting depends_on automates starting support containers
      - mongodb

  frontend:
    container_name: "frontend"
    # override default docker-compose naming convention
    build: ./frontend
    ports:
      - "3000:3000"
    volumes:
      - ./frontend/src:/app/src
      - ./readonly:/readonly/folder:ro
      # Note :ro to mount as ready only volume
    stdin_open: true
    tty: true
    depends_on:
      - backend

# in order to use the data volume above, it must be declared as below
volumes:
  data:
  logs: