Docker-compose File

The compose file is a YML file defining services, networks, and volumes for a Docker container. There are several versions of the compose file format available – 1, 2, 2.x, and 3.x.

version: '3'
services:
  app:
    image: node:latest
    container_name: app_main
    restart: always
    command: sh -c "yarn install && yarn start"
    ports:
      - 8000:8000
    working_dir: /app
    volumes:
      - ./:/app
    environment:
      MYSQL_HOST: localhost
      MYSQL_USER: root
      MYSQL_PASSWORD: 
      MYSQL_DB: test
  mongo:
    image: mongo
    container_name: app_mongo
    restart: always
    ports:
      - 27017:27017
    volumes:
      - ~/mongo:/data/db
volumes:
  mongodb:

• version refers to the docker-compose version (Latest 3)

• services defines the services that we need to run

• app is a custom name for one of your containers

• image the image which we have to pull. Here we are using node:latest and mongo.

• container_name is the name for each container

• restart starts/restarts a service container

• port defines the custom port to run the container

• working_dir is the current working directory for the service container

• environment defines the environment variables, such as DB credentials, and so on.

• command is the command to run the service.