docker-compose.yml

# Central file in a docker-compose pipeline
# Defines the containers of the pipeline and some environment variables and configuration information

version: '3.1' # Version of Docker Compose

# Each service is a container
services:
  # 1. Container
  tweet_collector: # Name of the service
    build: tweet_collector/ # Build the container using an Docker image definition that is in the directory tweet_collector
    volumes:
      - ./tweet_collector/:/app # volumes creates a synchronization between your local directory ./tweet_collector with the container directory
    # /app
    depends_on: # depends_on tells docker-compose to start the service mongodb before the current service;
      - mongodb
  # 2. Container
  mongodb: # Name of the service
    image: mongo # In this case we are telling docker to pull a predefined image from Docker-Hub
    ports: # Define port of the MongoDB database on_local_machine:inside_of_container
      - 27018:27017 # on_local_machine:inside_of_container

  # 3. Container
  etl_job:
    build: etl_job/
    volumes: 
      - ./etl_job/:/app
    depends_on:
      - mongodb
      - postgresdb

  # 4. Container
  postgresdb: 
    image: postgres
    ports:
      - 5555:5432
    environment: 
      POSTGRES_USER: docker_postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: tweets_db  

 


  # 5. Container
  slackbot: 
    build: slackbot/
    volumes:
      - ./slackbot/:/app
    depends_on:
      - mongodb
      - postgresdb