docker-compose.yml

version: '3.8'
services:
    #Backend API
    smart-brain-api:                            #name of service
        container_name: backend
        #image: node:16-alpine3.11 commented out since done in Dockerfile
        build: ./                               #tells dockercompose to file Dockerfile (build file) in current path
        command: npm start                      #runs npm start on container startup
        working_dir: /usr/src/smart-brain-api   #define working directory for app
        environment: 
            POSTGRES_URI: ${POSTGRES_URI}
            REDIS_URI: redis://redis:6379
        ports:
            - "3000:3000"                       #define port for application
        volumes:
            - ./:/usr/src/smart-brain-api       #associates containers specified dir to local machine specified dir (local dir:container dir) allows Nodemon to work
    # Postgres
    postgres:
        #image: postgres
        build: ./postgres
        environment: 
            POSTGRES_USER: ${POSTGRES_USER}
            POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
            POSTGRES_DB: smart-brain-docker
            POSTGRES_HOST: postgres
        ports:
            - "5432:5432"
    # Redis
    redis:
        image: redis
        ports:
            - "6379:6379"