docker-compose.yml

version: '2'
services:
    db: 
        image: mysql:5.7
        restart: always
        environment:
            MYSQL_ROOT_PASSWORD: password
            MYSQL_DATABASE: app
            MYSQL_USER: user
            MYSQL_PASSWORD: password
        ports:
            - "3307:3306"

    elastic:
        image: docker.elastic.co/elasticsearch/elasticsearch:7.9.2-amd64
        environment:
            - cluster.name=my-awesome-elasticsearch-cluster
            - network.host=0.0.0.0
            - bootstrap.memory_lock=true
            - discovery.type=single-node
        ports:
            - "9200:9200"
            - "9300:9300"
    redis:
        image: 'redis:5-alpine'
        command: redis-server
        ports:
            - '6379:6379'

    app: 
        build: .
        command: bundle exec rails s -p 3000 -b '0.0.0.0'
        volumes: 
            - ".:/app"
        ports: 
            - "3001:3000"
        depends_on:
            - db
        links:
            - db
        environment:
            DB_USER: root
            DB_NAME: app
            DB_PASSWORD: password
            DB_HOST: db