docker-compose with proxy -> api / app -> postgres / redis / elasticsearch

docker-compose.prod.yml

version: '3'
services:
  proxy:
    build: 
      context: ./src
      dockerfile: dockerfile.proxy
    links:
        - api
        - app
    ports:
        - "80:80"
        
  api:
    build:
      context: ./src
      dockerfile: dockerfile.api
    environment:
      ASPNETCORE_URLS: "http://+:80"
    expose:
     - "80"
    links:
     - "redis"
     - "postgres"
     - "elasticsearch1"
     - "elasticsearch2"

  app:
    build:
      context: ./src
      dockerfile: dockerfile.app
    environment:
      ASPNETCORE_URLS: "http://+:80"
    expose:
     - "80"

  elasticsearch1:
    image: "docker.elastic.co/elasticsearch/elasticsearch:5.6.1"
    volumes:
     - esdata1:/usr/share/elasticsearch/data
    expose:
     - "9200"
     - "9300"
    environment:
      cluster.name: docker-cluster
      bootstrap.memory_lock: true
      ES_JAVA_OPTS: -Xms512m -Xmx512m
    ulimits:
      memlock:
        soft: -1
        hard: -1
    mem_limit: 1g

  elasticsearch2:
    image: "docker.elastic.co/elasticsearch/elasticsearch:5.6.1"
    volumes:
     - esdata2:/usr/share/elasticsearch/data
    expose:
     - "9200"
     - "9300"
    environment:
      cluster.name: docker-cluster
      bootstrap.memory_lock: true
      ES_JAVA_OPTS: -Xms512m -Xmx512m
      discovery.zen.ping.unicast.hosts: elasticsearch1

    ulimits:
      memlock:
        soft: -1
        hard: -1
    mem_limit: 1g

  redis:
    image: "redis"
    volumes:
     - redisdata:/var/lib/redis
    expose:
     - "6379"
    environment:
     REDIS_PASSWORD: 'password'
    
  postgres:
    image: "postgres"
    volumes:
     - pgdata:/var/lib/postgresql/data
    expose:
     - "5432"
    environment:
     POSTGRES_USER: "admin"
     POSTGRES_PASSWORD: "password"
     POSTGRES_DB: "memore"