version: '3'
services:
  webapp: # this can be renamed to any name of choice
    image: webapp:latest # replace this with your web app docker image
    expose:
      - "3000" # any ports that you app is exposing
    restart: always
    depends_on:
      - redis
    links:
      - redis
    environment:
      - REDIS_HOST= redis  # DNS for redis to be accessed by your app
      - VIRTUAL_HOST=*/mywebapp/, */mywebapp/* # path for app eg. localhost:8080/mywebapp/
      - EXTRA_SETTINGS=reqrep ^([^\ :]*)\ /mywebapp/(.*) \1\ /\2 # Optional: used to path rewrite
    networks:  # Optional
      - mynet
  redis:
    image: redis
    expose:
      - "6379"
    volumes:
      - "redis-data:/data"
    command: redis-server --appendonly yes
    networks: # Optional
      - mynet
  lbapp:
    image: dockercloud/haproxy
    links:
      - webapp # Name of the backend service that you want to be load balanced
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    ports:
      - "8080:80" # Map lb's port 80 to 8080 that can be used to accessed lb from outside
    networks: # Optional
      - mynet
networks: # Optional
  mynet:
volumes:
  redis-data: