docker-compose.yml

version: '3'

x-backend-service: &backend-app
  build: .
  command: 'npm run start:backend'
  expose:
    - 3000
  networks:
    - example-3
  deploy:
    resources:
      limits:
        cpus: '0.5'
        memory: 128M

services:

  client-service:
    build: .
    command: 'npm run start:client'
    environment:
      - SERVICE_NAME=client-service
      - PORT=3000
      - BACKEND_SERVICE_URL=http://haproxy:4000/backend/api
    expose:
      - 3000
    networks:
      - example-3
    ports:
      - 3000:3000
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 128M

  backend-service-node-1:
    <<: *backend-app
    environment:
      - SERVICE_NAME=backend-service
      - PORT=3000
      - FORCE_ERROR=false

  backend-service-node-2:
    <<: *backend-app
    environment:
      - SERVICE_NAME=backend-service
      - PORT=3000
      - FORCE_ERROR=true

  haproxy:
    image: haproxy:2.4-alpine
    expose:
      - 4000
      - 8080
    environment:
      - FRONT_PORT=4000
      - STATS_PORT=8080
      - BACKEND_SERVER_1=backend-service-node-1
      - BACKEND_SERVER_2=backend-service-node-2
      - BACKEND_SERVER_PORT=3000
    ports:
      - 8080:8080
    volumes:
      - ./src/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg
    networks:
      - example-3

networks:
  example-3: