| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556 | version: "2"services:  voting-app:    build: ./voting-app/.    volumes:     - ./voting-app:/app    ports:      - "5000:80"    links:      - redis    networks:      - front-tier      - back-tier  result-app:    build: ./result-app/.    volumes:      - ./result-app:/app    ports:      - "5001:80"    links:      - db    networks:      - front-tier      - back-tier  worker:    build: ./worker    links:      - db      - redis    networks:      - back-tier  redis:    image: redis    ports: ["6379"]    networks:      - back-tier  db:    image: postgres:9.4    volumes:      - "db-data:/var/lib/postgresql/data"    networks:      - back-tiervolumes:  db-data:networks:  front-tier:  back-tier:
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