Load balance docker swarm

+1 vote

I have docker swarm mode on one HAProxy container and three python web apps. The container with HAProxy is expose to port 80 and should load balance three containers.

Here is my docker-compose.yml file:

version: '3'
services:
  scraper-node:
    image: scraper
    ports:
      - 5000
    volumes:
      - /profiles:/profiles
    command: >
      bash -c "
        cd src;
        gunicorn src.interface:app \
          --bind=0.0.0.0:5000 \
          --workers=1 \
          --threads=1 \
          --timeout 500 \
          --log-level=debug \
      "
    environment:
      - SERVICE_PORTS=5000
    deploy:
      replicas: 3
      update_config:
        parallelism: 5
        delay: 10s
      restart_policy:
        condition: on-failure
        max_attempts: 3
        window: 120s
    networks:
      - web
  proxy:
    image: dockercloud/haproxy
    depends_on:
      - scraper-node
    environment:
      - BALANCE=leastconn
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    ports:
      - 80:80
    networks:
      - web

Everything works fine but when I try to get to http://localhost I get an error message:

<html>
  <body>
    <h1>503 Service Unavailable</h1>
    No server is available to handle this request.
  </body>
</html>
Aug 24, 2018 in Docker by Hannah
 • 18,520 points • 1,161 views

1 answer to this question.

0 votes

There could be two possibilities 

  1. The command in docker-compose.yml file should be one line.
  2. The scraper image should expose port 5000 
answered Aug 24, 2018 by Kalgi
 • 52,350 points

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