Use Socat to support multiple backend with jwilder/nginx-proxy

README.md

Problem from nginx-proxy/nginx-proxy#59, you cannot setup multiple backend for one container.

The solution here, is to use socat as an HTTP proxy.

My use case is "I setup a Apache Spark cluster, I want to access to web UI of master and worker".

docker-compose.yml

version: "2"

services:

  front:
    image: jwilder/nginx-proxy
    ports:
    - 80:80
    volumes:
    - /var/run/docker.sock:/tmp/docker.sock:ro
    
  spark-master:
    image: qwant/djobi-spark
    build: devops/services/spark
    environment:
     SPARK_MASTER_IP: "spark-master"
     DJOBI_ROOT_PATH: "/opt/qwant/djobi"
     VIRTUAL_HOST: "spark.*"
     VIRTUAL_PORT: "8080"
    volumes:
      - .:/opt/qwant/djobi
      - ./devops/users/hdfs/.ssh:/home/hdfs/.ssh:ro

  spark-worker-proxy:
    image: alpine/socat
    command: "TCP-LISTEN:80,reuseaddr,fork,su=nobody TCP:spark-master:8081 "
    environment:
     VIRTUAL_HOST: "spark-worker.*"
     VIRTUAL_PORT: "80"