mc-router/docs/docker-compose.yml

services:
  vanilla:
    image: itzg/minecraft-server
    environment:
      EULA: "TRUE"
  forge:
    image: itzg/minecraft-server
    environment:
      EULA: "TRUE"
      TYPE: FORGE
  router:
    image: ${MC_ROUTER_IMAGE:-itzg/mc-router}
    depends_on:
      - forge
      - vanilla
    environment:
      # enable API
      API_BINDING: ":25564"
      DEBUG: true
      MAPPING: |
        vanilla.example.com=vanilla:25565
        forge.example.com=forge:25565
    ports:
      - "25565:25565"
      # bind the API port to only loopback to avoid external exposure
      - "127.0.0.1:25564:25564"