services:
  mongodb:
    image: mongo:7
    ports:
      # Non-default host port so the example does not clash with a local MongoDB.
      - "27117:27017"
    healthcheck:
      test: ["CMD-SHELL", "mongosh --quiet --eval \"db.runCommand({ ping: 1 }).ok\" | grep -q 1"]
      interval: 2s
      timeout: 5s
      retries: 30
    volumes:
      # MongoDB runs *.js here once, on first start, against an empty data dir.
      - ./init:/docker-entrypoint-initdb.d:ro