docker-compose.yml

version: "3.8"
services:
  mongodb-primary:
    image: bitnami/mongodb:5.0.4
    restart: unless-stopped
    environment:
      - MONGO_INITDB_ROOT_USERNAME=root
      - MONGO_INITDB_ROOT_PASSWORD=example
      - MONGODB_ADVERTISED_HOSTNAME=localhost
      - MONGODB_REPLICA_SET_MODE=primary
      - MONGODB_ROOT_PASSWORD=example
      - MONGODB_REPLICA_SET_KEY=replicasetkey123
    volumes:
      - ./db-data:/data/db
    expose:
      - "27017"
    ports:
      - 27017:27017
  mongodb-secondary:
    image: bitnami/mongodb:5.0.4
    restart: unless-stopped
    depends_on:
      - mongodb-primary
    environment:
      - MONGODB_ADVERTISED_HOSTNAME=mongodb-secondary
      - MONGODB_REPLICA_SET_MODE=secondary
      - MONGODB_INITIAL_PRIMARY_HOST=mongodb-primary
      - MONGODB_INITIAL_PRIMARY_PORT_NUMBER=27017
      - MONGODB_INITIAL_PRIMARY_ROOT_PASSWORD=example
      - MONGODB_REPLICA_SET_KEY=replicasetkey123
  mongo-express:
    image: mongo-express
    restart: always
    ports:
      - 8081:8081
    depends_on:
      - mongodb-secondary
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: root
      ME_CONFIG_MONGODB_ADMINPASSWORD: example
      ME_CONFIG_MONGODB_URL: mongodb://root:example@mongodb-primary:27017/