version: '2'

services:
  mongodb-primary:
    image: 'bitnami/mongodb:3.6'
    environment:
      - MONGODB_REPLICA_SET_MODE=primary
    volumes:
      - 'mongodb_master_data:/bitnami'

  mongodb-secondary:
    image: 'bitnami/mongodb:3.6'
    depends_on:
      - mongodb-primary
    environment:
      - MONGODB_REPLICA_SET_MODE=secondary
      - MONGODB_PRIMARY_HOST=mongodb-primary

  mongodb-arbiter:
    image: 'bitnami/mongodb:3.6'
    depends_on:
      - mongodb-primary
    environment:
      - MONGODB_REPLICA_SET_MODE=arbiter
      - MONGODB_PRIMARY_HOST=mongodb-primary

volumes:
  mongodb_master_data:
    driver: local