Docker通过一对一的链接进行扩展

使用以下docker-compose.yml文件:

 version: '2' services: redis: image: redis ports: - "6379" myapp: build: ./myapp ports: - "80:80" links: - redis 

当我运行prefix_myapp_1 docker-compose up -d --build ,我将prefix_myapp_1容器链接到prefix_redis_1容器。

如何将myapp缩放到2个实例,每个实例将链接到它自己的redis (即prefix_myapp_1链接到prefix_redis_1prefix_myapp_2链接到prefix_redis_2 )?