使用Docker部署集群（即MongoDb / ElasticSearch）并链接到Java应用程序

Question

I need to deploy a Java microservice which interacts with an high-available back-end, such as ElasticSearch or Mongodb.

• What is the idiomatic way to deploy a cluster of an high-available backend such as ElasticSearch or MongoDb and then pass the information to a dockerized microservice?
• Port and container links seems to tie the application to be always deployed with docker, is that a significant drawback?
• Is there an idiomatic way to retrieve the ip of the machines and pass them to the container running the microservice?

Answer 1

Since docker 1.9, the new idiomatic way would be to run a discovery service like Consul , in order to record any container and advertise it to other containers. No more links.

See an example in " Atlassian Orchestration with Docker: multi-host support for the win! ".
You isolate your different services on a 3-node Swarm cluster :

The idea behind using swarm and different nodes is that you can allocate different constraints per node (in term of memory) in order to assign the right service to the right node.