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Docker allows you to say "Application X" talks to "Application Y" and it will do the rest with minimal configuration. The same could be accomplished with Consul or Salt/Ansible/Puppet that knows about the services.

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Really? In my experience, that's been tooling on top of Docker that makes that sort of declarative networking easy.

Docker has evolved beyond just running docker containers. I don't have any experience with it, but: https://docs.docker.com/docker-cloud/apps/service-links/

That's the issue here, you don't have any experience with it. Like most features in Docker, this one doesn't work as advertised.

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