Docker swarm

What is Docker swarm used for?

This SO post is pretty useful (albeit by a Kubernetes guy):

https://stackoverflow.com/questions/27640633/docker-swarm-kubernetes-mesos-core-os-fleet

TLDR

Swarm is an effort by Docker to extend the existing Docker API to make a cluster of machines look like a single Docker API. Fundamentally, our experience at Google and elsewhere indicates that the node API is insufficient for a cluster API. You can see a bunch of discussion on this here: https://github.com/docker/docker/pull/8859 and here: https://github.com/docker/docker/issues/8781

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