Docker Swarm is definitely not production ready. Try to run any service that requires communication among nodes and you will agree. It works fine for web server

Docker Swarm is definitely not production ready. Try to run any service that requires communication among nodes and you will agree. It works fine for web servers, but that is about it. DC/OS is emerging as the go-to way to deploy docker containers at scale in complex service combinations. It 'just works' with one simple config per service.