Weâre releasing Docker 1.9 â and itâs a big one. Docker Swarm and multi-host networking are production-ready, Docker Engine has a new volume management system, and Docker Compose has much better support for multiple environments. These in combination establish the foundation for scaling your distributed apps in production.
Containerization is changing how you build infrastructure, and you need to use the right tools for the job. Docker Swarm turns your infrastructure into a single pool of resources for running your distributed apps, but all of the containers that are part of those apps need managing somehow. And they all probably need to talk to each other. And some of them probably need to store data somewhere. In a world where a container could be running on any host in your infrastructure, this is a difficult thing to manage.
Read more at the Docker blog.