A stack is a complete environment that runs your pipelines, including the operating system and container technology.
Docker Workflows Stack
The Docker Workflows stack is built on Docker. It currently serves as the production stack powering Wercker.
Docker offers tools to create your own Docker images, which you can publish to any Docker registry. Wercker then allows you to leverage these images as Containers inside of your Wercker pipelines to create complex Workflows.
If you previously used our classic stack (based on LXC rather than Docker), see our migration guide to move to the Docker Workflows stack.