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Heat provides a declarative user interface to OpenStack resources. You give it a template and it figures out how to create all of the resources in the right order (if they are dependent on each other) and does it for you. You can update the stack with a modified template, or delete it altogether, and it figures out how to do that for you too.

In general it supports most resource types provided by OpenStack APIs (see the full list).

The Zun service provides an OpenStack API for spinning up (Linux) containers, and is supported by Heat.