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This feature of openstackdocstheme means that we'll always link to the corresponding branch of another project (i.e. latest links to latest, but train links to train, &c.) https://docs.openstack.org/openstackdocstheme/latest/#external-link-helper Change-Id: If94115f87af3689413405f3283be7fb197fab058
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33 lines
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============
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Introduction
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============
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The OpenStack Orchestration service, a tool for orchestrating clouds,
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automatically configures and deploys resources in stacks. The deployments can
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be simple, such as deploying WordPress on Ubuntu with an SQL back end, or
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complex, such as starting a server group that auto scales by
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starting and stopping using real-time CPU loading information from the
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Telemetry service.
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Orchestration stacks are defined with templates, which are non-procedural
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documents. Templates describe tasks in terms of resources, parameters, inputs,
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constraints, and dependencies. When the Orchestration service was originally
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introduced, it worked with AWS CloudFormation templates, which are in the JSON
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format.
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The Orchestration service also runs Heat Orchestration Template (HOT)
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templates that are written in YAML. YAML is a terse notation that loosely
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follows structural conventions (colons, returns, indentation) that are similar
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to Python or Ruby. Therefore, it is easier to write, parse, grep, generate
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with tools, and maintain source-code management systems.
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Orchestration can be accessed through a CLI and RESTful queries.
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The Orchestration service provides both an OpenStack-native REST API and a
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CloudFormation-compatible Query API. The Orchestration service is also
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integrated with the OpenStack dashboard to perform stack functions through
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a web interface.
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For more information about using the Orchestration service through the
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command line, see the :python-heatclient-doc:`Heat Command-Line Interface
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reference <#openstackclient-command-line>`.
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