49 lines
2.2 KiB
XML
49 lines
2.2 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="orchestration-service">
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<title>Orchestration module concepts</title>
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<para>The Orchestration module provides a template-based
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orchestration for describing a cloud application, by running
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OpenStack API calls to generate running cloud applications. The
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software integrates other core components of OpenStack into a
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one-file template system. The templates allow you to create most
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OpenStack resource types, such as instances, floating IPs,
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volumes, security groups and users. It also provides advanced
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functionality, such as instance high availability, instance auto-scaling,
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and nested stacks. This enables OpenStack core projects to receive a larger
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user base.</para>
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<para>The service enables deployers to integrate with the
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Orchestration module directly or through custom plug-ins.</para>
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<para>The Orchestration module consists of the following
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components:</para>
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<variablelist>
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<varlistentry>
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<term><code>heat</code> command-line client</term>
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<listitem><para>A CLI that communicates with the heat-api to run AWS
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CloudFormation APIs. End developers can directly use the Orchestration
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REST API.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><code>heat-api</code> component</term><listitem><para>An
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OpenStack-native REST API that processes API requests by sending them to
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the heat-engine over Remote Procedure Call (RPC).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><code>heat-api-cfn</code> component</term> <listitem><para>An AWS
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Query API that is compatible with AWS CloudFormation. It processes
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API requests by sending them to the heat-engine over
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RPC.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><code>heat-engine</code></term>
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<listitem><para>Orchestrates the launching of templates and provides
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events back to the API consumer.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</section>
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