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Copyright 2011-2012 OpenStack Foundation
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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=================
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Heat architecture
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=================
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Heat is a service to orchestrate multiple composite cloud applications using
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the .. _AWS CloudFormation:
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http://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/Welcome.html?r=7078
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template format, through both an OpenStack-native REST API and a
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CloudFormation-compatible Query API.
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Detailed description
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~~~~~~~~~~~~~~~~~~~~
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What is the purpose of the project and vision for it?
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*Heat provides an AWS CloudFormation implementation for OpenStack that
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orchestrates an AWS CloudFormation template describing a cloud application by
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executing appropriate OpenStack API calls to generate running cloud
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applications.*
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Describe the relevance of the project to other OpenStack projects and the
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OpenStack mission to provide a ubiquitous cloud computing platform:
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*The software integrates other core components of OpenStack into a one-file
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template system. The templates allow creation of most OpenStack resource types
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(such as instances, floating IPs, volumes, security groups and users), as well
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as some more advanced functionality such as instance high availability,
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instance autoscaling, and nested stacks. By providing very tight integration
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with other OpenStack core projects, all OpenStack core projects could receive
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a larger user base.*
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*Currently no other CloudFormation implementation exists for OpenStack. The
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developers believe cloud developers have a strong desire to move workloads
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from AWS to OpenStack deployments. Given the missing gap of a well-implemented
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and integrated CloudFormation API in OpenStack, we provide a high quality
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implementation of this gap improving the ubiquity of OpenStack.*
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Heat services
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~~~~~~~~~~~~~
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The developers are focused on creating an OpenStack style project using
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OpenStack design tenets, implemented in Python. We have started with full
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integration with keystone. We have a number of components.
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As the developers have only started development in March 2012, the
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architecture is evolving rapidly.
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heat
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----
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The heat tool is a CLI which communicates with the heat-api to execute AWS
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CloudFormation APIs. End developers could also use the heat REST API directly.
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heat-api
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--------
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The heat-api component provides an OpenStack-native REST API that processes
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API requests by sending them to the heat-engine over RPC.
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heat-api-cfn
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------------
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The heat-api-cfn component provides an AWS Query API that is compatible with
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AWS CloudFormation and processes API requests by sending them to the
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heat-engine over RPC.
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heat-engine
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-----------
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The heat-engine's main responsibility is to orchestrate the launching of
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templates and provide events back to the API consumer.
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The templates integrate well with .. _Puppet:
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https://s3.amazonaws.com/cloudformation-examples/IntegratingAWSCloudFormationWithPuppet.pdf
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and .. _Chef:
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http://www.full360.com/2011/02/27/integrating-aws-cloudformation-and-chef.html
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