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Glossary
- API server
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HTTP REST API service for heat.
- CFN
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An abbreviated form of "AWS CloudFormation".
- constraint
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Defines valid input
parametersfor atemplate. - dependency
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When a
resourcemust wait for another resource to finish creation before being created itself. Heat adds an implicit dependency when a resource references another resource or one of itsattributes <resource attribute>. An explicit dependency can also be created by the user in the template definition. - environment
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Used to affect the run-time behavior of the template. Provides a way to override the default resource implementation and parameters passed to Heat. See
Environments. - Heat Orchestration Template
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A particular
templateformat that is native to Heat. Heat Orchestration Templates are expressed in YAML and are not backwards-compatible with CloudFormation templates. - HOT
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An acronym for "
Heat Orchestration Template". - input parameters
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See
parameters. - Metadata
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May refer to
Resource Metadata,Nova Instance metadata, or theMetadata service. - Metadata service
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A Compute service that enables virtual machine instances to retrieve instance-specific data. See
Nova Metadata service documentation <user/metadata.html#metadata-service>. - multi-region
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A feature of Heat that supports deployment to multiple regions.
- nested resource
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A
resourceinstantiated as part of anested stack. - nested stack
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A
templatereferenced by URL inside of another template. Used to reduce redundant resource definitions and group complex architectures into logical groups. - Nova Instance metadata
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User-provided key:value pairs associated with a Compute Instance. See Instance-specific data (OpenStack Operations Guide).
- OpenStack
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Open source software for building private and public clouds.
- orchestrate
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Arrange or direct the elements of a situation to produce a desired effect.
- outputs
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A top-level block in a
templatethat defines what data will be returned by a stack after instantiation. - parameters
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A top-level block in a
templatethat defines what data can be passed to customise a template when it is used to create or update astack. - provider resource
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A
resourceimplemented by aprovider template. The parent resource's properties become thenested stack's <nested stack>parameters. - provider template
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Allows user-definable
resource providers <resource provider>to be specified vianested stacks <nested stack>. The nested stack'soutputsbecome the parent stack'sattributes <resource attribute>. - resource
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An element of OpenStack infrastructure instantiated from a particular
resource provider. See alsonested resource. - resource attribute
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Data that can be obtained from a
resource, e.g. a server's public IP or name. Usually passed to another resource'sproperties <resource property>or added to the stack'soutputs. - resource group
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A
resource providerthat creates one or more identically configuredresources <resource>ornested resources <nested resource>. - Resource Metadata
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A
resource propertythat contains CFN-style template metadata. See AWS::CloudFormation::Init (AWS CloudFormation User Guide) - resource plugin
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Python code that understands how to instantiate and manage a
resource. See Heat Resource Plugins (OpenStack wiki). - resource property
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Data utilized for the instantiation of a
resource. Can be defined statically in atemplateor passed in asinput parameters <parameters>. - resource provider
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The implementation of a particular resource type. May be a
resource pluginor aprovider template. - stack
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A collection of instantiated
resources <resource>that are defined in a singletemplate. - stack resource
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A
resource providerthat allows the management of anested stackas aresourcein a parent stack. - template
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An orchestration document that details everything needed to carry out an
orchestration <orchestrate>. - template resource
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See
provider resource. - user data
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A
resource propertythat contains a user-provided data blob. User data gets passed to cloud-init to automatically configure instances at boot time. See alsoNova User data documentation <user/metadata.html#user-provided-data>. - wait condition
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A
resource providerthat provides a way to communicate data or events from servers back to the orchestration engine. Most commonly used to pause the creation of thestackwhile the server is being configured.