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The rescue extension lets you put a server into a "rescue" status when the virtual instance will be replaced with a "rescue" image and have its existing drive attached as a second disk so that a root user can log in and troubleshoot problems with the virtual server.
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To put a server into "rescue" state, you do not have to be an administrator. You must have configured a rescue image for use on your cloud.
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.. Are there any pre-requisites prior to using it such as special hardware or configuration?
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To put a server into "rescue" state, you do not have to be an administrator. The only requirement is that the base image used to build your instance must still be available.
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To obtain current information the extensions available to you, issue an EXTENSION query on the OpenStack system where it is installed, such as http://mycloud.com/v1.1/tenant/extensions.
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This extension to the OpenStack Compute API enables rescue of running instances.
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To support these new actions, the extension also issues new (faults, headers, resources, states, you name it.)
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To support these new actions, the extension also issues new states.
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List the actions each in a section. Enter "None" if there are no changes.
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Include the response codes, transitions if applicable, and XML and JSON examples.
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Changes to the Cloud Servers Specification
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List the specific changes to the API. For example:
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In section 4.1.1 (List Servers) of the Cloud Servers Specification: Examples 4.1 and 4.2 should be replaced with Example 2.7 and Example 2.8 below.
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Provide examples in XML and JSON
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A new action added to the 4.3 Server Actions section.
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============= ==================
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POST /servers/id/rescue
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============= ==================
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Normal Response Code(s): 202
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Error Response Code(s): computeFault (400, 500, …), serviceUnavailable (503), unauthorized (401), forbidden (403), badRequest (400), badMethod (405), overLimit (413), itemNotFound (404), badMediaType (415), buildInProgress (409)
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Status Transition: ACTIVE -> RESCUING -> ACTIVE
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This operation places the server into RESCUING status.
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