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Revision as of 23:29, 17 February 2013
Glance API Specification
Glance <=> Nova Integration requires these components:
- Glance - VM Image Management Service
- Parallax - Image Registry service
- Teller - Image Delivery service
- Client Classes
- `glance.client.GlanceClient` - A client used in Nova to query Glance about images
- `glance.client.ParallaxClient` - A client tool for querying Parallax about available images
- `glance.client.TellerClient` - A client tool for the chunked retrieval of an image
- `glance.client.GlanceClient` - A client used in Nova to query Glance about images
Contents
- 1 Glance API Specification
- 1.1 Parallax API Commands
- 1.2 Teller API Commands
Parallax API Commands
This section describes the Parallax REST API for creating, listing, modifying, and deleting image metadata.
Fetch id/name basic information on all public images
GET http://parallax.openstack.org/images
Returns a mapping containing a list of mappings containing details information about the public images encoded in JSON:
{ "images": [ {"id": 1, "name": "My Image 1"}, {"id": 2, "name": "My Image 2"}, ] }
Fetch detailed information on all public images
GET http://parallax.openstack.org/images/detail
Returns a mapping containing a list of mappings containing details information about the public images encoded in JSON:
{ "images": [ { "id": 1, "name": "My Image", "status": "available", "image_type": "kernel" "is_public": true, "properties": { "mykey": "myvalue" }, "files": [ { "location": "swift://user:passwd@acct/container/obj.tar.gz.0", "size": 101 } ] } ] }
Notes
The `properties` element is a mapping of custom key/value pairs the image may have saved with it.
The `files` element is a list of mappings containing the chunks comprising an image along with the chunk's size
Fetch a single image's metadata
GET http://parallax.openstack.org/images/<ID>
Returns the image's metadata encoded in JSON:
{ "image": { "id": 1, "name": "My Image", "status": "available", "image_type": "kernel" "is_public": true, "properties": { "mykey": "myvalue" }, "files": [ { "location": "swift://user:passwd@acct/container/obj.tar.gz.0", "size": 101 } ] } }
Notes
The reason the returned dict contains only a single element, 'image', is for XML conversion purposes, where the root element will be `<image>` and not the root XML namespace.
The `properties` element is a mapping of custom key/value pairs the image may have saved with it.
The `files` element is a list of mappings containing the chunks comprising an image along with the chunk's size
Exceptions
404:: Image was not found
Register/create a new image
POST http://parallax.openstack.org/images
The body of the request shall be a JSON encoded mapping of the image's metadata:
{ "image": { "name": "My Image", "status": "available", "image_type": "kernel" "is_public": true, "properties": { "mykey": "myvalue" }, "files": [ { "location": "swift://user:passwd@acct/container/obj.tar.gz.0", "size": 101 } ] } }
The returned response, is successful, will be a JSON encoded mapping of the newly-created image in Parallax, including a populated `id` column with the new image's internal identifier:
{ "image": { "id": 1, "name": "My Image", "status": "available", "image_type": "kernel" "is_public": true, "properties": { "mykey": "myvalue" }, "files": [ { "location": "swift://user:passwd@acct/container/obj.tar.gz.0", "size": 101 } ] } }
Notes
The reason the body dict and result dict contains only a single element, 'image', is for XML conversion purposes, where the root element will be `<image>` and not the root XML namespace.
The `properties` element is a mapping of custom key/value pairs the image may have saved with it.
The `files` element is a list of mappings containing the chunks comprising an image along with the chunk's size
Update an existing image's metadata
PUT http://parallax.openstack.org/images/<ID>
The body of the request shall be a JSON encoded mapping of the image's metadata:
{ "image": { "id": 2349823, "name": "My Image", "status": "disabled", "image_type": "kernel" "is_public": true, "properties": { "mykey": "myvalue" }, "files": [ { "location": "swift://user:passwd@acct/container/obj.tar.gz.0", "size": 101 } ] } }
The returned response, if successful, will be a JSON encoded mapping of the updated image metadata in Parallax:
{ "image": { "id": 2349823, "name": "My Image", "status": "disabled", "image_type": "kernel" "is_public": true, "metadata": { "mykey": "myvalue" }, "files": [ { "location": "swift://user:passwd@acct/container/obj.tar.gz.0", "size": 101 } ] } }
Notes
The reason the body dict and result dict contains only a single element, 'image', is for XML conversion purposes, where the root element will be `<image>` and not the root XML namespace.
The `properties` element is a mapping of custom key/value pairs the image may have saved with it.
The `files` element is a list of mappings containing the chunks comprising an image along with the chunk's size
Exceptions
404:: Image was not found
Delete an existing image from the registry
DELETE http://parallax.openstack.org/images/<ID>
The body of the request will be ignored.
Exceptions
404:: Image was not found
Teller API Commands
This section describes the Teller REST API.
Fetch an Image
GET http://teller.openstack.org/images/<ID>
Returns the virtual machine image data as response body.
Exceptions
404:: Image was not found
Store an Image
POST http://teller.openstack.org/images/<ID>
The body of the POST request shall be a mime-encoded blob of data representing the image to be stored.
Note: All this does is store the raw image data in Teller's backend. If you are responsible for storing the metadata about the image, you should do that with a similar call to Parallax's API.
Immediately returns a mapping of image information indicating status of the image:
{ 'image': { 'id': identifier for image, 'status': 'pending' } }
Update an Image
There is no operation for updating an image. All images are immutable once created.
Delete an Image
DELETE http://teller.openstack.org/images/<ID>
Returns 200 OK on success
Returns 404 when image with URI does not exist