nova/api-guide/source/links_and_references.rst
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====================
Links and references
====================
Often resources need to refer to other resources. For example, when
creating a server, you must specify the image from which to build the
server. You can specify the image by providing an ID or a URL to a
remote image. When providing an ID, it is assumed that the resource
exists in the current OpenStack deployment.
**Example: ID image reference: JSON request**
.. code::
{
"server":{
"flavorRef":"http://openstack.example.com/openstack/flavors/1",
"imageRef":"http://openstack.example.com/openstack/images/70a599e0-31e7-49b7-b260-868f441e862b",
"metadata":{
"My Server Name":"Apache1"
},
"name":"new-server-test",
"personality":[
{
"contents":"ICAgICAgDQoiQSBjbG91ZCBkb2VzIG5vdCBrbm93IHdoeSBpdCBtb3ZlcyBpbiBqdXN0IHN1Y2ggYSBkaXJlY3Rpb24gYW5kIGF0IHN1Y2ggYSBzcGVlZC4uLkl0IGZlZWxzIGFuIGltcHVsc2lvbi4uLnRoaXMgaXMgdGhlIHBsYWNlIHRvIGdvIG5vdy4gQnV0IHRoZSBza3kga25vd3MgdGhlIHJlYXNvbnMgYW5kIHRoZSBwYXR0ZXJucyBiZWhpbmQgYWxsIGNsb3VkcywgYW5kIHlvdSB3aWxsIGtub3csIHRvbywgd2hlbiB5b3UgbGlmdCB5b3Vyc2VsZiBoaWdoIGVub3VnaCB0byBzZWUgYmV5b25kIGhvcml6b25zLiINCg0KLVJpY2hhcmQgQmFjaA==",
"path":"/etc/banner.txt"
}
]
}
}
**Example: Full image reference: JSON request**
.. code::
{
"server": {
"name": "server-test-1",
"imageRef": "b5660a6e-4b46-4be3-9707-6b47221b454f",
"flavorRef": "2",
"max_count": 1,
"min_count": 1,
"networks": [
{
"uuid": "d32019d3-bc6e-4319-9c1d-6722fc136a22"
}
],
"security_groups": [
{
"name": "default"
},
{
"name": "another-secgroup-name"
}
]
}
}
For convenience, resources contain links to themselves. This allows a
client to easily obtain rather than construct resource URIs. The
following types of link relations are associated with resources:
- A ``self`` link contains a versioned link to the resource. Use these
links when the link is followed immediately.
- A ``bookmark`` link provides a permanent link to a resource that is
appropriate for long term storage.
- An ``alternate`` link can contain an alternate representation of the
resource. For example, an OpenStack Compute image might have an
alternate representation in the OpenStack Image service.
.. note:: The ``type`` attribute provides a hint as to the type of
representation to expect when following the link.
**Example: Server with self links: JSON**
.. code::
{
"server":{
"id":"52415800-8b69-11e0-9b19-734fcece0043",
"name":"my-server",
"links":[
{
"rel":"self",
"href":"http://servers.api.openstack.org/v2.1/servers/52415800-8b69-11e0-9b19-734fcece0043"
},
{
"rel":"bookmark",
"href":"http://servers.api.openstack.org/servers/52415800-8b69-11e0-9b19-734fcece0043"
}
]
}
}
**Example: Server with alternate link: JSON**
.. code::
{
"image" : {
"id" : "52415800-8b69-11e0-9b19-734f5736d2a2",
"name" : "My Server Backup",
"links": [
{
"rel" : "self",
"href" : "http://servers.api.openstack.org/v2.1/images/52415800-8b69-11e0-9b19-734f5736d2a2"
},
{
"rel" : "bookmark",
"href" : "http://servers.api.openstack.org/images/52415800-8b69-11e0-9b19-734f5736d2a2"
},
{
"rel" : "alternate",
"type" : "application/vnd.openstack.image",
"href" : "http://glance.api.openstack.org/1234/images/52415800-8b69-11e0-9b19-734f5736d2a2"
}
]
}
}