Support fundamental VNF lifecycle management in Tacker

https://blueprints.launchpad.net/tacker/+spec/support-fundamental-lcm

This specification describes APIs of fundamental VNF lifecycle management based on ETSI NFV-SOL specification.

ETSI specifications within the NFV Architecture Framework [1] describe the main aspects of NFV development and usage based on the industry needs, feedback from SDN/NFV vendors and telecom operators. These specifications include the REST API and data model architecture which is used by NFV users and developers in related products.

Problem description

Support of key ETSI NFV specifications will significantly reduce efforts for Tacker integration into telecom production networks and also will simplify further development and support of future standards.

In the former release, we have added limited support of VNF lifecycle management as defined in ETSI NFV SOL 002 [2] and SOL 003 [3]. Tacker should support more APIs and attributes to compliant ETSI NFV SOL specification and expand a wide range of use cases.

Proposed change

The operations provided through new APIs in this specification are below.

• support additional APIs:

  • Notification endpoint (GET)

  • VNF LCM operation occurrences (GET)

The operations provided through additional attributes in this specification are below.

• support additional attributes:

  • Individual VNF LCM operation occurrence (GET)

• support filtering:

  • Subscriptions (POST, GET)

  • Individual subscription (GET)

1) Flow of Notification endpoint (GET)

The procedure consists of the following steps as illustrated in the above sequence:

1. The Client sends a Create Subscription request.

2. VNFM sends Notification to test the notification endpoint obtained from Create Subscription request.

3. The Client returns a 204 No Content response to indicate success.

4. VNFM returns a 201 Created response.

2) Flow of VNF LCM operation occurrence (GET)

The procedure consists of the following steps as illustrated in the above sequence:

1. The Client sends a GET request to the “VNF LCM operation occurrences” resource and can use attribute-based filtering expression that follows clause 5.2 of ETSI GS NFV SOL13 [4].

2. VNFM returns a response that includes zero or more data structures of type “VnfLcmOpOcc” in the payload body.

3) Flow of individual VNF LCM operation occurrences (GET)

1. The Client sends a GET request to the “Individual VNF LCM operation occurrence” resource, addressed by the appropriate VNF LCM operation occurrence identifier in its resource URI.

2. VNFM returns a 200 OK response to the client, and includes one data structure of type “VnfLcmOpOcc” in the payload body. “grantId”, “changedExtConnectivity”, “_links > retry” and “_links > fail”attribute is newly supported in Wallaby version.

4) Flow of Subscriptions (POST)

1. The Client sends a POST request to the “Subscriptions” resource including in the payload body a data structure of type “LccnSubscriptionRequest”. That data structure contains filtering criteria and a client side URI to which the VNFM will subsequently send notifications about events that match the filter. “filter > vnfInstanceSubscriptionFilter” and “filter > operationStates” attribute is newly supported in Wallaby version.

2. VNFM returns a 201 Created response containing a data structure of type “LccnSubscription” representing the “Individual subscription” resource just created by the VNFM. “filter > vnfInstanceSubscriptionFilter” and “filter > operationStates” attribute is newly supported in Wallaby version.

5) Flow of Subscriptions (GET)

1. The Client sends a GET request to the resource representing the subscriptions.

2. VNFM returns a 200 OK response that contains zero or more representations of all existing subscriptions. “filter > vnfInstanceSubscriptionFilter” and “filter > operationStates” attribute is newly supported in Wallaby version.

6) Flow of Individual subscriptions (GET)

1. The Client sends a GET request to the resource representing the individual subscription.

2. VNFM returns a 200 OK response that contains a representation of that individual subscription. “filter > vnfInstanceSubscriptionFilter” and “filter > operationStates” attribute is newly supported in Wallaby version.

Alternatives

None

Data model impact

Modify following tables in current Tacker database. The corresponding schemas are detailed below:

vnf_lcm_op_occs:

grant_id varchar(36)
changed_ext_connectivity json

vnf_lcm_filters:

vnfd_ids MEDIUMBLOB
vnf_products_from_providers json
vnf_provider VARBINARY(255)
vnf_product_name vnf_product_name
vnf_software_version VARBINARY(255)
vnfd_versions MEDIUMBLOB
vnfd_versions_len int
vnf_instance_ids MEDIUMBLOB
vnf_instance_ids_len int
vnf_instance_names MEDIUMBLOB
vnf_instance_names_len int
operation_states MEDIUMBLOB
operation_states_len int

REST API impact

A) Support new APIs

The following APIs will be added. These attributes are based on ETSI NFV SOL002 [2] and SOL003 [3].

The flow of the Subscriptions API is enhanced by a new API. The notification endpoint API allows the server to test the notification endpoint that is provided by the client during subscription.

• Name: Notification endpoint

  Description: The method allows the server to test the notification endpoint that is provided by the client.

  Method type: GET

  URL for the resource: The resource URI is provided by the client when creating the subscription.

  Response:

  Data type	Cardinality	Response Codes	Description
  n/a	n/a	Success 204 Error 4xx/ 5xx	The notification endpoint has been tested successfully.

Note: If this API returns an error response, the Subscriptions API that triggers it will return a 400 error response.

• Name: VNF LCM operation occurrence

  Description: Request VNF lifecycle management operation occurrence

  Method type: GET

  URL for the resource: /vnflcm/v1/vnf_lcm_op_occs

  URI query parameters supported by the GET method:

  URI query parameter	Cardinality	Support in Wallaby
  filter	0..1	Yes
  all_fields	0..1	Yes
  fields	0..1	Yes
  exclude_fields	0..1	Yes
  exclude_default	0..1	Yes
  nextpage_opaque_marker	0..1	No

  Response:

  Data type	Cardinality	Response Codes	Description
  VnfLcmOpOcc	1	Success 200 Error 4xx	Status information for zero or more VNF lifecycle management operation occurrences has been queried successfully.

  Attribute name	Data type	Cardinality	Supported in Wallaby
  id	Identifier	1	Yes
  operationState	LcmOperationStateType	1	Yes
  stateEnteredTime	DateTime	1	Yes
  startTime	DateTime	1	Yes
  vnfInstanceId	Identifier	1	Yes
  grantId	Identifier	1	Yes
  operation	LcmOperationType	1	Yes
  isAutomaticInvocation	Boolean	1	Yes
  operationParams	Object	1	Yes
  isCancelPending	Boolean	0..N	No
  cancelMode	CancelModeType	0..N	No
  error	ProblemDetails	0..N	Yes
  resourceChanges	Structure(inlined)	0..1	Yes
  changedInfo	VnfInfoModifications	0..N	Yes
  changedExtConnectivity	ExtVirtualLinkInfo	0..1	Yes
  _links	Structure (inlined)	1	Yes
  >self	Link	1	Yes
  >vnfInstance	Link	1	Yes
  >grant	Link	0..1	Yes
  >cancel	Link	0..1	No
  >retry	Link	0..1	Yes
  >rollback	Link	0..1	Yes
  >fail	Link	0..1	Yes

B) Support new attributes of implemented APIs

The following attributes of REST APIs will be added. These attributes are based on ETSI NFV SOL002 [2] and SOL003 [3]. Details of APIs implemented in previous versions are described in NFV Orchestration API v1.0 [5].

B-1) Support additional attributes

• Name: Query VNF occurrence

  Description: Request individual VNF lifecycle management operation occurrence by its id

  Method type: GET

  URL for the resource: /vnflcm/v1/vnf_lcm_op_occs/{vnfLcmOpOccId}

  Resource URI variables for this resource::

  Name	Description
  vnfLcmOpOccId	Identifier of a VNF lifecycle management operation occurrence.

  Response:

  Data type	Cardinality	Response Codes	Description
  VnfLcmOpOcc	1	Success 200 Error 4xx	The operation has completed successfully.

  Attribute name	Data type	Cardinality	Supported in Wallaby
  grantId	Identifier	0..1	Yes
  _links	Structure (inlined)	1	Yes
  >retry	Link	0..1	Yes
  >fail	Link	0..1	Yes

B-2) Support filtering

• Name: List subscriptions

  Description: Request list of all existing subscriptions to VNF lifecycle management

  Method type: GET

  URL for the resource: /vnflcm/v1/subscriptions

  URI query parameters supported by the GET method:

  URI query parameter	Cardinality	Description	Supported in Wallaby
  filter	0..1	Filter to list subscriptions	Yes

  Response:

  Data type	Cardinality	Response Codes	Description
  LccnSubscription	0..N	Success 200 Error 4xx/ 5xx	The operation has completed successfully.

  Attribute name	Data type	Cardinality	Supported in Wallaby
  filter	LifecycleChangeNotificationsFilter	0..1	Yes
  vnfInstanceSubscriptionFilter	VnfInstanceSubscriptionFilter	0..1	Yes
  >operationStates	LcmOperationStateType	0..N	Yes

• Name: Subscriptions

  Description: Subscribe to notifications related to VNF lifecycle management

  Method type: POST

  URL for the resource: /vnflcm/v1/subscriptions

  Request:

  Data type	Cardinality		Description
  LccnSubscriptionRequest	1		Parameters for the Subscription.

  Attribute name	Data type	Cardinality	Supported in Wallaby
  filter	LifecycleChangeNotificationFilter	0..1	Yes
  callbackUri	Uri	1	Yes
  authentication	SubscriptionAuthentication	0..1	Yes

  Response:

  Data type	Cardinality	Response Codes	Description
  LccnSubscription	n/a	Success 201 Redirection 303 Error 4xx	The subscription has been created successfully.

  Attribute name	Data type	Cardinality	Supported in Wallaby
  filter	LifecycleChangeNotificationsFilter	0..1	Yes
  >vnfInstanceSubscriptionFilter	VnfInstanceSubscriptionFilter	0..1	Yes
  >operationStates	LcmOperationStateType	0..N	Yes

• Name: Query subscriptions

  Description: Request individual subscription resource by its id

  Method type: GET

  URL for the resource: /vnflcm/v1/subscriptions/{subscriptionId}

  Resource URI variables for this resource::

  Name	Description
  subscriptionId	Identifier of the subscriptions.

  Response:

  Data type	Cardinality	Response Codes	Description
  LccnSubscription	1	Success 200 Error Error 4xx/ 5xx	The operation has completed successfully.

  Attribute name	Data type	Cardinality	Supported in Wallaby
  filter	LifecycleChangeNotificationsFilter	0..1	Yes
  >vnfInstanceSubscriptionFilter	VnfInstanceSubscriptionFilter	0..1	Yes
  >operationStates	LcmOperationStateType	0..N	Yes

Security impact

None

Notifications impact

This specification enhances APIs related to subscriptions and notification for VNF lifecycle management.

Other end user impact

• Add new OSC commands in python-tackerclient to invoke VNF LCM operation occurrence and Query VNF occurrence.

• A client must be configured to return 204 for the request of notification endpoint (GET).

Performance impact

None

Other deployer impact

The previously created VNFs will not be allowed to be managed using the newly introduced APIs.

Developer impact

None

Implementation

Assignee(s)

Primary assignee:

Hirofumi Noguchi <hirofumi.noguchi.rs@hco.ntt.co.jp>

Other contributors:

Keiko Kuriu <keiko.kuriu.wa@hco.ntt.co.jp>

Work Items

• Add new REST APIs and supported attributes to Tacker-server.

• Make changes in python-tackerclient to add new OSC commands for calling APIs of VNF LCM operation occurrence and Query VNF occurrence.

• Add new unit and functional tests.

• Change API Tacker documentation.

Dependencies

None

Testing

Unit and functional test cases will be added for VNF lifecycle management of VNF instances.

Documentation Impact

Complete user guide will be added to explain how to invoke VNF lifecycle management of VNF instances with examples.

References

[1]

https://www.etsi.org/technologies-clusters/technologies/NFV

[2] (1,2,3)

https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/002/02.06.01_60/gs_nfv-sol002v020601p.pdf (Chapter 5: VNF Lifecycle Management interface)

[3] (1,2,3)

https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/003/02.06.01_60/gs_nfv-sol003v020601p.pdf (Chapter 5: VNF Lifecycle Management interface)

[4]

https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/013/02.06.01_60/gs_nfv-sol013v020601p.pdf (Chapter 5: Result set control)

[5]

https://docs.openstack.org/api-ref/nfv-orchestration/v1/index.html#virtualized-network-function-lifecycle-management-interface-vnf-lcm