ASD Onboarding and Orchestration PoC

Target release: Jakarta

Note: this is based on the current ASD concept understanding. This would be a PoC use case to prove ASD usage (onboarding/distribution) and interactions of southbound interfaces (e.g., Kubernetes)

Goals:

ASD onboarding to SDC, including:
- Allow SDC designers to customize/add custom properties ? e.g., defining input parameters, adding custom properties...
- Store original vendor packages
- Store enhanced ASD descriptors
- Transforming onboarding ASD packages into internal ASD model
  - use the ASD model as SDC internal model (TBD_
  - leverage SDC Multi Model support feature, creation of distinct notification for ASD, ETSI and HEAT...
ASD integration with Service Model in SDC
SDC distribution to ONAP Runtime components
- Store internal ASD Descriptors in Catalog Manager
- Store Helm Charts in Helm Chart Repository
- Store Images in Image Repository
Orchestration based on internal ASD-model
- Orchestrators (Helm v3) get Helm Chart
- demonstrate how internal ASD and Helm Charts are processed by the orchestrator
- Resolve K8 resources based on input parameters and Cloud Artifacts
- send requests to Kubernetes

Helm 3 Interaction between Helm Client and Kubernetes API Server

Helm 3 has a client-only architecture with the client. In Helm 3, the client interacts directly with the Kubernetes API server The in-cluster server Tiller is removed.

ASD Onboarding and Orchestration PoC Architecture

The architecture conforms to the above Helm3 client-only architecture.

The following diagram depicts ASD onboarding and orchestration PoC.

Note:

ETSI SOL001-based model orchestration leveraging Helm Processor needs to be sort out further.
Helm Processor realization (e.g., MultiCloud??, EMCO?? others??) will be discussed
Placement realization (e.g., OOF?? others??) will be discussed

helm install --dry-run or --debug vs. helm template

helm install –-dry-run or --debug

helm template

Sequence Steps:

#	Actor	Action
1	Designer	Design ASD and/or CBA
2	Designer / SDC	Onboard SOL004-based ASD package (could include CBA) Design Resource & Compose Resources into Service Enhance ASD (ASD’)
3	SDC	Distribute Service CSAR to ONAP runtime components (SO, AAI, SDNC, etc.) Distribute ASD + ASD’ to Catalog Manager Distribute Helm Charts to Helm Repository (centralized) Distribute Images to Image Repository (centralized)
4	SO Client	Start CNF service creation
5	SO	S1: create service instance to AAI S2: resolve parameters S3: CDS returns assignment Process model & decide flows (in this case, Helm Orchestrator) Delegate Resource-level orchestration to Helm Orchestrator Pass ASD’ or its reference with input (resolved) parameters
6	CNF Manager	Retrieve ASD’ (and/or ASD : TBD) from Catalog Manager
7	CNF Manager	Retrieve Helm Charts from Helm Repository
	CNF Manager	Transform ASD cloud artifacts with parameters to K8S resource description (e.g., helm template or helm install --dry-run) Get additional data as needed
8	CNF Manager	Get placement information by passing K8 resources + ASD' + additional data to the Placement
9	Placement	make a placement decision based on input data & return it
10	CNF Manager	Send CNF creation request (with cluster id, parameter, cloud artifacts) to K8S (e.g., helm install ...)
11	k8S	Retrieve images from Image Repository and process for CNF
12	SO	Update CNF to AAI

~~Onboard package – this will ingest the package, and verify the integrity and authenticity of the package etc.~~
1. ~~SDC supports ASD packages in addition to ETSI packages~~
2. ~~both ASD and ETSI packages conform to ETSI SOL004~~
3. ~~SDC transforms vendor ASD to internal ASD (proposal: ASD specification = internal ASD specification)~~
~~Store relevant information in repo – for internal organization and making the package available for deployment.~~
1. ~~SDC creates Service CSAR for the ASD AND ETSI VNF/CNFD~~
  1. ~~Service CSAR includes both vendor ASD and internal ASD~~
2. ~~Descriptors will be stored in the Catalog Manager Repository~~
3. ~~Helm Charts will be stored in the Helm Repository~~
4. ~~Images will be stored in the Image Repository~~
~~Receive deployment order, along with required parameters. The required parameters are the ones specified in the ASD under “lifecycleParameters”.~~
1. ~~SO receives incoming Service Requests and retrieves the corresponding Service Catalog~~
2. ~~So validates required parameters~~
~~Fetch descriptors from Service package.~~
1. ~~SO decomposes incoming Service Requests into Resources~~
2. ~~If the resource is for CNF and ASD-based models, SO follows the ASD orchestration path~~
3. ~~If the resource is for ETSI-based models, SO delegates its orchestration to SO NFVO or VFC~~
~~SO delegates ASD orchestration to the Helm Processor (Helm v3)~~
1. ~~SO passes Descriptor (ASD) information and required parameters (e.g., lifecycleParameters) to the Helm Processor~~
~~Helm V3 handles internal ASD-based NF or application~~
1. ~~Helm V3 retrieves Helm Charts from the Repository~~
2. ~~Using received parameters and default values already in the chart to construct the value files (custom yaml files and will be stored in the database).~~
3. ~~With this input, Helm performs a chart render; i.e., translates the charts into concrete K8S resources descriptions.~~
In the placement use case, the concrete K8S workload description (pod, daemonset, deployment, replicaset, statefulset, job, cronjobs, etc) and the ASD will be used by internal logic of orchestrator for placement decision.
~~Perform placement decision – the placement function can parse the workload descriptors and ASD and use that information to select the appropriate cluster.~~
~~Use Helm to install the application on a particular cluster with the values constructed in the Helm Processor~~
1. ~~Helm V3 does dry-run before real deployment; i.e., render templates with the right values~~
  1. ~~If generating the manifest and verifying the YAML file are only purpose, helm template can be considered~~
2. ~~If dry-run is satisfied, Helm V3 sends its requests to K8S~~

ASD-based CNF Orchestration Realization Scenario

The following process depicts the ASD-based CNF orchestration scenario.

ASD Package

The following diagram depicts ASD package, conforming to SOL004.

Note: the App (xApp, rApp) package structure will be added here once the specification is available. Most likely, xApp and rApp support is not part of the initial PoC.

ASD & Package Examples

For the ASD and Package examples, see the ASD & packaging examples.

A "Sample" Application Model in TOSCA (note: this is a work in progress (by Ericsson); to be refined further)

Based on the example of the ONAP webpage, https://wiki.onap.org/pages/viewpage.action?pageId=103422195

Some Underlying Data and Node Types

SDC Onboarding

SDC onboarding process will be enhanced to handle ASD.

Package Delivery: A vendor delivers an SOL004-based ASD package
Pre-Onboarding for validation: TBD (out of PoC scope)
Onboarding: SDC brings in and stores resources such as xNF, xApp and rApp into ONAP for later use in services.

Onboarding SDC Design Consideration (in progress)

SDC supports multiple models, e.g., SDC model, ETSI model, vendor/operator specific models
SDC supports onboarding, design and packaging of services/resources that adhere to any of the supported models instead of just the SDC model
SDC can extend its multiple models to handle ASD model
SDC supports translation between models where appropriate/wanted, e.g., translation of ASD model to SDC model

A type is added to the DB schema to define models (e.g., SDC model would be one instance, ETSI SO001 would be another, ASD would be another)
When adding node types, data types, etc. in SDC, they can be associated with one or more models
Id of the types must be set to ensure types with the same name can exist in different models

On creating a new service:
- Select the model applicable to the service
- Only resources from that model, or based on that model, can be used in designing the service
- Ensures, for example, that only ETSI types can be used when designing a ETSI NS
- Where non SDC model is selected, the topology template is constructed without any ONAP specific structuring
- Option to generate a service that is a mapping of the created (e.g. ETSI NS) service in the ONAP SDC model and using ONAP structure
  - This will be a separate service, but with the option to auto update as required
  - Automated generation for convenience, but creating as a separate service allows the user the opportunity to fine tune to address any gaps or short comings in the translation logic
Distribution: It will be possible to distinguish ONAP from non-ONAP services in the distribution notification

Onboarding a VSP:
- Select the model applicable to the VSP
- Validator used in onboarding is selected based on the specified model
- VF generated using the types from the specified model
- Where new types are defined in the csar, a new model is created which is specific to the csar
- Where ONAP model is selected, VF is import as today
- Where another model is selected, the VF is created using the types defined for that model, and using standard TOSCA structure (e.g. the substitutable as node type is preserved in the generated VF)
- Option to generate a VF that is a mapping of the created VF in the ONAP SDC model and structure (similar to what is proposed for services)

Onboarding Information Flow

SDC needs to support the following onboarding process.

Note: ASD package validation is not addressed here. TBD

ASD Packaging Onboarding Summary - a VSP model is created using an Onboarding ASD package

The onboarding ASD package is accessed by a Technology specialist/Asset manager.
An internal model is created in SDC with Metadata added.
The artifacts from the ASD package are transformed into onboarding artifacts during SDC onboarding
SDC transforms the ASD onboarding descriptor into an SDC internal descriptor
Optionally, License model files are added

Manual ASD VSP Creation Summary - an ASD VSP model is manually created

The Technology specialist/Asset manager initiates a manual VSP creation.
SDC is used to create an internal model with Metadata added.
The internal descriptor proprieties are updated. The vendor provided descriptor can specify attribute value limitations or ranges
The License Model Files are then added to the VSP
The License Model Files are then added to the VSP (Optional)

Create Resource - from a VSP

The ONAP Operator requests for a resource to be created from a VSP
An VSP is transformed into a resource model.
The SDC Internal descriptor properties are updated. Customized types during design time allows service providers to specify additional restrictions on onboarded parameters.
1. For example a vendor specified attribute might have allowed values
2. customized types would restrict certain allowed values.
The License Model Files are then added to the VSP
The License Model Files are then added to the VSP (Optional)

Create Resource - Manual Creation of ASD Resource

The operator invokes the manual creation of an ASD resource. An internal ASD model is created with Metadata added.
In SDC, the internal descriptor properties are updated by the ONAP user.
License model files can be added by the user in SDC.
The operator may add additional artifacts to the resource (optional). The resource becomes available in the SDC catalog for use in service creation.

Design Service

The Service Designer composes resource descriptors into a Service descriptor.
The Service Designer attaches service-specific flows, such as FM, Configuration, Accounting, PM, security.

SDC Internal Package for ASD

The following depicts SDC internal package for ASD.

SDC adds an UUID identifier
SDC adds additional TOSCA Metadata
SDC transforms ASD into internal models
SDC can add a license model file
The user may optionally add additional artifacts manually

Mapping between ASD and SDC internal model

ASD specification is relatively simple
Propose to use ASD specification as the SDC internal model

Application Service Descriptor					SDC AID DM (Internal Data Model) - VNF/CNF
Attribute	Qualifier	Cardinality	Content	Description	Attribute	Qualifier	Cardinality	Content	Description
asdId	M	1	Identifier
asdSchemaVersion	M	1	Version
asdProvider	M	1	String
asdApplicationName	M	1	String
asdApplicationVersion	M	1	Version
asdApplicationInfoName	M / O	0..1	String
asdInfoDescription	M / O	0..1	String
asdExtCpd	M / O	0..1	dataType.ExtCpd
enhancedClusterCapabilities	M / O	0..1	dataType.enhancedClusterCapabilities
deploymentItems	M	1..N	DeploymentItem

Application Service Descriptor > DeploymentItems					SDC AID DM (Internal Data Model) - VF Module
Attribute	Qualifier	Cardinality	Content	Description	Attribute	Qualifier	Cardinality	Content	Description
deploymentItemId	M	1	Identifier
artifactId	M	1	Identifier (reference to)
artifactType	M	1	String/enum
deploymentOrder	M	1	String
lifecycleParameters	M	1	String

Enhancement of SDC Internal ASD model

- SDC allows SDC designers to customize/add custom properties when it creates internal ASD models
  - SDC UI allows the user to define necessary input parameters and add custom resource properties...
  - in that case, enhanced ASD can contain most of resource information for the orchestration by SO/Helm v3
- SDC stores the original vendor ASD packages

Package Distribution

The following depicts SDC Service CSAR distribution and storage.

- SDC sends package notifications to DMaaP for its subscribers (Catalog Manager, SO, other ONAP runtime components)
- Catalog Manager queries ASD descriptors once it gets a package notification from SDC via DMaaP
  - note: the current ONAP runtime Catalog Manager handles ETSI packages. we may extend it to handle ASD. TBD
- SDC pushes Helm Charts to the target Helm Repository
- SDC pushes Images to the target Image Repository
  - Note: SDC will support large-size images
- Catalog Manager, Helm Repository and Image Repository are centralized in the PoC. Domain-specific repositories will be considered in the future.

LCM Orchestration

The following diagram depicts ASD orchestration for LCM.

A deployment order is received, along with the required parameter values
The cloud-native deployment tool is invoked with the received parameters to transform the cloud artifacts into K8S resource descriptions
The K8S resource descriptions, ASD and any other relevant data is sent to the placement function
Placement decision is done based on input data
Inform deployment of placement
Request the cloud native deployment tool to deploy on the identified target cluster
Cloud native deployment tool deploys application in the chosen cluster using the K8S API

Component Functional Enhancements

SDC

CDS

SDNC

SO

SO Helm Adapter (extend the SO K8S Adapter??)

Catalog Manager (extend the ETSI Catalog Manager??)

Helm Process (a.k.a. Helm v3)

Helm Repository

Image Repository

OOF

AAI

Policy

Interfaces

SDC Onboarding

- - SDCE-1

SDC and Catalog Manager

- - TBD
  - should we leverage the Model_catalog component which was designed for ETSI package???

SDC and Helm Repository

- - TBD

SDC and Image Repository

- - TBD

OSS/BSS (or SO Client) and SO

- - SO NBI

SO and Helm Processor

- - TBD

Helm Processor and Placement

- - TBD

Helm Processor and Helm Client

- - TBD

Helm Client and O-Cloud (K8S)

- - Kubernetes APIs

Components (Functions and Requirements)