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This guide is geared to provide information regarding  how to do service design to automate instantiation and day0 configuration.

Installation

ONAP is meant to be deployed within a Kubernetes environment. Hence, the de-facto way to deploy CDS is through Kubernetes.

ONAP also package Kubernetes manifest as Chart, using Helm.

Prerequisite

https://docs.onap.org/en/latest/guides/onap-developer/settingup/index.html

Setup local Helm

helm serve &
helm repo add local http://127.0.0.1:8879

Get the chart

Make sure to checkout the release to use, by replacing $release-tag in bellow command

git clone https://gerrit.onap.org/r/oom
git checkout tags/$release-tag
cd oom/kubernetes
make cds

Install CDS

helm install --name cds cds

Design time

Bellow are the requirements to enable automation for a service within ONAP.

Currently, ONAP officially supports instantiation and post-instantiation use cases.

Instantiation use case

The goal is to be able to automatically resolve all the HEAT environment variables, called cloud parameters.

Prerequisite


Required workflows

The following workflows are contracts established between SO, SDNC and CDS to cover the instantiation and the post-instantiation use cases.

resource-assignment

This action is meant to assign resources needed to instantiate the service. The goal is to resolved all the HEAT environment variables.

This action is triggered by Generic-Resource-API (GR-API) within SDNC as part of the AssignBB orchestrated by SO. Hence it will be triggered for each VNF(s) and VF-Module(s).

In order to know for which entity the action is triggered, one input is required, that is the artifact prefix (see bellow for explanation).

artifacts

For each VNF and VF-Module comprising the service, a combinaison of a template and mapping is needed.

The requirement is as follow for VNF:

${vnf-name}-template
${vnf-name}-mapping

and as follow for VF-Module, where the vf-module-label is actually the name of the HEAT template file.

${vf-module-label}-template
${vf-module-label}-mapping

${vnf-name} and ${vf-module-label} is what we call the artifact prefix.

template

The template has to be a resource accumulator template; that be composed of the following sections:

  • resource-accumulator-resolved-data: defines all the resources that can be resolved directly from the context. It expresses a direct mapping between the name of the resource and its value.

    RA resolved data 
      "resource-accumulator-resolved-data": [
    {
      "param-name": "service-instance-id",
      "param-value": "${service-instance-id}"
    },
    {
      "param-name": "vnf_id",
      "param-value": "${vnf-id}"
    }
  ]

  • capability-data: defines what capability to use to create a specific resource, along with the ingredients required to invoke the capability and the output mapping.

    RA capability payload 
        {
      "capability-name": "netbox-ip-assign",
      "key-mapping": [
        {
          "payload": [
            {
              "param-name": "service-instance-id",
              "param-value": "${service-instance-id}"
            },
            {
              "param-name": "prefix-id",
              "param-value": "${private-prefix-id}"
            },
            {
              "param-name": "vf-module-id",
              "param-value": "${vf-module-id}"
            },
            {
              "param-name": "external_key",
              "param-value": "${vf-module-id}-vpg_private_ip_1"
            }
          ],
          "output-key-mapping": [
            {
              "resource-name": "vpg_private_ip_1",
              "resource-value": "${vpg_private_ip_1}"
            }
          ]
        }
      ]
    }
scripts

If any of the mapping uses a source capabbility to resolve a parameters.

config-assign

This action is meant to assign all the resources and mesh the templates needed for the configuration to apply post-instantiation.

This action is triggered by SO during after the AssignBB has been executed for Service, VNF and VF-Module.

artifacts

Combinaison of templates with respective mappings

Scripts if needed

config-deploy

This action is meant to push the configuration templates defined during the config-assign step for the post-instantiation.

This action is triggered by SO during after the CreateBB has been executed for all the VF-Modules.

artifacts

Combinaison of templates with respective mappings

Scripts using Netconf or Restconf to push configure the network element.


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