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Manpreet Kaur 4819b827c8 Support feature to attach the existing volume

This patch attaches already created volume to vnf using volume id.
The existing volume id can be added to tosca.nodes.BlockStorage node,
in this case, no new volume will be created while vnf deployment.

Implementation:
* Set tosca.nodes.BlockStorage.Tacker "size" required as false,
  this override property definition mention in
  tosca.nodes.Storage.BlockStorage present in tosca parser.
  Please refer [1] for tosca.nodes.Storage.BlockStorage details.
* Add a local dictionary to store volume id present in
  tosca.nodes.BlockStorage.Tacker. This dictionary is use in
  to determine cinder volume mapping.

Additionally update block_storage_usage_guide.rst with changes
required to attach existing volume.

Added cinderclient in test_requirement for functional test case.
Add release notes for feature.

[1]: http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csprd01/TOSCA-Simple-Profile-YAML-v1.2-csprd01.html

Change-Id: If5d386a64f98603de843f96287c1e296ae6a2e1f
Implements: blueprint attach-existing-volume

2021-01-28 13:11:03 +05:30

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Orchestrating VNFs with attached Volumes

To support persistent volumes to VNF, the TOSCA NFV profile supports a new type of nodes. Tacker has now the feature of parsing of those new nodes and creation of cinder volumes which are attached to the VDUs.

Prerequisites

To have persistent volume support to VDUs, we must enable cinder service in addition to the other services needed by Tacker.

VNFD Changes

There are two steps to have volume attached to VDU:

Create volume or Use an existing volume.
Attach Volume to VDU

Create Volume

To add volume, we need to add the below node to the VNFD:

VB1:
  type: tosca.nodes.BlockStorage.Tacker
  properties:
    size: 1 GB

Use Existing Volume

We can also attach an already created/existing volume with VNF by providing volume_id in input.

topology_template:
  inputs:
    my_vol:
      description: volume id
      type: string

  VB1:
    type: tosca.nodes.BlockStorage.Tacker
    properties:
      volume_id: my_vol

Attach volume to VDU

Next attach the created volume to VDU as below:

CB1:
  type: tosca.nodes.BlockStorageAttachment
  properties:
    location: /dev/vdb
    requirements:
      - virtualBinding:
          node: VDU1
      - virtualAttachment:
          node: VB1

With these additions, the new VNFD looks like below:

tosca_definitions_version: tosca_simple_profile_for_nfv_1_0_0
description: Demo example

metadata:
  template_name: sample-tosca-vnfd

topology_template:
  node_templates:
    VDU1:
      type: tosca.nodes.nfv.VDU.Tacker
      capabilities:
        nfv_compute:
          properties:
            num_cpus: 1
            mem_size: 512 MB
            disk_size: 1 GB
      properties:
        image: cirros-0.4.0-x86_64-disk
        availability_zone: nova
        mgmt_driver: noop
        config: |
          param0: key1
          param1: key2

    CP1:
      type: tosca.nodes.nfv.CP.Tacker
      properties:
        management: true
        order: 0
        anti_spoofing_protection: false
      requirements:
        - virtualLink:
            node: VL1
        - virtualBinding:
            node: VDU1

    VB1:
      type: tosca.nodes.BlockStorage.Tacker
      properties:
        size: 1 GB

    CB1:
      type: tosca.nodes.BlockStorageAttachment
      properties:
        location: /dev/vdb
      requirements:
        - virtualBinding:
            node: VDU1
        - virtualAttachment:
            node: VB1

    VL1:
      type: tosca.nodes.nfv.VL
      properties:
        network_name: net_mgmt
        vendor: Tacker

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