Enhance multi tenant policy in VNF LCM
An enhancement of the multi-tenant policy in the VNF lifecycle management. * Discussion to enable a non-admin role user to instantiate VNF. * Add design for negative functional test cases for VNF LCM operations and validate notification is received by the tenant specified in the subscription sequence. Implements: bp enhance-multi-tenant-policy Change-Id: Idf398ea9bf083afdecb99a0cea3c539a34ec17d3
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Manpreet Kaur
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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=======================================================
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Enhance Multi-tenant policy in VNF Lifecycle Management
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=======================================================
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https://blueprints.launchpad.net/tacker/+spec/enhance-multi-tenant-policy
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This specification discusses the enhancement of multi-tenant policy in the
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VNF lifecycle management.
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Discussion to enable a non-admin role user to instantiate VNF, tenancy
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isolation between admin and the non-admin role users.
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Problem description
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===================
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In tacker, a non-admin role user is able to get resource information
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for VNF, but fails to perform certain VNF LCM operations such as VNF
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instantiation.
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Second, need to implement negative functional test cases for VNF LCM
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operations and validate notification is received by the tenant specified
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in the subscription sequence.
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Proposed change
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===============
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1. Allow non admin role user to instantiate VNF
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-----------------------------------------------
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In OpenStack Heat Orchestration Template (HOT) enables the creation of most
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OpenStack resource types, such as instances, floating IP addresses, volumes,
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security groups and users, collectively known as the stack creation process.
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.. note:: By default admin role user is allowed to create an OpenStack stack.
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To allow non-admin role users to create VNFs, the OpenStack resource policies
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must be changed.
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Below mention policies require necessitates change:
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#. Heat Policies
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* resource_types:OS::Nova::Flavor
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* resource_types:OS::Cinder::VolumeType
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* resource_types:OS::Neutron::QoSPolicy
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* resource_types:OS::Neutron::QoSBandwidthLimitRule
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#. Nova Policies
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* os_compute_api:os-flavor-manage
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* os_compute_api:os-flavor-manage:create
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* os_compute_api:os-flavor-manage:delete
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#. Neutron Policies
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* create_policy
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* create_policy_bandwidth_limit_rule
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.. note:: As per the investigation, OpenStack allows admin role users to create
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stack, creation process involves different OpenStack services (such as Heat,
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Nova, Glance, etc.).
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To enable a non-admin role user requires the above mention policy changes
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as well as code level changes in desired OpenStack services as well.
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Adjourning investigation for this cycle, in future we can resume.
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2. Design for negative functional test cases
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--------------------------------------------
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The functional test case architecture for a multi-tenant environment,
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as described in spec [#ADD-MTPOLICY]_, dedicates a subscription notification
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server for each tenant. Validates that these servers only receive alerts
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of VNF package or LCM operations conducted by their respective tenants.
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To address the design requirement, multiple instances of a fake HTTP server
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was created, one for each tenant, to function as notification servers.
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In Zuul, the fake HTTP server class instances run on the same test node
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(controller-tacker).
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In single tenancy, the desired HTTP requests and responses are fabricated(mock)
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in functional test cases.
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Similarly in a multi-tenant environment, mock HTTP requests and responses for
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notification servers, with additional validation of tenant details present in
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notification.
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Alternatives
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------------
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An alternate approach to designing a negative functional test case in Zuul,
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where two distinct nodes are needed to construct notification servers.
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This approach has the following design/implementation challenges:
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* Adding two new Zuul nodes with a specific port open (opening a port in Zuul
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may necessitate a special request).
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* On the new nodes, use ansible-playbook or similar to set up an HTTP server.
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* A network issue may cause the actual HTTP request to timeout.
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Data model impact
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-----------------
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None
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REST API impact
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---------------
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None
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Security impact
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---------------
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None
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Notifications impact
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--------------------
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None
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Other end user impact
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---------------------
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None
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Performance Impact
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------------------
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None
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Other deployer impact
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---------------------
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None
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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Manpreet Kaur <kaurmanpreet2620@gmail.com>
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Work Items
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----------
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* Identify and enable the OpenStack policies that allow non admin role
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users to create VNF.
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* Add negative functional test cases for VNF LCM operations and validate
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notification is received by the tenant specified in the subscription
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sequence.
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Dependencies
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============
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None
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Testing
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=======
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Functional tests will be added to cover cases required in the spec.
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Documentation Impact
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====================
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None
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References
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==========
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.. [#ADD-MTPOLICY] https://specs.openstack.org/openstack/tacker-specs/specs/yoga/multi-tenant-policy.html
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