[openstack-dev] [tacker] Tacker design sessions summary
sseetha at Brocade.com
Fri Nov 11 09:55:13 UTC 2016
Here is a high level summary (delayed!) of the Tacker design sessions  at the summit. Please feel free to add/comment on the notes in case I have missed any.
Topic-1: VMware / vCloud, Public Cloud
There is a need for supporting VIMs beyond OpenStack in Tacker. It was suggested that native VMware deployment using vcloud is typical in customer deployments. There was also discussion on VMware integrated OpenStack as a deployment choice. Both options were explored and the general agreement was to use the vCloud api to talk to VMware VIM. The open vCloud API is able to support complex resource requests from Tacker with a rich set of REST APIs. Action items include revisiting the current VIM API that will allow any VIM to be registered in Tacker and reference OpenStack driver be part of VIM module, drivers including VMware will reside outside Tacker project. CI options - 3rd party CI testing similar to Nova VMware driver tests needs to be integrated in Tacker. Tacker feature compatibility such as - scaling, monitoring, mgmt driver, auto network, auto flavor creation need to be evaluated and implemented specific to vCloud API.
Topic 2: Containerized VNFs
The topic was around exploring the current options for launching VNFs as containers. Zun project provides API for containers life cycle management. There are still questions around how to consume zun's REST APIs and its
interaction with container networking project such as Kuryr. Also, the role of VIM in container management such as OpenStack using Zun, VMware vCloud using photon was discussed to identify the support required by VIM for container management. It was agreed that a spec needs to be created to come with a plan for 1st iteration of container support in Tacker.
Topic 1: NSD - Mistral Integration
The role of workflow composer such as mistral was discussed to implement the NSD feature. Given, NSD template describes a complex network service, there are benefits in bringing mistral to process the template with dependency requirements or to initiate resource requests in parallel. Also, any error scenarios or forking sub tasks on certain matching VNF criteria can be handled with mistral support, especially for forwarding graphs. The action items identified was to build a basic translator that can map simple NSD TOSCA templates to Mistral workflow files in the 1st iteration for Ocata cycle. This can later be evolved to handle more complex requirements of NSD.
Topic 2: EM Interface Evolution
The discussion was around defining the API interactions between Tacker and external EM interface for VNF management. It was agreed that there is no standard way to define and implement this feature. The orchestrator and framework should implement a basic version of this interaction and later evolve it as more requirements are gathered. There needs to be a feedback loop from EM interface to Tacker to drive the policies and performance SLAs of VNFs. The orchestrator needs to provide the calls to EM interface for VNF configuration management. Also, VNF change notifications should be monitored by the EM interface and the data sent as a loopback to Tacker to trigger action requests.
Topic 3: Senlin Integration:
Senlin team provided a good overview of the project and described cluster management for scaling and HA policies in Tacker. Heat-translator provides supports for senlin resources. Also, senlin integration generates multiple templates including profiles and clusters that will have to be handled and managed within Tacker. There needs to be support for specifying target set of nodes/VDUs that needs to be scaled out/scaled in by senlin. There are challenges in translating tosca scaling policies and vnf properties to senlin resource types such as profile, cluster and policy as there is no 1:1 mapping of these resources between tosca template and senlin heat templates. It was agreed that an initial support can be brought in as an alternative to heat auto scaling if senlin is deployed on the system.
Cross project discussions
Topic: 4 tosca-parser/heat-translator:
The TP/HT folks updated the team on the 2 features that are brought in for Ocata cycle. 1. nested-templates which is required for target VDU scaling and 2.substitution mappings required for NSD implementation. The team discussed on supporting forwarding graph in NSD in tosca-parser project. The action item identified was to find the gaps between the NSD spec in tosca profile and tosca-parser support and TP team will correspondingly follow up with the required fixes.
Topic 5: networking-sfc:
Tacker is now using networking-sfc to implement forwarding graphs. The ask was to rely on a stable branch of networking-sfc to bring in the functional tests for forwarding graphs in Tacker. The networking-sfc team will create newton release in December and will follow the regular release schedule going forward from Ocata cycle. The usage guide for networking-sfc will be revisited to make it more intuitive for newcomers and users of networking-sfc. The mandatory network_source_port_id specification in networking-sfc for ODL backend driver will be taken up as a bug and followed up by networking-sfc team. Also, the source_port_id requirement for ovs reference driver need to be revisited, team agreed to sync up again on identifying an alternate solution.
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