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Deconstructing PLC

Deconstructing PLC. Larry Peterson. PlanetLab Developer’s Meeting May 13-14, 2008. Overview. PlanetLab NG = GENI Prototype PlanetLab 4.2 + geniwrapper (Soner Sevinc) PLC wrapper: prototype done, integration underway NM wrapper: prototype in progress Wrapper includes… interfaces

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Deconstructing PLC

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  1. Deconstructing PLC Larry Peterson PlanetLab Developer’s MeetingMay 13-14, 2008

  2. Overview • PlanetLabNG = GENI Prototype • PlanetLab 4.2 + geniwrapper (Soner Sevinc) • PLC wrapper: prototype done, integration underway • NM wrapper: prototype in progress • Wrapper includes… • interfaces • namespaces • security mechanisms • Migration plan • seed registries from PLC’s DB • Current and new interfaces coexist • unbundle PLC over time • experiment with peering

  3. Security Architecture • Authorities • responsible for (vouch for) the objects they manage • Global Identifier (GID) • actually a certificate • (UUID, HRN, PubKey, TTL)signed by chain of authorities • Human Readable Name (HRN) • e.g., planetlab.eu.inria.p2p • Credentials • slice: explicitly identifies permitted operations • component (aka ticket): explicitly identifies resources (aka rspec)

  4. CM AM CM CM SM SR Case 1 User Following focuses on slice creation and not node management; does not include CR (would be associated with each Aggregate). PLC x …

  5. CM AM CM CM SM SR Case 2 User Emulab PLC SM x …

  6. CM CM CM CM CM CM AM SM SR Case 3 User Emulab PLC SM AM … …

  7. SM CM CM CM AM CM CM AM CM SR Case 3a User VINI PLC x x … …

  8. SM AM CM CM CM CM CM CM AM SM SR Case 4 User PLE PLC SR x … …

  9. SM SM CM CM AM CM CM CM AM CM SR SR Case 4a User User PLE PLC x … …

  10. Peering Issues • NxN vs Hierarchy? • PLC, PLE, PLJ/PLA,… • VINI, GLabs,… • Emulab, DETER,… • At what level? • Registry + Slice Interface • Peering Interface • How rich is the policy? • slice count • sliver count • arbitrary resources

  11. Meeting Notes The following slides report “roadmap” discussions from the meeting

  12. Deconstructing PLC • Modify current DB/API to support wrapper (Reid) • Add “slice interface” to PLC wrapper (now have an aggregate) (Scott) • Port “slice interface: to NM wrapper (now have a component) (Scott) • Revisit PLC/NM sync in light of delegation • Specialize AM for VINI (understand topology) (Andy) • Integrate wrapper GUI into PLC GUI (Reid) • Implement a minimal SM = aggregate of aggregates (Aki) • Exports the slice interface, or something more? • Caches node info / remember where slice is embedded • Must be configurable -- what aggregates does it know (set policy) • How is this module named & accessed? • Filters the list it gives back according to caller • Can I present a full rspec to this call?

  13. Deconstructing (cont) • Longer-term issues • Federation outside the PL family • 3rd party SM (delegation is important) • Multiple-aggregate SMs relevant here • Worry about the “management interface” (currently private) • Get emergency shutdown right • What about killing slices on peer aggregate? • Overhaul security mechanisms • Make sure security modules leave audit trail

  14. Monitoring Software • Package for distribution • NM live-ness test • both PLC instantiated and delegated slice creation (Utah has code) • Export monitor info to tech contacts • Uber monitor page (comon+monitor+…) • Place for techs to communicate with us (and track it) • Make run-levels real (support tech intervention) • Give out root when in debug mode • Maintain “known security issues” page

  15. QA System • Support virtual and physical test nodes • Use Emulab (potentially available as a std Emulab option) • Package for distribution • OneLab uptake is an important milestone • Make output logs readily available to developers (notification)

  16. RSpec Discussion • Define an rspec that works today • Today’s attributes (only those that users can set) • Works with wrapper slice interface • Scope the rspec • Users can query/set themselves -- not in rspec • Admin can install themselves -- not in rspec • Requires privileged to establish (is allocate-able) -- is an rspec • Extend today’s attribute set to include some new resource(s) • Allocate whole (non-sharable) physical device to a slice for some time • GRE tunnel keys • Supercharged PL node (motivates private attribute namespace) • Specify parameters of hw fast-path: queues, buffers, bw, protocol… • Contexts (usage scenarios) • Configuring nodes (this is something different) • Advertising resources (includes same language, but not limited to it) • Descriptive, includes that which is allocate-able, but other info as well • Requesting / promising resources (definitely)

  17. RSpec / Data Modeling • Identify PL current attributes (Reid) • Prepare draft data model (Mary) • Get/install Eclipse EMF tool (watch the tutorial) • Extract code generator for Python (Scott) • Put up web page for comment (Reid) • Future • Embrace model in the PLC/DB • Revisit the over-the-wire representation (getSliver polling)

  18. Resource Allocation • Tickets are opaque • May be a table index • May be an rspec • May be a PLC DB entry (current implementation) • Tickets split/reassigned/redeemed by their source • Source is only one that can interpret the ticket • PlanetLab reality • PLC hands out tickets • Tickets redeemed/split at nodes • Necessary to implement Sirius • PLC and nodes are in cahoots • Alternative Interface • 2D table of resources/time (owner of the allocation & slice) • Calendar-like (trivially implement Sirius on top of this interface) • Ops: get/set_owner & get/set_slice • Owner decides what slice gets to use / slice then consumes • Set_slice like split (Split folds together slice & owner; split can’t revoke) • Also an escrow service that swaps rights (client of this interface) • Does this break PL’s “node state is soft” model? • Client gets receipt & has to refresh node state

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