Onelab An Introduction to Virtualization on PlanetLab. Baris Metin
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1 Onelab An Introduction to Virtualization on PlanetLab Baris Metin
2 Overview Onelab: Quick Introduction. What are we up to? Virtualization on PlanetLab : Requirements and Solutions
3 Onelab Vision Run a core test bed (PlanetLab Europe) Support additional technologies: emulation, wireless,... Also work on: federation, monitoring, virtualization, operations & management
4 Onelab Cooperations Europe: About 25 total partners USA (Princeton University): Codevelopment, Federation, Operations Japan (University of Tokyo): PLJ - PLE (- PLC) federation Australia (NICTA): MyPLC & OMF federation
5 Onelab Status nodes on 64 sites (+2 pending) with PLC federation 984 nodes overall on 488 sites
6 Working on... SFA (Slice-Based Facility Architecture) started federating with PLC using SFA testing with others: PLJ, EMANICS sfatables sfa user interface federating with OMF
7 Virtualization on PlanetLab Support distributed-virtualization where each service runs in a slice of global resources. using Linux-VServer on Nodes (Operating System-Level Virtualization) we also use QEMU to test nighty builds
8 Virtualization on PlanetLab Slices are spread over a (selected) group of nodes. Nodes run many virtual servers (slivers). There is no limit on the number of slivers on a node. We provide users information on nodes status (load average, # of slivers, computed reliability)
9 Why? PlanetLab has to support both: short-term experiments long-running services Must scale to support many users with minimal resources. These implied multiple services be able to run concurrently, since batch-scheduled facility is not conductive to 24x7 workload, and these services should be isolated from each other, so that one service does not unduly interfere with another.
10 How? NodeManager VServers: using utilvserver and util-vserver-pl Node tags and nodegroups define how vservers are created (bandwidth limits, different deployments, etc.) Brokerage Service: Sirius. It performs admission control on a resource pool. Port reservation system.
11 How? Fair share CPU scheduler (based on small modifications to the VServers code) VNET+: tag packets & isolate between slices Vsys: provide slices a way to execute privileged commands
12 Disadvantages Linux only Can not run multiple kernels Depend on linux-vserver kernel patches: relatively lightweight, still nontrivial software-engineering task. Additional patches to isolate slices
13 Still Provides high efficiency and isolation * Container-based Operating System Virtualization: A Scalable, High-performance Alternative to Hypervisors (Stephen Soltesz, Herbert Potzl, Marc E. Fiuczynski, Andy Bavier, and Larry Peterson)
14 Status 721 running slices Used by 1218 researchers Most slices spread (nearly) over all nodes. Daily: ~30 billion packets and ~15 TB traffic
15 Plans Currently running on Linux Testing We have plans to move to (to base ourself on Fedora 12)
16 Future? In theory, it is possible to make other virtualization systems work together with our approach. Possibly using in NodeManager. libvirt supports: Xen, QEMU, KVM, LXC, OpenVZ, UML, VirtualBox, VMware ESX and GSX, initial work to support linux-vservers is already done.
17 Links
18 Thank you! Questions?
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