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Enhancements in PlanetLab V3: Resource Management and New Slice Services

This presentation by Steve Muir from Princeton University discusses the upgrades in PlanetLab V3, focusing on improving resource management and supporting new slice services. Key changes include transitioning node software to a Fedora base, enhancing hardware support, and implementing a more efficient control framework for resources. The talk also covers database access improvements, the introduction of helper services, and the concept of "PlanetLab-in-a-box" for creating independent or federated PlanetLab instances. The overall goal is to make maintenance easier and foster community involvement in infrastructure development.

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Enhancements in PlanetLab V3: Resource Management and New Slice Services

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Presentation Transcript

  1. PlanetLab V3 and beyond Steve Muir Princeton University September 17, 2004

  2. Overview • Why upgrade? • What will change? • Resource management in V3 • PLC database access • Enabling helper services • PlanetLab-in-a-box

  3. Why Upgrade? • To make future maintenance easier • To improve resource management • To support new slice services • To enable multiple PlanetLab instances

  4. What Will Change? • Node software will be based on Fedora • 2.6.x kernel • broader hardware device support • up-to-date versions of packages • Slice-visible changes should be minimal • some packages added to base vserver

  5. Resource Management in V3 • plkmod replaced by CKRM + VNET • Class-based Kernel Resource Management • started at IBM, now at ckrm.sf.net • framework + resource controllers • memory, disk I/O bandwidth, CPU share • Virtualised Network Interface • no more safe raw sockets • controls outgoing network bandwidth (a la plkmod) • Disk quotas supported by vserver subsystem

  6. CKRM Resource Controllers • Class-aware enhancements to existing schedulers • Physical resources (CPU, RAM, I/O) • Virtual resources (number of tasks) • Get Involved: need to build more/alternate resource controllers to further improve system • Get Involved: build work load management system that use these resource management knobs to improve overall system efficiency

  7. PLC database access • The heart of PlanetLab • Slice API currently in use • Admin API for access to user, node, site information • Future: authentication against PLC db • step towards federated PlanetLabs

  8. Enabling helper services • Move slice support services into slices • more flexibility for users • less dependency on small core team • Slices need to associate with helpers • Helper services need access to privileged operations • provided by Proper

  9. Privileged Operations Service • Poking holes in the sandbox • in a safe, controlled manner • To be integrated with Node Manager • Operations supported • mount other slice filesystems • get/set file flags • execute processes in other slices • open real raw sockets

  10. Example 1: Seurat (CMU) • Monitoring of slice filesystems for intrusions • Read-only access to slice filesystems • voluntarily provided by slices • Monitors each slice for file changes • Uses spatial and temporal correlation to detect anomalous changes

  11. Example 2: Stork (U. of Arizona) • Manages packages installed in multiple client slices • arranges efficient sharing of files • Initialises slices with files required by user • Provides upgrades when new package available

  12. Future: PlanetLab-in-a-box • How to create multiple PlanetLabs • Both federated and independent • Federated share PLC database • or pieces of it e.g., user authentication • Independent has its own database • corporate internal PlanetLab • personal testing and development

  13. Example 3: Authentication Service • ssh in a slice • Proper provides sudo-like access from authentication slice to client slices • Easily extended to other authentication mechanisms • GSSAPI - Grid Security System • Rex (NYU) - Secure File System

  14. Example 4: SHARP (Intel/UCSD) • Resource broker for slices • Node Manager allows SHARP to trade resources between slices • trade one resource for another • or concentrate resources in one period • Decentralised from PLC

  15. Conclusions • PlanetLab V3 will be easier to maintain • In-sync with standard Fedora Linux • And have better resource management • Decentralised development is the goal • more users contributing infrastructure code • Lots of ways to get involved!

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