Version 1 (modified by Vic Thomas, 12 years ago) (diff)


Raven Quarterly Status Report for Q2 2010

Reporting period: Apr 1 - Jun 30 2010

PI: John H. Hartman (University of Arizona)

Major accomplishments

  • Publish/Subscribe system
  • Elimination of PyXML dependencies
  • Rewrite Keyconvert tool from C to Python
  • ServiceMonitor tool
  • Seattle support for Owl monitoring service
  • Continuing support for SFA credentials
  • Major Owl refactoring and enhancements
  • Enhanced Owl Mapviewer support
  • VINI support

Description of work performed during last quarter

Publish/Subscribe system

We created a publish/subscribe system that notifies slivers quickly and efficiently of events. The publish/subscribe system is used in Tempest to notify slivers of configuration changes that may require installing, updating, or removing packages.

Elimination of PyXML dependencies

We eliminated the use of PyXML by Raven, switching to an XML parser that is built into the Python distribution. This enhances Raven portability, opening up non-PlanetLab platforms where PyXML may not have been available.

Rewrite Keyconvert tool from C to Python

We developed our own ASN.1 parsing routines in native python and ported a C-based tool for converting SSH keys to Python. This eliminates dependencies on precompiled binaries, allowing Stork to run on more platforms and more diverse hardware.

ServiceMonitor tool

We created a tool for monitoring services that run in a sliver and automatically restarting them. This tool is typically used by long-running experiments where fault tolerance of failed processes over a long period of time must be guaranteed. The ServiceMonitor tool replaces several one-off special-purpose tools for monitoring different critical services.

Owl refactoring and enhancements

We refactored Owl not only to improve the code base but also to extend its capabilities. The Owl client now uses a library to communicate with the Owl server. This library can be used by services that want to use Owl directly without going through the client. The server now supports integer data, statistics such as the mean, column hiding, a legend containing field descriptions, increaing and decreasing sort on all columns, and a per-row view that displays only the data for a row (typically a sliver).

Seattle support for Owl

We ported the Owl client to the Seattle platform and performed a feasibility study of supporting other Raven tools on that platform. Owl allows Seattle experiments to report results back to a centralized database where they can be analyzed.

Continuing support for SFA credentials

We continued to update Raven tools to use new versions of SFA credentials. More work needs to be done as the Credential continues to evolve toward merged support of PlanetLab and ProtGENI.

Enhanced Owl Mapviewer support

Added new features to the Owl map viewer application, including a control panel for selecting display options and the ability to view links between nodes. Links allow services that implement virtualized network topologies, such as VINI, to be monitored by Owl.

Support for VINI

We added support for the Raven tools to automatically detect when they are installed on VINI nodes, and to install custom packages for the VINI platform. We created a monitoring application for Owl that allows latencies on VINI links to be monitored and reported to the Owl database. More work needs to be done with respect to VINI key distribution and initscript support to make it easier to provision VINI experiments with Raven.

Project participants

  • John H. Hartman (University of Arizona)
  • Scott Baker (SB Software)
  • Jude Nelson (University of Arizona)

Publications (individual and organizational)

  • None.

Outreach activities

  • None.


We worked closely with the following Cluster B members:

  • PlanetLab
  • GUSH
  • GpENI

We are also working with the ProtoGENI, Seattle, and VINI projects to port Raven to their platforms.

Other Contributions

  • None.