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Screen Snapshot Service

Screen Snapshot Service. Kurt Biery LAFS Meeting, 08-May-2007. SSS Introduction. What is the Screen Snapshot Service? A way to provide periodic, read-only copies of display images (snapshots) for remote viewing.

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Screen Snapshot Service

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  1. Screen Snapshot Service Kurt Biery LAFS Meeting, 08-May-2007

  2. SSS Introduction • What is the Screen Snapshot Service? • A way to provide periodic, read-only copies of display images (snapshots) for remote viewing. • It’s similar to products like VNC, pcAnywhere, and VGA2WEB but without the cost or danger of accidental remote control. • It can be used to make private-network displays viewable on the public internet (useful for remote monitoring). • It does not replace custom, full-featured remote monitoring tools developed by experiment and accelerator software groups. • It does not provide desktop sharing or document sharing. • It uses commonly available technologies for portability and ease of use. K. Biery – Screen Snapshot Service, 08-May-2007

  3. Remote Monitoring Scenario Private Network How to view my favorite monitor? Gateway Public Network My favorite monitor display. K. Biery – Screen Snapshot Service, 08-May-2007

  4. SSS Components Private Network • 3) Snapshot Consumer • Periodically fetches snapshots from server • Displays snapshots in a web browser • 1) Snapshot Server • Receives images from producers • Converts images to PNG • Serves images to consumers • Runs under Tomcat Public Network • 2) Snapshot Producer • Captures screen images periodically • Sends images to snapshot server • Implemented as Java application K. Biery – Screen Snapshot Service, 08-May-2007

  5. SSS Features • Producer • A Java application • Deployed and run with Java Web Start • Runs on Linux or Windows • Captures entire desktop currently using Java AWT tools • User controls include pause and resume buttons, the choice of production interval, and the specification of the display name • Server • Java Server Pages and other Java code running under Tomcat • Uses Java tools to convert RGB pixel values to PNG format • Consumer • HTML and JavaScript displayed in a browser • Checks for updates at a rate that is independent of the production interval (user selectable) • Allows user to switch between a full resolution image and one that fits in the browser window K. Biery – Screen Snapshot Service, 08-May-2007

  6. SSS Demonstration • Consumer #1 • This presentation computer • Producer #1 • Windows XP desktop in my office Public Network • Consumer #2 • Your laptop – try http://lhcsrv1.fnal.gov:8082/snapshot/ShowImageList.jsp • Producer #2 • Multi-display Linux host in LHC@FNAL ROC • Server • lhcsrv1.fnal.gov (LHC@FNAL web server) K. Biery – Screen Snapshot Service, 08-May-2007

  7. SSS Status • Currently being used by a couple of groups… • CDF – one week per month monitor owl shift in Italy – 10+ displays. • CMS – silicon tracker group at CERN. • LHC@FNAL – no regularly published displays as yet. • LHC – spoke with Pierre and Eugenia several weeks ago. • This is not yet a finished product… • Handling of multiple displays needs to be improved. • It would be very useful to save configurations of producers in a central location. • Application-specific displays (not full desktops) have been requested. • We should limit the hosts that can act as producers for a given server. • Additional documentation could help the installation process. • … K. Biery – Screen Snapshot Service, 08-May-2007

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