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Screen Snapshot Service

Screen Snapshot Service. Kurt Biery SiTracker Monitoring Meeting, 23-Jan-2007. SSS Introduction. The goal is to provide a “snapshot” of a graphical interface to remote users. What is a snapshot? An image copy of a graphical interface at a particular instance in time.

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Screen Snapshot Service

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  1. Screen Snapshot Service Kurt Biery SiTracker Monitoring Meeting, 23-Jan-2007

  2. SSS Introduction • The goal is to provide a “snapshot” of a graphical interface to remote users. • What is a snapshot? • An image copy of a graphical interface at a particular instance in time. • Examples: DAQ system buffer display, operator control program, … • A view-only image, so there is no danger of accidental user input. • Initially implemented for desktops but could be targeted to individual application GUIs. K. Biery – CMS Monitoring, 23-Jan-2007

  3. SSS Components Producer Web Browser • The snapshot service is composed of three types of components: • producers that periodically capture snapshots of specified computer desktops and send the snapshots to a server • a server that receives the snapshots from the producers, converts them to image files in an easily accessible format, and serves them to clients • consumers that periodically fetch updated images from the server and display them to users • In the initial version of the system, these pieces have the following implementations: • the producer is a Java application that runs on the host that has the display(s) of interest • the server is a web application that runs inside the Tomcat Java application server • the client is a combination of JSP pages and Javascript that execute within a web browser requests Producer snapshots Server Web Browser Producer image files K. Biery – CMS Monitoring, 23-Jan-2007

  4. SSS Demonstration Sample Monitor • I have some sample producers running: • A desktop PC in my office with a demonstration monitor GUI • A four-display node in the CMS remote operations center (cmsroc9) • The CMS ROC folks have allowed me to use one of their web servers for demonstrating SSS (nippon.fnal.gov) • We can use the following URL in a web browser to see the list of available snapshots: • http://nippon.fnal.gov:8080/snapshot/ShowImageList.jsp • There is also a sample server admin page for keeping the CPU usage of the server in a reasonable range: • http://nippon.fnal.gov:8080/snapshot/ServerDiag.jsp requests Laptop Browser CMS ROC Web Server snapshots CMS ROC Host image files K. Biery – CMS Monitoring, 23-Jan-2007

  5. SSS Work in Progress • Better handling of multiple displays • User controls for the producer application • Dynamically change the snapshot frequency • Pause/resume snapshots • Specify number of displays and how they should be handled • Better deployment of the producer application • Refinements to how CPU usage is controlled • Security controls, if needed K. Biery – CMS Monitoring, 23-Jan-2007

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