Changes between Initial Version and Version 1 of Larvnet


Ignore:
Timestamp:
02/23/12 11:19:01 (12 years ago)
Author:
jdreed
Comment:

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  • Larvnet

    v1 v1  
     1Larvnet is the cluster monitoring system which gathers the data 
     2returned by the "cview" command--a list of free machines of each type 
     3in the Athena clusters, and a list of the number of current jobs 
     4pending on Athena printers. 
     5 
     6When a user logs in or out of an Athena machine, or when an Athena 
     7machine starts up the login system, the machine sends a status packet 
     8to the Larvnet server.  The status packet gives the machine's name, 
     9host type, and an determination of whether any user is logged into the 
     10machine at the console.  Workstations can also be queried for the same 
     11status information using the "busyd" UDP service, which runs out of 
     12inetd.  The Larvnet server separates machine names into clusters 
     13according to a configuration file and produces a data file once per 
     14minute containing counts of the free machines in each cluster of each 
     15type. 
     16 
     17The Larvnet server also queries the print spooler for each Athena 
     18printer once per minute, using an "lpq" query.  (Sadly, the output 
     19returned by "lpq" is not standardized well enough to be robustly 
     20machine-readable, so the mechanism here sometimes requires maintenance 
     21when changes are made to the printing system.)