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The prize for week 4 in our 2010/2011 post-of-the-week contest (week ending Aug 7th) goes to SCOM 2007 guru Raphael Burri. Raphael provided an XML in answer to the challenge of dynamic web monitoring – discovering the URL (and changes in the URL).
The Problem
For Robert G., dynamic web monitoring on Operations Manager 2007 SP1 was necessary to automatically to avoid a very real business problem. Says Robert:
I am trying to make our web monitoring as dynamic as possible. The monitoring that we need to do is only till the first page is loaded in other words only request 1. The way I see it there is 2 basic thinks needed for web monitoring. The watcher node and the URL.
Watcher node: I have a discovery that uses registry keys to discover watcher nodes.
URL: We have the IIS MP that discovers all websites. What I do is I target the IIS Websites class looking for specific websites and populate a class with the URL info. The reason I want to discover the URL's is that if the sever name changes the URL changes and if the URL is hard coded in the Web Application (URL Probe) then you have to re-record the Web Application or in the least change the URL in the URL Probe. In doing this you have to take the MP through a full development cycle and have everything tested again. This takes time so the URL will not be monitored for a time. Bad for Business.
The Solution
Says Raphael: Assuming you only need to call that discovery script once a day or so: You may also use the pre-R2 way of using PoSh from within an MP by calling powershell.exe from aCommandExecuterDiscoveryDataSource running somewhere where you've got the Operations Manager Shell installed and proxying is enabled (RMS for example). Pseudo code snippet is attached.
A word of warning: That way of calling PoSh is rather heavy on the HealthService as it needs to load the entire PoSh environment on every call. So don't use it unless absoultely required and set a reasonably high frequency.
Read and Download
To read the original discussion and download the code, register on the site (free), login and visit the original thread at http://www.systemcentercentral.com/Forums/tabid/60/indexid/75912/Default.aspx?tag=Forums%20MP_Development
Well done Raphael! You're name goes into the hat for the next Post-of-the-Week prize drawing at TechEd Europe in Berlin.
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