[Xymon] Elegant way to run an aggregate ext test over multiple clients?

[Jason Kincl]

Another option could be to send your Q message as a "data" message instead of a "status" message, then set up a xymon_channel on the server that listens for data messages and when you see your Q data message come along, to do the calculations and report a single status back to xymon. The webpage scraping is probably easier though, but I just thought of it and wanted to bounce the idea. 

On May 17, 2011, at 8:56 PM, Vernon Everett wrote:

> That's probably how I would do it.
> I have done something similar to this before, but I no longer have
> access to the code.
> 
> You need to get all the values together in one script, and grabbing
> the web page is a pretty quick and easy way to do so.
> A command you may find useful, is this
> sed -e :a -e 's/<[^>]*>//g;/</N;//ba'
> It will strip most HTML tags, making parsing a lot easier.
> However, if Q is being graphed, it will already be on a line by
> itself, so you may be able to simply
> grep "^Q=[1-9][0-9]*$"
> or
> grep "^Q:[1-9][0-9]*$"
> Depending on how your scripts send the data.
> 
> Hope it works..
>    Vernon
> 
> 
> 
> 
> On Wed, May 18, 2011 at 9:32 AM, Elizabeth Schwartz
> <betsy.schwartz at gmail.com> wrote:
>> Suppose I have a five-server cluster, and on each server there's a
>> calculated value, call it Q, and an ext test "qlength" that operates
>> on Q and returns a color and a message containing Q.
>> 
>> We want to make a server-side test that does some alerting based on
>> aggregate values of Q across all five servers in the cluster. Not a
>> combo test, we want to do math, like Sum (Q1...Qn) >Threshold.
>> 
>> 
>> *One* way to get Q for each server is to write a server-side ext test
>> that loops a wget over each host, something like:
>> 
>>       wget  /dev/null
>> http://xymon/xymon-cgi/svcstatus.sh\?HOST=myhost.example.com\&SERVICE=qlength
>> 
>> then parse each server's Q info out of the html and do my arithmetic,
>> but is there a more direct way?
>> 
>> thanks for any pointers clues or code snippets
>> Betsy
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>> Xymon at xymon.com
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>> 
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--------------------
Jason