My solution, which I have implemented for quite a number of tests, is to do something similar to what xymon already does which is to use the xymon message client file.

For instance add a section to hobbitclient-sunos.sh, Solaris client used as an example:

echo [Qdata] cat my/q_file_results.txt # be careful what you do here if it is a script or something that can potentially hang the client look at the vmstat and iostat lines

From the server:

Using PERL as an example scripting language:

foreach my $host ( @hostList )
  {
  	@qData = `path2/bin/xymon localhost "clientlog $host

section=Qdata"`; }

Here is an example from the command line:

xymon at xymon1> ~/server/bin/xymon localhost "clientlog xymon1 section=who" [xymon at xymon1 all]$ ~/server/bin/xymon localhost "clientlog xymon1 section=who"

[who] xymon pts/0 May 18 22:48 (10.2.3.4)

Just make your own section on all the clients in the hobbitclient-[OS].sh script.

~David

-----Original Message----- From: xymon-bounces at xymon.com [mailto:xymon-bounces at xymon.com] On Behalf Of Jason Kincl Sent: Wednesday, May 18, 2011 12:46 To: Xymon Subject: Re: [Xymon] Elegant way to run an aggregate ext test over multipleclients?

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=ql ength

...

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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Jason

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