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/nullhttp://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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Jason