In the message dated: Sun, 16 Mar 2014 13:31:42 -0500,
The pithy ruminations from Chase Hoffman on
<Re: [lopsa-discuss] Site Monitoring Conundrum> were:
=> Ah, if only the application could be load balanced. I wish. Nope, because
=> of the way the data is cached on the app server, it's not currently load
=> balanceable.
=>
=> My concern with Nagios is that I don't want it to rerun - I want to figure
=> out how to have it NOT hit all sites simultaneously (but in staggered
=> sequence) during a certain window, and then monitor all sites the rest of
=> the time.
This sounds like you need some kind of a web-accessible 'flag', to indicate to
Nagios whether the app is priming or not. In this case, you wouldn't use the
native web tests w/in Nagios, but you'd call a local app to check each site.
For example:
On the web server, when priming begins, have
http://web.server/status.html
return the string "priming". When priming is
complete, return the string "operational".
This could be extended to give a status of each site by name (whether it is
priming or not), and use that to drive whether Nagios checks the site or not.
=>
=>
=> On Sun, Mar 16, 2014 at 11:07 AM, Murphy-Olson, Daniel E. <
=> [email protected]> wrote:
=>
=> > >
=> > > Ideally I guess I'm looking for some sort of system wherein I can a)
=> > pull URIs from a database, b) monitor up/downtime, and c) introduce some
=> > sort of priming logic after maintenance.
=> > >
=> > > Is there a commercial product out there that would do this, or are we
=> > going to have to roll our own?
Write your own shell script to do the web status checks, called as a
Nagios plugin*, returning Nagios-compatible status results (and more
human-readable results, depending on the command line flags). For example:
##########################################################
#! /bad/pseudo-code
statusURL=http://web.server/status.html
URLlist=/file/with/list/of/URLS/to/test # in the form:
# http://url.to.check expected string
returntype=nagios
if [ "X$1" = "X-h" ] ; then
# return human-readable results
returntype=human
fi
status=`curl $statusURL`
case $status in
priming)
returnval=0
returntxt="WARNING: priming web data"
if [ $returntype = "human" ] ; then
returntxt="$statusURL contains the text 'priming'"
fi
echo $returntxt
exit $returnval
;;
operational)
while read line
do
URL=`echo $line | cut -d" " -f1`
teststring=`echo $line | cut -d" " -f2-`
status=`curl $URL`
echo $status | grep -qw "$teststring"
if [ $? = 0 ] ; then
# OK
returntxt="${returntxt}<BR>OK: $URL"
else
returntxt="${returntxt}<BR>CRITICAL: $URL"
returnval=2
fi
done < $URLlist
if [ $returnval = 0 ] ; then
echo "OK: all web sites<BR>$returntxt"
else
echo "CRITICAL: $returntxt"
fi
exit $returnval
;;
*)
returnval=2
returntxt="CRITICAL: could not determine webserver status from
$statusURL"
echo $returntxt
exit $returnval
;;
esac
##########################################################
* Please follow the Nagios plugin specs:
https://nagios-plugins.org/doc/guidelines.html
Thanks,
Mark
--
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