On 2012-11-20 22:28, Zachary McGibbon wrote:
I'm working on some custom event handlers to do traceroutes to hosts
when the are down/unreachable (with custom Perl script) and save the
data into MYSQL database, however since the traceroute takes a few
seconds to run, I notice that Icinga isn't forking the event handler
into the background.
same goes for commands and notifications - the core needs to know
whether the executed command was successful or not. you should not use
eventhandlers taking a long period of time, as they may become blocking
when reaching their timeout all the time.
I tested this by applying my event handler to multiple hosts and then
setting them all to DOWN/HARD (my script looks for this to run the
traceroute) and then as I tail the log file I see it going through the
hosts one by one but waiting for the script to finish.
i'd rather put a token for another, cron-triggered script, and return
the eventhandler early in that case. like the pnp bulk mode with npcd
does - make the traceroute and db inserts asynchronous to the general
core check logic.
I tried to add a '&' at the end of my command to see if that could
background it but it didn't seem to work:
define command{
command_name traceroute-icmp
command_line $USER2$/tracedb.pl <http://tracedb.pl>
-4 -i -D $HOSTNAME$ -S $HOSTSTATE$ -T $HOSTSTATETYPE$ -I $HOSTADDRESS$ &
}
Any ideas?
if you really want to put your script into the background, fork a child
process and let it go (do not wait for it). though, to note - if this
isn't controlled, many eventhandler calls may create multiple children
waiting for resources, breaking your system (process monitoring et al).
so, instead of that method, see my asynchronous token proposal above.
Also, any way to increase the 30 second timeout that the event handler
has to run with? I can't seem to find a knob anywhere...
http://docs.icinga.org/latest/en/configmain.html#configmain-event_handler_timeout
- Zac
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