[Xymon] Avoid email storm

Japheth Cleaver cleaver at terabithia.org
Wed Jun 7 23:29:47 CEST 2017

On 6/7/2017 1:29 PM, Asif Iqbal wrote:
> On Wed, Jun 7, 2017 at 4:26 PM, Ryan Novosielski <novosirj at rutgers.edu 
> <mailto:novosirj at rutgers.edu>> wrote:
>     I stop the MTA sometimes when I know this is about to happen.
> In our case, we do not see a pattern when the firewall is crashing.
>     ________________________________________
>     From: Xymon <xymon-bounces at xymon.com
>     <mailto:xymon-bounces at xymon.com>> on behalf of Asif Iqbal
>     <vadud3 at gmail.com <mailto:vadud3 at gmail.com>>
>     Sent: Wednesday, June 7, 2017 4:14:43 PM
>     To: xymon at xymon.com <mailto:xymon at xymon.com>
>     Subject: [Xymon] Avoid email storm
>     xymon is behind a firewall and lately firewall is dying a lot and
>     at restore we are getting email storm about devices that are on
>     other sites.
>     firewall team will have a replacement "soon".
>     In the meantime I guess I should add a depend (first hop) for all
>     2000+ devices in hosts.cfg file.
>     Is there another option with less editing?
>     Thanks for any suggestion!

Flap detection and delaying the alert might help, but delayred= 
(hosts.cfg(5)) might be a better option for handling this, depending on 
the number of network tests you have.

If the entire server is behind the FW or you have some other 
programmatic way of determining what will be on the other side of this 
FW, I'd suggest adding (either via route or depends) data in regardless 
(you might be able to get creative with sed or perl to make this 
addition easier). I've found the more flexibility you can give yourself 
in describing what you're testing, the more options you'll have for 
coping with situations like this.


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