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Re: [monit] How to Achieve "if x restarts within y cycles then exec ..."

From: Art Age Software
Subject: Re: [monit] How to Achieve "if x restarts within y cycles then exec ..."
Date: Thu, 26 Jun 2008 18:10:09 -0700

On Thu, Jun 26, 2008 at 6:03 PM, Martin Pala <address@hidden> wrote:
> Art Age Software wrote:
>>> Yes, this could work. Optionally it could be possible to use the pidfile
>>> using similar approach:
>>> --8<--
>>> check process mysql with pidfile /var/run/mysqld/
>>>  mode manual
>>>  every 2 cycles
>>>  if failed unix "/var/lib/mysql/mysql.sock" then restart
>>>  if failed host localhost port 3306 protocol mysql then restart
>>>  if 5 restarts within 10 cycles then timeout
>>> check file mysql_pidfile with path /var/run/mysqld/
>>>  mode manual
>>>  if changed timestamp for 5 cycles then exec
>>> "/usr/lib/heartbeat/hb_standby"
>>> --8<--
>>> On restart the script will change the timestamp of the pidfile => the
>>> second
>>> service check can trigger failover/standby based on it.
>> I like your approach better because it seems more reliable. With my
>> approach, I think it is possible for the mysql protocol checks to
>> succeed if the timing is just right (i.e. the check happens between
>> restart and crash).
>> With your approach, should the condition match exactly for both
>> checks? For example:
>> if 5 restarts within 10 cycles then timeout
>> if changed timestamp 5 times in 10 cycles then exec "hb_standby"
>> Will it then be guaranteed that if the restart/timeout condition
>> occurs, then the changed timestamp condition/action will also occur?
>> Or is there any potential for funny timing anomalies?
> I have not tested it, i recommend using -v monit option to tune the solution
> ;) If you'll need help, let me know.
> Thanks,
> Martin

Will do. Thanks.

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