Re: MONITRC run time updation causing MONIT to freeze.

The problem might be related to a monit reload race condition [1] which was fixed in Monit 5.27.1. 

1. https://bitbucket.org/tildeslash/monit/issues/928


> On 28 Oct 2020, at 01:17, Kannamraju P <[email protected]> wrote:
> 
> Hi All,
>   I am running into a race condition , when I try to dynamically update monitrc externally while MONIT is running , here is my use case
> 
> 1. MONIT setup in daemon mode with 5 sec polling timeout . It  has a set of static services defined in the default MONITRC file.
> 2. Default  Monitrc includes one more custom config file ex: monitrc_custom file 
>    ."include /etc/monitrc_custom"
> 
>     a) In this custom monitrc file , services get added and deleted dynamically by an external process
>     b) Any updation to monitrc is followed by monit reload, so that MONIT picks up the updated service details
> 
>   With this setup I am observing that when both external service and monit try to access the custom monitrc file , MONIT is getting stuck . 
> It becomes non responsive  and "Monit summary" results in all processes stuck in initializing state .
> 
> ex:
> 
> 
> 
> 
> Is there a way I can apply some locking mechanism to avoid the contention of both external processes and monit accessing 
> config files at same time ?
> 
> 
> -- 
> thanks & Regards,
> Raju