GNU bug report logs - #62163
Suppress logging shepherd evaluation in mcron.log

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From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Bruno Victal <mirai <at> makinata.eu>
Cc: Ludovic Courtès <ludo <at> gnu.org>, 62163 <at> debbugs.gnu.org
Subject: bug#62163: Suppress logging shepherd evaluation in mcron.log
Date: Thu, 30 Mar 2023 22:10:31 -0400

Hi,

Bruno Victal <mirai <at> makinata.eu> writes:

> On 2023-03-30 11:22, Ludovic Courtès wrote:
>> Hi,
>> 
>> Bruno Victal <mirai <at> makinata.eu> skribis:
>> 
>>> On 2023-03-28 17:25, Ludovic Courtès wrote:
>>>>
>>>> Nope. :-)  What is ‘my-heartbeat-job’ doing?
>>>
>>> It queries shepherd to see if a service is running and sends a restart if required.
>> 
>> Isn’t that what #:respawn? #t is supposed to do?  :-)
>> 
>> If you find that #:respawn? doesn’t work, then we should fix it.
>
> Oh, I should have explained better here.
> Re-spawn works, it's the (daemon) service that might misbehave/go unresponsive without crashing,
> i.e. HTTP backend stops responding to API requests but the server is still up.
> The job performs a "health-check" and restarts it if it doesn't get the appropriate response.
>
> A concrete situation where this could be of use is for logs.guix that occasionally stops
> recording.

So some kind of supervisor for the job, that specific run time checks to
ensure the process is still doing its job, if I understand correctly.  I
wonder if this use case could be integrated into our Shepherd services
themselves, via some supervisor slot or similar, that would run some
script periodically.

-- 
Thanks,
Maxim

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