Re: Pattern for multiple subservices and dynamic discovery i.e. VPN

[Oliver Schad <oliver.schad@automatic-server.com>]

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On Thu, 18 Aug 2022 06:04:25 -0400
Davor Ocelic <docelic-skarnet@spinlocksolutions.com> wrote:

> On Thu, Aug 18, 2022 at 11:32:30AM +0200, Oliver Schad wrote:
> How about an approach that would be more tightly integrated
> with s6? For example:
> 
> > - we need an scanning component for the desired state of running
> >   instances (something like 'find /etc/openvpn -name "*conf"')  
> 
> Right, the scanning component would be the key part. Ideally it
> would use inotify so that it doesn't have to poll and also it would
> get the type of event automatically (file created or file deleted).
> 
> After it sees that a change in a directory has occurred (let's say a
> file was added), then it does the following:
> 
> - It creates the appropriate service directory for this particular
>   VPN config (possibly based on a template)
> - It calls s6-svlink or the like to register the new service, which
>   automatically also notifies s6-svscan that a new service has been
>   added

That would just move 3 components to another level but they are
still needed: scanning existing service directories, diffing between
desired and current state and applying - so creating or removing
directories.

I see there a problem with multiple dynamic services. I'm not sure
about concurrency behaviour of updating processes in the service
directory. Maybe Laurent can explain problems in that area, if they
exist.

I'm not sure how complex the supervision itself is - however I would
love to solve the problem without doing supervision on my own. I
thought about your approach as well but it really depends how resilient
an update process is.

Best Regards
Oli

-- 
Automatic-Server AG •••••
Oliver Schad
Geschäftsführer
Hardstr. 46
9434 Au | Schweiz

www.automatic-server.com | oliver.schad@automatic-server.com
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