Dear Laurent, thanks a lot for your quick response. I understand, that dynamic discovery needs some thoughts to implement in an easy and flexible way.
Just to understand the requirements, if we want to implement that today: - we need an scanning component for the desired state of running instances (something like 'find /etc/openvpn -name "*conf"') - we need an scanning component for the current state in process list - we need a diffing component - we need a state applier component A component could be a shell function. Applying state would mean to fork and exec. A process tree would look like /usr/bin/s6-svscan s6-supervise vpn-manager vpn-manager openvpn foo1.conf openvpn foo2.conf Best Regards Oli On Wed, 17 Aug 2022 11:04:50 +0000 "Laurent Bercot" <ska-supervis...@skarnet.org> wrote: > > > >I'm looking for a pattern to solve a problem, where you have to > >discover dynamically the services you have to start. > > > >Examples could be VPN configurations, where you discover the > >configuration files and start for every file an instance of the VPN > >service. > > Hi Oliver, > > Dynamic instantiation is a real pain point - it's an often requested > feature, but it's surprisingly hard to make it work correctly and > safely in a supervision scheme. Supervision works very well in static > environments, but dynamic discovery is at odds with the architecture. > > I have a few ideas to mitigate that and help people create instanced > services. Instantiation is a planned feature of the future s6-rc v1 > but it's still a ways away; I am also thinking of adding tools to help > people handle instances with regular s6, amd they may come in the near > future, but there are currently no such helpers, sorry. > > -- > Laurent > -- Automatic-Server AG ••••• Oliver Schad Geschäftsführer Hardstr. 46 9434 Au | Schweiz www.automatic-server.com | oliver.sc...@automatic-server.com Tel: +41 71 511 31 11 | Mobile: +41 76 330 03 47
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