[systemd-devel] Running a set of group isolated from other services?

[Benno Fünfstück]

Great, thanks!

Lennart Poettering <lennart at poettering.net> schrieb am Sa., 29. Apr. 2017,
19:32:

> On Wed, 26.04.17 11:08, Benno Fünfstück (benno.fuenfstueck at gmail.com)
> wrote:
>
> > > I have the problem that I want to run a set of services that are
> isolated
> > > from the other services. In particular, I'd like to:
> > >
> > > * share some environment variables between these services, that aren't
> > > available for services outside the group
> > > * be able to stop all the services in the group and wait for proper
> > > shutdown
> > > * (would be nice) load services for the group from a different
> directory
> > > than the default one
> > > * (would be nice) be able to add transient services to the group with
> > > systemd-run
> > >
> > > Is such a thing possible with systemd? If not, is it feasible to
> implement
> > > something like this (even if it doesn't match exactly what I want)?
> > >
> > > Regards,
> > > Benno
> > >
> >
> > Just to add if that wasn't clear: I'd like to run this group for multiple
> > different sets of environment variables, and be able to "start" the group
> > for some assignment of environment variables (these variables will not
> > change during the lifetime of the group though)
>
> If you want multiple instantation you can use systemd's instance
> logic. i.e. you could have:
>
>        mygroup at .target
>
> This target unit could then have Wants= deps on your various services,
> always passing along the instance identifier:
>
>         [Unit]
>         Wants=myservice1@%i.service myservice2@%i.service
>
> Then, insce the service units you'd add a PartsOf= dep back:
>
>         [Unit]
>         PartOf=mygroup@%i.target
>
> And then pull in the environment file based on the instance:
>
>         [Service]
>         EnvironmentFile=/path/to/my/env-file-%i.conf
>
> I hope that makes sense,
>
> Lennart
>
> --
> Lennart Poettering, Red Hat
>
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