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From: Wayne Marshall <wcm@b0llix.net>
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Subject: Re: [announce] perp-2.03: persistent process supervision
Date: Mon, 14 Mar 2011 15:02:25 +0100
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To: Laurent Bercot <ska-supervision@skarnet.org>
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Hi Laurent,

>  I just have a question about your design:
> 
> >  * easy configuration: in place service activation and no
> >    symlinks!
> 
>  Does that mean that perpd stores all the service states in
> memory ? To control or check on services, perpctl and other
> utilities connect to perpd via the Unix domain socket, right ?

Yes.
 
>  So... the dreaded question... what happens if perpd dies ?
> Will perpboot restore a sane supervision tree ?
> 

Yes.

First, perpd(8) won't die :)

If perpd(8) receives SIGTERM, it runs a controlled shutdown of
all services under its supervision, and then terminates itself.

Under normal (default) configurations, whenever perpd(8)
terminates it is restarted by either perpboot(8), or init(8) with
a "respawn" configuration in inittab(5).  perpd(8) then
restarts all services marked for activation in /etc/perp.

Wayne