IPC between vimage instances?

[Milan Obuch]

On Monday 13 June 2005 13:46, Ragnar Lonn wrote:
> Julian Elischer wrote:
> > Ragnar Lonn wrote:
> >> Hello,
> >>
> >> I've been using vimage on FreeBSD 4.11 along with Netgraph to setup a
> >> system
> >> that simulates many physical client machines for the purpose of
> >> testing broadband
> >> Internet access hardware. I have hundreds of vimages, each with its
> >> own ngeth0
> >> network interface connected via Netgraph to a real physical
> >> interface. It is working
> >> very well indeed but now I'm trying to setup logging from the various
> >> vimage
> >> instances and have run into problems. Each vimage runs applications that
> >> I want to log the output from in an orderly manner. I'd like to use
> >> syslog but as
> >> it turns out, the processes inside a vimage cannot communicate with
> >> the syslogd
> >> in the "default" vimage. I tried logging to the Unix domain socket
> >> /var/run/log but
> >> that didn't work from within a vimage (other than "default" of course).
> >
> > did you ask syslog to open sockets in all the chroots?
> > I assume yes.. I hadn't realised that the vimage code separates
> > unix domain sockets etc. but I guess that makes sense.
>
> Actually, I don't chroot the vimages as of now. They see the same
> filesystem all of them but writing to the syslogd unix domain socket didn't
> work anyhow.
> I'm both happy and frustrated at seeing how well separated vimages are
> sometimes :-)
>

Are you talking about Marko Zec's network virtualisation patch? If yes, then 
you need one simple patch to allow AF_UNIX (named pipes) to work between 
images. I do not have it at hand now, but if you need it, I could search my 
archives...
Regards,
Milan