IPC between vimage instances?

[Julian Elischer]

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.


As you mention, the usual answer is to get the syslog on each system to
forward everything to one logging system.

 you could add a second interface to each vimage just for logging to
keep it separate from the testing..


>
> What ways are there to do IPC between applications in different vimages?
>
> I know I can connect them using Netgraph and virtual network 
> interfaces but
> setting up more network interfaces means a lot of housekeeping as 
> those interfaces
> can't be removed when I remove vimages from the system. I dont want to 
> send
> actual traffic out onto the network either, as that might interfere 
> with the test
> traffic to/from the machine.
>
> Any ideas?
>
> Regards,
>
>  /Ragnar
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