Re: [Xen-users] lost network connectivity after update to 3.0.3

[Paul Theodoropoulos <paul@xxxxxxxxxxxxxx>]

Joseph L. Casale wrote:
> > my apologies for my broken nomenclature. when i refer to 'domU' i should
> > have been referring to 'dom0'. i'm fairly new to xen, if that wasn't
> > already obvious!
> >     
> Dom0 is reachable I presume, whats the output of #`brctl show` ?
>
> I havent used the distro supplied Xen from CentOS in so long, but is it possible
> that the network scripts changed?
>
> Cat your xend-config.sxp for network-script, see what network script your using:
> # cat /etc/xen/xend-config.sxp | grep network
> (network-script multi-network-bridge)
>
> Cat that script, see what bridge names it uses:
> # cat /etc/xen/scripts/multi-network-bridge
> "$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=eth0
> "$dir/network-bridge" "$@" vifnum=1 netdev=dummy0 bridge=dummy0
> .
> .
> .
> Cat a vm's config, see what it wants to use:
> # cat /etc/xen/builder.pv | grep vif
> vif = [ 'bridge=eth0, mac=00:16:3E:77:A5:D7', ]
>
> Long shot, but if Dom0 can see the rest of the lan, I know xen changed this 
> somewhere along the line. I doubt RH did but worth a try.
>
> jlc
>   
thanks for the reply. i did include the 'brctl show' output, but it was 
kind of buried in the diagnostics. your reply - plus Fangfei Zhou's - 
got me going in the right direction. i ran 
/etc/xen/scripts/network-bridge status, and it showed that there was no 
peth0.  so i took a leap and ran /etc/xen/scripts/network-bridge start - 
poof, there's my networking. the question is, why isn't this happening 
when the server boots. it's not a huge issue to do it by hand, really, 
since it's rare that the dom0 gets rebooted. but it's peculiar that it's 
not happening automatically as it did before.
my /etc/xen/xend-config.sxp had

(network-script network-bridge)

in it. i changed it to

(network-script '/etc/xen/scripts/network-bridge netdev=eth0')

but that made no difference- after a reboot, the networking was still down.

since i'm not 97% back in business - one of the things i had 
contemplated as a 'fix' was to install xen 3.2 from source. are there 
any risks in upgrading from 3.0.3 to the latest? more broken things, 
fewer, the same?
--
Paul Theodoropoulos

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