Re: xen-unstable on OL6 (RHEL6 clone) problems

[John Haxby <john.haxby@oracle.com>]

On 11/02/11 07:49, Ian Campbell wrote:
> The upgrade notes should continue to consistently point to the relevant
> distro documentation and to provide associated guidance.

I hesitate to just say "me too" but but Ian is dead right here.  The
examples in http://wiki.xensource.com/xenwiki/MigrationGuideToXen4.1+
that Dan has just referred me to are exactly what's needed here.  The
real documentation for RHEL et alia
(/usr/share/doc/initscripts-*/sysconfig.txt) are as close as you'll get
to definitive without reading the shell scripts, but the examples are
the perfect start.

While I'm talking about bridges though, RHEL6 (and clones including OL6)
have a problem with brctl.  RHEL6 adds IGMP snooping support for bridges
and this is provided by kernel patches.  If you're using the xen dom0
kernel this support is not present and brctl complains bitterly and
repeatedly that /sys/class/net/xenbr0/bridge (or similar) doesn't
exist.  What is actually means is that a various files in that directory
don't exist.   Luckily, Fedora 14's bridge-utils-1.2-9.fc13 RPM doesn't
expect the IGMP snooping stuff and works perfectly on the dom0 kernel.  
You could also rebuild the RHEL6 bridge-utils RPM and just miss out
bridge-utils-1.2-Add_IGMP_snooping_support.patch

jch