Re: [Xen-devel] xen-unstable on OL6 (RHEL6 clone) problems

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Feb 09, 2011 at 02:26:00PM -0800, Dan Magenheimer wrote:
> Due to some other commitments, it's been awhile since I've built
> a xen-unstable-based system, and with Oracle Linux 6 (a RHEL6
> clone) just released and with Xen 4.1 in release candidates, I
> decided to install and test on a new machine.
> 
> As I sort-of expected, it's not going real well due to tools
> changes that I don't understand how to get around or fix.  I'm
> not a sysadmin guru so some or all of the problems may be
> trivial, and various googling helped a bit.
> 
> One that I can't figure out is when I try to start xend,
> I get a long sequence of:
> 
> /sys/class/net/virbr0/bridge: No such file or directory
> /sys/class/net/virbr0/bridge: No such file or directory
> /sys/class/net/virbr0/bridge: No such file or directory
> /sys/class/net/virbr0/bridge: No such file or directory
> 
> and networking in a guest fails to work.  This directory
> DOES exist.  And "brctl show" seems to be the source of
> those messages.
> 
> In one semi-related googled link, I found that libvirtd
> may cause some problems, so I disabled that.  No luck,
> but the messages change to:
> 
> /sys/class/net/tmpbridge/bridge: No such file or directory
> 
> and starting xend caused my dom0 networking to go down.
> 
> Any clues?  
>

Dunno if this helps: http://wiki.xen.org/xenwiki/RHEL6Xen4Tutorial


> I'm guessing that I have to manually set up some
> network bridges that I never had to deal with before, but
> don't have any idea how to do that.
> 

Yep, when you use xl toolstack you need to set up the bridges yourself. 
The recommended way in el6 is to use /etc/sysconfig/network-scripts/ifcfg-br* 
scripts. 
Those are documented in the user manuals. 

Something like:

/etc/sysconfig/network-scripts/ifcfg-br0:

DEVICE="br0"
TYPE="Bridge"
BOOTPROTO="dhcp"
ONBOOT="yes"
DELAY=0

/etc/sysconfig/network-scripts/ifcfg-eth0:
DEVICE="eth0"
BOOTPROTO="none"
HWADDR="00:xx:yy:zz:xx:yy"
IPV6INIT="no"
IPV6_AUTOCONF="no"
NM_CONTROLLED="no"
ONBOOT="yes"
BRIDGE="br0"


-- Pasi

> Thanks,
> Dan
> 
> P.S. Don't know if it is related, but I see in dmesg several:
>       XENBUS: Unable to read cpu state
> and a
> 
> virbr0: starting userspace STP failed, starting kernel STP
> 
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> http://lists.xensource.com/xen-devel

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