Pkg xen devel - Jan 2012 - Bug#655581: xen-utils-common: network-bridge breaks the network setup when using ethernet bonding.

Package: xen-utils-common
Version: 4.0.0-1
Severity: important


If using ethernet bonding and network-bridge with xen the network-bridge scripts
breaks the network.

I have run through the commands manually in irder to establish the culprit.
In the op_start function (Starting on line 214) everything is fine up until line
251.
At this point the bridge has been created, devices renamed and the network is
fine, but then
it runs do_ifup {$bridge}. In this function on line 111 it does ifup $1.
This breaks everything.
My solution is to surround the do_ifup ${bridge} line with a condition:
if [ ! -n "${slaves}" ]; then
    do_ifup {$bridge}
fi

-- System Information:
Debian Release: 6.0.3
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/16 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages xen-utils-common depends on:
ii  gawk                    1:3.1.7.dfsg-5   GNU awk, a pattern scanning and pr
ii  lsb-base                3.2-23.2squeeze1 Linux Standard Base 3.2 init scrip
ii  udev                    164-3            /dev/ and hotplug management daemo
ii  xenstore-utils          4.0.1-4          Xenstore utilities for Xen

xen-utils-common recommends no packages.

xen-utils-common suggests no packages.

-- Configuration Files:
/etc/default/xendomains changed:
XENDOMAINS_SYSRQ=""
XENDOMAINS_USLEEP=100000
XENDOMAINS_CREATE_USLEEP=5000000
XENDOMAINS_MIGRATE=""
XENDOMAINS_SAVEXENDOMAINS_SHUTDOWN="--halt --wait"
XENDOMAINS_SHUTDOWN_ALL="--all --halt --wait"
XENDOMAINS_RESTORE=true
XENDOMAINS_AUTO=/etc/xen/auto
XENDOMAINS_AUTO_ONLY=false
XENDOMAINS_STOP_MAXWAIT=300

/etc/xen/xend-config.sxp changed:
(network-script network-bridge)
(vif-script vif-bridge)
(dom0-min-mem 196)
(enable-dom0-ballooning yes)
(total_available_memory 0) 
(dom0-cpus 0)
(vncpasswd '')


-- no debconf information

-- 
The Sunday Times Scottish University of the Year 2009/2010
The University of Stirling is a charity registered in Scotland, 
 number SC 011159.

Your message dated Thu, 12 Jan 2012 16:50:34 +0100
with message-id <20120112155034.GB9722 at wavehammer.waldi.eu.org>
and subject line Re: [Pkg-xen-devel] Bug#655581: xen-utils-common:
network-bridge breaks the network setup when using ethernet bonding.
has caused the Debian Bug report #655581,
regarding xen-utils-common: network-bridge breaks the network setup when using
ethernet bonding.
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
655581: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=655581
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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From: Philip Ward <p.g.ward at stir.ac.uk>
Subject: xen-utils-common: network-bridge breaks the network setup when using
ethernet bonding.
Date: Thu, 12 Jan 2012 14:04:20 +0000
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From: Bastian Blank <waldi at debian.org>
Subject: Re: [Pkg-xen-devel] Bug#655581: xen-utils-common: network-bridge breaks
the network setup when using ethernet bonding.
Date: Thu, 12 Jan 2012 16:50:34 +0100
Size: 1958
URL:
<http://lists.alioth.debian.org/pipermail/pkg-xen-devel/attachments/20120112/0d0922a8/attachment-0001.mht>

Thanks for looking into this. I have had a look at the README.debian 
that comes with the package, and indeed it states that adding 
(network-script network-bridge) may or may not work.

However the instructions for setting up Xen on Squeeze at 
http://wiki.debian.org/Xen#Installation_on_squeeze tells users to 
uncomment the network-bridge line in xend-config.sxp and to build your 
own bridge if it does not work.

Should the wiki page be updated to tell users not to use the xen scripts 
and instead build their own bridges?

If so I'll email the maintainer of the wiki page.

Phil.

On 12/01/12 15:54, Debian Bug Tracking System wrote:
> This is an automatic notification regarding your Bug report
> which was filed against the xen-utils-common package:
>
> #655581: xen-utils-common: network-bridge breaks the network setup when
using ethernet bonding.
>
> It has been closed by Bastian Blank<waldi at debian.org>.
>
> Their explanation is attached below along with your original report.
> If this explanation is unsatisfactory and you have not received a
> better one in a separate message then please contact Bastian Blank<waldi
at debian.org>  by
> replying to this email.
>
>
-- 
Philip Ward
Unix Systems Administrator
01786 467274 (ext 7274)

-- 
The Sunday Times Scottish University of the Year 2009/2010
The University of Stirling is a charity registered in Scotland, 
 number SC 011159.

On Thu, 2012-01-12 at 14:04 +0000, Philip Ward wrote:
> Package: xen-utils-common
> Version: 4.0.0-1
> Severity: important
> 
> 
> If using ethernet bonding and network-bridge with xen the network-bridge
scripts breaks the network.
Probably the best thing to do is not to use this script and setup your
host networking directly, per
http://wiki.xen.org/wiki/HostConfiguration/Networking .

As you've observed the machinations which the network-bridge script goes
through to try and tear down and rebuild the network config is fraught
with difficulties and nasty corner cases, that is why we upstream have
deprecated the network-* scripts in favour of recommending the use of
the distro provided network configuration tools.

Ian.
> 
> I have run through the commands manually in irder to establish the culprit.
> In the op_start function (Starting on line 214) everything is fine up until
line 251.
> At this point the bridge has been created, devices renamed and the network
is fine, but then
> it runs do_ifup {$bridge}. In this function on line 111 it does ifup $1.
> This breaks everything.
> My solution is to surround the do_ifup ${bridge} line with a condition:
> if [ ! -n "${slaves}" ]; then
>     do_ifup {$bridge}
> fi
> 
> -- System Information:
> Debian Release: 6.0.3
>   APT prefers stable
>   APT policy: (500, 'stable')
> Architecture: amd64 (x86_64)
> 
> Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/16 CPU cores)
> Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> 
> Versions of packages xen-utils-common depends on:
> ii  gawk                    1:3.1.7.dfsg-5   GNU awk, a pattern scanning
and pr
> ii  lsb-base                3.2-23.2squeeze1 Linux Standard Base 3.2 init
scrip
> ii  udev                    164-3            /dev/ and hotplug management
daemo
> ii  xenstore-utils          4.0.1-4          Xenstore utilities for Xen
> 
> xen-utils-common recommends no packages.
> 
> xen-utils-common suggests no packages.
> 
> -- Configuration Files:
> /etc/default/xendomains changed:
> XENDOMAINS_SYSRQ=""
> XENDOMAINS_USLEEP=100000
> XENDOMAINS_CREATE_USLEEP=5000000
> XENDOMAINS_MIGRATE=""
> XENDOMAINS_SAVE> XENDOMAINS_SHUTDOWN="--halt --wait"
> XENDOMAINS_SHUTDOWN_ALL="--all --halt --wait"
> XENDOMAINS_RESTORE=true
> XENDOMAINS_AUTO=/etc/xen/auto
> XENDOMAINS_AUTO_ONLY=false
> XENDOMAINS_STOP_MAXWAIT=300
> 
> /etc/xen/xend-config.sxp changed:
> (network-script network-bridge)
> (vif-script vif-bridge)
> (dom0-min-mem 196)
> (enable-dom0-ballooning yes)
> (total_available_memory 0) 
> (dom0-cpus 0)
> (vncpasswd '')
> 
> 
> -- no debconf information
> 
-- 
Ian Campbell
Current Noise: Monster Magnet - Take It

I tell ya, I was an ugly kid.  I was so ugly that my dad kept the kid's
picture that came with the wallet he bought.
		-- Rodney Dangerfield