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Re: [Xen-users] XEN not working after reboot

  • From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
  • Date: Mon, 22 Jul 2013 23:12:02 +0200
  • Cc: xen-users <xen-users@xxxxxxxxxxxxx>
  • Delivery-date: Mon, 22 Jul 2013 21:13:37 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

On Fri, Jul 19, 2013 at 10:48 AM, Rudi Ahlers <Rudi@xxxxxxxxxxx> wrote:
> On Fri, Jul 19, 2013 at 10:09 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
> wrote:
>> Please keep the list in the loop. Re-adding CC.
> Sorry, forgot to hit "Reply all".
>> On Fri, 2013-07-19 at 09:51 +0200, Rudi Ahlers wrote:
>>> Yes, this server has been running XEN for about 3 years now. It was
>>> rebooted 87 days ago, if I remember correctly for some updates. This
>>> is an active XEN server with 3 XEN domU virtual machines service
>>> websites to clients on the internet.
>> It seems entirely possible to me that some reconfiguration in the
>> previous 87 days wasn't applied in a way which would survive a reboot.
> I've always relied on "yum update" for updates and haven't run into
> this kind of problem before. So, could it be that there's an upstream
> bug, either in Scientifc Linux, or XEN's rpm's that could cause this?
> I don't know where to search, since when I searched on the error I got
> a lot of older posts relating to setting up XEN from scratch.
>>> I've managed to "fix it" by manually creating the bridge, but then I
>>> loose network connectivity to the remote server, and I don't have a
>>> KVM connection to it. ... yet at least.
>> I think that needs to be a priority for you unless there is a second
>> Ethernet device available (in which case you may be able to fix eth0
>> while logged in via eth1).
> I'm still waiting for the DC to setup the KVM. They had to move "the
> whole DC to a new building", including networking gear and a boat load
> full of servers. And they're still busy moving everything, so for now
> I have limited access and limited tools at my disposal.
> I'll see if I can get another LAN cable hooked upto eth1 in the mean time.
>>> These commands re-create the bridge, but then the host node's
>>> networking doesn't work, although the VM's come up about 10 minutes
>>> later. The thing is, I can't see what's going on after running "brctl
>>> addif xenbr0 eth0". The firewall is disabled right now, so it's not
>>> blocking anything.
>>> brctl addbr xenbr0
>>> brctl stp xenbr0 off
>>> brctl setfd xenbr0 0
>>> ip link set xenbr0 up
>>> brctl addif xenbr0 eth0
>> None of these will transfer the ip configuration from eth0 to xenbr0,
>> which is necessary for host networking to work.
> Ok, so what else should I have done in order to transfer the IP
> configuration from eth0 to xenbr0?
> Right now I can ping the server but it doesn't respond to SSH, webmin
> (used for other purposes, locked to internal IP's) or any of the other
> network services
>> If you are using a CentOS like environment then this should all have
>> been done by your ifcfg scripts, or perhaps the network-bridge stuff if
>> you are still using that.
>> Have you compared this system's configuration with that of another
>> working server?
>>> I have googled that error, but the results I got all related to people
>>> who just setup XEN and the bridge wasn't setup in the config. The
>>> problem is, that it was setup, a few years ago already so the steps of
>>> adding the bridge to the bridge-network script doesn't apply here.
>> It sounds to me very much like someone has broken this configuration on
>> this server and nobody noticed until it was rebooted. I would suggest
>> starting from that assumption and double checking everything going
>> through as you would an initial setup.
>> Ian.
> No one really works on the host servers, apart from doing a yum update
> from time to time and I can't see any reason why anyone would have
> touched the XEN configuration or setup at all. "why fix it if it aint
> broken"?

Can anyone help me with this please?

I have compared this setup to a working server but can't see why the
network bridge isn't working

Kind Regards
Rudi Ahlers

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Cell: 082 554 7532
Fax: 086 268 8492

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