Hi!
Can anybody tell me where i can find docs about handling network bridges for xen domUs in Fedora 7?
Something changed since FC6, so i cannot figure out how to create simple bridges without dhcp for my xen domUs.
All what i want is: xenbrINTERNET should bridge to eth1 xenbrLAN should bridge to eth0
eth0 and eth1 of my dom0 should also have an IP Address. I do not want routing or nat for my domUs.
Thanks!
regards, christian
On Tue, Jun 05, 2007 at 06:58:31PM +0200, Christian Reiter wrote:
Hi!
Can anybody tell me where i can find docs about handling network bridges for xen domUs in Fedora 7?
Something changed since FC6, so i cannot figure out how to create simple bridges without dhcp for my xen domUs.
Previously there was a xen module called 'netloop' in use. So if you used network-bridge, you'd get 4 interfaces
peth0 - physical device xenbr0 - bridge device vif0.0 - backend of virtual device eth0 - frontend of virtual device
peth0 & vif0.0 would be part of xenbr0
In F7, use of netloop is removed to simplify dom0 config so you only get two interfaces
peth0 - physical device eth0 - bridge device
And peth0 is part of the eth0 bridge.
In both cases, eth0 wouldbe the device that gets the IP addr.
All what i want is: xenbrINTERNET should bridge to eth1 xenbrLAN should bridge to eth0
Calling the bridge xenbrXXXX is deprecated, since we're moving towards a Dom0 config which is able to be the same for both Xen and KVM. Hence we have the generic peth0 & eth0 devices now. That's a minor naming detail though. You should be able to call network-bridge multiple times - once per device you have, just as with Fc6. Alternatively setup briding using the regular init scripts as per section 2 in this doc
http://watzmann.net/blog/index.php/2007/04/27/networking_with_kvm_and_libvir...
Dan.
On Tue, Jun 05, 2007 at 06:23:57PM +0100, Daniel P. Berrange wrote:
On Tue, Jun 05, 2007 at 06:58:31PM +0200, Christian Reiter wrote:
Hi!
Can anybody tell me where i can find docs about handling network bridges for xen domUs in Fedora 7?
Something changed since FC6, so i cannot figure out how to create simple bridges without dhcp for my xen domUs.
Previously there was a xen module called 'netloop' in use. So if you used network-bridge, you'd get 4 interfaces
peth0 - physical device xenbr0 - bridge device vif0.0 - backend of virtual device eth0 - frontend of virtual device
peth0 & vif0.0 would be part of xenbr0
In F7, use of netloop is removed to simplify dom0 config so you only get two interfaces
peth0 - physical device eth0 - bridge device
And peth0 is part of the eth0 bridge.
Oh btw, before anyone asks - we added compatability code to vif-bridge, so if you have any existing guest config files which refer to 'xenbr0' they will automatically join the eth0 bridge device instead. So existing guests are supposed to 'just work' even though the Dom0 network config changed a little.
Dan.
Thanks Daniel, that worked perfect!
One further Question: Is there any way to get rid of the virbr0 Interface? I've already deleted in the virt-manager GUI.
chris
Mit freundlichen Grüßen, /// Kind Regards, Christian Reiter
On Wed, Jun 06, 2007 at 06:27:24PM +0200, Christian Reiter wrote:
Thanks Daniel, that worked perfect!
One further Question: Is there any way to get rid of the virbr0 Interface?
This is the libvirt provided virtual network, connected using NAT, so you can use the virt-manager UI to stop/start the network. Or from the command line you can:
virsh net-destroy default
And to make that permanent
virsh net-autostart --disable default
Dan.
Daniel P. Berrange wrote:
Oh btw, before anyone asks - we added compatability code to vif-bridge, so if you have any existing guest config files which refer to 'xenbr0' they will automatically join the eth0 bridge device instead. So existing guests are supposed to 'just work' even though the Dom0 network config changed a little.
Dan,
I just ran into an issue with this.
I have re-built F8 xen-3.1.2 from SRPM on CentOS 5.1 x86_64 and done a clean kickstart install of CentOS 5.1 x86_64 which pulls in the xen-3.1.2 RPMs from a repo (i.e. xen-3.0.3 is never installed).
I have some guests created using xen-??? on FC6 which I have migrated to a new machine and which use xenbr0.
When I try to start the domains using "xm create -c guestname" I got a message about not finding xenbr0.
So, I changed xenvr0 to virbr0 and the guests start OK and can talk to each other but can not talk to anything on the rest of the network.
I have figured that this is related to the issue discussed in this thread.
How come xenbr0 was not recognised? Do I need to update some other packages, or should I use virsh?
Or do I just configure eth0 as a bridge in Dom0 as described here [1]
Thanks,
R.
[1] http://watzmann.net/blog/index.php/2007/04/27/networking_with_kvm_and_libvir...
Robin Bowes wrote:
How come xenbr0 was not recognised? Do I need to update some other packages, or should I use virsh?
OK, I've answered my own question.
I've rebuilt the following packages from Fedora 8 on CentOS 5.1 x86_64, added them to my own yum repo, then done a clean kickstart install of CentOS 5.1 using my yum repo as a source.
The result? It all seems to be working very nicely! The networking on my old domains (that use xenbr0 in the config files) work without any modification.
These are the packages I re-built:
libvirt-0.4.0-4 virt-viewer-0.0.2-2 xen-libs-3.1.2-1 gtk-vnc-0.2.0-4 libvirt-python-0.4.0-4 python-virtinst-0.300.2-2 xen-3.1.2-1.x86_64
The binaries are in my repo here:
Specifically, here:
http://repo.yo61.net/centos/5/x86_64/RPMS/
Hopefully, this will keep me going for a while!
R.
Thanks Dan!
I'll try as soon as i'm back in the Office and report here.
christian
-
Christian Reiter -
Daniel P. Berrange -
Robin Bowes