Xen users - Feb 2012 - Query - Issue creating VMs when not using bridge that Xen created, but using ovswitch.

*Hello,*

I have installed Xen as Hypervisor with OpenSUSE running in Dom0. I want to
use ovswitch (ovs) instead of the bridges that Xen created. In order to do
so, I installed ovs in dom0 just like for the plain Linux.

Xen has replaced eth0 with peth0, and has created a bridge named eth0. And
eth0 is connected peth0 interface , vif2.0 interface (VM), and everything
is working fine. Now I delete the VM.

Now, for OVS, I have deleted the bridge eth0, I have created an ovs bridge
named br0 using ovs-vsctl and connected it with peth0.
I comment the lines for network bridging & vif bridging.
#(network-script network-bridge)
#(vif-script vif-bridge)
And restart the xend.


Then, when I create a VM( By Yast), I get an error,

Failed to start the VM.
Error: Device 0 (vif) could not be connected. hotplug scripts not working

What should I do, if I want to run OVS as my bridge, and XEN VMs.

*
----------------------------
Thanks & Regards
Mohit Dhingra
*


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Mohit Dhingra wrote:
>Xen has replaced eth0 with peth0, and has created a bridge named 
>eth0. And eth0 is connected peth0 interface , vif2.0 interface (VM), 
>and everything is working fine. Now I delete the VM.
>
>Now, for OVS, I have deleted the bridge eth0, I have created an ovs 
>bridge named br0 using ovs-vsctl and connected it with peth0.
>I comment the lines for network bridging & vif bridging.
>#(network-script network-bridge)
>#(vif-script vif-bridge)
>And restart the xend.
You will need a vif-script defined - and unless you find someone 
who''s already done one, then you''ll have to write it yourself.
"network-script" is deprecated in favour of using host OS tools - so 
you are correct to comment that out.

But "vif-script" will be needed - and it will need to do whatever is 
required to create a VIF and connect it to the right virtual switch.

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

Thanks Simon. Yes I have done like what you said (commented out
(network-script network-bridge) , but not vif-bridge), and that makes sense
as well because I need to configure virtual interfaces.

And, I just relplaced one line in xen-network-common.sh
 brctl addif ${bridge} ${dev}
with
 ovs-vsctl add-port ${bridge} ${dev}

And, I am able to connect virtual interfaces with new bridge eth0 (created
manually by me by ovs-vsctl). Everything works fine :) :)

But QoS controls by ovs tools are not being reflected in the connection to
VMs :( I set maximum ingress rate of 1Mbps, but still I get 90Mbps in
Netperf test.

Also,I want to put it in a script, which should run before xen scripts at
the boot time, (run level 3 & 5, right? And why twice ?). Where should I
put up the my script, and how do I make sure it runs before Xen scripts.
Also, I put up few echo statements in xen script file, where do i see the
print? which log file?

*
----------------------------
Thanks & Regards
Mohit Dhingra
+919611190435*


On 11 February 2012 01:02, Simon Hobson <linux@thehobsons.co.uk> wrote:
> Mohit Dhingra wrote:
>
>  Xen has replaced eth0 with peth0, and has created a bridge named eth0.
>> And eth0 is connected peth0 interface , vif2.0 interface (VM), and
>> everything is working fine. Now I delete the VM.
>>
>> Now, for OVS, I have deleted the bridge eth0, I have created an ovs
>> bridge named br0 using ovs-vsctl and connected it with peth0.
>> I comment the lines for network bridging & vif bridging.
>> #(network-script network-bridge)
>> #(vif-script vif-bridge)
>> And restart the xend.
>>
>
> You will need a vif-script defined - and unless you find someone
who''s
> already done one, then you''ll have to write it yourself.
"network-script"
> is deprecated in favour of using host OS tools - so you are correct to
> comment that out.
>
> But "vif-script" will be needed - and it will need to do whatever
is
> required to create a VIF and connect it to the right virtual switch.
>
> --
> Simon Hobson
>
> Visit
http://www.**magpiesnestpublishing.co.uk/<http://www.magpiesnestpublishing.co.uk/>for
books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
>
> ______________________________**_________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
>
http://lists.xensource.com/**xen-users<http://lists.xensource.com/xen-users>
>

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