[ovs-discuss] Changing OVS versions in XenServer
Justin Pettit
jpettit at nicira.com
Fri Sep 9 07:10:41 UTC 2011
On Sep 8, 2011, at 1:22 AM, David Erickson wrote:
> On 9/7/2011 7:10 PM, Justin Pettit wrote:
>> On Sep 7, 2011, at 5:29 PM, David Erickson wrote:
>>
>>> Is there a specific procedure for moving between OVS versions in XenServer? I've done this a few times, and frequently I find myself in a situation where the xenbr0 device has completely disappeared, and I couldn't find a way to restore it other than re-installing Xen. In particular I believe I've had success doing an rpm upgrade to newer Xen versions, however I think any time I've removed the OVS rpm's to install an older version I've lost the xenbr0 instance. Any tips/suggestions are welcome.
>>
>> Are you losing xenbr0 after you've done the uninstall and before the new install? If so, you probably should switch the networking back-end to "bridge" before you do the uninstall:
>>
>> xe-switch-network-backend bridge
>>
>> After you've done the install, switch it back to OVS:
>>
>> xe-switch-network-backend vswitch
>>
>> As you indicated, a pure RPM upgrade of OVS should work fine.
>>
>> Let us know if I've misunderstood.
>
> I was able to reproduce this. Starting with XenServer release 5.6.100-39215p and an installed version of OVS 1.2.1, I switched the backend to bridge, rebooted, removed the OVS rpms, rebooted, installed the original XS OVS rpm openvswitch-1.0.2-82.1943.i386.rpm, switched the backend to openvswitch, rebooted, and xenbr0 was gone. Any ideas?
Hmm. That's very odd. I assume that networking is fine when you're running the bridge between those two reboots?
--Justin
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