[Openstack-operators] Live migration neutron issues

Mathieu Gagné mgagne at internap.com
Thu Jan 7 20:36:50 UTC 2016

On 2016-01-07 3:28 PM, Adam Dibiase wrote:
> Greetings, 
> I am having connectivity issues to instances after live migrating
> between compute nodes. Scenario is as follows:
>   * Start pinging instance IP
>   * Send nova live-migration <instancename> <computenode>
>   * Once nova reports the pause/resume on the new compute node after
>     migration, ping replies stop
>   * Instance migrates successfully and I can hit it via VNC console, but
>     no network connectivity
>   * If I live migrate it back to losing compute node, it will still NOT
>     restore network connectivity
>   * The only way to restore network is to nova stop/start or nova reboot
>     instance
>   * When the instance comes back up, I am able to hit it again on the
>     new compute node
> I have checked to see if the neutron port is showing the new
> binding:host_id, ovs shows the correct port for instance on new compute
> node, and no other errors present in the logs.
> I am running Liberty with cinder FYI. Anyone else having similar issues?

Have you tried starting another instance on the same L2 network and ping
from there once it's migrated? This is to make sure it's not an issue
with ARP caching on a device between you and the instance.


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