[Openstack] Mirantis instances lose IPs frequently

Raja T Nair rtnair at gmail.com
Sun Aug 6 14:07:41 UTC 2017

Hello All,

Mirantis version 7.0
ovs version: 2.3.1-1~u14.04

Some more reading on this points to possible bugs in ovs versions and
advise to upgrade the same.
Eg: Redhat solution doc 2104871.

Can someone put some more light on this?

If needed, is there a way for me to upgrade the ovs packages and
dependencies alone, while leaving rest of the cluster intact? Any help on
this is highly appreciated.


On Friday, 4 August 2017, Raja T Nair <rtnair at gmail.com> wrote:

> Hello All,
> Mirantis version 7.0
> ovs version: 2.3.1-1~u14.04
> Lately we observe that many instances lose IPs and they never get it back
> even after reboot. On a detailed check on the compute nodes where this
> happened, we noticed the openflow dropping packets.
> This command's output shows lot of ``dropped'' status.
> #ovs-ofctl dump-flows br-int
> And #ovs-ofctl del-flows br-int
> and a subsequent reboot of problem instances seem to fix the issue and
> instances regain their IPs.
> We really don't know why the corruption/drop happens and how it got fixed.
> Trying to understand this issue a bit deeper. Can someone help me with
> this?
> Is there a better way to address this problem?
> Best Regards,
> Raja.
> --
> :^)

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