[Openstack-operators] RHEL 7 / CentOS 7 instances losing their network gateway

Jesse Keating jlk at bluebox.net
Tue Jan 27 16:22:04 UTC 2015

At first guess, I would say it's the client trying to refresh it's lease 
and the lease is coming back without a gateway, due to a bug in dnsmasq. 
Just a guess though.

We are running 12.04 as well, but I don't recall running into this 
situation. We're on Neutron (havana for now, juno very soon) though if 
that makes a difference.


On 1/27/15 8:08 AM, Joe Topjian wrote:
> Hello,
> I have run into two different OpenStack clouds where instances running
> either RHEL 7 or CentOS 7 images are randomly losing their network gateway.
> There's nothing in the logs that show any indication of why. There's no
> DHCP hiccup or anything like that. The gateway has just disappeared.
> If I log into the instance via another instance (so on the same subnet
> since there's no gateway), I can manually re-add the gateway and
> everything works... until it loses it again.
> One cloud is running Havana and the other is running Icehouse. Both are
> using nova-network and both are Ubuntu 12.04.
> On the Havana cloud, we decided to install the dnsmasq package from
> Ubuntu 14.04. This looks to have resolved the issue as this was back in
> November and I haven't heard an update since.
> However, we don't want to do that just yet on the Icehouse cloud. We'd
> like to understand exactly why this is happening and why updating
> dnsmasq resolves an issue that only one specific type of image is having.
> I can make my way around CentOS, but I'm not as familiar with it as I am
> with Ubuntu (especially CentOS 7). Does anyone know what change in
> RHEL7/CentOS7 might be causing this? Or does anyone have any other ideas
> on how to troubleshoot the issue?
> I currently have access to two instances in this state, so I'd be happy
> to act as remote hands and eyes. :)
> Thanks,
> Joe

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