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

Joe Topjian joe at topjian.net
Tue Jan 27 16:08:28 UTC 2015


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. :)

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