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

George Shuklin george.shuklin at gmail.com
Tue Jan 27 20:38:24 UTC 2015

How many network interfaces have your instance? If more than one - check 
settings for second network (subnet). It can have own dhcp settings 
which may mess up with routes for the main network.

On 01/27/2015 06:08 PM, 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
> _______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
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