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

Joe Topjian joe at topjian.net
Tue Jan 27 19:25:00 UTC 2015

Thanks, Kris. I'm going to see if there's any oddities between the version
of dnsmasq packaged with 12.04/Icehouse and systemd-dhcp.

On Tue, Jan 27, 2015 at 9:25 AM, Kris G. Lindgren <klindgren at godaddy.com>

>  I can't help as we use config-drive to set networking and are just
> starting to roll out Cent7 vm's.  However, a huge change from Cent6 to
> Cent7 was the switch from upstart/dhclient to systemd/systemd-dhcp.
>  ____________________________________________
> Kris Lindgren
> Senior Linux Systems Engineer
> GoDaddy, LLC.
>   From: Joe Topjian <joe at topjian.net>
> Date: Tuesday, January 27, 2015 at 9:08 AM
> To: "openstack-operators at lists.openstack.org" <
> openstack-operators at lists.openstack.org>
> Subject: [Openstack-operators] RHEL 7 / CentOS 7 instances losing their
> network gateway
>   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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