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
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