[Pacemaker] Default gateway issues

[Ruben Laban]

On Friday 05 August 2011 at 15:57 (CET), Albéric de Pertat wrote:
> Hi,
> 
> I'm beginning to use pacemaker and I have come across the
> following problem :
> 
> I have two nodes with ips 10.0.9.11/24 and 10.0.9.12/24 routed
> via 10.0.9.254. I have declared an IPaddr resource for
> 10.0.10.10/24. So far so good.
> 
> primitive ip ocf:heartbeat:IPaddr \
>         params ip="10.0.10.10" cidr_netmask="24" nic="eth0" \
>         broadcast="10.0.10.255"
> 
> Then I added a Route resource like so :
> 
> primitive gw ocf:heartbeat:Route \
>         params destination="0.0.0.0/0" gateway="10.0.10.1"
> 
> This also works fine. The problems come if I try to move the
> resources. If I standby the node where ip is running, the
> resources ip and gw will move fine but the first node will be
> left without a default gateway as the Route RA simply deletes it
> when it stops, whether it's been added by the cluster or not.
> 
> I have tried several pacemaker configurations, none of which
> worked, and I am beginning to think I should not have my
> "passive" gateway in the cluster at all. Is there a way to do
> this or should I modify the Route RA so that it saves the gateway
> before replacing it ?
> 
> 
> Thanks for your help

Instead of adding a single default route (0.0.0.0/0), add 2 split-default 
routes: 0.0.0.0/1 and 128.0.0.0/1. These routes will take preference over the 
dafault, but wont "overwrite" it.

Regards,
Ruben Laban