[Pacemaker] IPaddr2 Netmask Bug Fix Issue

[Dejan Muhamedagic]

Hi,

On Wed, Mar 30, 2011 at 09:26:49AM +0100, Darren.Mansell at opengi.co.uk wrote:
> From: Pavel Levshin [mailto:pavel at levshin.spb.ru] 
> Sent: 25 March 2011 19:50
> To: pacemaker at oss.clusterlabs.org
> Subject: Re: [Pacemaker] IPaddr2 Netmask Bug Fix Issue
> 
>  
> 
> 25.03.2011 18:47, Darren.Mansell at opengi.co.uk: 
> 
> 
> 
> 
> 
> We configure a virtual IP on the non-arping lo interface of both servers
> and then configure the IPaddr2 resource with lvs_support=true. This RA
> will remove the duplicate IP from the lo interface when it becomes
> active. Grouping the VIP with ldirectord/LVS we can have the
> load-balancer and VIP on one node, balancing traffic to the other node
> with failover where both resources failover together.
> 
>  
> 
> To do this we need to configure the VIP on lo as a 32 bit netmask but
> the VIP on the eth0 interface needs to have a 24 bit netmask. This has
> worked fine up until now and we base all of our clusters on this method.
> Now what happens is that the find_interface() routine in IPaddr2 doesn't
> remove the IP from lo when starting the VIP resource as it can't find it
> due to the netmask not matching.

Can you please open a bugzilla and attach hb_report.

Thanks,

Dejan

> Do you really need the address to be deleted from lo? Having two
> identical addresses on the Linux machine should not harm, if routing was
> not affected. In your case, with /32 netmask on lo, I do not foresee any
> problems.
> 
> We use it in this way, i.e. with the address set on lo permanently.
> 
> 
> --
> Pavel Levshin
> 
>  
> 
>  
> 
> Thanks Pavel,
> 
>  
> 
> However, this means I would have to disable LVS support for the
> resource. Which means that to make it work with LVS I have to set
> lvs_support to false.
> 
>  
> 
> Of course, I'll do whatever it takes on my set up to make it work, but
> it's not intuitive for other users.
> 
>  
> 
> Regards
> 
> Darren Mansell
> 

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