[ClusterLabs] Problem with clone ClusterIP

[Ken Gaillot]

On 04/25/2017 09:32 AM, Bratislav Petkovic wrote:
> I want to make active/active cluster with two physical servers.
> 
> On the servers are installed: oraclelinux-release-7.2-1.0.5.el7.x86_64,
> 
> Pacemaker 1.1.13-10.el7, Corosync Cluster Engine, version '2.3.4',
> 
> pcs 0.9.143. Cluster starts without a problem and I create a resource
> 
> ClusterIP that is in the same subnet as the IP addresses of the servers.
> 
> After creating I access ClusterIP without problems, but I clone ClusterIP
> 
> I can no longer access the this IP.
> 
> I did everything according to instructions from clusterlab.
> 
> Each server has two network cards that are on the teaming with LACP.
> 
>  
> 
> Best regards,
> 
>  
> 
> Bratislav Petkovic

IPaddr2 cloning depends on a special feature called multicast MAC. On
the host side, this is done via iptables' clusterip capability. However
not all Ethernet switches support multicast MAC (or the administrator
disabled it), so that is a possible cause.