[ClusterLabs] Antw: Re: Problem with clone ClusterIP

[Ulrich Windl]

>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 25.04.2017 um 17:38 in Nachricht
<d94d9463-2fd8-c916-a052-8c60d2fa681d at redhat.com>:
> 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.

Exactly: In our environment clusterIPs never worked reliable. I think the description of the RA should mention the requirements to avoid confused users, because it's not obvious what the RA really does.

> 
> 
> _______________________________________________
> Users mailing list: Users at clusterlabs.org 
> http://lists.clusterlabs.org/mailman/listinfo/users 
> 
> Project Home: http://www.clusterlabs.org 
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf 
> Bugs: http://bugs.clusterlabs.org