[Linux-cluster] IP-based tie-breaker on a 2-node cluster?

[Bennie Thomas]

Let's say you have 2-nodes. "nodeA" and "nodeB" (this is how the public 
sees them). create "private" nodenames
like "nodeAe" and "nodeBe". Add the nodenames to both hosts files,  make 
sure the private interfaces are set up
with private addresses, reconfigure your cluster to use the "private" 
nodename. Then if you want a Cluster Alias IP address
that is known to the public you assign another public address as a 
resource then add it to a service.


Andrew Lacey wrote:
>> If you have a spare NIC, and the nodes are next to each other, you could
>> make them use a cross-over cable for their cluster communication, so they
>> would notice that they are both still up even when the switch dies. That's
>> what I do.
>>     
>
> I had considered this option but I haven't tried it. One thing I was
> wondering is how the cluster knows which network interface should get the
> cluster service IP address in that situation. Right now, I don't have
> anything in my cluster.conf that specifies this, but it just seems to
> work. I figured that if I tried to use a crossover cable, what I would
> need to do is use /etc/hosts to create hostnames on this little private
> network (consisting of just the 2 nodes connected by a cable) and use
> those hostnames as the node hostnames in cluster.conf. If I did that,
> would the cluster services try to assign the cluster service IP to the
> interface with the crossover cable (when obviously what I want is to
> assign it to the outward-facing interface)?
>
> -Andrew L
>
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