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



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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