--On Friday, March 22, 2013 1:31 PM -0400 Dan Ritter <[email protected]>
wrote:
The next best method would be to use a group of DNS servers that
had failover for the service IP address. There's no need for
You don't need or want failover for caching name servers. DNS clients have
fault tolerance built in.
If you have a hot/cold cluster and one node fails then the other node will
have an empty cache when it spins up. You also have no DNS at all for
however long it takes for the cold node to spin up.
If you have a hot/hot pair with no failover then each node will have some
cached data. If a node fails then you still have the other node's cache.
There is no down time waiting for a cold node to spin up. The DNS clients
will automatically rotate through their resolver lists when nodes are
unreachable.
If you shuffle the resolver lists on each client node then you get the
benefits of a load balancer for zero cost.
--
Rich P.
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