[CentOS] Load balancing...

[Charles Polisher]

m.roth at 5-cent.us wrote:

> A warning: round robin can be problematical.

Amen. Consider what happens with round-robin DNS when one host 
stops working. Round-robin DNS will hand out the address of the
failed host just as often as it did when it was all working.
Some clients (applications) will attempt to use another one
of the IP addresses they get from the DNS, some won't. 

A load balancer checks the health of the hosts and doesn't^Wshouldn't
route traffic to hosts that aren't serving requests.

There are other considerations for round-robin DNS. As
you'll want to make the TTL's very small, you must expect
much more DNS traffic, so expect more load on the DNS.

-- 
Charles Polisher