Using DNS, I want to do load balancing of client requests among my
available servers dynamically.
In realtime requirements, any/many servers among the configured me be
down or overloaded.
I want to have control over distribution of load to these servers. I
want to have a common FQDN to the clients and they know only FQDN. I
would like to have 10/20 servers handling the client requests. When
ever a server goes down, all the requests (thousands) it was handling,
should come to remaining available servers quickly (assume within few
seconds).
I feel we can use DNS for this purpose, but doing load balance in
realtime?
I don't believe you will be successful at this with just DNS. The
problem is that you want client connections switched over in case of a
server failure. My understanding is that web browsers will not honor
your TTL's. (This is how it was the last time I operated a production
web server cluster, back in medieval times. I don't see why things
would have changed.)
What you need is a load balancing solution at the HTTP level.
Preferably more than one, such that the devices can share an IP
together in some kind of fault-tolerant way.
Either way, if it were me, I would start my search at the F5 website.
http://www.f5.com/solutions/availability/
Chris Buxton
Professional Services
Men & Mice
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