OT: DNS Failover

[Les Mikesell]

On Wed, 2005-08-31 at 12:07, Leonard Isham wrote:

> Are you looking at how to fail over your entire site?  As in
> www.company.com serves up a the IP address for the backup site when
> the primary site is down?
> 
> If so then I don't know of an answer that dosen't include a real short
> TTL and reconfiguring your secondary DNS server as the primary...

If you are looking for failover of the looked-up addresses, in many
cases you can always give out multiple addresses by including them
as A records for the same name.  Browsers seem to be very good at
failing over on the client side if some of the returned addresses
don't work.  For other services you might need a more dynamic
DNS.  F5 makes a very expensive device called 3dns that will test
the services and adjust on the fly.  I think there are some free
varitions of this idea, although the only one I can think of is
the erlang package eddie.

-- 
  Les Mikesell
    lesmikesell at gmail.com