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Failure detection and handling - primary/backup web server
(Simple DNS Plus is another product
from JH Software - http://www.simpledns.com/)
(Mozilla Firefox is a product from the
Mozilla Foundation - http://www.mozilla.org/)
This tutorial will demonstrate what
happen after you have set up Simple Failover and the initial update
of the TTL value in the DNS A-record has been performed by Simple
Failover.
We are also going to show you the
changes and updates in the Simple DNS Plus database, and what the
normal visitor of your Web service is experiencing before and after
the actions performed by Simple Failover.
The setup
 Before any failure at the primary HTTP server, when
everything run as designed.
 The HTTP service running at the primary HTTP server fails.
The tutorial describes what happens when Simple Failover performs
the failure detection and handling, and how the web server users are
redirected automatically.
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