I currently have two web servers. Each located on different ISP.
Seeing how DNS round robin only provides load balancing and not redundancy,
I wanted to go with another option. I found this article from ‘wight-hat.com ‘that suggested
to put the put the DNS service on each web server. And modify the name servers on the
original DNS server. Name Server 1 will point to Web server 1 and Name Server 2 will point
to Web Server 2. In this Case if the DNS is unable to reach it’s Name Server 1
“Also the Web Server 1” then it will try to contact the Name Server 2 “Also Web Server 2”.
All hosts (A records) will supply the correct IP address to contact the available web server.
Is this a viable option?
What are the pro and cons to doing this?
The article can be found here
PS Web server runs on Windows 2003 IIS 7.0
Thanks in advance
DNS Global Load Balancing is a great method; however, the method they use: http://www.wight-hat.com/guides/hosting6.html
I would not recommend(I would not use their method in my environment!); you need a solution that contains healthchecks for the servers; if you want a reliable, efficient and scalable load balanced environment, then you need s system specifically designed for that. The method they use still imposes delay due to the necessary re-query.
Some Vendors that offer DNS Global load balancing: