Multiple Domain Web Hosting » Blog Archive » One should now select that cheap multiple domain web hosting companies which employs the DNS round robin technique in conjunction with’failover monitoring’.

One should now select that cheap multiple domain web hosting companies which employs the DNS round robin technique in conjunction with’failover monitoring’.

Posted November 4th, 2009 by admin

The DNS round robin fail over monitoring process starts by a web cheap multiple domain web hosting company setting up one’s site on two or more independent web servers. Thus one’s domain name will therefore have 2 or more IP Addresses assigned to it.

Thereafter the fail over monitor watches one’s web server(s) by dispatching data to a URL one specifies and looks for particular text in the results. Now when an error is returned from one of an IP address, it pulls that IP address out of the list. The DNS thereafter points one’s domain name to the working IP address/s

In case any of the user’s IP’s come back online they are restored to the IP pool. This helps in effectively and safely keeping one’s site online even if one of the web servers is down.
In this case an average failure detection and recovery time with a system is very low with just 15 minutes. However this time varies depending on site’s speed as well as the nature of the failure and also how long other ISP’s cache (save) one’s DNS information.

The time taken for other ISP’s caching one’s information can be manipulated in the fail over monitor by lowering the “time to live” (TTL) cache settings. These are the settings used by other ISP’s in order to determine how long to cache one’s DNS information.

One must also keep in mind the matter of how frequently data is synchronized between his/her website’s servers. Now this comes under the hosting company’s responsibility, and this becomes complicated where databases and user sessions are involved.

The most elegant solution to multi server hosting is very expensive hardware based fail over monitoring systems that point a virtual IP address to other ISP’s, while behind the scenes juggling a number of unique IP addresses on different servers.

This way, the whole issue of ISP’s caching one’s information does not come into play.
Thus in order to get 99.99995% uptime, without spending big amount of money, the technology is readily available and certain proprietary failure monitoring systems are now relatively cheap to apply.

Share and Enjoy: