DNS Load Balancing - What, Why and How?

The Domain Name System (DNS) lets your computer convert websites such as www.bluecatnetworks.com into IP addresses so that the system can effectively identify the page you want to see and load it for you. DNS is also used wherever domain names are used such as while sending e-mails.

Why do you need load balancing?

So, let's say you have a website and over a short period, it becomes extremely popular. Everyone wants to view it and it's a huge success! There's one problem though. As the number of visitors increase, the time taken to load your page increases if you do not have a proper load balancing system.

Your server can only handle a particular number of requests and when this is exceeded, the performance goes down. This could lead to people losing interest in your site.

So, what is Load Balancing?

DNS Load Balancing is an important technique that can help you service the requests when the number of visitors of your website grows - to thousands or even millions! The Load Balancer is situated before the web server and is configured to hold the information about the web servers in your infrastructure, which server services which geographical location, maximum load that a server can take, etc.

How does it work?

The load balancer identifies which servers receive excess traffic and uses its balancing pools to split the traffic among other web servers based on the geographic locations. The load balancer also performs periodic health checks on the server to see if the server is healthy and if it finds out that it is not, it automatically uses other servers to handle the requests and puts this server in failover mode.

This way the load balancer ensures an extremely high hit rate. The load balancer also smartly works to reduce the distance between the user and the data centers, by making the server in the particular geographic location handle a request from that area. This way, it increases the performance and effectively utilizes the website's infrastructure to the maximum.

If a traffic in a particular area is high, then the load balancer again uses its balancing pool to balance the load among other servers. As your business grows, maintaining your site's performance becomes important and difficult. Using a load balancer can help you effectively optimize and improve your site's performance, making it handle popularity well.

To know more about load balancing, watch the video :