DNS load balancing uses a technique of distributing incoming network traffic across multiple servers to spread the workload and ensure high availability and reliability. Here are the steps involved in the working of DNS load balancers:
1. Client requests server IP address: A client sends a request to the DNS resolver for the IP address of the website or application they want to access.
1. DNS resolver contacts the load balancer: If the IP address is not cached, the resolver contacts the load balancer instead of the web server directly.
1. Load balancer selects a server: The load balancer uses a predefined algorithm to choose the best available server from the pool of servers based on factors such as availability, server load, and location.
1. Load balancer returns IP address: The IP address of the selected server is then returned to the DNS resolver, which in turn sends it back to the client.
1. Client connects to the server: The client uses the returned IP address to connect to the selected server and access the associated website or application.
1. Server responds to the request: The server processes the request and returns the requested content to the client.
1. Load balancer monitors the servers: The load balancer continually monitors each server’s health and performance to maintain the most efficient server selection.
Overall, DNS load balancing is an effective way to improve website or application performance by efficiently distributing the workload among multiple servers, improving speed, reliability, and scalability.
