DNS Round Robin
DNS Round Robin is a load balancing technique that distributes incoming network traffic across multiple servers by returning multiple IP addresses in a rotating order for a single domain name. It works at the DNS level, where the DNS server responds to queries with a list of IP addresses that are cycled through for each request, providing a simple form of redundancy and scalability. This method does not monitor server health or load, relying instead on the rotation to spread traffic.
Developers should use DNS Round Robin when they need a straightforward, low-cost way to distribute traffic across multiple servers for basic load balancing or high availability, such as in web hosting, content delivery networks (CDNs), or microservices architectures. It is particularly useful for stateless applications where session persistence is not required, as it can help prevent single points of failure and improve response times by spreading requests. However, it should be combined with other techniques for more advanced scenarios, as it lacks health checks and can lead to uneven load distribution.