Round Robin DNS
Round Robin DNS is a load balancing technique that distributes incoming network traffic across multiple servers by returning different IP addresses in a rotating sequence for each DNS query. It works by configuring a DNS server to have multiple A or AAAA records for a single domain name, each pointing to a different server, and cycling through them in order for each resolution request. This provides a simple, DNS-level method to spread client requests and improve availability without requiring specialized hardware or complex software.
Developers should learn and use Round Robin DNS when they need a basic, cost-effective way to distribute traffic across multiple web servers, application servers, or other services to handle increased load or provide redundancy. It is particularly useful for small to medium-scale deployments where simplicity and minimal overhead are priorities, such as in web hosting, content delivery, or failover scenarios, though it lacks advanced features like health checks or session persistence found in dedicated load balancers.