3.1.5. DNS record types

DNS records are records of the correspondence between a name and service information in the domain name system. Each record has a specific purpose and usage.

When specifying multiple similar records for a single subdomain, if the records cannot be used simultaneously (this refers to A, AAAA, ALIAS, CNAME records), a random record will be returned with each request. The system used to determine the randomness of the delivered record is RoundRobin. With such a system, it is possible to create minimal and simple load balancers with random load balancing results. It should be noted that for all records except MX, it is not possible to organize a scheme in which, if the server is unavailable for the first received record, the next record for the same domain/subdomain will be returned—this task can only be solved with a proxy server configured accordingly.