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What is Round-Robin DNS?

Round Robin DNS is a technique of load distribution, load balancing, or fault-tolerance provisioning multiple, redundant Internet Protocol service hosts (e.g. Web server, FTP servers), by managing the Domain Name System's (DNS) responses to address requests from client computers according to an appropriate statistical model.

Round robin DNS is often used to load balance requests between a number of Web servers. For example, a company has one domain name and three identical copies of the same web site residing on three servers with three different IP addresses. When one user tries to access the home page it will be sent to the first IP address. The second user who tries to access the home page will be sent to the next IP address, and the third user will be sent to the third IP address. In each case, once the IP address is given out, it goes to the end of the list. The fourth user, therefore, will be sent to the first IP address.

Why do you need Round-Robin DNS?

These days, load balancing is essential for huge web services that generate a tremendous amount of traffic. As you can imagine, web servers can easily get overloaded. For that reason, Round-Robin is certainly a good approach for avoiding such incidents. It is a proper way and one of the most commonly used methods to split the traffic on your servers.

 Round Robin Example configuration:

Host Record Type Points to:
example.com A ip.of.first.server
example.com A ip.of.second.server
example.com A ip.of.third.server

 

Round Robin DNS

 

FAQ

Question: What hosting plan I need to use Round-Robin DNS?
Answer: Round-Robin DNS is included in the Free plan and all Paid plans. Sign up for free from here.

Question: Can I use ALIAS record in my Round-Robin DNS configuration?
Answer: Yes, you can use both A and ALIAS records in the Round-Robin DNS configuration

Question: Can I use AAAA record in my Round-Robin DNS configuration?
Answer: Yes, you can use AAAA records in the Round-Robin DNS configuration

Question: Can I use CNAME record in my Round-Robin DNS configuration?
Answer: No, CNAME records are not supported for Round-Robin DNS configuration and cannot be used in combination with any other DNS record for a same host.

Question: Does Round-Robin depend on my server's current state?
Answer: No, it does not. In order words, if one of your servers is down, Round-Robin will not exclude the unreachable server from your current DNS configuration.

Question: If I have 2 "A" records in Round-Robin, will this simply mean that I'm going to have a clean 50/50 split in my traffic?
Answer: Because of the resolvers cache and client-side cache as well, you cannot be absolutely sure for your traffic to be split equally.

Support of Round-Robin DNS

ClouDNS provides full support for Round-Robin for all our DNS services, including the listed below. Just write to our technical support, if you need any assistance with your Round-Robin configuration. Our Technical Support team is online for you 24/7 via live chat and tickets.


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