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What is the specific introduction of DNS rotation? I believe many inexperienced people are at a loss about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

DNS Round Robin refers to the technology of randomly using one of the hosts by configuring DNS to make the same domain name interpret different IP. Through the DNS round-robin system, you can use N hosts as WEB servers, depending on the needs of your website. At present, more and more large-scale WEB services use DNS round robin to achieve load balancing, using multiple servers with the same role as foreground WEB services, which greatly facilitates service distribution planning and scalability, improves website access efficiency, and provides faster response time for customers who are anxiously waiting for a large number of data file request responses.

The DNS round-robin service can be applied to the following websites:

one。 The website is developing, but it has not reached the point of renting a server, or the funds for the site are not enough to pay for the rental of a separate server, so the site is still using shared virtual hosts. In the face of this situation, the virtual host setting of the same domain name on two IP addresses can be used to realize the alternate resolution of domain name access through DNS round robin, and the visit volume can be evenly distributed to the two virtual host servers where the website is located. This is a cheap and fast DNS round-robin scheme, which can help website users to achieve relatively basic distributed access services.

two。 The website already has an independent server, but due to the limitation of system management ability and time, the stability of the server running continuously is not high. In this case, if the user has more than two servers, it is easy to use DNS round robin to balance the load of multiple servers.

The advantage of DNS load balancing is that it is economical and easy, and the server can be located anywhere on the internet. But it also has many disadvantages:

1. In order to make this DNS server and other DNS servers interact in time, to ensure that the DNS data is updated in time, and to assign addresses randomly, it is generally necessary to set the refresh time of DNS to be small, but too small will cause additional network problems due to the increase of DNS traffic. two。 Once a server fails, even if the DNS settings are modified in time, you still have to wait enough time (refresh time) to work, during which time, the client computer that saved the failed server address will not be able to access the server properly.

3. DNS load balancer uses a simple round robin load algorithm, which can not distinguish the differences between servers, cannot reflect the current running status of servers, can not allocate more requests for servers with better performance, and may even concentrate customer requests on a server.

4. To assign each server an IP address on internet, it is bound to take up too many IP addresses

After reading the above, have you mastered the specific introduction of DNS round robin? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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