Shulou(Shulou.com)06/03 Report--

Content distribution network (Content Delivery Network, referred to as CDN) is a distributed network, which is established and covered on the bearer network, and is composed of server groups of edge nodes distributed in different areas. CDN shares the pressure on the origin server, avoids network congestion, ensures that the distribution of website content is accelerated in different regions and different scenarios, and improves the speed of resource access. Many users will encounter the problem of how to make effective use of CDN in the process of using CDN. Today, the editor gives you a brief introduction to the principle of CDN.

What is the principle of cdn? The main function of cdn is to reduce the access pressure for the origin server while providing faster content response for the client. In addition, CDN can also protect the origin server.

CDN network is to add a Cache layer between the user and the server. How to direct the user's request to the Cache to get the data of the source server is mainly realized by taking over DNS. When a user visits a website that joins the CDN service, the domain name resolution request will eventually be handed over to the global load balancer DNS for processing. The global load balancer DNS provides users with the node address closest to the user at that time through a set of pre-defined policies, so that users can get fast service.

At the same time, it also maintains communication with all CDNC nodes distributed around the world, collects the communication status of each node, ensures that user requests are not allocated to unavailable CDN nodes, and actually does global load balancing through DNS.

For the average Internet user, each CDN node is equivalent to a WEB placed around it. Through the control of the global load balancer DNS, the user's request is transparently directed to the nearest node, and the CDN server in the node will respond to the user's request just like the original server of the website. Because it is closer to the user, the response time must be faster.

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