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

After purchasing the CDN service, users will be more concerned about the actual effect in the process of using it. First of all, make sure that it has been activated successfully, and then follow the basic steps to add accelerated domain names and configure CNAME. After all, you can test whether the CDN acceleration is successful. Why CDN can accelerate.

Why can cdn accelerate? CDN acceleration stores website content on each node server, then parses the CNAME to the node control page through DNS, and automatically distinguishes the user's region and network through CDN control to select the nearest node server, so that what is displayed in front of the visitor is the cached content stored on the node server.

Cdn places node servers everywhere in the network to form an intelligent virtual network based on the existing Internet. The CDN system can real-time monitor the network traffic and the connection of each node, load status, distance to the user and response time and other comprehensive information to the user's request.

Implementation principle of CDN acceleration

The simplest CDN network consists of a DNS server and several caching servers:

1. When the user clicks on the content URL on the page of the website, after the local DNS system parses, the DNS system will finally hand over the resolution right of the domain name to the CDN dedicated DNS server pointed to by CNAME.

2.CDN 's DNS server returns the global load balancing device IP address of CDN to the user.

3. The user initiates a content URL access request to the global load balancer device of CDN.

The 4.CDN global load balancer device selects a regional load balancer device in the user's region based on the user's IP address and the content URL requested by the user, and tells the user to initiate a request to the device.

The regional load balancer equipment will select a suitable cache server to provide services for users. The selection basis includes: judging which server is closest to the user according to the user's IP address; judging which server has the content required by the user according to the content name in the URL requested by the user; and querying the current load of each server to determine which server still has service capacity.

After a comprehensive analysis based on the above conditions, the regional load balancer will return the IP address of a cache server to the global load balancer. The global load balancing device returns the IP address of the server to the user.

The user initiates a request to the cache server, and the cache server responds to the user's request and transmits the content needed by the user to the user terminal. If there is no content that the user wants on the cache server, and the zone balancing device still assigns it to the user, then the server will request the content from its higher-level cache server until the source server that traces back to the site pulls the content locally.

The above is an introduction to why cdn can speed up. The virtual host can enjoy Baidu's massive CDN node resources for free, rich node resources, covering the whole world, and providing acceleration services for a large number of users with unlimited traffic. Virtual host product link https://www.yisu.com/cloud/webhosting/

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