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

Compared with other CDN service providers, the main advantages of CDN include stable and fast, cost-effective, easy to use, efficient and intelligent. More users will ask about the advantage of stability and speed. Generally speaking, CDN is characterized by sharing the pressure on the origin server, avoiding network congestion, accelerating the distribution of website content in different regions and different scenarios, and improving the speed of resource access. The following is to introduce the principle and operation method of CDN acceleration service.

How to do cdn acceleration? The main technical means to achieve CDN acceleration are cache and mirror server. Can work in DNS parsing or HTTP redirection two ways, through the Cache server, or remote mirror site to complete the transmission of content and synchronous update.

The accuracy of location judgment of users in DNS method is more than 85%. The accuracy of HTTP method is more than 99%.

In general, the ratio of the amount of data flowing in by users of each Cache server farm to the amount of data that the Cache server fetches content from the original website is between 2:1 and 3:1, that is, it shares 50 to 70 percent of the amount of data repeatedly visited to the original website (mainly pictures, streaming media files, etc.); for mirrors, except for data synchronization traffic, the rest is completed locally and does not access the original server.

Mirror site servers are often seen, which allow content to be distributed directly and are suitable for static and quasi-dynamic data synchronization. However, the cost of purchasing and maintaining the new server is high. in addition, mirror servers must be set up in various regions and equipped with professional and technical personnel for management and maintenance.

While large websites update local servers at any time, the demand for bandwidth will also increase significantly, therefore, the average Internet company will not build too many mirror servers.

Caching is low-cost and suitable for static content. Internet statistics show that more than 80% of users often visit 20% of the website's content. Under this rule, the cache server can handle most customers' static requests, while the original WWW server only needs to handle about 20% of non-cache requests and dynamic requests, thus greatly speeding up the response time of customer requests and reducing the load of the original WWW server.

The above is about how to do cdn acceleration.

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