By Dinesh C. Verma
Content material distribution networks (CDNs) are the main promising new innovations for dealing with the large and quickly turning out to be quantity of web site visitors. In essence, CDNs are teams of proxy-servers situated at strategic issues round the web and organized so one can make sure that a obtain request can constantly be dealt with from the closest server. during this, the 1st reference within the box, a famous CDN pioneer describes some of the applied sciences concerned and explains how they got here jointly to shape a operating process. With assistance from case reports, he covers all of the useful fundamentals and gives priceless implementation schemes.
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Extra resources for Content Distribution Networks: An Engineering Approach
Com. The real web servers, A, B, and C, are assigned other IP addresses available to the company. 2. 129 as its well-known external IP address. 129. company. 2. 4 respectively. 1. The IP addresses are shown for ease in discussion, and other sets of IP address may be used with the same results. The mapping between the domain names of the IP address of the individual web servers, A, B, and C, may be advertised to the public domain name system, or the organization may choose to keep the mapping private.
It must be kept in mind that running the server side of an application on multiple machines in parallel is difficult to do for all applications in general. However, a large class of server applications can be executed in parallel relatively easily. 2 SCALABLE SITE ARCHITECTURE 29 chines without a lot of work. A common instance of a stateless application is a read-only application, one that simply provides readonly access to some data, performing transformations like putting the data into a format comprehensible to the client.
Some of the sites used as surrogate sites or origin sites may consist only of a single machine. In this case, the machine must be chosen to be fast enough to meet the number of users that are expected at the site. However, in many instances, the total number of users can exceed the amount that can be handled by the fastest available machine without a noticeable degradation in performance. In this case, multiple machines are needed to service these requests. In this chapter, we look at the different techniques that can be employed to use more than one machine to develop a more scalable site.
Content Distribution Networks: An Engineering Approach by Dinesh C. Verma