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Modern websites are dynamically generated by a server, which retrieves information from scripts in a programming language like PHP, Perl, or Python and creates a valid HTML document. The advantage of this approach lies in its high flexibility and the ability to tailor websites visually and in terms of content to individuals or groups. However, as the number of visitors and complexity increase, performance decreases, leading to slower page loading times. One solution to this problem is the Varnish Cache, which can be used with different web servers such as Apache 2 or NGINX.
The Varnish Cache is a reverse proxy that is placed in front of a server hosting websites and similar content. Upon the initial request, Apache 2 or NGINX processes the request as usual and delivers it. At the same time, the Varnish Cache stores a complete copy or parts of the dynamically generated webpage in memory. Upon subsequent requests, it retrieves this directly from memory, bypassing the web server. As there is no need for recalculation, the workload and response time are significantly reduced.
The application language ESI allows dynamic web pages to be broken down into individual components and assigned an individual cache lifetime. This way, the individual components can be assembled for different requests to avoid complex calculations. In an HTML document, so-called Element Tags mark the corresponding sections that are automatically inserted during the initial creation. Varnish Cache uses ESI to break down complex web pages into pieces and coordinate them. It then serves as a front-end cache where relevant data is stored.
Practically, Varnish Cache not only increases speed when loading a page, but also acts as a Load-Balancer for a high number of parallel accesses. It uses the Round Robin method, where tasks are placed in queues and then processed within limited time frames. Incoming requests and existing connections can be limited by Varnish Cache to tune the server's performance.
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Start tenderMost large companies use Varnish Cache to optimize their online presence and achieve low latency. Examples of these include Facebook, Twitter, eBay, or Wikipedia, as Varnish Cache provides specific benefits for websites with high traffic and visitor volume:
However, there are some significant disadvantages to consider before implementing it:
Varnish Cache can be installed on Linux VPS Hosting and Dedicated Servers if the user has administrative rights, but due to its complexity, it requires extensive expertise. Primarily suitable for medium to large enterprises due to its comparatively low benefits at low usage levels. For small businesses, simple and cost-effective measures such as optimizing the configuration of Apache 2 or NGINX are recommended before considering it as an integral part of web hosting.
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