Varnish Once it comes to website performance, Varnish is a hot tech. With simple installation and configuration, it is possible to increase the performance of any website and serve up to a million pages with just a small virtual private server., I will show you four possible configurations to help you improve your site’s response time, whether you’re serving hundreds, thousands, or millions of pages.

Introduction To Varnish


Varnish-Cache is a web accelerator whose purpose is to cache a website’s content. It is an open-source project that aims to optimize and speed up website access in a non-invasive way – without changing the code – and allows you to get your hands on your website.

The creators of Varnish Cache called it a web accelerator because its primary purpose is to improve and speed up the front end of a website. Varnish achieves this by storing copies of the pages served by the web server in its cache. The next time the same page is invited, Varnish will do the document instead of asking for the page from the web server, which will significantly improve performance.

The Key Features Of Varnish Cache’s Performance

Another of the key features of Varnish Cache’s performance is the flexibility of its configuration language, VCL. The VCL allows policies on how Should handle incoming requests. In such a strategy, you can decide what content you want to deliver, where to get the content, and how to modify the request or response.

In the following configuration examples, I’ll show you the VCL rules to achieve specific goals, from simply caching images and static objects to using Varnish in a distributed environment or having it act as a load balancer.

All of the following instances are for Varnish 3. x. Just so you know, Varnish 2. x uses different syntax and rules, so these examples are incompatible with this version.

Now The Central States Of Varnish

  • Recv. Is the first function called when receiving a request? Here we can manipulate the request before checking its presence in the cache. In stock, the central server to which the proposal will send can choose this stage.
  • Pass. We can use this purpose when we want to pass the request to the web server and cache the response.
  • pipeline. This purpose avoids Varnish and directs the request to the web server.
  • Search. Varnish asks to check if the response is present and valid in the cache with a search.
  • fetch. This function is called after fetching content from the backend is invoked to bypass or miss

The Standard: Cached Images And Pages Varnish

Usually, you don’t just want to cache static content on your website. Still, you also want to cache some dynamic pages generated by your web server but are the same for all users or your anonymous users. In this phase, you must know how to select which sheets can be secreted then which can

WordPress is a decent example, one of the most ordinarily castoff content management systems. WordPress makes website pages dynamically with PHP and queries a MySQL database. It’s good because you can easily update your website from the admin interface with just a few connections, but it’s also expensive in terms of funds used. Why track the same PHP script and MySQL inquiry every time an operator lands on the homepage? We can use it to cache the most fantastic visited pages and get excellent results.

Advanced Usage: Building A Resilient Web Server In A Distributed Environment Varnish

It is our final configuration file with all the options we’ve seen so far and defining two backends with a particular directive for the probe how it determines if a web server is alive or not.

A Powerful Tool Varnish

These are just bad examples that can help you use it . This tool is potent and  can help you improve your performance without buying more hardware or virtual machines. For many website administrators, this is a real advantage.