Roberto Moutinho - Instant Varnish Cache How-to
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Copyright 2013 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: January 2013
Production Reference: 1210113
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78216-040-3
www.packtpub.com
Author
Roberto Moutinho
Reviewer
Wilson Frana
Renata Moutinho
Acquisition Editor
Wilson D'souza
Commissioning Editor
Priyanka Shah
Technical Editors
Varun Pius Rodrigues
Sadhana Verma
Project Coordinator
Amigya Khurana
Proofreaders
Maria Gould
Lynda Sliwoski
Graphics
Aditi Gajjar
Production Coordinator
Prachali Bhiwandkar
Cover Work
Prachali Bhiwandkar
Cover Image
Sheetal Aute
Roberto Moutinho is a system analyst, DevOps evangelist, and a open source and open standards advocate currently residing in Rio de Janeiro, Brazil. Passionate about the Web, he's currently a web developer working in one of the largest classified platform in Latin America, optimizing overall performance of in-house and third-party services. When off duty, you'll often find him taking apart old electronics to salvage components for weird and often useless DIY projects.
The success of this project depends largely on the encouragement and guidelines of my sister Renata Moutinho. I can't thank her enough for her tremendous support and help. I'd also like to thank my family, especially my father Jose Jorge J. Moutinho and my mother Sonia M. Monteiro Moutinho, for their constant support and help, all my friends and coworkers for their ideas and feedback during the writing process of this book, and the guidance and support received from all members of Packt Publishing.
Wilson Frana is a software engineer with over a decade of experience in developing systems. He has worked in several different areas from billing systems for the first national mobile carrier in Brazil to real-time ticket systems for the largest beverage producer in the world, and lately he has been developing Rest APIs for the largest comparison shopping portal in Latin America. In his spare time, he is a training instructor for the Federal Technology Center (CEFET-RJ) and an Arduino enthusiast.
First, I would like to thank to Roberto Moutinho who gave me the opportunity to collaborate in this project. I would like to express my special gratitude to Packt Publishing for giving me such attention and time. My thanks and appreciation also go to my family and people who have helped me out with their abilities.
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Welcome to Instant Varnish Cache How-to .
Varnish Cache is an HTTP accelerator that stands between your customers and your application servers, acting as a front-end caching solution to your website. Varnish Cache is not a complete solution and will not serve your application content on its own; instead, it will proxy customers' requests to your web server and store their responses for later usage, avoiding an unnecessary (duplicated) workload.
Putting your website behind a Varnish Cache is quick and easy. In this book, you will learn how to make the most out of your infrastructure with minimal effort.
This book is the result of a year of collected information about scalability issues and caching in general, which led to the deployment of Varnish Cache on one of the major e-commerce/marketplace in Latin America.
Installing Varnish Cache (Must know) , introduces you to how to install Varnish Cache using its own official repository and make sure everything is set before we start configuring our Varnish daemon.
Varnish Cache server daemon options (Must know) , explains all the daemon options which make your Varnish Cache server act as expected, and adjust memory and CPU usage.
Connecting to backend servers (Should know) , defines from which backend servers Varnish will fetch the data and also create mechanisms to make sure that Varnish does not proxy a request to any offline backend.
Load balance requests (Should know) , explores all the possibilities of load balancing requests through application servers and creating a dedicated pool of servers to critical parts of your application system.
The Varnish Configuration Language (Should know) , will get you started on writing VCL code to manage all your caching policies and manipulate requests and responses.
Handling HTTP request vcl_recv (Should know) , explains how to choose backend servers according to what was requested by the client, block restricted content, and avoid cache lookup when it should not be performed.
Handling HTTP request vcl_hash (Should know) , explains how Varnish generates the hash used to store the objects in memory and how to customize it to save memory space.
Handling HTTP request vcl_pipe and vcl_pass (Should know) , introduces how to handle requests that should not be cached, making the data flow directly to the client.
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