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- Herausgeber: Packt Publishing
- Kategorie: Fachliteratur
- Sprache: Englisch
High availability is a system design approach and associated service implementation which ensures that a prearranged level of operational performance will be met during a contractual measurement period. High availability is usually a system combined with many different components that achieve different goals. High availability cluster implementations attempt to build redundancy into a cluster to eliminate single points of failure.
JBoss EAP6 High Availability is the perfect guide for learning how to apply the newest technologies provided by JBoss to build your high availability system. With a clear explanation of the design of JBoss EAP6 and its clustering components, this book will help you customize each component to fulfill your specific requirements.
Throughout the course of this book, you will learn how to build high availability clusters using the projects provided by JBoss. The book begins with an introduction to the design of JBoss EAP6 and its uses. The next step will be to explore the two companion open source projects - mod_jk and mod_cluster. In this section, you will get to grips with the concept of load balancing with mod_jk and mod_cluster. You will also learn how to enable SSL in the clustering environment and how to configure session replication between EAP6 servers. Furthermore, the appendix section introduces you to some troubleshooting techniques for Wildfly.
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Seitenzahl: 150
Veröffentlichungsjahr: 2013
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Table of Contents
JBoss EAP6 High Availability
JBoss EAP6 High Availability
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: December 2013
Production Reference: 1171213
Published by Packt Publishing Ltd.
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ISBN 978-1-78328-243-2
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Cover Image by Aniket Sawant (<[email protected]>)
Credits
Author
Weinan Li
Reviewers
Dustin Kut Moy Cheung
Jean-Frederic Clere
Ty Lim
Martin Večeřa
Acquisition Editors
Owen Roberts
Erol Staveley
Commissioning Editor
Sruthi Kutty
Technical Editors
Pooja Nair
Humera Shaikh
Ritika Singh
Nachiket Vartak
Copy Editors
Alisha Aranha
Roshni Banerjee
Sarang Chari
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Kirti Pai
Project Coordinator
Ankita Goenka
Proofreader
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Indexer
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Graphics
Sheetal Aute
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Valentina Dsilva
Production Coordinator
Shantanu Zagade
Cover Work
Shantanu Zagade
About the Author
Weinan Li started off as a Metro Railway Engineer and has worked at Alcatel since 2004 playing with hardware and assembly language.
He entered Red Hat in 2011 and is currently working as a Senior Software Engineer in the JBoss EAP team. He is also the productization leader of JBoss EWS and an active contributor to RESTEasy.
He currently lives in Beijing with his wife and their three-year-old son.
I would like to thank Veena Manjrekar from Packt Publishing who recommended me to write this book. I also give my gratitude to the editors from Packt Publishing, Sruthi Kutty and Ankita Goenka, who have given me great support during the writing process of this book.
I would like to thank my colleagues from Red Hat who have patiently answered my questions and helped me to review this book. They are Dustin Kut Moy Cheung, Fernando Nasser, Jean-Frederic Clere, Michal Babacek, Mladen Turk, Paul Ferraro, and Radoslav Husar. I would like to thank Martin Večeřa and Ty Lim who have given me a lot of advice.
I would like to especially thank Jean-Frederic Clere who has given me a lot of guidance during the writing process of this book. I would also like to thank all the people from the JBoss community who have inspired me to write this book.
Finally, thank you to my parents, my wife, and my son. I love you.
About the Reviewers
Dustin Kut Moy Cheung was born and raised in the island of Mauritius. Dustin's interest in computers was sparked when he obtained his first computer at the age of nine. Since then, he became determined to head into a career in the software world. He values spending time with his close friends, and looks at pictures of puppies and kittens in his spare time.
I'd like to thank Weinan for giving me the opportunity to review this book. I'd also like to thank the awesome people at Red Hat, Toronto; you guys rock! To my friends scattered around the world, I miss you! And of course, I wouldn't be here without the unconditional love and dedication of my parents. Thank you Papi and Mami!
Jean-Frederic Clere was born in France, where he studied. After a few years of consulting work there, he started to write servers for applications and moved to Barcelona, Spain. In 2000, he started contributing to Apache Software Foundation projects. Since 2006 he has been working for Red Hat in the JBoss division where he takes care of the web layer and the Apache httpd as a proxy for the Application Server. Actually, he lives in Neuchatel, Switzerland.
I would like to thank my wife Adelina for her patience with my geek behavior and all the colleagues and friends from Open Source communities who make my contributions possible.
Ty Lim is an experienced IT professional with more than 15 years' experience working on various operating system and middleware platforms. He has professional experience with IBM WebSphere Application Server, Apache Tomcat, Apache httpd server, and various other middleware and operating system platforms. He has experience working in various industries that include healthcare, telecommunications, financial, and software development. He holds a Bachelor of Science in Computer Science from the University of the Pacific, and a Master of Science degree in Computer Information Systems from Boston University.
I would like to thank my friends and family for their continued support.
To my "HH" friends, let's always keep the party going.
Martin Večeřa is a JBoss Quality Assurance Manager within a division of Red Hat. He has a passion for bleeding-edge projects and technologies. His main area of interest is Java middleware and performance testing in which he has almost 10 years' experience. Previously, he has developed information systems for power plants and medical companies. He publishes articles on Java middleware to various international and local web magazines and is a co-author of a blog on the PerfCake Performance Testing Framework.
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Preface
High availability is a broad topic to discuss, and it concerns both project deployment and development. In this book, I'd like to explore the topics on clustering, load balancing, failover, and session replication.
High availability is also a very interesting topic, and the technologies provided by open source communities are especially fun. In this book we'll learn how to use JBoss EAP6 together with other JBoss and Apache community tools to build a high-availability system.
Here is a brief list of the projects we'll use in this book: JBoss EAP 6, Apache httpd, mod_jk, and mod_cluster. When I'm writing this book, JBoss EAP 6.1.0.Final is the newest product version based on JBoss AS 7.2.x and can be downloaded freely from the JBoss community. This version is very stable with its clustering features, so we'll use it in our book.
Since AS 8.x, the project name of JBoss AS has been renamed to WildFly. Though the project name changed, its design hasn't changed much, and you can reuse most of the knowledge in this book for future versions of WildFly.
JBoss EAP6 has provided a domain management feature that can help us to centralize the management of many servers. This feature is very helpful in a clustering environment, because we don't have to manage each server separately. We'll check this feature in the book.
Transportation security is usually considered critical in business applications. In this book, I'll introduce the methods of applying SSL into a clustering environment.
What this book covers
Chapter 1, JBoss EAP6 Overview, teaches you how to download and install JBoss EAP6, introduces you to startup modes of JBoss EAP6, and covers the basic uses of the domain management function.
Chapter 2, Using JBoss EAP6, covers more details on using the EAP6 management console and explains the design of the EAP6 management model.
Chapter 3, Setting Up a JBoss EAP6 Cluster, guides you on how to set the EAP6 servers properly for it to form a cluster.
Chapter 4, Load Balancing with mod_jk, shows how to use mod_jk as the load balancer of the EAP6 cluster.
Chapter 5, Load Balancing with mod_cluster, discusses how to use mod_cluster as the load balancer of the EAP6 cluster.
Chapter 6, Clustering with SSL, shows how to enable SSL in a clustering environment and teaches you how to set SSL to work with mod_jk.
Chapter 7, Configuring mod_cluster with SSL, shows how to set SSL to work with mod_cluster.
Chapter 8, Developing Distributed Applications, discusses how to develop the distributable applications with the help of JavaEE technologies and deploy it into the EAP6 cluster.
Appendix, WildFly Troubleshooting, shows how to debug the WildFly server at runtime. This chapter is available as a bonus chapter and can be downloaded from http://www.packtpub.com/sites/default/files/downloads/2432OS_Appendix.pdf.
What you need for this book
Some basic knowledge on Linux/Unix is required to read this book. You may need to follow the shell commands shown in the book to configure the servers properly.
Some basic understanding of IP multicasting is strongly recommended. Because many clustering features rely on IP multicasting, you can better understand the design of EAP6 clustering with this knowledge.
If you want to follow the instructions in Chapter 8, Developing Distributed Applications, you may need some basic knowledge of EJB and Servlet development. In addition, some knowledge on Maven usage is preferred.
Chapter 6, Clustering with SSL, and Chapter 7, Configuring mod_cluster with SSL, mainly focus on applying SSL in clustering. Some basic understanding of SSL/TLS technologies is needed if you want to follow the instructions in these two chapters.
When you are following the instructions in this book, please turn off the network firewall of your machine in case it blocks important ports needed by the cluster. If you are using Linux as your working environment, please disable SELinux because it will affect a lot on the clustering features. When you have fully understood the EAP6 clustering features, you can turn these protections back online and configure them properly to work with the EAP6 cluster.
Who this book is for
JBoss EAP6 administrators and JavaEE developers are the main audience of this book. Anyone who wants to know the coolest technologies provided by the JBoss community is recommended to read this book. I hope this book is not merely a step-by-step tutorial, so I've included some discussions on the design of JBoss EAP6 and relative projects.
Conventions
In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text, folder names, filenames, file extensions, pathnames, dummy URLs, and user input are shown as follows: "The default configuration file is standalone.xml."
A block of code is set as follows:
Any command-line input or output is written as follows:
New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "To undeploy the project, click on En/Disable first and then click on Remove".
Note
Warnings or important notes appear in a box like this.
Tip
Tips and tricks appear like this.
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