Learning Karaf Cellar

Jean-Baptiste Onofre

• Éditeur: Packt Publishing
• Année: 2014
• ISBN:
  9781783984602
• Édition: 1
• Sujet: Informatica
• Sous-sujet: Sviluppo di applicazioni

In Detail

Apache Karaf is a popular OSGi container that provides rich and broad features, and together with Cellar, you can easily manage farms of containers that provide synchronization between the instances of Karaf. In a real production system, users require a farm of containers to implement failover and scalability, as well as the tools required to provision the different members of a cluster. This book will help you understand the architecture, installation, and configuration of a cluster and teach you about different components and features to get the best out of a clustering solution using Apache Karaf Cellar.

Learning Karaf Cellarstarts with an introduction to some of the key features of Karaf. After a quick but detailed understanding of OSGi and Karaf, this book takes you through the concept of provisioning clusters and then covers what Cellar is and how to use it.

Approach

This book is a tutorial written with a step-by-step approach to help you implement an optimum clustering solution in Apache Karaf Cellar quickly and efficiently.

Who this book is for

If you are new to Karaf and want to install and manage multiple Karaf instances by farming or clustering, then this book is for you. If you are a Java developer or a system administrator with basic knowledge of Karaf, you can use this book as a guide. Some background knowledge of OSGi and/or Karaf would be preferred but is not mandatory.

Learning Karaf Cellar

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Table of Contents

Learning Karaf Cellar

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Apache Karaf – Provisioning and Clusters

What is OSGi?

The OSGi framework

The OSGi bundle

Dependency between bundles

The OSGi container

Provisioning in Apache Karaf

OBR

Apache Karaf Features

Multiple Apache Karaf containers

Provisioning clusters

Summary

2. Apache Karaf Cellar

Cluster topologies

Apache Karaf Cellar architecture

Apache Karaf Cellar installation and first commands

Cluster resources

Bundles

Karaf features

Configuration

Optional resources

The Karaf WebConsole plugin

Summary

3. Hazelcast

What is Hazelcast?

Distributed cluster resource states

Distributed queues and topics

The Cellar distributed map

Replicas/Backup

Persistence

Networks

Multiple clusters

TCP/IP

Interfaces

SSL

Encryption

IPv6 support

Restricting outbound ports

Summary

4. Cluster Groups

Managing cluster groups

Targeting provisioning

Features

Bundles

Configurations

Optional resources

Overlapping

The summary of commands

Summary

5. Producers, Consumers, Handlers, Listeners, and Synchronizers

The event producer

The event consumer

Event handlers

Listeners and synchronizers

Summary

6. The Filtering of Cluster Events

The configuration of the filters

Resources

Blacklist and whitelist

Inbound and outbound

Regex and event identification

Bundle

Configuration

Features

The default filter configuration

Summary

7. DOSGi

What is Cellar DOSGi?

The API bundle

The service bundle

The client bundle

Summary

8. Cellar and Camel

The communication between remote routes

Caching with a distributed map

Summary

9. Roadmap

HTTP load balancing and session clustering

Load balancing

Session clustering

Clustering a log service

Summary

Index

Learning Karaf Cellar

Copyright © 2014 Packt Publishing

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First published: July 2014

Production reference: 1150714

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78398-460-2

www.packtpub.com

Cover image by Abhinav Pandey (<[email protected]>)

Credits

Author

Jean-Baptiste Onofré

Reviewers

Ladislav Gažo

Sachin Handiekar

Achim Nierbeck

Commissioning Editor

Usha Iyer

Acquisition Editor

Meeta Rajani

Content Development Editor

Susmita Panda Sabat

Technical Editors

Mrunal Chavan

Ankita Jha

Pankaj Kadam

Copy Editors

Alisha Aranha

Roshni Banerjee

Dipti Kapadia

Aditya Nair

Karuna Narayanan

Project Coordinator

Neha Thakur

Proofreaders

Simran Bhogal

Ameesha Green

Paul Hindle

Indexers

Hemangini Bari

Tejal Soni

Graphics

Ronak Dhruv

Valentina D'silva

Production Coordinator

Nilesh R. Mohite

Cover Work

Nilesh R. Mohite

About the Author

Jean-Baptiste Onofré is a member of the Apache Software Foundation, and he has been involved in Apache projects for the past 10 years. He is the PMC chair of Apache Karaf and its subprojects, including Cellar, Cave, and EIK.

He is also a PMC member of Apache ACE, Apache ServiceMix, and Apache Syncope, and he is a committer for Apache ActiveMQ, Apache Archiva, Apache Aries, Apache Camel, and Apache jClouds.

He is currently working for Talend (http://www.talend.com) as a software architect and is a member of the Talend Apache team.

He writes articles on Java technologies for Linux Magazine France and has worked as a reviewer for Apache ServiceMix How-To, Henryk Konsek, and Learning Apache Karaf, Johan Edstrom, Jamie Goodyear, and Heath Kesler. Both of these books are published by Packt Publishing. He is currently reviewing Apache Karaf Cookbook, Johan Edstrom, Jamie Goodyear, Heath Kesler, and Achim Nierbeck, Packt Publishing.

He has also given speeches about Apache projects (Karaf, Camel, and so on) at different conferences, especially at ApacheCon NA, ApacheCon Europe, and CamelOne.

I would like to thank the whole Karaf team, especially Guillaume Nodet, Achim Nierbeck, Jamie Goodyear, Ioannis Canellos, and all others. We are a great team, and you all do a great job.

I would also like to thank my wife, Lucile, who accepted that I spent some nights on this book.

About the Reviewers

Ladislav Gažo is a computer enthusiast who has been digging into the software world for a long time. He has professional experience of more than 12 years in development and software engineering. While starting experiments with computer graphics and network administration, he realized that the true path is towards the combination of ...