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  • Book Overview & Buying Learning Karaf Cellar
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Learning Karaf Cellar

Learning Karaf Cellar

By : Jean Baptiste Onofre, Jean-Baptiste Onofré
5 (1)
Buy this Book
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Learning Karaf Cellar

Learning Karaf Cellar

5 (1)
By: Jean Baptiste Onofre, Jean-Baptiste Onofré
Buy this Book

Overview of this book

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. 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.
Table of Contents (11 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Apache Karaf – Provisioning and Clusters
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1. Apache Karaf – Provisioning and Clusters
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What is OSGi?
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The OSGi container
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Multiple Apache Karaf containers
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Summary
2
2. Apache Karaf Cellar
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2. Apache Karaf Cellar
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Cluster topologies
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Apache Karaf Cellar architecture
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Apache Karaf Cellar installation and first commands
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Cluster resources
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Summary
3
3. Hazelcast
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3. Hazelcast
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What is Hazelcast?
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Distributed cluster resource states
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Replicas/Backup
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Networks
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Summary
4
4. Cluster Groups
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4. Cluster Groups
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Managing cluster groups
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Targeting provisioning
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Summary
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5. Producers, Consumers, Handlers, Listeners, and Synchronizers
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5. Producers, Consumers, Handlers, Listeners, and Synchronizers
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The event producer
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The event consumer
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Event handlers
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Listeners and synchronizers
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Summary
6
6. The Filtering of Cluster Events
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6. The Filtering of Cluster Events
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The configuration of the filters
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Resources
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Blacklist and whitelist
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Inbound and outbound
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Regex and event identification
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The default filter configuration
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Summary
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7. DOSGi
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7. DOSGi
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What is Cellar DOSGi?
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The API bundle
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The service bundle
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The client bundle
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Summary
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8. Cellar and Camel
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8. Cellar and Camel
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The communication between remote routes
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Caching with a distributed map
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Summary
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9. Roadmap
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9. Roadmap
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HTTP load balancing and session clustering
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Clustering a log service
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Summary
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Index
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Index

The configuration of the filters

The filtering of cluster events is defined in the etc/org.apache.karaf.cellar.groups.cfg configuration file. In this configuration file, you can find the filters with the following format:

cluster_group.[bundle|config|features].[whitelist|blacklist].[inbound|outbound]=regex

For instance, the following configuration blocks (blacklist) the incoming cluster events (inbound) that contain features named my-feature or other-* in the default cluster group:

default.features.blacklist.inbound=my-feature,other-*

Cellar provides a default filtering configuration for the default cluster group. This configuration is used as a template when you create a new cluster group. You can update the filters' configuration live by directly modifying the configuration on the node or using the config:* and cluster:config-* commands.

For instance, to add a new filter to a cluster group, you can run the following commands:

karaf@root> config:edit org.apache.karaf.cellar.groups
karaf@root...
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Learning Karaf Cellar
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