In this article, we will use a Python-based messaging client to connect and subscribe to a topic with a durable subscription in the Apache ActiveMQ Artemis broker. We will use the text-based STOMP protocol to connect and subscribe to the broker. STOMP clients can communicate with any STOMP message broker to provide messaging interoperability among many languages, platforms, and brokers.
If you need to brush up on the difference between persistence and durability in messaging, check Mary Cochran’s article on developers.redhat.com/blog.
A similar process can be used with Red Hat AMQ 7. The broker in Red Hat AMQ 7 is based on the Apache ActiveMQ Artemis project. See the overview on developers.redhat.com for more information.
Continue reading “Using the STOMP Protocol with Apache ActiveMQ Artemis Broker”
In this post, I wanted to address how to configure mKahaDB persistence storage on ActiveMQ for better management and reducing disk usage.
Default configured KahaDB persistence adapter works well when all the destinations (queues/topics) being managed by the broker have similar performance. However, an enterprise solution where several third parties are involved is never the case.
There are multiple queues or topics and different consumers or listeners listening to these queues/topics. Some consumers might be slower than other consumers. This will grow the message store’s disk usage rapidly. Due to this situation and being single KahaDB all store destinations might perform slow.
Continue reading “Configuring mKahaDB persistence storage for ActiveMQ”
This article will help in setting up JDBC Master/Slave for embedded Activemq in Red Hat JBoss Fuse/AMQ 6.3 with postgresql db from scratch.
Continue reading “JDBC Master-Slave Persistence setup with Activemq using Postgresql database.”
As I tried to create queues/topics installed within OpenShift 3.2 and accessible to external clients, I found that there were more things assumed about the process than not. So I decided to share my steps with others.
The only supported template for this scenario is via ssl transport with persistence
- That OpenShift is installed and working
- Persistent volumes have been created in OpenShift to use
- You must have a persistent store (i.e. a PV must be set up) based upon the template we are using.
- The volume claim is made during the build. It must be smaller than the size of the PV
At JUDCon 2013 in Boston, Scott Cranton and I presented a talk entitled Resilient Enterprise Messaging with Fuse & Red Hat Enterprise Linux. This technical article is the follow up work from that presentation.
JBoss A-MQ is built on ActiveMQ which is a robust messaging platform that supports STOMP, JMS, AMQP and modern principals in Message Oriented Middleware (MOM). It’s built from the ground up to be loosely coupled and asynchronous in nature. This provides ActiveMQ with native high availability capabilities. An administrator can easily configure an ActiveMQ master/slave architecture with a shared filesystem. In the future this will be augmented with Replicated LevelDB.
Red Hat Enterprise Linux is the popular, stable and scalable Linux distribution which has High Availability and Resilient Storage add-on support built on CMAN, RGManager, Corosync, and GFS2. High Availability and Resilient Storage expand upon the high availability capabilities built into ActiveMQ and provide a robust, and complete solution for enterprise deployments that require deeper clustering capabilities.
There are two main architectures commonly used to provide fault tolerance to a messaging server. The first is master/slave which is easy to configure, but as it scales, it requires 2X resources. The second is made up of active nodes and redundant nodes. The redundant nodes can take over for any one of the active nodes should they scale. The active/redundant architecture requires more software and more initial configuration, but uses N+1 or N+2 resources as it scales.
This article will explore the technical requirements and best practices for building and designing a N+1 architecture using JBoss A-MQ, Red Hat Enterprise Linux, the High Availability Add-On and the Resilient Storage Add-On.
Continue reading “Resilient Enterprise Messaging with JBoss A-MQ & Red Hat Enterprise Linux”