ActiveMQ

Apache ActiveMQ is an open-source message broker that enables communication between different applications using asynchronous messaging. It helps systems exchange data reliably using queues and topics, even when services are offline or distributed across different environments.

Features of Apache ActiveMQ:

• Supports asynchronous messaging between applications using queues and topics.
• Ensures reliable message delivery with persistence support.
• Supports multiple protocols such as JMS, AMQP, MQTT, STOMP, and OpenWire.
• Helps build scalable microservices and distributed systems.
• Provides a web-based management console for monitoring (default port 8161).
• Supports publish/subscribe and point-to-point messaging models.

ActiveMQ Usage:

$ sudo su
$ cd /opt/activemq/bin
$ Default login : $ cat /opt/activemq/bin/credentials.txt
$ /opt/activemq/bin/activemq stop
$ /opt/activemq/bin/activemq start
Now open in browser : http://YOUR-SERVER-IP:8161

Disclaimer: Apache ActiveMQ is an open-source project distributed under the Apache License 2.0. It is provided "as is" without any warranty. Proper security configuration is required before exposing it to production environments. Default credentials should be changed and firewall rules must be configured to prevent unauthorized access.