ActiveMQ introduction

Official website description

Apache ActiveMQ ™ is the most popular and powerful open source messaging and Integration Patterns server.

Apache ActiveMQ is fast, supports many Cross Language Clients and Protocols, comes with easy to use Enterprise Integration Patterns and many advanced features while fully supporting JMS 1.1 and J2EE 1.4. Apache ActiveMQ is released under the Apache 2.0 License.

Grab yourself a Download, try our Getting Started Guide, surf our FAQ or start Contributing and join us on our Discussion Forums. Taken from Apache ActiveMQ official website

Overview

JMS is Java's message service and an important specification in J2EE. JMS clients can use JMS service for asynchronous message transmission.

ActiveMQ implements JMS in Java

ActiveMQ 5.15.3 installation

• Download ActiveMQ 5.15.3

download link:http://activemq.apache.org/activemq-5153-release.html
FTP tool upload to Linux designated directory

• Unzip and view ActiveMQ 5.15.3 directory structure

[root@localhost apache-activemq-5.15.3]# tar zxvf apache-activemq-5.15.3-bin.tar.gz

[root@localhost apache-activemq-5.15.3]# pwd
/usr/local/software/apache-activemq-5.15.3
[root@localhost apache-activemq-5.15.3]# ll
total 17740
-rwxr-xr-x. 1 root root 18104253 Jan 29 05:52 activemq-all-5.15.3.jar
drwxr-xr-x. 5 root root     4096 May  8 00:22 bin
drwxr-xr-x. 2 root root     4096 May  8 00:22 conf
drwxr-xr-x. 2 root root       25 May  8 00:22 data
drwxr-xr-x. 2 root root       73 May  8 00:22 docs
drwxr-xr-x. 7 root root       66 Jan 29 05:53 examples
drwxr-xr-x. 6 root root     4096 May  8 00:22 lib
-rw-r--r--. 1 root root    40580 Jan 29 05:53 LICENSE
-rw-r--r--. 1 root root     3334 Jan 29 05:53 NOTICE
-rw-r--r--. 1 root root     2610 Jan 29 05:53 README.txt
drwxr-xr-x. 6 root root       89 May  8 00:22 webapps
drwxr-xr-x. 3 root root       17 May  8 00:22 webapps-demo

• Start and stop

[root@localhost bin]# ./activemq start

[root@localhost bin]# ./activemq stop

• Check if the startup is successful

Here is a brief description of the ActiveMQ port, 61616 is the message broker interface, and 8161 is the management interface.
activemq default port 61616

root@localhost ~]# netstat -anp|grep 61616
tcp6       0      0 :::61616                :::*                    LISTEN      6264/java           
[root@localhost ~]# lsof -i:61616
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
java    6264 root  130u  IPv6  62853      0t0  TCP *:61616 (LISTEN)

• WEB management page

URL: http://127.0.0.1:8161/admin/
The default account password is admin

ActiveMQ 5.15.3 analysis

Files in the conf directory

/usr/local/software/apache-activemq-5.15.3/conf

[root@localhost conf]# pwd
/usr/local/software/apache-activemq-5.15.3/conf
[root@localhost conf]# ll
total 80
-rw-r--r--. 1 root root 5911 Jan 29 05:53 activemq.xml
-rw-r--r--. 1 root root 1370 Jan 29 05:48 broker.ks
-rw-r--r--. 1 root root  592 Jan 29 05:48 broker-localhost.cert
-rw-r--r--. 1 root root  665 Jan 29 05:48 broker.ts
-rw-r--r--. 1 root root 1357 Jan 29 05:48 client.ks
-rw-r--r--. 1 root root  665 Jan 29 05:48 client.ts
-rw-r--r--. 1 root root 1172 Jan 29 05:53 credentials-enc.properties
-rw-r--r--. 1 root root 1121 Jan 29 05:53 credentials.properties
-rw-r--r--. 1 root root  962 Jan 29 05:53 groups.properties
-rw-r--r--. 1 root root 1011 Jan 29 05:53 java.security
-rw-r--r--. 1 root root 1087 Jan 29 05:53 jetty-realm.properties
-rw-r--r--. 1 root root 7795 Jan 29 05:53 jetty.xml
-rw-r--r--. 1 root root  965 Jan 29 05:53 jmx.access
-rw-r--r--. 1 root root  964 Jan 29 05:53 jmx.password
-rw-r--r--. 1 root root 3071 Jan 29 05:53 log4j.properties
-rw-r--r--. 1 root root 1207 Jan 29 05:53 logging.properties
-rw-r--r--. 1 root root 1016 Jan 29 05:53 login.config
-rw-r--r--. 1 root root  961 Jan 29 05:53 users.properties

• View users.properties

vi users.properties

## Omit comments, only one line

admin=admin

• View groups.properties

vi groups.properties

## Omit comments, only one line

admins=admin

Files in the data directory

/usr/local/software/apache-activemq-5.15.3/data

[root@localhost data]# pwd
/usr/local/software/apache-activemq-5.15.3/data
[root@localhost data]# ll
total 32
-rw-r--r--. 1 root root 21949 May  9 01:58 activemq.log
-rw-r--r--. 1 root root     5 May  9 01:58 activemq.pid
-rw-r--r--. 1 root root     5 May  9 01:09 activemq.pid.stop
-rw-r--r--. 1 root root     0 May  8 00:34 audit.log
drwxr-xr-x. 2 root root    60 May  8 00:34 kahadb
[root@localhost data]# 

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View documents:
1. linux install Apache ActiveMQ 5.15.3