Running multiple ActiveMQ instances on one machine

19 Jan

A few weeks ago I started making use of Apache ActiveMQ again as the JMS provider with my Mule ESB solution. Since it had been a few years that I used ActiveMQ I thought it would be nice to check out some of the (new) features like the failover transport and other clustering features. To be able to test these last things I needed multiple installations of ActiveMQ on my machine. Luckily this isn’t very hard to accomplish, although the documentation on this on the ActiveMQ site is quite minimal.
Apache-activemq-logo
The first step is to download and unzip the ActiveMQ package, which I did at ~/develop/apache-activemq-5.8.0.

To create the instances I go to the activeMQ home directory and use the ‘create’ command like this:

cd develop/apache-activemq-5.8.0/
./bin/activemq create instanceA
./bin/activemq create instanceB

Now if you do a ‘ls -l’ you will see that there are two subdirectories created, ‘instanceA’ and ‘instanceB’. Since both instances will make use of the default ports we have to modify the config for the second instance. Go to the directory ‘develop/apache-activemq-5.8.0/instanceB/conf’ and open the file ‘jetty.xml’ to make the webconsole available at port ‘8162’ by modifying the following line:

<bean id="Connector" class="org.eclipse.jetty.server.nio.SelectChannelConnector">
  <property name="port" value="8162" />
</bean>

Next open the file ‘activemq.xml’ in the same directory and modify the following part:

<transportConnectors>
  <!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
  <transportConnector name="openwire" uri="tcp://0.0.0.0:61617?maximumConnections=1000&amp;wireformat.maxFrameSize=104857600"/>
  <transportConnector name="amqp" uri="amqp://0.0.0.0:5673?maximumConnections=1000&amp;wireformat.maxFrameSize=104857600"/>
 </transportConnectors>

That’s it! Make sure both files are saved and start the first instance with:
cd ~/develop/apache-activemq-5.8.0/instanceA/bin
./instanceA console

Open up a new console and run the commands:
cd /Users/pascal/develop/apache-activemq-5.8.0/instanceB/bin
./instanceB console

Screenshot 2014-01-18 08.52.39
Now you have two instances running next to each other and can start testing the ‘advanced’ functions of ActiveMQ.

7 Responses to “Running multiple ActiveMQ instances on one machine”

  1. suja 07/03/2014 at 06:51 #

    I wasn’t able to create 2 seperate instance on same machine on comparing my log with yours i found that below values differ

    ACTIVEMQ_HOME: C:\apache-activemq-5.9.0
    ACTIVEMQ_BASE: C:\apache-activemq-5.9.0\instance1
    ACTIVEMQ_CONF: C:\apache-activemq-5.9.0\conf
    ACTIVEMQ_DATA: C:\apache-activemq-5.9.0\data

    Could you please let me know as what went wrong.

    • Pascal Alma 07/03/2014 at 06:55 #

      But why weren’t you able to run the two instances? Do you get an error message?

      • suja 07/03/2014 at 07:28 #

        On running the instance2 after editing the xml’s below is the o/p

        ACTIVEMQ_BASE: C:\apache-activemq-5.9.0\cluster\broker-2
        ACTIVEMQ_CONF: C:\apache-activemq-5.9.0\conf
        ACTIVEMQ_DATA: C:\apache-activemq-5.9.0\data

        INFO | Database C:\apache-activemq-5.9.0\data\kahadb\lock is locked… waiting
        10 seconds for the database to be unlocked. Reason: java.io.IOException: File ‘C
        :\apache-activemq-5.9.0\data\kahadb\lock’ could not be locked.

        and im not able to access seperate admain pages for each instance.
        http://localhost:8161/admin/index.jsp. shows broker’s name as loacal host

  2. Pascal Alma 07/03/2014 at 07:43 #

    If correct you should have the following directory structure:
    C:\apache-activemq-5.9.0\cluster\broker-2\bin
    C:\apache-activemq-5.9.0\cluster\broker-2\conf
    C:\apache-activemq-5.9.0\cluster\broker-2\data

    and

    C:\apache-activemq-5.9.0\instance1\bin
    C:\apache-activemq-5.9.0\instance1\conf
    C:\apache-activemq-5.9.0\instance1\data

    Based on the error message I think you run the ‘default’ install that is under:
    C:\apache-activemq-5.9.0\bin

    Please can you check if you have the corresponding directory structures?

    • suja 07/03/2014 at 08:37 #

      My directory structures are the same

      • suja 07/03/2014 at 11:05 #

        I got the seperate instances by editing the respective .bat files, included the following

        set ACTIVEMQ_CONF=%ACTIVEMQ_BASE%/conf
        set ACTIVEMQ_DATA=%ACTIVEMQ_BASE%/data

      • Pascal Alma 07/03/2014 at 11:19 #

        But %ACTIVEMQ_BASE% is an environment variable that is the same for both instances. That’s why it is not working because both instances will then be still looking into the same folder. Why do you have to edit the bat files?

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