Functional overview

From version 5.4.0 onwards, ActiveMQ comes with a enhanced shell script for starting, stopping and managing the broker in Unix environment. For basic activemq and activemq-admin scripts functionality take a look at ActiveMQ Command Line Tools Reference.

This activemq script incorporate these two scripts into one and adds some new functionalities. On top of regular activemq and activemq-admin scripts, it adds the following features:

  • start - starts the broker in background. It saves process id in the ${ACTIVEMQ_DATA_DIR}/activemq.pid for future reference. It accepts the same command line arguments like the original activemq script, so you can do something like

  • console - starts the broker in foreground. It is basically the replacement for the old activemq script
    (you can interrupt the )

  • stop - stops the broker that is running in the background. It tries first to stop the broker using shutdown task. If that task doesn't return in 30 seconds (configurable), it will kill the process.
  • restart - stops the running instance (if there's one) and starts the new one
  • status - checks if activemq process is running
    (exitcode: 1 = broker is down, 0 = broker is up)
  • create - create an ACTIVEMQ_BASE directory that separates a broker instance from its binaries, i.e., it creates copies of the ActiveMQ configuration files into the command-line specified directory and points to the binaries. You can start the broker with the /bin scripts in the newly created instance.

  • browse - Display selected messages in a specified destination

  • bstat - Performs a predefined query that displays useful statistics regarding the specified broker

  • dstat - Performs a predefined query that displays useful tabular statistics regarding the specified destination type

  • decrypt - Decrypts given text

  • encrypt - Encrypts given text

  • export - Exports a stopped brokers data files to an archive file

  • list - Lists all available brokers in the specified JMX context

  • purge - Delete selected destination's messages that matches the message selector

  • query - Display selected broker component's attributes and statistics

Configuring the init-script

For ActiveMQ server to run properly some basic system variables must be set. These variables define how much memory broker will have, SSL, logging, JAAS options and similar.

Version 5.11.0 and higher

Configuration file of the init-script

Since version 5.11.0, all default configuration variables are moved to the new env script file, so that they can be easily inspected and configured in a easy way.
There are also other configuration locations

The script scans the following locations for configurations in the following order:

  1. /etc/default/activemq
  2. $HOME/.activemqrc
  3. $INSTALLDIR/apache-activemq-<version>/bin/env

The first existing file is read exclusively - all other files are ignored.
Undefined values are discovered in a automated way.

Running multiple instances

To use addtional configurations for running multiple instances on the same operating system rename or symlink script to a name matching to activemq-instance-<INSTANCENAME>.
This changes the configuration location to /etc/default/activemq-instance-<INSTANCENAME> and $HOME/.activemqrc-instance-<INSTANCENAME>. Configuration files in /etc have higher precedence.

Versions prior 5.11.0

These parameters were configurable in activemq script itself.

You could use setup command to create additional system wide defaults file to configure the broker.
(modify the settings in this file if neccessary - the default entries look a bit garbled due to an accidentally applied bugfix in this release)

The configuration of the script can be placed at /etc/default/activemq or $HOME/.activemqrc. Note, this is the configuration for the script not for configuring ActiveMQ.

To use addtional configurations for running multiple instances on the same operating system rename or symlink script to a name matching to activemq-instance-<INSTANCENAME>. This changes the configuration location to /etc/default/activemq-instance-<INSTANCENAME> and $HOME/.activemqrc-instance-<INSTANCENAME>. Configuration files in /etc have higher precedence.

Running activemq as a unix daemon

  • Install activemq broker as "root" to be run as "activemq"

  • Create a global default configuration and edit the configuration

    • Configure the java heap to a size suitable to your system environment and usage
    • Consider to move the folders "data", "tmp" and "conf" out of the installation path
  • Install the init script

  • Activate the init script at system startup
    (TODO: uncomplete)

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