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<h1 id="upgrading-the-broker">Upgrading the Broker</h1>
<p>Apache ActiveMQ 5.x (and previous versions) is runnable out of the box by
executing the command: <code>./bin/activemq run</code>. The ActiveMQ Artemis broker
follows a different paradigm where the project distribution serves as the
broker &quot;home&quot; and one or more broker &quot;instances&quot; are created which reference
the &quot;home&quot; for resources (e.g. jar files) which can be safely shared between
broker instances. Therefore, an instance of the broker must be created before
it can be run. This may seems like an overhead at first glance, but it becomes
very practical when updating to a new Artemis version for example.</p>
<p>To create an Artemis broker instance navigate into the Artemis home folder and
run: <code>./bin/artemis create /path/to/myBrokerInstance</code> on the command line.</p>
<p>Because of this separation it&apos;s very easy to upgrade Artemis in most cases.</p>
<blockquote>
<p><strong>Note:</strong></p>
<p>It&apos;s recommended to choose a folder different from where Apache
Artemis was downloaded. This separation allows you run multiple broker
instances with the same Artemis &quot;home&quot; for example. It also simplifies
updating to newer versions of Artemis. </p>
</blockquote>
<h2 id="general-upgrade-procedure">General Upgrade Procedure</h2>
<p>Upgrading may require some specific steps noted in the <a href="versions.html">versions</a>,
but the general process is as follows:</p>
<ol>
<li>Navigate to the <code>etc</code> folder of the broker instance that&apos;s being upgraded</li>
<li><p>Open <code>artemis.profile</code> (<code>artemis.profile.cmd</code> on Windows). It contains a
property which is relevant for the upgrade:</p>
<pre><code>ARTEMIS_HOME=&apos;/path/to/apache-artemis-version&apos;
</code></pre></li>
</ol>
<p>If you run Artemis as a service on windows you have to do the following additional steps:</p>
<ol>
<li>Navigate to the <code>bin</code> folder of the broker instance that&apos;s being upgraded</li>
<li><p>Open <code>artemis-service.xml</code>. It contains a property which is relevant for the upgrade:</p>
<pre><code>&lt;env name=&quot;ARTEMIS_HOME&quot; value=&quot;/path/to/apache-artemis-version&quot;/&gt;
</code></pre></li>
</ol>
<p>The <code>ARTEMIS_HOME</code> property is used to link the instance with the home. <em>In
most cases</em> the instance can be upgraded to a newer version simply by changing
the value of this property to the location of the new broker home. Please refer
to the aforementioned <a href="versions.html">versions</a> document for additional upgrade
steps (if required).</p>
<p>It is also possible to do many of these update steps automatically as can be seen in the next section.</p>
<h2 id="upgrading-tool">Upgrading tool</h2>
<p>An upgrade helper tool from the new broker download can be used to refresh various configuration files
and scripts from an existing broker instance from a prior version, and thus automate much of work to upgrade
the instance to use the new version.</p>
<blockquote>
<p>You should back up your existing broker instance before running the command.</p>
</blockquote>
<pre><code class="lang-shell">cd $NEW_ARTEMIS_DOWNLOAD/bin/
./artemis upgrade PATH_TO_UPGRADING_INSTANCE
</code></pre>
<p>The broker instance <code>bin/artemis</code> script and <code>etc/artemis.profile</code>(artemis.cmd and artemis.cmd.profile on Windows)
will be updated to the new versions, setting its ARTEMIS_HOME to refer to the new broker version home path. The tool
will also create the new <code>&lt;instance&gt;/etc/log4j2.properties</code> configuration file if needed (e.g if you are migrating
from a version prior to 2.27.0), and remove the old <code>&lt;instance&gt;/etc/logging.properties</code> file if present.</p>
<p>The broker.xml file and data are retained as-is.</p>
<blockquote>
<p><strong>Note:</strong></p>
<p>Most existing customisations to the old configuration files and scripts will be lost in the process of refreshing the
files. As such you should compare the old configuration files with the refreshed ones and then port any missing
customisations you may have made as necessary. The upgrade command itself will copy the older files it changes to
an old-config-bkp.<index> folder within the instance dir.</index></p>
<p>Similarly, if you had customised the old logging.properties file you may need to prepare analogous changes for the
new log4j2.properties file.</p>
</blockquote>
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