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<div class="navheader"><table width="100%" summary="Navigation header"><tr><td width="20%" align="left"><a accesskey="p" href="ports.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="sfx.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="relx"></a>Chapter 9. Releases</h2></div></div></div><p>Erlang.mk relies on <span class="emphasis"><em>Relx</em></span> for generating releases. This
chapter covers the Erlang.mk-specific bits. Consult the
<a class="ulink" href="https://erlware.github.io/relx/" target="_top">Relx website</a> for more information.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_setup"></a>9.1. Setup</h2></div></div></div><p>Erlang.mk will create a release if it detects a Relx configuration
file in the <span class="emphasis"><em>$(RELX_CONFIG)</em></span> location. This defaults to
<span class="emphasis"><em>$(CURDIR)/relx.config</em></span>. You can override it by defining
the variable before including Erlang.mk:</p><pre class="programlisting">RELX_CONFIG = $(CURDIR)/webchat.config</pre><p>Relx does not need to be installed. Erlang.mk will download
and build it automatically.</p><p>The Relx executable will be saved in the <span class="emphasis"><em>$(RELX)</em></span> file. This
location defaults to <span class="emphasis"><em>$(CURDIR)/relx</em></span> and can be overriden.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_configuration"></a>9.2. Configuration</h2></div></div></div><p>You can specify additional Relx options using the <code class="literal">RELX_OPTS</code>
variable. For example, to enable <code class="literal">dev_mode</code>:</p><pre class="programlisting">RELX_OPTS = -d true</pre><p>While you can specify the output directory for the release
in the Relx options directly, Erlang.mk provides a specific
variable for it: <code class="literal">RELX_OUTPUT_DIR</code>. It defaults to the <span class="emphasis"><em>_rel</em></span>
directory. You can also override it:</p><pre class="programlisting">RELX_OUTPUT_DIR = /path/to/staging/directory</pre></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_generating_the_release"></a>9.3. Generating the release</h2></div></div></div><p>Now that you’re all set, all you need to do is generate the
release. As mentioned before, Erlang.mk will automatically
generate it when it detects the <span class="emphasis"><em>$(RELX_CONFIG)</em></span> file. This
means the following command will also build the release:</p><pre class="programlisting">$ make</pre><p>If you need to generate the release, and only the release,
the <code class="literal">rel</code> target can be used:</p><pre class="programlisting">$ make rel</pre><p>Erlang.mk always generates a tarball alongside the release,
which can be directly uploaded to a server. The tarball is
located at <code class="literal">$(RELX_OUTPUT_DIR)/<name>/<name>-<vsn>.tar.gz</code>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_running_the_release"></a>9.4. Running the release</h2></div></div></div><p>Erlang.mk provides a convenience function for running the
release with one simple command:</p><pre class="programlisting">$ make run</pre><p>This command will also build the project and generate the
release if they weren’t already. It starts the release in
<span class="emphasis"><em>console mode</em></span>, meaning you will also have a shell ready to
use to check things as needed.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_upgrading_a_release"></a>9.5. Upgrading a release</h2></div></div></div><p>Erlang.mk provides a <code class="literal">relup</code> target for generating release
upgrades. Release upgrades allow updating the code and the
state of a running release without restarting it.</p><p>Once your changes are done, you need to update the version
of the application(s) that will be updated. You also need
to update the version of the release.</p><p>For each application that needs to be updated, an
<a class="ulink" href="http://erlang.org/doc/man/appup.html" target="_top">appup file</a>
must be written. Refer to the Erlang/OTP documentation
for more details.</p><p>For the purpose of this section, assume the initial release
version was <code class="literal">1</code>, and the new version is <code class="literal">2</code>. The name of the
release will be <code class="literal">example</code>.</p><p>Once all this is done, you can build the tarball for the
release upgrade:</p><pre class="programlisting">$ make relup</pre><p>This will create an archive at the root directory of the
release, <code class="literal">$RELX_OUTPUT_DIR/example/example-2.tar.gz</code>.</p><p>Move the archive to the correct location on the running
node. From the release’s root directory:</p><pre class="programlisting">$ mkdir releases/2/
$ mv path/to/example-2.tar.gz releases/2/</pre><p>Finally, upgrade the release:</p><pre class="programlisting">$ bin/example_release upgrade "2/example_release"</pre><p>Or on Windows:</p><pre class="programlisting">$ bin/example_release.cmd upgrade "2/example_release"</pre><p>Your release was upgraded!</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ports.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="code.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sfx.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div>
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