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<html>
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<head>
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<title>Running mod_perl with Mojolicious in Docker</title>
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<meta name="description" content="Running Apache mod_perl and Mojolicious in Docker" />
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<meta name="keywords" content="mojolicious mojo mod_perl docker apache" />
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<meta charset="UTF-8" />
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<link rel="stylesheet" href="/index.css"/>
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</head>
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<body>
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<div>
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<a href="/"><< back</a>
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<h1 id="running-mod_perl-with-mojolicious-in-docker">Running mod_perl with Mojolicious in Docker</h1>
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<p>
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I've been working under an old Apache <code>mod_perl</code> setup. I wanted to use Mojolicious for some new services,
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but I needed to stay within <code>mod_perl</code>, so I decided to go all the way and Dockerize it. After scouring the <code>mod_perl</code> documentation,
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Plack + Mojolicious configs, and finding an image, I hit the ground running and documented my steps.
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</p>
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<a href="http://perl.apache.org/">
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<img src="mod_perl.gif" alt="mod_perl banner" />
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</a>
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<p>I love old banners :)</p>
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<h3 id="generate-your-config">Generate your config</h3>
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<p>Thanks to <a href="https://github.com/motemen/docker-mod_perl">motemen</a> for some nicely pre-configured
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<code>mod_perl</code> and <code>Apache2</code> images. We're targetting <code>Perl v5.36</code>, and <code>Apache 2.4.58</code> here.
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We'll also add the include statement for our <code>VirtualHost</code> configuration file that we'll make later.
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</p>
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<pre>
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<code>docker <span class="hljs-keyword">run</span> --<span class="hljs-keyword">rm</span> motemen/mod_perl:5.36.0-2.4.58 <span class="hljs-keyword">cat</span> /usr/<span class="hljs-keyword">local</span>/apache2/<span class="hljs-keyword">conf</span>/httpd.<span class="hljs-keyword">conf</span> > httpd.<span class="hljs-keyword">conf</span>
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echo '<span class="hljs-keyword">Include</span> /usr/<span class="hljs-keyword">local</span>/apache2/<span class="hljs-keyword">conf</span>/mojolicious.<span class="hljs-keyword">conf</span>' >> httpd.<span class="hljs-keyword">conf</span>
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</code>
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</pre>
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<p>
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This will leave you with a <code>httpd.conf</code> that will get picked up by Apache when we run it under docker.
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</p>
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<h3 id="enable-prefork-mpm-instead-of-event-mpm">Enable Prefork MPM instead of Event MPM</h3>
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<p>
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I couldn't get Apache to run without disabling Event MPM and enabling Prefork MPM.
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</p>
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<p>In <code>httpd.conf</code>:</p>
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<pre>
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<code>
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<span class="hljs-selector-id">#LoadModule</span> mpm_event_module modules/mod_mpm_event<span class="hljs-selector-class">.so</span>
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LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
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</code>
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</pre>
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<h3 id="write-your-application">Write your application</h3>
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<p>
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All you need to do is write a Mojo application. In this case, I'm using <code>Mojolicious::Lite</code> but this can
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be done with the whole MVC setup easily as well. Just make sure you have a sub that returns your <code>app</code> so you can
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pass it to <code>Plack::Builder</code>.
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</p>
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<p>In <code>lib/App.pm</code>:</p>
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<pre>
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<code class="lang-perl">
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<span class="hljs-keyword">package</span> App;
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<span class="hljs-keyword">use</span> <span class="hljs-number">5.036</span>;
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<span class="hljs-keyword">use</span> Mojolicious::Lite -signatures;
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<span class="hljs-function"><span class="hljs-keyword">sub</span> <span class="hljs-title">get_app</span> </span>{ app; }
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get <span class="hljs-string">'/'</span> => <span class="hljs-function"><span class="hljs-keyword">sub</span> </span>{
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<span class="hljs-keyword">shift</span>->render( <span class="hljs-string">text =></span> <span class="hljs-string">"Hello World!"</span> );
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};
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<span class="hljs-number">1</span>;
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</code></pre>
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<h3 id="write-your-plack-shim">Write your Plack shim</h3>
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<p>
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Here we write a simple <code>.psgi</code> file that
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will use our <code>App</code> library and <code>Plack::Builder</code> to
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create a <code>PSGI</code> application for <code>Plack::Handler::Apache2</code> to pickup.
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</p>
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<p>In <code>app.psgi</code>:</p>
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<pre>
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<code>use <span class="hljs-number">5.036</span>;
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use <span class="hljs-class"><span class="hljs-keyword">lib</span> '<span class="hljs-title">lib</span>';</span>
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use App;
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use Plack::Builder;
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builder {
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<span class="hljs-symbol">App:</span>:get_app->start;
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};
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</code>
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</pre>
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<h3 id="write-your-mod_perl-apache-conf">Write your mod_perl Apache config</h3>
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<p>
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Very straight-forward, just tell Apache where to find our script, and what handler to use.
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</p>
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<p>In <code>mojolicious.conf</code>:</p>
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<pre>
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<code>
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<span class="hljs-attribute"><span class="hljs-nomarkup">LoadModule</span></span> perl_module modules/mod_perl.so
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<span class="hljs-section"><VirtualHost *:80></span>
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<span class="hljs-section"><Location /></span>
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<span class="hljs-attribute"><span class="hljs-nomarkup">SetHandler</span></span> perl-script
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<span class="hljs-attribute">PerlResponseHandler</span> Plack::Handler::Apache2
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<span class="hljs-attribute">PerlSetVar</span> psgi_app /app.psgi
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<span class="hljs-section"></Location></span>
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<span class="hljs-section"></VirtualHost></span>
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</code>
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</pre>
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<h3 id="write-your-dockerfile">Write your Dockerfile</h3>
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<p>
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Now all thats left is making a <code>Dockerfile</code>.
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We'll use one of <a href="https://github.com/motemen/docker-mod_perl">motemen</a>'s images,
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and copy all of the pre-reqs over, install some libraries, you know, Docker stuff.
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</p>
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<p>In <code>Dockerfile</code>:</p>
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<pre>
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<code class="lang-docker">
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<span class="hljs-keyword">FROM</span> motemen/mod_perl:<span class="hljs-number">5.36</span>.<span class="hljs-number">0</span>-<span class="hljs-number">2.4</span>.<span class="hljs-number">58</span>-<span class="hljs-number">2.0</span>.<span class="hljs-number">13</span>
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<span class="hljs-keyword">COPY</span><span class="bash"> app.psgi /app.psgi
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</span><span class="hljs-keyword">COPY</span><span class="bash"> lib /usr/<span class="hljs-built_in">local</span>/apache2/lib
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</span><span class="hljs-keyword">COPY</span><span class="bash"> httpd.conf /usr/<span class="hljs-built_in">local</span>/apache2/conf/httpd.conf
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</span><span class="hljs-keyword">COPY</span><span class="bash"> mojolicious.conf /usr/<span class="hljs-built_in">local</span>/apache2/conf/mojolicious.conf
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</span><span class="hljs-keyword">RUN</span><span class="bash"> apt-get update -y && apt-get install -y wget make build-essential
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</span><span class="hljs-keyword">RUN</span><span class="bash"> cpan -iT Plack Mojolicious
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</span><span class="hljs-keyword">EXPOSE</span> <span class="hljs-number">80</span>
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<span class="hljs-keyword">CMD</span><span class="bash"> [<span class="hljs-string">"httpd-foreground"</span>]</span>
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</code>
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</pre>
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<h3 id="run-with-docker">Run with Docker</h3>
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<p>Now we can make it go!</p>
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<pre>
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<code class="lang-shell"><span class="hljs-symbol">$</span> docker build . -t <span class="hljs-built-in">mod</span>-perl
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<span class="hljs-symbol">$</span> docker run -p <span class="hljs-number">80</span>:<span class="hljs-number">80</span> <span class="hljs-built-in">mod</span>-perl
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<span class="hljs-symbol">$</span> curl http:<span class="hljs-comment">//localhost:80/</span>
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"Hello World!"
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</code>
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</pre>
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<h3 id="running-with-auto-reloading-for-development-">Running with auto-reloading (for development)</h3>
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<p>You can make this auto-reload if you use a docker volume for <code>lib/</code> against <code>/usr/local/apache2/lib/</code></p>
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<h3 id="source-code">An example?</h3>
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<p>
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An <a href="https://github.com/rawleyfowler/mojolicious-mod-perl-example">example</a> is available on my github.
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</p>
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</div>
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</body>
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</html>
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