<p>I am using Ubuntu 18.04.2 LTS.</p>
<p>I have executed:</p>
<pre><code>git clone https://github.com/openstreetmap/openstreetmap-website.git osm-repo
cd ./osm-repo
vagrant up
</code></pre>
<p>Despite the fact that something was wrong with Vagrant's SSH <a href="https://github.com/hashicorp/vagrant/issues/1659" data-hovercard-type="issue" data-hovercard-url="/hashicorp/vagrant/issues/1659/hovercard">(here's an example)</a>, I can successfully execute <code>vagrant ssh</code>, and now I'm in the OSM's VM.</p>
<p>Here's what happens when executing <code>bundler exec rails server</code>:</p>
<blockquote>
<p>=> Booting Puma<br>
=> Rails 5.2.3 application starting in development<br>
=> Run <code>rails server -h</code> for more startup options<br>
pngcrush worker: <code>pngcrush</code> not found; please provide proper binary or disable this worker (--no-pngcrush argument or <code>:pngcrush => false</code> through options)<br>
advpng worker: <code>advpng</code> not found; please provide proper binary or disable this worker (--no-advpng argument or <code>:advpng => false</code> through options)<br>
optipng worker: <code>optipng</code> not found; please provide proper binary or disable this worker (--no-optipng argument or <code>:optipng => false</code> through options)<br>
pngquant worker: <code>pngquant</code> not found; please provide proper binary or disable this worker (--no-pngquant argument or <code>:pngquant => false</code> through options)<br>
jhead worker: <code>jhead</code> not found, <code>jpegtran</code> not found; please provide proper binary or disable this worker (--no-jhead argument or <code>:jhead => false</code> through options)<br>
jpegoptim worker: <code>jpegoptim</code> not found; please provide proper binary or disable this worker (--no-jpegoptim argument or <code>:jpegoptim => false</code> through options)<br>
jpegtran worker: <code>jpegtran</code> not found; please provide proper binary or disable this worker (--no-jpegtran argument or <code>:jpegtran => false</code> through options)<br>
gifsicle worker: <code>gifsicle</code> not found; please provide proper binary or disable this worker (--no-gifsicle argument or <code>:gifsicle => false</code> through options)<br>
svgo worker: <code>svgo</code> not found; please provide proper binary or disable this worker (--no-svgo argument or <code>:svgo => false</code> through options)<br>
Puma starting in single mode...</p>
<ul>
<li>Version 3.12.1 (ruby 2.5.1-p57), codename: Llamas in Pajamas</li>
<li>Min threads: 5, max threads: 5</li>
<li>Environment: development</li>
<li>Listening on tcp://localhost:3000<br>
Use Ctrl-C to stop</li>
</ul>
</blockquote>
<p>That's the problem. Correctly, there are two problems:</p>
<ol>
<li>What should I do with those workers?</li>
<li>Why OSM listens on TCP? Absolutely every source says that it must listens on HTTP protocol, not on TCP. Maybe it is connected with these workers.</li>
</ol>
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