docker-debugging/chapter2.html at master · toshi38/docker-debugging · GitHub

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<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">

    <title>The problem</title>

    <meta name="apple-mobile-web-app-capable" content="yes" />
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    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">

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    <!--STARTCOURSESPECIFICSTYLES--><link rel="stylesheet" href="styles/styles.css"><!--ENDCOURSESPECIFICSTYLES-->
  </head>

  <body>
    <div id="pos"></div>
    <div class="reveal">
      <div class="slides">
        <section class="slide chaptertitle">
          <div class="slidecontent">
            <div class="chapternumber"> chapter 2 of 3 </div>
            <h1>The problem</h1>

          </div>
        </section>

        <!--STARTSECTIONINDEX--><section class="slide sectionlist">
  <div class="slidecontent">
    <h3>Sections in this chapter</h3>
    <ol>
    <li><a href="#/2">Our&nbsp;use&nbsp;case</a></li>
<li><a href="#/3">Introducing&nbsp;the&nbsp;problem</a></li>
    </ol>
  </div>
</section>
<!--ENDSECTIONINDEX-->
        <!--STARTCHAPTERCONTENT--><!--STARTSECTION1--><section>
  <section class="slide sectiontitle">
    <div class="slidecontent">
      <div class='sectioncount'>Section 1/2</div>
      <h3>Our use case</h3>
      <p>Guess a UUID</p>
</p>
    </div>
  </section>
  <section class="slide" data-pos="2-1-1">
<span class="pos">2-1-1</span>
<div class="slidecontent"><h3 id="a-simple-game-">A simple game*</h3>
<p><img style="max-width: 70%" src="resources/images/guess-a-uuid.png"></p>
<p><strong>* some cheating required...</strong></p>
</div></section><section class="slide" data-pos="2-1-2">
<span class="pos">2-1-2</span>
<div class="slidecontent"><h3 id="generating-the-uuid-">Generating the uuid:</h3>
<p><pre><code><span class="hljs-keyword">import</span> uuid <span class="hljs-keyword">from</span> <span class="hljs-string">'uuid/v4'</span>;

<span class="hljs-keyword">let</span> uuidToGuess;
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">resetUuid</span>(<span class="hljs-params"></span>) </span>{
  uuidToGuess = uuid();
}

resetUuid();</code></pre></p>
</div></section><section class="slide" data-pos="2-1-3">
<span class="pos">2-1-3</span>
<div class="slidecontent"><h3 id="serving-a-simple-page-">Serving a simple page:</h3>
<p><pre><code>app.get(<span class="hljs-string">'/'</span>, (req, res) =&gt; {
  res.status(<span class="hljs-number">200</span>).send(<span class="hljs-string">'&lt;h1&gt;Guess a uuid!&lt;/h1&gt;&lt;br&gt;'</span> +
    <span class="hljs-string">'Guess here: /guess/:uuid-to-guess&lt;br&gt;'</span> +
    <span class="hljs-string">'Reset Game Here: /reset'</span>);
});</code></pre></p>
</div></section><section class="slide" data-pos="2-1-4">
<span class="pos">2-1-4</span>
<div class="slidecontent"><h3 id="the-routes-">The routes:</h3>
<p><pre><code>app.get(<span class="hljs-string">'/guess/:uuid'</span>, (req, res) =&gt; {
  res.status(<span class="hljs-number">200</span>).json({<span class="hljs-string">'correct'</span>: uuidToGuess === req.params.uuid});
});

app.get(<span class="hljs-string">'/reset'</span>, (req, res) =&gt; {
  resetUuid();
  res.status(<span class="hljs-number">200</span>).send(<span class="hljs-string">'uuid to guess is now reset!'</span>);
});</code></pre></p>
</div></section><section class="slide" data-pos="2-1-5">
<span class="pos">2-1-5</span>
<div class="slidecontent"><h3 id="the-docker-file-">The docker file:</h3>
<p><pre><code><span class="hljs-keyword">FROM</span> node:<span class="hljs-number">8</span>

<span class="hljs-keyword">WORKDIR</span><span class="bash"> /work
</span><span class="hljs-keyword">COPY</span><span class="bash"> ./ /work/
</span><span class="hljs-comment">#RUN npm install</span>
<span class="hljs-comment">#RUN npm run build</span>
<span class="hljs-keyword">EXPOSE</span> <span class="hljs-number">8080</span>

<span class="hljs-keyword">CMD</span><span class="bash"> [<span class="hljs-string">"node"</span>, <span class="hljs-string">"server-build.js"</span>]</span></code></pre></p>
</div></section>
</section>
<!--ENDSECTION1-->
<!--STARTSECTION2--><section>
  <section class="slide sectiontitle">
    <div class="slidecontent">
      <div class='sectioncount'>Section 2/2</div>
      <h3>Introducing the problem</h3>
      <p>Debugging outside of Docker</p>
</p>
    </div>
  </section>
  <section class="slide" data-pos="2-2-1">
<span class="pos">2-2-1</span>
<div class="slidecontent"><h3 id="debug-in-ide">Debug in IDE</h3>
<ul>
<li>Run app as per normal</li>
<li>Set breakpoints</li>
<li>Dockerize app</li>
<li>Run Docker container</li>
<li><strong>Cross fingers!</strong></li>
</ul>
</div></section><section class="slide" data-pos="2-2-2">
<span class="pos">2-2-2</span>
<div class="slidecontent"><h3 id="configure-debugger-">Configure debugger:</h3>
<p><img style="max-width: 70%" src="resources/images/debugger-setup.png"></p>
</div></section><section class="slide" data-pos="2-2-3">
<span class="pos">2-2-3</span>
<div class="slidecontent"><h3 id="set-breakpoint-">Set breakpoint:</h3>
<p><img style="max-width: 70%" src="resources/images/breakpoint.png"></p>
</div></section><section class="slide" data-pos="2-2-4">
<span class="pos">2-2-4</span>
<div class="slidecontent"><h3 id="setup-source-maps-">Setup source maps:</h3>
<p><pre><code>  <span class="hljs-string">"scripts"</span>: {
    <span class="hljs-string">"test"</span>: <span class="hljs-string">"echo \"Error: no test specified\" &amp;&amp; exit 1"</span>,
    <span class="hljs-string">"serve"</span>: <span class="hljs-string">"babel-node server.js"</span>,
    <span class="hljs-string">"build"</span>: <span class="hljs-string">"babel server.js -o server-build.js --source-maps inline"</span>
  },
</code></pre></p>
</div></section><section class="slide" data-pos="2-2-5">
<span class="pos">2-2-5</span>
<div class="slidecontent"><h3 id="debugger-configured-with-source-maps">Debugger configured with source maps</h3>
<p><img style="max-width: 70%" src="resources/images/debugger-setup-sourcemap.png"></p>
</div></section><section class="slide" data-pos="2-2-6">
<span class="pos">2-2-6</span>
<div class="slidecontent"><h3 id="demo">Demo</h3>
<p><strong>Trying the game</strong></p>
</div></section><section class="slide" data-pos="2-2-7">
<span class="pos">2-2-7</span>
<div class="slidecontent"><h3 id="building-the-docker-image">Building the Docker image</h3>
<p><pre><code>$ docker build . -t game:s0
</code></pre></p>
</div></section><section class="slide" data-pos="2-2-8">
<span class="pos">2-2-8</span>
<div class="slidecontent"><h3 id="running-the-docker-image">Running the Docker image</h3>
<p><pre><code>$ docker run -p8080:8080 game:s0
</code></pre></p>
</div></section><section class="slide" data-pos="2-2-9">
<span class="pos">2-2-9</span>
<div class="slidecontent"><h3 id="running-detached">Running Detached</h3>
<p><pre><code>$ docker run -d -p8080:8080 game:s0
</code></pre></p>
</div></section><section class="slide" data-pos="2-2-10">
<span class="pos">2-2-10</span>
<div class="slidecontent"><h3 id="demo">Demo</h3>
<p><strong>Our isolated game</strong></p>
</div></section><section class="slide" data-pos="2-2-11">
<span class="pos">2-2-11</span>
<div class="slidecontent"><p><strong>Currently we have no way to debug our game while running in docker.</strong></p>
</div></section>
</section>
<!--ENDSECTION2--><!--ENDCHAPTERCONTENT-->


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