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<body>
<p><a href="index.html">retour</a></p>
<h1 id="docker">Docker</h1>
<h2 id="un-survol-de-la-chose">Un survol de la chose</h2>
<p>L’intéret des containers (et en particulier de Docker) en une
illustration :</p>
<figure>
<img src="img/Docker-technology.png" alt="Docker vs VM" />
<figcaption aria-hidden="true">Docker vs VM</figcaption>
</figure>
<p>De plus Docker a construit tout un écosystème cohérent :</p>
<ul>
<li>DockerHub : c’est le github des images Docker. D’ailleurs les
commandes reprennent un peu la même syntaxe : pull, commit, push en
particulier.</li>
<li>Docker-compose (anciennement fig) : pour déclarer facilement
l’agencement de plusieurs Dockers entre eux</li>
<li>Docker-machine : provisionning dans le cloud de containers.
Fonctionne avec AWS, Microsoft Azure, Digital Ocean… ou même VirtualBox
en local.</li>
<li>Docker-swarm : solution de clustering pour Docker.</li>
</ul>
<p>On peut définir Docker en définissant ses 3 composants essentiels
:</p>
<ul>
<li>les images</li>
<li>les registries</li>
<li>les containers</li>
</ul>
<h3 id="les-images-docker">Les images Docker</h3>
<p>Une image Docker est un template de logiciel en lecture seule. Par
exemple, une image peut contenir une système d’exploitation ubuntu, avec
Nginx et votre application web installés. Les images servent à créer des
containers Docker.</p>
<p>Docker permet de créer de nouvelles images, ou d’en amender des
images existantes ; ou bien, il est possible de télécharger des images
que d’autres ont créées depuis les registries.</p>
<h3 id="les-registries-docker">Les registries Docker</h3>
<p>Les registries Docker. Il y a des espaces privés ou public sur
lequels vous pouvez pousser ou récupérer des images. Le registry public
de Docker est http://hub.docker.com. On y trouve une large collection
d’images prêtes à l’emploi.</p>
<h3 id="les-containers-docker">Les containers Docker</h3>
<p>Les containers Docker “hébergent” une ou plusieurs images Docker. Les
containers Docker peuvent être démarrés, arrêtés, déplacés, … Chaque
container est une plateforme isolée et sécurisé.</p>
<h2 id="installation">Installation</h2>
<ul>
<li>Sur un linux, kernel > 3.8 : normalement disponible dans toutes
les bonnes ditributions récentes du marché</li>
<li>Sous mac ou Windows, depuis cette année, il y a aussi une version
native : https://www.docker.com/</li>
</ul>
<h2 id="alors-ces-images">Alors, ces images</h2>
<p>On peut commencer par chercher dans le registry :</p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker search ubuntu</span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="ex">NAME</span> DESCRIPTION STARS OFFICIAL AUTOMATED</span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="ex">ubuntu</span> Ubuntu is a Debian-based Linux operating s... 2362 <span class="pp">[</span><span class="ss">OK</span><span class="pp">]</span></span>
<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="ex">ubuntu-upstart</span> Upstart is an event-based replacement for ... 35 <span class="pp">[</span><span class="ss">OK</span><span class="pp">]</span></span>
<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a><span class="ex">torusware/speedus-ubuntu</span> Always updated official Ubuntu docker imag... 25 <span class="pp">[</span><span class="ss">OK</span><span class="pp">]</span></span>
<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a><span class="ex">tleyden5iwx/ubuntu-cuda</span> Ubuntu 14.04 with CUDA drivers pre-installed 18 <span class="pp">[</span><span class="ss">OK</span><span class="pp">]</span></span>
<span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a><span class="ex">...</span></span></code></pre></div>
<p>À noter le statut officiel de certaines images. Les noms avec un /
viennent d’un utilisateur de dockerHub (nommenclature login/repository
comme sur github).</p>
<p>On récupère l’image, via un <code>pull</code>.</p>
<div class="sourceCode" id="cb2"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker pull ubuntu</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Using</span> default tag: latest</span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="ex">latest:</span> Pulling from library/ubuntu</span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="ex">d3a1f33e8a5a:</span> Downloading [========================================<span class="op">></span> ] 53.51 MB/65.79 MB</span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="ex">c22013c84729:</span> Download complete</span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a><span class="ex">d74508fb6632:</span> Download complete</span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="ex">91e54dfb1179:</span> Download complete</span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a><span class="ex">...</span></span></code></pre></div>
<p>On peut à présent lister les images que l’on a localement :</p>
<div class="sourceCode" id="cb3"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker images</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="ex">REPOSITORY</span> TAG IMAGE ID CREATED VIRTUAL SIZE</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="ex">ubuntu</span> latest 91e54dfb1179 6 weeks ago 188.4 MB</span></code></pre></div>
<p>Première commande indispensable :</p>
<div class="sourceCode" id="cb4"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker run ubuntu:latest /bin/echo <span class="st">'Hello World!'</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span> World!</span></code></pre></div>
<p>Wow ! Une fois le conteneur instancié, Docker a exécuté la commande
<code>/bin/echo 'Hello World!'</code> à l’intérieur de celui-ci et nous
a retourné le résultat : Hello World! Ensuite, le container s’est
terminé.</p>
<p>D’ailleurs, on peut le retrouvé via la commande <code>ps</code>:</p>
<div class="sourceCode" id="cb5"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker ps <span class="at">-a</span></span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="ex">CONTAINER</span> ID IMAGE COMMAND CREATED STATUS PORTS NAMES</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="ex">b104d0657323</span> ubuntu:latest <span class="st">"/bin/echo 'Hello Wor"</span> 41 seconds ago Exited <span class="er">(</span><span class="ex">0</span><span class="kw">)</span> <span class="ex">40</span> seconds ago compassionate_yalow</span></code></pre></div>
<p>Il est possible de se connecter en lancant une session interactive
<code>-i</code> dans un terminal <code>-t</code> et en y executant bash
:</p>
<div class="sourceCode" id="cb6"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker run <span class="at">-t</span> <span class="at">-i</span> ubuntu:latest /bin/bash</span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="ex">root@5aff723e8730:/#</span></span></code></pre></div>
<p>Il est également possible de lancer un container en mode daemon
<code>-d</code> :</p>
<div class="sourceCode" id="cb7"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker run <span class="at">-d</span> ubuntu:latest /bin/bash <span class="at">-c</span> <span class="st">"while true; do echo Hello; sleep 1; done"</span></span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="ex">8787bcb7fde348d039dc487c1bdda294d1c636de2df645362267dba7d7e6af3e</span></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker ps</span>
<span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a><span class="ex">CONTAINER</span> ID IMAGE COMMAND CREATED STATUS PORTS NAMES</span>
<span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a><span class="ex">8787bcb7fde3</span> ubuntu:latest <span class="st">"/bin/bash -c 'while "</span> 4 seconds ago Up 3 seconds cranky_swartz</span>
<span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb7-8"><a href="#cb7-8" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker logs cranky_swartz</span>
<span id="cb7-9"><a href="#cb7-9" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-10"><a href="#cb7-10" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-11"><a href="#cb7-11" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-12"><a href="#cb7-12" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-13"><a href="#cb7-13" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-14"><a href="#cb7-14" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-15"><a href="#cb7-15" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-16"><a href="#cb7-16" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-17"><a href="#cb7-17" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-18"><a href="#cb7-18" aria-hidden="true" tabindex="-1"></a><span class="ex">Hello</span></span>
<span id="cb7-19"><a href="#cb7-19" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb7-20"><a href="#cb7-20" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker stop cranky_swartz</span>
<span id="cb7-21"><a href="#cb7-21" aria-hidden="true" tabindex="-1"></a><span class="ex">cranky_swartz</span></span></code></pre></div>
<h2
id="quelques-commandes-supplémentaires-pour-manipuler-les-containers">Quelques
commandes supplémentaires pour manipuler les containers</h2>
<p>On peut relancer un container précédemment arrêté :</p>
<div class="sourceCode" id="cb8"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker start cranky_swartz</span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="ex">cranky_swartz</span></span></code></pre></div>
<p>La fonction <code>pause</code> / <code>unpause</code>:</p>
<div class="sourceCode" id="cb9"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker pause cranky_swartz</span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a><span class="ex">cranky_swartz</span></span>
<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker unpause cranky_swartz</span>
<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a><span class="ex">cranky_swartz</span></span></code></pre></div>
<p>Enfin, on peut se connecter à un container actuellement lancé via
:</p>
<div class="sourceCode" id="cb10"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker attach cranky_swartz</span>
<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a><span class="ex">[CTRL-C]</span></span>
<span id="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a><span class="ex">root@82a7a75b7d25:/#</span></span></code></pre></div>
<p>Pourquoi le <code>CTRL-C</code> ? en fait, le attach ne peut utiliser
qu’une seule instance de shell, donc on doit killer le shell existant
pour y accéder.</p>
<p>À noter que si on quitte en faisant <code>exit</code>, on stop le
container. Pas très pratique.</p>
<p>Au final comment se connecte-t-on à notre container sans le stopper à
la sortie ?</p>
<ul>
<li>soit on lance le <em>attach</em> avec l’option –no-sig=true</li>
<li>soit on sort avec <code>CTRL-P CTRL-Q</code></li>
<li>soit on lance un deuxième bash via</li>
</ul>
<div class="sourceCode" id="cb11"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker exec <span class="at">-it</span> cranky_swartz /bin/bash</span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="ex">root@82a7a75b7d25:/#</span></span></code></pre></div>
<p>Méthode winner / (depuis docker >= 1.3). cf
https://askubuntu.com/questions/505506/how-to-get-bash-or-ssh-into-a-running-container-in-background-mode</p>
<p>voilà, fin de la première partie.</p>
<h2 id="publication-sur-dockerhub">Publication sur DockerHub</h2>
<p>Lorsque l’on fait des modification dans un container, on peut
comparer à l’image d’origine</p>
<div class="sourceCode" id="cb12"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker diff cranky_swartz</span></code></pre></div>
<p>On peut alors commiter, et tagger :</p>
<div class="sourceCode" id="cb13"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker commit ....</span></code></pre></div>
<p>Enfin, pour publier sur DockerHub, on se connecte (avec un compte
préalablement créé bien sûr)</p>
<div class="sourceCode" id="cb14"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker login</span>
<span id="cb14-2"><a href="#cb14-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Username:</span></span>
<span id="cb14-3"><a href="#cb14-3" aria-hidden="true" tabindex="-1"></a><span class="ex">Passwords:</span></span>
<span id="cb14-4"><a href="#cb14-4" aria-hidden="true" tabindex="-1"></a><span class="ex">Email:</span></span></code></pre></div>
<p>On peut alors pousser sur le Hub :</p>
<div class="sourceCode" id="cb15"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker push bobuss/mySublimeImage</span></code></pre></div>
<h2 id="le-dockerfile">Le Dockerfile</h2>
<p>La vrai façon de spécifier une image docker consiste à la décrire
dans un fichier Dockerfile. Il y a toute une syntaxe pour cela.</p>
<p>On va commencer par une image toute simple, qui embarque un programme
node.js qui répond un hello world basique.</p>
<h3 id="le-fichier-index.js">Le fichier index.js</h3>
<div class="sourceCode" id="cb16"><pre
class="sourceCode javascript"><code class="sourceCode javascript"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> express <span class="op">=</span> <span class="pp">require</span>(<span class="st">'express'</span>)<span class="op">;</span></span>
<span id="cb16-2"><a href="#cb16-2" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> app <span class="op">=</span> <span class="fu">express</span>()<span class="op">;</span></span>
<span id="cb16-3"><a href="#cb16-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb16-4"><a href="#cb16-4" aria-hidden="true" tabindex="-1"></a>app<span class="op">.</span><span class="fu">get</span>(<span class="st">'/'</span><span class="op">,</span> <span class="kw">function</span> (req<span class="op">,</span> res) {</span>
<span id="cb16-5"><a href="#cb16-5" aria-hidden="true" tabindex="-1"></a> res<span class="op">.</span><span class="fu">send</span>(<span class="st">'Hello from Docker !!'</span>)<span class="op">;</span></span>
<span id="cb16-6"><a href="#cb16-6" aria-hidden="true" tabindex="-1"></a>})<span class="op">;</span></span>
<span id="cb16-7"><a href="#cb16-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb16-8"><a href="#cb16-8" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> server <span class="op">=</span> app<span class="op">.</span><span class="fu">listen</span>(<span class="dv">8080</span><span class="op">,</span> <span class="kw">function</span> () {</span>
<span id="cb16-9"><a href="#cb16-9" aria-hidden="true" tabindex="-1"></a> <span class="kw">var</span> host <span class="op">=</span> server<span class="op">.</span><span class="fu">address</span>()<span class="op">.</span><span class="at">address</span><span class="op">;</span></span>
<span id="cb16-10"><a href="#cb16-10" aria-hidden="true" tabindex="-1"></a> <span class="kw">var</span> port <span class="op">=</span> server<span class="op">.</span><span class="fu">address</span>()<span class="op">.</span><span class="at">port</span><span class="op">;</span></span>
<span id="cb16-11"><a href="#cb16-11" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb16-12"><a href="#cb16-12" aria-hidden="true" tabindex="-1"></a> <span class="bu">console</span><span class="op">.</span><span class="fu">log</span>(<span class="st">'Example app listening at http://%s:%s'</span><span class="op">,</span> host<span class="op">,</span> port)<span class="op">;</span></span>
<span id="cb16-13"><a href="#cb16-13" aria-hidden="true" tabindex="-1"></a>})<span class="op">;</span></span>
<span id="cb16-14"><a href="#cb16-14" aria-hidden="true" tabindex="-1"></a></span></code></pre></div>
<h3 id="les-dépendances-javascript-dans-un-package.json">Les dépendances
javascript dans un package.json</h3>
<div class="sourceCode" id="cb17"><pre
class="sourceCode json"><code class="sourceCode json"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="fu">{</span></span>
<span id="cb17-2"><a href="#cb17-2" aria-hidden="true" tabindex="-1"></a> <span class="dt">"name"</span><span class="fu">:</span> <span class="st">"dockerapp"</span><span class="fu">,</span></span>
<span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a> <span class="dt">"dependencies"</span><span class="fu">:</span> <span class="fu">{</span></span>
<span id="cb17-4"><a href="#cb17-4" aria-hidden="true" tabindex="-1"></a> <span class="dt">"express"</span><span class="fu">:</span> <span class="st">"^4.13.3"</span></span>
<span id="cb17-5"><a href="#cb17-5" aria-hidden="true" tabindex="-1"></a> <span class="fu">}</span></span>
<span id="cb17-6"><a href="#cb17-6" aria-hidden="true" tabindex="-1"></a><span class="fu">}</span></span></code></pre></div>
<h3 id="le-dockerfile-1">Le Dockerfile</h3>
<div class="sourceCode" id="cb18"><pre
class="sourceCode dockerfile"><code class="sourceCode dockerfile"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="co"># depuis l'image officielle ubuntu</span></span>
<span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a><span class="kw">FROM</span> ubuntu</span>
<span id="cb18-3"><a href="#cb18-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-4"><a href="#cb18-4" aria-hidden="true" tabindex="-1"></a><span class="co"># ca c'est moi</span></span>
<span id="cb18-5"><a href="#cb18-5" aria-hidden="true" tabindex="-1"></a><span class="kw">MAINTAINER</span> bobuss</span>
<span id="cb18-6"><a href="#cb18-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-7"><a href="#cb18-7" aria-hidden="true" tabindex="-1"></a><span class="co"># on execute des commandes dans le container</span></span>
<span id="cb18-8"><a href="#cb18-8" aria-hidden="true" tabindex="-1"></a><span class="kw">RUN</span> <span class="ex">apt-get</span> update <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb18-9"><a href="#cb18-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">apt-get</span> <span class="at">-y</span> install curl <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb18-10"><a href="#cb18-10" aria-hidden="true" tabindex="-1"></a> <span class="ex">apt-get</span> <span class="at">-y</span> install sudo <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb18-11"><a href="#cb18-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">curl</span> <span class="at">-sL</span> https://deb.nodesource.com/setup_6.x <span class="kw">|</span> <span class="fu">sudo</span> bash <span class="at">-</span> <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb18-12"><a href="#cb18-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">apt-get</span> <span class="at">-y</span> install python build-essential nodejs</span>
<span id="cb18-13"><a href="#cb18-13" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-14"><a href="#cb18-14" aria-hidden="true" tabindex="-1"></a><span class="co"># on ajoute le contenu du répertoire courant dans le container</span></span>
<span id="cb18-15"><a href="#cb18-15" aria-hidden="true" tabindex="-1"></a><span class="co"># dans /src</span></span>
<span id="cb18-16"><a href="#cb18-16" aria-hidden="true" tabindex="-1"></a><span class="kw">ADD</span> . /src</span>
<span id="cb18-17"><a href="#cb18-17" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-18"><a href="#cb18-18" aria-hidden="true" tabindex="-1"></a><span class="co"># on s'y deplace, et on lance le npm install</span></span>
<span id="cb18-19"><a href="#cb18-19" aria-hidden="true" tabindex="-1"></a><span class="kw">RUN</span> <span class="bu">cd</span> /src <span class="kw">&&</span> <span class="ex">npm</span> install</span>
<span id="cb18-20"><a href="#cb18-20" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-21"><a href="#cb18-21" aria-hidden="true" tabindex="-1"></a><span class="co"># on ouvre le port 8080</span></span>
<span id="cb18-22"><a href="#cb18-22" aria-hidden="true" tabindex="-1"></a><span class="kw">EXPOSE</span> 8080</span>
<span id="cb18-23"><a href="#cb18-23" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb18-24"><a href="#cb18-24" aria-hidden="true" tabindex="-1"></a><span class="co"># et on lance la commande node /src/index.js</span></span>
<span id="cb18-25"><a href="#cb18-25" aria-hidden="true" tabindex="-1"></a><span class="kw">CMD</span> [<span class="st">"node"</span>, <span class="st">"/src/index.js"</span>]</span></code></pre></div>
<p>On construit l’image. On donne un tag avec l’option <code>-t</code>.
À Noter la nommenclature <code>username/projet</code> à la github, qui
est repris par DockerHub.</p>
<div class="sourceCode" id="cb19"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb19-1"><a href="#cb19-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker build <span class="at">-t</span> bobuss/node .</span>
<span id="cb19-2"><a href="#cb19-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Sending</span> build context to Docker daemon 3.584 kB</span>
<span id="cb19-3"><a href="#cb19-3" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 0 : FROM ubuntu</span>
<span id="cb19-4"><a href="#cb19-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> 91e54dfb1179</span>
<span id="cb19-5"><a href="#cb19-5" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 1 : MAINTAINER bobuss</span>
<span id="cb19-6"><a href="#cb19-6" aria-hidden="true" tabindex="-1"></a><span class="ex">...</span></span>
<span id="cb19-7"><a href="#cb19-7" aria-hidden="true" tabindex="-1"></a><span class="ex">...</span></span>
<span id="cb19-8"><a href="#cb19-8" aria-hidden="true" tabindex="-1"></a><span class="ex">...</span></span>
<span id="cb19-9"><a href="#cb19-9" aria-hidden="true" tabindex="-1"></a><span class="ex">Successfully</span> built 04efea301f68</span>
<span id="cb19-10"><a href="#cb19-10" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb19-11"><a href="#cb19-11" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker images</span>
<span id="cb19-12"><a href="#cb19-12" aria-hidden="true" tabindex="-1"></a><span class="ex">REPOSITORY</span> TAG IMAGE ID CREATED VIRTUAL SIZE</span>
<span id="cb19-13"><a href="#cb19-13" aria-hidden="true" tabindex="-1"></a><span class="ex">bobuss/node</span> latest 04efea301f68 25 seconds ago 387.6 MB</span></code></pre></div>
<p>Et on lance maintenant notre container node.</p>
<p>Attention au port ! Le programme node expose le port 8080 dans le
container. Il faut binder ce port sur un port de la machine locale via
l’option <code>-p</code>.</p>
<p>Par exemple :</p>
<div class="sourceCode" id="cb20"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb20-1"><a href="#cb20-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker run <span class="at">-d</span> <span class="at">-p</span> 8080:8080 bobuss/node</span>
<span id="cb20-2"><a href="#cb20-2" aria-hidden="true" tabindex="-1"></a><span class="ex">081552fa8c0439860aacc658b5c6c05ba6d5c9d92f50e9b6b4d5316eb549da2e</span></span></code></pre></div>
<p>On devrait voir un joli “Hello from Docker” en pointant sur
http://localhost:8080</p>
<h2 id="lier-plusieurs-containers">Lier plusieurs containers</h2>
<p>On va reprendre notre exemple précédent, en ajoutant un container
redis ce qui nous permettra de compter les visites, par exemple.</p>
<p>Nous allons également un peu organiser notre répertoire de travail
comme suit :</p>
<pre><code>monAppDocker
├── .dockerignore
├── Dockerfile
└── src
├── index.js
└── package.json</code></pre>
<h3 id="dockerignore">.dockerignore</h3>
<pre><code>src/node_modules</code></pre>
<h3 id="srcindex.js">src/index.js</h3>
<div class="sourceCode" id="cb23"><pre
class="sourceCode javascript"><code class="sourceCode javascript"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> express <span class="op">=</span> <span class="pp">require</span>(<span class="st">'express'</span>)<span class="op">;</span></span>
<span id="cb23-2"><a href="#cb23-2" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> app <span class="op">=</span> <span class="fu">express</span>()<span class="op">;</span></span>
<span id="cb23-3"><a href="#cb23-3" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> redis <span class="op">=</span> <span class="pp">require</span>(<span class="st">'redis'</span>)<span class="op">;</span></span>
<span id="cb23-4"><a href="#cb23-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb23-5"><a href="#cb23-5" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> client <span class="op">=</span> redis<span class="op">.</span><span class="fu">createClient</span>(<span class="st">'6379'</span><span class="op">,</span> <span class="st">'redis'</span>)<span class="op">;</span></span>
<span id="cb23-6"><a href="#cb23-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb23-7"><a href="#cb23-7" aria-hidden="true" tabindex="-1"></a>app<span class="op">.</span><span class="fu">get</span>(<span class="st">'/'</span><span class="op">,</span> <span class="kw">function</span> (req<span class="op">,</span> res) {</span>
<span id="cb23-8"><a href="#cb23-8" aria-hidden="true" tabindex="-1"></a> client<span class="op">.</span><span class="fu">incr</span>(<span class="st">'counter'</span><span class="op">,</span> <span class="kw">function</span>(err<span class="op">,</span> counter) {</span>
<span id="cb23-9"><a href="#cb23-9" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span>(err) <span class="cf">return</span> <span class="fu">next</span>(err)<span class="op">;</span></span>
<span id="cb23-10"><a href="#cb23-10" aria-hidden="true" tabindex="-1"></a> res<span class="op">.</span><span class="fu">send</span>(<span class="st">'This page has been viewed '</span> <span class="op">+</span> counter <span class="op">+</span> <span class="st">' times!'</span>)<span class="op">;</span></span>
<span id="cb23-11"><a href="#cb23-11" aria-hidden="true" tabindex="-1"></a> })<span class="op">;</span></span>
<span id="cb23-12"><a href="#cb23-12" aria-hidden="true" tabindex="-1"></a>})<span class="op">;</span></span>
<span id="cb23-13"><a href="#cb23-13" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb23-14"><a href="#cb23-14" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> server <span class="op">=</span> app<span class="op">.</span><span class="fu">listen</span>(<span class="dv">8080</span><span class="op">,</span> <span class="kw">function</span> () {</span>
<span id="cb23-15"><a href="#cb23-15" aria-hidden="true" tabindex="-1"></a> <span class="kw">var</span> host <span class="op">=</span> server<span class="op">.</span><span class="fu">address</span>()<span class="op">.</span><span class="at">address</span><span class="op">;</span></span>
<span id="cb23-16"><a href="#cb23-16" aria-hidden="true" tabindex="-1"></a> <span class="kw">var</span> port <span class="op">=</span> server<span class="op">.</span><span class="fu">address</span>()<span class="op">.</span><span class="at">port</span><span class="op">;</span></span>
<span id="cb23-17"><a href="#cb23-17" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb23-18"><a href="#cb23-18" aria-hidden="true" tabindex="-1"></a> <span class="bu">console</span><span class="op">.</span><span class="fu">log</span>(<span class="st">'Example app listening at http://%s:%s'</span><span class="op">,</span> host<span class="op">,</span> port)<span class="op">;</span></span>
<span id="cb23-19"><a href="#cb23-19" aria-hidden="true" tabindex="-1"></a>})<span class="op">;</span></span></code></pre></div>
<h3 id="srcpackage.json">src/package.json</h3>
<div class="sourceCode" id="cb24"><pre
class="sourceCode json"><code class="sourceCode json"><span id="cb24-1"><a href="#cb24-1" aria-hidden="true" tabindex="-1"></a><span class="fu">{</span></span>
<span id="cb24-2"><a href="#cb24-2" aria-hidden="true" tabindex="-1"></a> <span class="dt">"name"</span><span class="fu">:</span> <span class="st">"dockerapp"</span><span class="fu">,</span></span>
<span id="cb24-3"><a href="#cb24-3" aria-hidden="true" tabindex="-1"></a> <span class="dt">"dependencies"</span><span class="fu">:</span> <span class="fu">{</span></span>
<span id="cb24-4"><a href="#cb24-4" aria-hidden="true" tabindex="-1"></a> <span class="dt">"express"</span><span class="fu">:</span> <span class="st">"^4.13.3"</span><span class="fu">,</span></span>
<span id="cb24-5"><a href="#cb24-5" aria-hidden="true" tabindex="-1"></a> <span class="dt">"redis"</span><span class="fu">:</span> <span class="st">"^2.1.0"</span></span>
<span id="cb24-6"><a href="#cb24-6" aria-hidden="true" tabindex="-1"></a> <span class="fu">}</span></span>
<span id="cb24-7"><a href="#cb24-7" aria-hidden="true" tabindex="-1"></a><span class="fu">}</span></span></code></pre></div>
<h3 id="dockerfile">Dockerfile</h3>
<div class="sourceCode" id="cb25"><pre
class="sourceCode dockerfile"><code class="sourceCode dockerfile"><span id="cb25-1"><a href="#cb25-1" aria-hidden="true" tabindex="-1"></a><span class="kw">FROM</span> ubuntu</span>
<span id="cb25-2"><a href="#cb25-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb25-3"><a href="#cb25-3" aria-hidden="true" tabindex="-1"></a><span class="kw">MAINTAINER</span> bobuss</span>
<span id="cb25-4"><a href="#cb25-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb25-5"><a href="#cb25-5" aria-hidden="true" tabindex="-1"></a><span class="kw">RUN</span> <span class="ex">apt-get</span> update <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb25-6"><a href="#cb25-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">apt-get</span> <span class="at">-y</span> install curl <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb25-7"><a href="#cb25-7" aria-hidden="true" tabindex="-1"></a> <span class="ex">apt-get</span> <span class="at">-y</span> install sudo <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb25-8"><a href="#cb25-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">curl</span> <span class="at">-sL</span> https://deb.nodesource.com/setup_6.x <span class="kw">|</span> <span class="fu">sudo</span> bash <span class="at">-</span> <span class="kw">&&</span> <span class="dt">\</span></span>
<span id="cb25-9"><a href="#cb25-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">apt-get</span> <span class="at">-y</span> install python build-essential nodejs</span>
<span id="cb25-10"><a href="#cb25-10" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb25-11"><a href="#cb25-11" aria-hidden="true" tabindex="-1"></a><span class="kw">ADD</span> src /src</span>
<span id="cb25-12"><a href="#cb25-12" aria-hidden="true" tabindex="-1"></a><span class="kw">RUN</span> <span class="bu">cd</span> /src <span class="kw">&&</span> <span class="ex">npm</span> install</span>
<span id="cb25-13"><a href="#cb25-13" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb25-14"><a href="#cb25-14" aria-hidden="true" tabindex="-1"></a><span class="kw">EXPOSE</span> 8080</span>
<span id="cb25-15"><a href="#cb25-15" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb25-16"><a href="#cb25-16" aria-hidden="true" tabindex="-1"></a><span class="kw">CMD</span> [<span class="st">"node"</span>, <span class="st">"/src/index.js"</span>]</span></code></pre></div>
<p>On re-build</p>
<pre><code>$ docker build -t bobuss/node .
...</code></pre>
<p>Pour lancer notre programme, dans un autre terminal, on lance un
container redis :</p>
<div class="sourceCode" id="cb27"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb27-1"><a href="#cb27-1" aria-hidden="true" tabindex="-1"></a><span class="ex">docker</span> run redis</span>
<span id="cb27-2"><a href="#cb27-2" aria-hidden="true" tabindex="-1"></a><span class="ex">1:C</span> 06 Oct 21:39:56.778 <span class="co"># Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf</span></span>
<span id="cb27-3"><a href="#cb27-3" aria-hidden="true" tabindex="-1"></a> <span class="ex">_._</span></span>
<span id="cb27-4"><a href="#cb27-4" aria-hidden="true" tabindex="-1"></a> <span class="ex">_.-</span><span class="kw">``</span>__ <span class="st">''</span>-._</span>
<span id="cb27-5"><a href="#cb27-5" aria-hidden="true" tabindex="-1"></a> <span class="ex">_.-</span><span class="kw">``</span> <span class="kw">`</span><span class="bu">.</span> <span class="kw">`</span>_. <span class="st">''</span>-._ Redis 3.0.3 <span class="er">(</span><span class="ex">00000000/0</span><span class="kw">)</span> <span class="ex">64</span> bit</span>
<span id="cb27-6"><a href="#cb27-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">.-</span><span class="kw">``</span> .-<span class="kw">```</span><span class="bu">.</span> <span class="kw">```</span><span class="dt">\/</span> _.,_ <span class="st">''</span>-._</span>
<span id="cb27-7"><a href="#cb27-7" aria-hidden="true" tabindex="-1"></a> <span class="kw">(</span> <span class="st">' , .-` | `, ) Running in standalone mode</span></span>
<span id="cb27-8"><a href="#cb27-8" aria-hidden="true" tabindex="-1"></a><span class="st"> |`-._`-...-` __...-.``-._|'</span><span class="kw">`</span> <span class="ex">_.-</span><span class="st">'| Port: 6379</span></span>
<span id="cb27-9"><a href="#cb27-9" aria-hidden="true" tabindex="-1"></a><span class="st"> | `-._ `._ / _.-'</span> <span class="kw">|</span> <span class="ex">PID:</span> 1</span>
<span id="cb27-10"><a href="#cb27-10" aria-hidden="true" tabindex="-1"></a> <span class="kw">`</span><span class="at">-._</span> <span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.</span>/ _.-<span class="st">' _.-'</span></span>
<span id="cb27-11"><a href="#cb27-11" aria-hidden="true" tabindex="-1"></a> <span class="kw">|`</span><span class="ex">-._</span><span class="kw">`</span><span class="at">-._</span> <span class="kw">`</span><span class="ex">-.__.-</span><span class="st">' _.-'</span><span class="ex">_.-</span><span class="st">'|</span></span>
<span id="cb27-12"><a href="#cb27-12" aria-hidden="true" tabindex="-1"></a><span class="st"> | `-._`-._ _.-'</span><span class="ex">_.-</span><span class="st">' | http://redis.io</span></span>
<span id="cb27-13"><a href="#cb27-13" aria-hidden="true" tabindex="-1"></a><span class="st"> `-._ `-._`-.__.-'</span><span class="ex">_.-</span><span class="st">' _.-'</span></span>
<span id="cb27-14"><a href="#cb27-14" aria-hidden="true" tabindex="-1"></a> <span class="kw">|`</span><span class="at">-._</span><span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.__.-</span><span class="st">' _.-'</span><span class="at">_.-</span><span class="st">'|</span></span>
<span id="cb27-15"><a href="#cb27-15" aria-hidden="true" tabindex="-1"></a><span class="st"> | `-._`-._ _.-'</span><span class="at">_.-</span><span class="st">' |</span></span>
<span id="cb27-16"><a href="#cb27-16" aria-hidden="true" tabindex="-1"></a><span class="st"> `-._ `-._`-.__.-'</span><span class="at">_.-</span><span class="st">' _.-'</span></span>
<span id="cb27-17"><a href="#cb27-17" aria-hidden="true" tabindex="-1"></a> <span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.__.-</span><span class="st">' _.-'</span></span>
<span id="cb27-18"><a href="#cb27-18" aria-hidden="true" tabindex="-1"></a> <span class="kw">`</span><span class="ex">-._</span> _.-<span class="st">'</span></span>
<span id="cb27-19"><a href="#cb27-19" aria-hidden="true" tabindex="-1"></a><span class="st"> `-.__.-'</span></span>
<span id="cb27-20"><a href="#cb27-20" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb27-21"><a href="#cb27-21" aria-hidden="true" tabindex="-1"></a><span class="ex">1:M</span> 06 Oct 21:39:56.779 <span class="co"># Server started, Redis version 3.0.3</span></span>
<span id="cb27-22"><a href="#cb27-22" aria-hidden="true" tabindex="-1"></a><span class="ex">1:M</span> 06 Oct 21:39:56.779 <span class="co"># </span><span class="al">WARNING</span><span class="co"> overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.</span></span>
<span id="cb27-23"><a href="#cb27-23" aria-hidden="true" tabindex="-1"></a><span class="ex">1:M</span> 06 Oct 21:39:56.779 <span class="co"># </span><span class="al">WARNING</span><span class="co"> you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.</span></span>
<span id="cb27-24"><a href="#cb27-24" aria-hidden="true" tabindex="-1"></a><span class="ex">1:M</span> 06 Oct 21:39:56.779 <span class="co"># </span><span class="al">WARNING</span><span class="co">: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.</span></span>
<span id="cb27-25"><a href="#cb27-25" aria-hidden="true" tabindex="-1"></a><span class="ex">1:M</span> 06 Oct 21:39:56.779 <span class="pp">*</span> The server is now ready to accept connections on port 6379</span></code></pre></div>
<p>Puis on lance notre container avec l’image bobuss/node, en liant le
container redis. C’est l’option <em>link</em> de la commande run. Cette
option donne au container qui se lance les information sur un autre
container. Dans notre exemple, le /etc/hosts du container contiendra une
entrée <em>redis</em> qui pointera sur le host du container redis.</p>
<p>Pour info, l’information est également disponible via variables
d’environnement, pour ceux qui préfèrent.</p>
<div class="sourceCode" id="cb28"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb28-1"><a href="#cb28-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker ps</span>
<span id="cb28-2"><a href="#cb28-2" aria-hidden="true" tabindex="-1"></a><span class="ex">CONTAINER</span> ID IMAGE COMMAND CREATED STATUS PORTS NAMES</span>
<span id="cb28-3"><a href="#cb28-3" aria-hidden="true" tabindex="-1"></a><span class="ex">180b25098d1d</span> redis <span class="st">"/entrypoint.sh redis"</span> 3 seconds ago Up 3 seconds 6379/tcp determined_raman</span>
<span id="cb28-4"><a href="#cb28-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb28-5"><a href="#cb28-5" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker run <span class="at">-d</span> <span class="at">-p</span> 8080:8080 <span class="at">--link</span> determined_raman:redis bobuss/node</span>
<span id="cb28-6"><a href="#cb28-6" aria-hidden="true" tabindex="-1"></a><span class="ex">8cc016d648625e402fef571fc28091a9b12ce15e3aba60528499e5d00e809a60</span></span>
<span id="cb28-7"><a href="#cb28-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb28-8"><a href="#cb28-8" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker ps</span>
<span id="cb28-9"><a href="#cb28-9" aria-hidden="true" tabindex="-1"></a><span class="ex">CONTAINER</span> ID IMAGE COMMAND CREATED STATUS PORTS NAMES</span>
<span id="cb28-10"><a href="#cb28-10" aria-hidden="true" tabindex="-1"></a><span class="ex">8cc016d64862</span> bobuss/node <span class="st">"node /src/index.js"</span> 4 seconds ago Up 3 seconds 0.0.0.0:8080-<span class="op">></span>8080/tcp elated_yonath</span>
<span id="cb28-11"><a href="#cb28-11" aria-hidden="true" tabindex="-1"></a><span class="ex">180b25098d1d</span> redis <span class="st">"/entrypoint.sh redis"</span> 56 seconds ago Up 56 seconds 6379/tcp determined_raman</span></code></pre></div>
<p>On peut aller voir notre oeuvre sur http://localhost:8080</p>
<h2 id="docker-compose">docker-compose</h2>
<p>Docker-Compose (anciennement fig) permet de spécifier comment lancer
plusieurs containers en même temps, et de gérer les <code>link</code>
entre eux.</p>
<p>Une fois installé, on écrit un fichier
<code>docker-compose.yml</code> à la racine de notre projet.</p>
<div class="sourceCode" id="cb29"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb29-1"><a href="#cb29-1" aria-hidden="true" tabindex="-1"></a><span class="fu">web</span><span class="kw">:</span></span>
<span id="cb29-2"><a href="#cb29-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">build</span><span class="kw">:</span><span class="at"> .</span></span>
<span id="cb29-3"><a href="#cb29-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ports</span><span class="kw">:</span></span>
<span id="cb29-4"><a href="#cb29-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">"8080:8080"</span></span>
<span id="cb29-5"><a href="#cb29-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">volumes</span><span class="kw">:</span></span>
<span id="cb29-6"><a href="#cb29-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> ./src:/src</span></span>
<span id="cb29-7"><a href="#cb29-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> /src/node_modules</span></span>
<span id="cb29-8"><a href="#cb29-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">links</span><span class="kw">:</span></span>
<span id="cb29-9"><a href="#cb29-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> redis</span></span>
<span id="cb29-10"><a href="#cb29-10" aria-hidden="true" tabindex="-1"></a><span class="fu">redis</span><span class="kw">:</span></span>
<span id="cb29-11"><a href="#cb29-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">image</span><span class="kw">:</span><span class="at"> redis</span></span></code></pre></div>
<p>Puis</p>
<div class="sourceCode" id="cb30"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb30-1"><a href="#cb30-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker-compose up</span>
<span id="cb30-2"><a href="#cb30-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Warning:</span> the mapping <span class="st">"src:/src"</span> in the volumes config for service <span class="st">"web"</span> is ambiguous. In a future version of Docker, it will designate a <span class="st">"named"</span> volume <span class="er">(</span><span class="ex">see</span> https://github.com/docker/docker/pull/14242<span class="kw">)</span><span class="bu">.</span> To prevent unexpected behaviour, change it to <span class="st">"./src:/src"</span></span>
<span id="cb30-3"><a href="#cb30-3" aria-hidden="true" tabindex="-1"></a><span class="ex">Creating</span> dockerapp_redis_1...</span>
<span id="cb30-4"><a href="#cb30-4" aria-hidden="true" tabindex="-1"></a><span class="ex">Building</span> web...</span>
<span id="cb30-5"><a href="#cb30-5" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 0 : FROM ubuntu</span>
<span id="cb30-6"><a href="#cb30-6" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> 91e54dfb1179</span>
<span id="cb30-7"><a href="#cb30-7" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 1 : MAINTAINER bobuss</span>
<span id="cb30-8"><a href="#cb30-8" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> Using cache</span>
<span id="cb30-9"><a href="#cb30-9" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> 9820e5132a05</span>
<span id="cb30-10"><a href="#cb30-10" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 2 : RUN apt-get update <span class="kw">&&</span> <span class="ex">apt-get</span> <span class="at">-y</span> install curl <span class="kw">&&</span> <span class="ex">curl</span> <span class="at">-sL</span> https://deb.nodesource.com/setup <span class="kw">|</span> <span class="fu">sudo</span> bash <span class="at">-</span> <span class="kw">&&</span> <span class="ex">apt-get</span> <span class="at">-y</span> install python build-essential nodejs</span>
<span id="cb30-11"><a href="#cb30-11" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> Using cache</span>
<span id="cb30-12"><a href="#cb30-12" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> 3a9d1b18bd97</span>
<span id="cb30-13"><a href="#cb30-13" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 3 : ADD src /src</span>
<span id="cb30-14"><a href="#cb30-14" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> 981a2824eda0</span>
<span id="cb30-15"><a href="#cb30-15" aria-hidden="true" tabindex="-1"></a><span class="ex">Removing</span> intermediate container 2eb8518b0f9a</span>
<span id="cb30-16"><a href="#cb30-16" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 4 : RUN cd /src <span class="kw">&&</span> <span class="ex">npm</span> install</span>
<span id="cb30-17"><a href="#cb30-17" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> Running in 1683e1689dc4</span>
<span id="cb30-18"><a href="#cb30-18" aria-hidden="true" tabindex="-1"></a><span class="ex">npm</span> WARN package.json dockerapp@ No description</span>
<span id="cb30-19"><a href="#cb30-19" aria-hidden="true" tabindex="-1"></a><span class="ex">npm</span> WARN package.json dockerapp@ No repository field.</span>
<span id="cb30-20"><a href="#cb30-20" aria-hidden="true" tabindex="-1"></a><span class="ex">npm</span> WARN package.json dockerapp@ No README data</span>
<span id="cb30-21"><a href="#cb30-21" aria-hidden="true" tabindex="-1"></a><span class="ex">[email protected]</span> node_modules/redis</span>
<span id="cb30-22"><a href="#cb30-22" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb30-23"><a href="#cb30-23" aria-hidden="true" tabindex="-1"></a><span class="ex">[email protected]</span> node_modules/express</span>
<span id="cb30-24"><a href="#cb30-24" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-25"><a href="#cb30-25" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-26"><a href="#cb30-26" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-27"><a href="#cb30-27" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-28"><a href="#cb30-28" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-29"><a href="#cb30-29" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-30"><a href="#cb30-30" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-31"><a href="#cb30-31" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-32"><a href="#cb30-32" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-33"><a href="#cb30-33" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-34"><a href="#cb30-34" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-35"><a href="#cb30-35" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-36"><a href="#cb30-36" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-37"><a href="#cb30-37" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-38"><a href="#cb30-38" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-39"><a href="#cb30-39" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-40"><a href="#cb30-40" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-41"><a href="#cb30-41" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected]</span>
<span id="cb30-42"><a href="#cb30-42" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected] <span class="er">(</span><span class="ex">[email protected]</span><span class="kw">)</span></span>
<span id="cb30-43"><a href="#cb30-43" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected] <span class="er">(</span><span class="ex">[email protected],</span> [email protected]<span class="kw">)</span></span>
<span id="cb30-44"><a href="#cb30-44" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected] <span class="er">(</span><span class="ex">[email protected]</span><span class="kw">)</span></span>
<span id="cb30-45"><a href="#cb30-45" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected] <span class="er">(</span><span class="ex">[email protected]</span><span class="kw">)</span></span>
<span id="cb30-46"><a href="#cb30-46" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected] <span class="er">(</span><span class="ex">[email protected],</span> [email protected], [email protected], [email protected], [email protected]<span class="kw">)</span></span>
<span id="cb30-47"><a href="#cb30-47" aria-hidden="true" tabindex="-1"></a><span class="ex">├──</span> [email protected] <span class="er">(</span><span class="ex">[email protected],</span> [email protected]<span class="kw">)</span></span>
<span id="cb30-48"><a href="#cb30-48" aria-hidden="true" tabindex="-1"></a><span class="ex">└──</span> [email protected] <span class="er">(</span><span class="ex">[email protected],</span> [email protected]<span class="kw">)</span></span>
<span id="cb30-49"><a href="#cb30-49" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> 6cb839ba2a27</span>
<span id="cb30-50"><a href="#cb30-50" aria-hidden="true" tabindex="-1"></a><span class="ex">Removing</span> intermediate container 1683e1689dc4</span>
<span id="cb30-51"><a href="#cb30-51" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 5 : EXPOSE 8080</span>
<span id="cb30-52"><a href="#cb30-52" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> Running in 6697ae23540a</span>
<span id="cb30-53"><a href="#cb30-53" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> eb3e96f0a207</span>
<span id="cb30-54"><a href="#cb30-54" aria-hidden="true" tabindex="-1"></a><span class="ex">Removing</span> intermediate container 6697ae23540a</span>
<span id="cb30-55"><a href="#cb30-55" aria-hidden="true" tabindex="-1"></a><span class="ex">Step</span> 6 : CMD node /src/index.js</span>
<span id="cb30-56"><a href="#cb30-56" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> Running in a7d71607421f</span>
<span id="cb30-57"><a href="#cb30-57" aria-hidden="true" tabindex="-1"></a> <span class="ex">---</span><span class="op">></span> f2679c36d047</span>
<span id="cb30-58"><a href="#cb30-58" aria-hidden="true" tabindex="-1"></a><span class="ex">Removing</span> intermediate container a7d71607421f</span>
<span id="cb30-59"><a href="#cb30-59" aria-hidden="true" tabindex="-1"></a><span class="ex">Successfully</span> built f2679c36d047</span>
<span id="cb30-60"><a href="#cb30-60" aria-hidden="true" tabindex="-1"></a><span class="ex">Creating</span> dockerapp_web_1...</span>
<span id="cb30-61"><a href="#cb30-61" aria-hidden="true" tabindex="-1"></a><span class="ex">Attaching</span> to dockerapp_redis_1, dockerapp_web_1</span>
<span id="cb30-62"><a href="#cb30-62" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:C</span> 06 Oct 21:18:31.659 <span class="co"># Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf</span></span>
<span id="cb30-63"><a href="#cb30-63" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">_._</span></span>
<span id="cb30-64"><a href="#cb30-64" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">_.-</span><span class="kw">``</span>__ <span class="st">''</span>-._</span>
<span id="cb30-65"><a href="#cb30-65" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">_.-</span><span class="kw">``</span> <span class="kw">`</span><span class="bu">.</span> <span class="kw">`</span>_. <span class="st">''</span>-._ Redis 3.0.3 <span class="er">(</span><span class="ex">00000000/0</span><span class="kw">)</span> <span class="ex">64</span> bit</span>
<span id="cb30-66"><a href="#cb30-66" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">.-</span><span class="kw">``</span> .-<span class="kw">```</span><span class="bu">.</span> <span class="kw">```</span><span class="dt">\/</span> _.,_ <span class="st">''</span>-._</span>
<span id="cb30-67"><a href="#cb30-67" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">(</span> <span class="st">' , .-` | `, ) Running in standalone mode</span></span>
<span id="cb30-68"><a href="#cb30-68" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | |`-._`-...-` __...-.``-._|'</span><span class="kw">`</span> <span class="ex">_.-</span><span class="st">'| Port: 6379</span></span>
<span id="cb30-69"><a href="#cb30-69" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | | `-._ `._ / _.-'</span> <span class="kw">|</span> <span class="ex">PID:</span> 1</span>
<span id="cb30-70"><a href="#cb30-70" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">`</span><span class="at">-._</span> <span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.</span>/ _.-<span class="st">' _.-'</span></span>
<span id="cb30-71"><a href="#cb30-71" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">|`</span><span class="ex">-._</span><span class="kw">`</span><span class="at">-._</span> <span class="kw">`</span><span class="ex">-.__.-</span><span class="st">' _.-'</span><span class="ex">_.-</span><span class="st">'|</span></span>
<span id="cb30-72"><a href="#cb30-72" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | | `-._`-._ _.-'</span><span class="ex">_.-</span><span class="st">' | http://redis.io</span></span>
<span id="cb30-73"><a href="#cb30-73" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | `-._ `-._`-.__.-'</span><span class="ex">_.-</span><span class="st">' _.-'</span></span>
<span id="cb30-74"><a href="#cb30-74" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">|`</span><span class="at">-._</span><span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.__.-</span><span class="st">' _.-'</span><span class="at">_.-</span><span class="st">'|</span></span>
<span id="cb30-75"><a href="#cb30-75" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | | `-._`-._ _.-'</span><span class="at">_.-</span><span class="st">' |</span></span>
<span id="cb30-76"><a href="#cb30-76" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | `-._ `-._`-.__.-'</span><span class="at">_.-</span><span class="st">' _.-'</span></span>
<span id="cb30-77"><a href="#cb30-77" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.__.-</span><span class="st">' _.-'</span></span>
<span id="cb30-78"><a href="#cb30-78" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">`</span><span class="ex">-._</span> _.-<span class="st">'</span></span>
<span id="cb30-79"><a href="#cb30-79" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | `-.__.-'</span></span>
<span id="cb30-80"><a href="#cb30-80" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span></span>
<span id="cb30-81"><a href="#cb30-81" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 06 Oct 21:18:31.661 <span class="co"># Server started, Redis version 3.0.3</span></span>
<span id="cb30-82"><a href="#cb30-82" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 06 Oct 21:18:31.661 <span class="co"># </span><span class="al">WARNING</span><span class="co"> overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.</span></span>
<span id="cb30-83"><a href="#cb30-83" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 06 Oct 21:18:31.661 <span class="co"># </span><span class="al">WARNING</span><span class="co"> you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.</span></span>
<span id="cb30-84"><a href="#cb30-84" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 06 Oct 21:18:31.661 <span class="co"># </span><span class="al">WARNING</span><span class="co">: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.</span></span>
<span id="cb30-85"><a href="#cb30-85" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 06 Oct 21:18:31.661 <span class="pp">*</span> The server is now ready to accept connections on port 6379</span>
<span id="cb30-86"><a href="#cb30-86" aria-hidden="true" tabindex="-1"></a><span class="ex">web_1</span> <span class="kw">|</span> <span class="ex">Example</span> app listening at http://0.0.0.0:8080</span>
<span id="cb30-87"><a href="#cb30-87" aria-hidden="true" tabindex="-1"></a><span class="ex">^CGracefully</span> stopping... <span class="er">(</span><span class="ex">press</span> Ctrl+C again to force<span class="kw">)</span></span>
<span id="cb30-88"><a href="#cb30-88" aria-hidden="true" tabindex="-1"></a><span class="ex">Stopping</span> dockerapp_web_1... done</span>
<span id="cb30-89"><a href="#cb30-89" aria-hidden="true" tabindex="-1"></a><span class="ex">Stopping</span> dockerapp_redis_1... done</span></code></pre></div>
<h2 id="les-données-dans-docker">Les données dans docker</h2>
<p>Pour l’instant, à chaque fois que l’on lance
<code>docker-compose up</code>, notre stack repart de 0. Ce qui n’est
pas très pratique. Une facon de traiter de données persistentes avec
docker, consiste à utiliser les volumes.</p>
<p>Concernant redis, il faut tout d’abord activer la persistence. Le
service doit être lancé avec l’option <code>--appendonly yes</code>.</p>
<p>En ligne de commande cela donnerait</p>
<div class="sourceCode" id="cb31"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb31-1"><a href="#cb31-1" aria-hidden="true" tabindex="-1"></a><span class="ex">docker</span> run redis redis-server <span class="at">--appendonly</span> yes</span></code></pre></div>
<p>De plus, on peut spécifier vers quel stockage on lie un volume du
container. Pour le service redis, quand la persistence est activée, les
données sont écrites dans le répertoire <code>/data</code>. On se crée
donc un repertoire <code>data</code>dans notre projet.</p>
<div class="sourceCode" id="cb32"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb32-1"><a href="#cb32-1" aria-hidden="true" tabindex="-1"></a><span class="fu">mkdir</span> data</span></code></pre></div>
<p>Ce qui donne comme structure :</p>
<pre><code>monAppDocker
├── .dockerignore
├── Dockerfile
├── data
└── src
├── index.js
└── package.json</code></pre>
<p>On peut maintenant lancer un service redis qui gardera les
modifications.</p>
<div class="sourceCode" id="cb34"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb34-1"><a href="#cb34-1" aria-hidden="true" tabindex="-1"></a><span class="ex">docker</span> run <span class="at">-v</span> data:/data redis redis-server <span class="at">--appendonly</span> yes</span></code></pre></div>
<p>Je vous laisse vous convaincre que cela fonctionne en relançant
l’application dans un autre terminal…</p>
<p>Et si on applique toutes ces modifications dans le
<code>docker-compose.yml</code>, cela nous donne :</p>
<div class="sourceCode" id="cb35"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb35-1"><a href="#cb35-1" aria-hidden="true" tabindex="-1"></a><span class="fu">web</span><span class="kw">:</span></span>
<span id="cb35-2"><a href="#cb35-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">build</span><span class="kw">:</span><span class="at"> .</span></span>
<span id="cb35-3"><a href="#cb35-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ports</span><span class="kw">:</span></span>
<span id="cb35-4"><a href="#cb35-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">"8080:8080"</span></span>
<span id="cb35-5"><a href="#cb35-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">volumes</span><span class="kw">:</span></span>
<span id="cb35-6"><a href="#cb35-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> ./src:/src</span></span>
<span id="cb35-7"><a href="#cb35-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> /src/node_modules</span></span>
<span id="cb35-8"><a href="#cb35-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">links</span><span class="kw">:</span></span>
<span id="cb35-9"><a href="#cb35-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> redis</span></span>
<span id="cb35-10"><a href="#cb35-10" aria-hidden="true" tabindex="-1"></a><span class="fu">redis</span><span class="kw">:</span></span>
<span id="cb35-11"><a href="#cb35-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">image</span><span class="kw">:</span><span class="at"> redis</span></span>
<span id="cb35-12"><a href="#cb35-12" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">command</span><span class="kw">:</span><span class="at"> redis-server --appendonly yes</span></span>
<span id="cb35-13"><a href="#cb35-13" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">volumes</span><span class="kw">:</span></span>
<span id="cb35-14"><a href="#cb35-14" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> ./data:/data</span></span></code></pre></div>
<p>On relance le tout …</p>
<div class="sourceCode" id="cb36"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb36-1"><a href="#cb36-1" aria-hidden="true" tabindex="-1"></a><span class="ex">docker-compose</span> up</span>
<span id="cb36-2"><a href="#cb36-2" aria-hidden="true" tabindex="-1"></a><span class="ex">Starting</span> project_redis_1</span>
<span id="cb36-3"><a href="#cb36-3" aria-hidden="true" tabindex="-1"></a><span class="ex">Starting</span> project_web_1</span>
<span id="cb36-4"><a href="#cb36-4" aria-hidden="true" tabindex="-1"></a><span class="ex">Attaching</span> to project_redis_1, project_web_1</span>
<span id="cb36-5"><a href="#cb36-5" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">_._</span></span>
<span id="cb36-6"><a href="#cb36-6" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">_.-</span><span class="kw">``</span>__ <span class="st">''</span>-._</span>
<span id="cb36-7"><a href="#cb36-7" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">_.-</span><span class="kw">``</span> <span class="kw">`</span><span class="bu">.</span> <span class="kw">`</span>_. <span class="st">''</span>-._ Redis 3.2.1 <span class="er">(</span><span class="ex">00000000/0</span><span class="kw">)</span> <span class="ex">64</span> bit</span>
<span id="cb36-8"><a href="#cb36-8" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">.-</span><span class="kw">``</span> .-<span class="kw">```</span><span class="bu">.</span> <span class="kw">```</span><span class="dt">\/</span> _.,_ <span class="st">''</span>-._</span>
<span id="cb36-9"><a href="#cb36-9" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">(</span> <span class="st">' , .-` | `, ) Running in standalone mode</span></span>
<span id="cb36-10"><a href="#cb36-10" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | |`-._`-...-` __...-.``-._|'</span><span class="kw">`</span> <span class="ex">_.-</span><span class="st">'| Port: 6379</span></span>
<span id="cb36-11"><a href="#cb36-11" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | | `-._ `._ / _.-'</span> <span class="kw">|</span> <span class="ex">PID:</span> 1</span>
<span id="cb36-12"><a href="#cb36-12" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">`</span><span class="at">-._</span> <span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.</span>/ _.-<span class="st">' _.-'</span></span>
<span id="cb36-13"><a href="#cb36-13" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">|`</span><span class="ex">-._</span><span class="kw">`</span><span class="at">-._</span> <span class="kw">`</span><span class="ex">-.__.-</span><span class="st">' _.-'</span><span class="ex">_.-</span><span class="st">'|</span></span>
<span id="cb36-14"><a href="#cb36-14" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | | `-._`-._ _.-'</span><span class="ex">_.-</span><span class="st">' | http://redis.io</span></span>
<span id="cb36-15"><a href="#cb36-15" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | `-._ `-._`-.__.-'</span><span class="ex">_.-</span><span class="st">' _.-'</span></span>
<span id="cb36-16"><a href="#cb36-16" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">|`</span><span class="at">-._</span><span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.__.-</span><span class="st">' _.-'</span><span class="at">_.-</span><span class="st">'|</span></span>
<span id="cb36-17"><a href="#cb36-17" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | | `-._`-._ _.-'</span><span class="at">_.-</span><span class="st">' |</span></span>
<span id="cb36-18"><a href="#cb36-18" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | `-._ `-._`-.__.-'</span><span class="at">_.-</span><span class="st">' _.-'</span></span>
<span id="cb36-19"><a href="#cb36-19" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">`</span><span class="ex">-._</span> <span class="kw">`</span><span class="at">-.__.-</span><span class="st">' _.-'</span></span>
<span id="cb36-20"><a href="#cb36-20" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="kw">`</span><span class="ex">-._</span> _.-<span class="st">'</span></span>
<span id="cb36-21"><a href="#cb36-21" aria-hidden="true" tabindex="-1"></a><span class="st">redis_1 | `-.__.-'</span></span>
<span id="cb36-22"><a href="#cb36-22" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span></span>
<span id="cb36-23"><a href="#cb36-23" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 14 Nov 18:31:57.351 <span class="co"># </span><span class="al">WARNING</span><span class="co">: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.</span></span>
<span id="cb36-24"><a href="#cb36-24" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 14 Nov 18:31:57.352 <span class="co"># Server started, Redis version 3.2.1</span></span>
<span id="cb36-25"><a href="#cb36-25" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 14 Nov 18:31:57.352 <span class="co"># </span><span class="al">WARNING</span><span class="co"> overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.</span></span>
<span id="cb36-26"><a href="#cb36-26" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 14 Nov 18:31:57.353 <span class="co"># </span><span class="al">WARNING</span><span class="co"> you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.</span></span>
<span id="cb36-27"><a href="#cb36-27" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 14 Nov 18:31:57.358 <span class="pp">*</span> DB loaded from append only file: 0.005 seconds</span>
<span id="cb36-28"><a href="#cb36-28" aria-hidden="true" tabindex="-1"></a><span class="ex">redis_1</span> <span class="kw">|</span> <span class="ex">1:M</span> 14 Nov 18:31:57.358 <span class="pp">*</span> The server is now ready to accept connections on port 6379</span>
<span id="cb36-29"><a href="#cb36-29" aria-hidden="true" tabindex="-1"></a><span class="ex">web_1</span> <span class="kw">|</span> <span class="ex">Example</span> app listening at http://:::8080</span></code></pre></div>
<p>On va sur http://localhost:8080 pour faire monter le compteur. Et que
voit-on dans le répertoire <code>data</code> ?</p>
<div class="sourceCode" id="cb37"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb37-1"><a href="#cb37-1" aria-hidden="true" tabindex="-1"></a><span class="fu">tail</span> <span class="at">-f</span> data/appendonly.aof</span>
<span id="cb37-2"><a href="#cb37-2" aria-hidden="true" tabindex="-1"></a><span class="ex">2</span></span>
<span id="cb37-3"><a href="#cb37-3" aria-hidden="true" tabindex="-1"></a><span class="va">$6</span></span>
<span id="cb37-4"><a href="#cb37-4" aria-hidden="true" tabindex="-1"></a><span class="ex">SELECT</span></span>
<span id="cb37-5"><a href="#cb37-5" aria-hidden="true" tabindex="-1"></a><span class="va">$1</span></span>
<span id="cb37-6"><a href="#cb37-6" aria-hidden="true" tabindex="-1"></a><span class="ex">0</span></span>
<span id="cb37-7"><a href="#cb37-7" aria-hidden="true" tabindex="-1"></a><span class="ex">*3</span></span>
<span id="cb37-8"><a href="#cb37-8" aria-hidden="true" tabindex="-1"></a><span class="va">$3</span></span>
<span id="cb37-9"><a href="#cb37-9" aria-hidden="true" tabindex="-1"></a><span class="bu">set</span></span>
<span id="cb37-10"><a href="#cb37-10" aria-hidden="true" tabindex="-1"></a><span class="va">$2</span></span>
<span id="cb37-11"><a href="#cb37-11" aria-hidden="true" tabindex="-1"></a><span class="ex">un</span></span>
<span id="cb37-12"><a href="#cb37-12" aria-hidden="true" tabindex="-1"></a><span class="va">$4</span></span>
<span id="cb37-13"><a href="#cb37-13" aria-hidden="true" tabindex="-1"></a><span class="ex">duex</span></span>
<span id="cb37-14"><a href="#cb37-14" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-15"><a href="#cb37-15" aria-hidden="true" tabindex="-1"></a><span class="va">$6</span></span>
<span id="cb37-16"><a href="#cb37-16" aria-hidden="true" tabindex="-1"></a><span class="ex">SELECT</span></span>
<span id="cb37-17"><a href="#cb37-17" aria-hidden="true" tabindex="-1"></a><span class="va">$1</span></span>
<span id="cb37-18"><a href="#cb37-18" aria-hidden="true" tabindex="-1"></a><span class="ex">0</span></span>
<span id="cb37-19"><a href="#cb37-19" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-20"><a href="#cb37-20" aria-hidden="true" tabindex="-1"></a><span class="va">$4</span></span>
<span id="cb37-21"><a href="#cb37-21" aria-hidden="true" tabindex="-1"></a><span class="ex">incr</span></span>
<span id="cb37-22"><a href="#cb37-22" aria-hidden="true" tabindex="-1"></a><span class="va">$7</span></span>
<span id="cb37-23"><a href="#cb37-23" aria-hidden="true" tabindex="-1"></a><span class="ex">counter</span></span>
<span id="cb37-24"><a href="#cb37-24" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-25"><a href="#cb37-25" aria-hidden="true" tabindex="-1"></a><span class="va">$4</span></span>
<span id="cb37-26"><a href="#cb37-26" aria-hidden="true" tabindex="-1"></a><span class="ex">incr</span></span>
<span id="cb37-27"><a href="#cb37-27" aria-hidden="true" tabindex="-1"></a><span class="va">$7</span></span>
<span id="cb37-28"><a href="#cb37-28" aria-hidden="true" tabindex="-1"></a><span class="ex">counter</span></span>
<span id="cb37-29"><a href="#cb37-29" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-30"><a href="#cb37-30" aria-hidden="true" tabindex="-1"></a><span class="va">$4</span></span>
<span id="cb37-31"><a href="#cb37-31" aria-hidden="true" tabindex="-1"></a><span class="ex">incr</span></span>
<span id="cb37-32"><a href="#cb37-32" aria-hidden="true" tabindex="-1"></a><span class="va">$7</span></span>
<span id="cb37-33"><a href="#cb37-33" aria-hidden="true" tabindex="-1"></a><span class="ex">counter</span></span>
<span id="cb37-34"><a href="#cb37-34" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-35"><a href="#cb37-35" aria-hidden="true" tabindex="-1"></a><span class="va">$6</span></span>
<span id="cb37-36"><a href="#cb37-36" aria-hidden="true" tabindex="-1"></a><span class="ex">SELECT</span></span>
<span id="cb37-37"><a href="#cb37-37" aria-hidden="true" tabindex="-1"></a><span class="va">$1</span></span>
<span id="cb37-38"><a href="#cb37-38" aria-hidden="true" tabindex="-1"></a><span class="ex">0</span></span>
<span id="cb37-39"><a href="#cb37-39" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-40"><a href="#cb37-40" aria-hidden="true" tabindex="-1"></a><span class="va">$4</span></span>
<span id="cb37-41"><a href="#cb37-41" aria-hidden="true" tabindex="-1"></a><span class="ex">incr</span></span>
<span id="cb37-42"><a href="#cb37-42" aria-hidden="true" tabindex="-1"></a><span class="va">$7</span></span>
<span id="cb37-43"><a href="#cb37-43" aria-hidden="true" tabindex="-1"></a><span class="ex">counter</span></span>
<span id="cb37-44"><a href="#cb37-44" aria-hidden="true" tabindex="-1"></a><span class="ex">*2</span></span>
<span id="cb37-45"><a href="#cb37-45" aria-hidden="true" tabindex="-1"></a><span class="va">$4</span></span>
<span id="cb37-46"><a href="#cb37-46" aria-hidden="true" tabindex="-1"></a><span class="ex">incr</span></span>
<span id="cb37-47"><a href="#cb37-47" aria-hidden="true" tabindex="-1"></a><span class="va">$7</span></span>
<span id="cb37-48"><a href="#cb37-48" aria-hidden="true" tabindex="-1"></a><span class="ex">counter</span></span></code></pre></div>
<p>Et voilà / (Salut tintin). On peut passer à l’étape suivante, et se
diriger vers l’informatique dans les nuages.</p>
<h2 id="docker-machine">Docker Machine</h2>
<p>aka déploiement sur EC2 via la machinerie docker.</p>
<p>Inconvénient, docker-machine provisionne une instance, et permet de
configurer le client local pour adresser un docker sur cette instance.
Pour adresser plusieurs instances, il faut se tourner vers
<code>docker-swarm</code>.</p>
<p>Pour tester, une fois installé, pour provisionner une instance
VirutalBox en local, et une isntance sur EC2, chacune avec docker de
préinstallé, on fait (Attention au nommage de l’instance dans EC2)</p>
<div class="sourceCode" id="cb38"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb38-1"><a href="#cb38-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker-machine create <span class="at">--driver</span> virtualbox <span class="dt">\</span></span>
<span id="cb38-2"><a href="#cb38-2" aria-hidden="true" tabindex="-1"></a>--virtualbox-memory 1024 dev<span class="kw">;</span></span>
<span id="cb38-3"><a href="#cb38-3" aria-hidden="true" tabindex="-1"></a><span class="ex">No</span> default boot2docker iso found locally, downloading the latest release...</span>
<span id="cb38-4"><a href="#cb38-4" aria-hidden="true" tabindex="-1"></a><span class="ex">Downloading</span> https://github.com/boot2docker/boot2docker/releases/download/v1.8.2/boot2docker.iso to /home/bobuss/.docker/machine/cache/boot2docker.iso...</span>
<span id="cb38-5"><a href="#cb38-5" aria-hidden="true" tabindex="-1"></a><span class="ex">Creating</span> VirtualBox VM...</span>
<span id="cb38-6"><a href="#cb38-6" aria-hidden="true" tabindex="-1"></a><span class="ex">Creating</span> SSH key...</span>
<span id="cb38-7"><a href="#cb38-7" aria-hidden="true" tabindex="-1"></a><span class="ex">Starting</span> VirtualBox VM...</span>
<span id="cb38-8"><a href="#cb38-8" aria-hidden="true" tabindex="-1"></a><span class="ex">Starting</span> VM...</span>
<span id="cb38-9"><a href="#cb38-9" aria-hidden="true" tabindex="-1"></a><span class="ex">To</span> see how to connect Docker to this machine, run: docker-machine env dev</span>
<span id="cb38-10"><a href="#cb38-10" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb38-11"><a href="#cb38-11" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb38-12"><a href="#cb38-12" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker-machine create <span class="dt">\</span></span>
<span id="cb38-13"><a href="#cb38-13" aria-hidden="true" tabindex="-1"></a>--driver amazonec2 <span class="dt">\</span></span>
<span id="cb38-14"><a href="#cb38-14" aria-hidden="true" tabindex="-1"></a>--amazonec2-access-key your-aws-access-key <span class="dt">\</span></span>
<span id="cb38-15"><a href="#cb38-15" aria-hidden="true" tabindex="-1"></a>--amazonec2-secret-key your-aws-secret-key <span class="dt">\</span></span>
<span id="cb38-16"><a href="#cb38-16" aria-hidden="true" tabindex="-1"></a>--amazonec2-vpc-id your-aws-vpc-id <span class="dt">\</span></span>
<span id="cb38-17"><a href="#cb38-17" aria-hidden="true" tabindex="-1"></a>--amazonec2-subnet-id your-aws-subnet-id <span class="dt">\</span></span>
<span id="cb38-18"><a href="#cb38-18" aria-hidden="true" tabindex="-1"></a>--amazonec2-region us-east-1 <span class="dt">\</span></span>
<span id="cb38-19"><a href="#cb38-19" aria-hidden="true" tabindex="-1"></a>--amazonec2-zone a <span class="dt">\</span></span>
<span id="cb38-20"><a href="#cb38-20" aria-hidden="true" tabindex="-1"></a>ec2box_bobuss</span>
<span id="cb38-21"><a href="#cb38-21" aria-hidden="true" tabindex="-1"></a><span class="ex">Launching</span> instance...</span>
<span id="cb38-22"><a href="#cb38-22" aria-hidden="true" tabindex="-1"></a><span class="ex">To</span> see how to connect Docker to this machine, run: docker-machine env ec2box_bobuss</span>
<span id="cb38-23"><a href="#cb38-23" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb38-24"><a href="#cb38-24" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> docker-machine ls</span>
<span id="cb38-25"><a href="#cb38-25" aria-hidden="true" tabindex="-1"></a><span class="ex">NAME</span> ACTIVE DRIVER STATE URL SWARM</span>
<span id="cb38-26"><a href="#cb38-26" aria-hidden="true" tabindex="-1"></a><span class="ex">dev</span> virtualbox Running tcp://192.168.99.100:2376</span>
<span id="cb38-27"><a href="#cb38-27" aria-hidden="true" tabindex="-1"></a><span class="ex">ec2box_bobuss</span> amazonec2 Running tcp://54.85.61.184:2376</span></code></pre></div>
<p>La commande <code>docker-machine env XXXX</code> exporte dans les
variable d’environnement de docker la configuration de l’instance
demandée.</p>
<p>Par exemple, pour configurer son client docker pour utiliser l’hôte
virtualbox, on execute</p>
<div class="sourceCode" id="cb39"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb39-1"><a href="#cb39-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> eval <span class="st">"</span><span class="va">$(</span><span class="ex">docker-machine</span> env dev<span class="va">)</span><span class="st">"</span></span></code></pre></div>
<p>Maintenant, toute commande docker adressera le docker hébergé sur le
VirtualBox en local.</p>
<p>De manière symétrique, pour adresser le docker hebergé sur EC2 :</p>
<div class="sourceCode" id="cb40"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb40-1"><a href="#cb40-1" aria-hidden="true" tabindex="-1"></a><span class="ex">$</span> eval <span class="st">"</span><span class="va">$(</span><span class="ex">docker-machine</span> env ec2box_bobuss<span class="va">)</span><span class="st">"</span></span></code></pre></div>
<p>Et ainsi, toute commande docker s’adressera au docker hébergé sur
l’instance EC2.</p>
<p>Enfin, pour retrouver le paramétrage de notre docker local,</p>
<pre><code>$ eval "$(docker-machine env -u)"</code></pre>
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<h4 id="licence">Licence</h4>
<p>Cette œuvre est mise à disposition selon les termes de la Licence <a
href="https://creativecommons.org/licenses/by/3.0/fr/">Creative Commons
Attribution 3.0 France</a>.</p>
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