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<!doctype html><html lang="en" class="no-js"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><meta http-equiv="x-ua-compatible" content="ie=edge"><link rel="canonical" href="http://containrrr.github.io/watchtower/introduction/"><meta name="lang:clipboard.copy" content="Copy to clipboard"><meta name="lang:clipboard.copied" content="Copied to clipboard"><meta name="lang:search.language" content="en"><meta name="lang:search.pipeline.stopwords" content="True"><meta name="lang:search.pipeline.trimmer" content="True"><meta name="lang:search.result.none" content="No matching documents"><meta name="lang:search.result.one" content="1 matching document"><meta name="lang:search.result.other" content="# matching documents"><meta name="lang:search.tokenizer" content="[\s\-]+"><link rel="shortcut icon" href="../assets/images/favicon.png"><meta name="generator" content="mkdocs-1.0.4, mkdocs-material-4.3.1"><title>Introduction - Watchtower</title><link rel="stylesheet" href="../assets/stylesheets/application.4031d38b.css"><script src="../assets/javascripts/modernizr.74668098.js"></script><link href="https://fonts.gstatic.com" rel="preconnect" crossorigin><link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700|Roboto+Mono&display=swap"><style>body,input{font-family:"Roboto","Helvetica Neue",Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono","Courier New",Courier,monospace}</style><link rel="stylesheet" href="../assets/fonts/material-icons.css"></head><body dir="ltr"><svg class="md-svg"><defs><svg xmlns="http://www.w3.org/2000/svg" width="416" height="448" viewBox="0 0 416 448" id="__github"><path fill="currentColor" d="M160 304q0 10-3.125 20.5t-10.75 19T128 352t-18.125-8.5-10.75-19T96 304t3.125-20.5 10.75-19T128 256t18.125 8.5 10.75 19T160 304zm160 0q0 10-3.125 20.5t-10.75 19T288 352t-18.125-8.5-10.75-19T256 304t3.125-20.5 10.75-19T288 256t18.125 8.5 10.75 19T320 304zm40 0q0-30-17.25-51T296 232q-10.25 0-48.75 5.25Q229.5 240 208 240t-39.25-2.75Q130.75 232 120 232q-29.5 0-46.75 21T56 304q0 22 8 38.375t20.25 25.75 30.5 15 35 7.375 37.25 1.75h42q20.5 0 37.25-1.75t35-7.375 30.5-15 20.25-25.75T360 304zm56-44q0 51.75-15.25 82.75-9.5 19.25-26.375 33.25t-35.25 21.5-42.5 11.875-42.875 5.5T212 416q-19.5 0-35.5-.75t-36.875-3.125-38.125-7.5-34.25-12.875T37 371.5t-21.5-28.75Q0 312 0 260q0-59.25 34-99-6.75-20.5-6.75-42.5 0-29 12.75-54.5 27 0 47.5 9.875t47.25 30.875Q171.5 96 212 96q37 0 70 8 26.25-20.5 46.75-30.25T376 64q12.75 25.5 12.75 54.5 0 21.75-6.75 42 34 40 34 99.5z"/></svg></defs></svg> <input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off"> <input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off"> <label class="md-overlay" data-md-component="overlay" for="__drawer"></label><header class="md-header" data-md-component="header"><nav class="md-header-nav md-grid"><div class="md-flex"><div class="md-flex__cell md-flex__cell--shrink"><a href="http://containrrr.github.io/watchtower/" title="Watchtower" class="md-header-nav__button md-logo"><i class="md-icon"></i></a></div><div class="md-flex__cell md-flex__cell--shrink"><label class="md-icon md-icon--menu md-header-nav__button" for="__drawer"></label></div><div class="md-flex__cell md-flex__cell--stretch"><div class="md-flex__ellipsis md-header-nav__title" data-md-component="title"><span class="md-header-nav__topic">Watchtower</span><span class="md-header-nav__topic">Introduction</span></div></div><div class="md-flex__cell md-flex__cell--shrink"><label class="md-icon md-icon--search md-header-nav__button" for="__search"></label><div class="md-search" data-md-component="search" role="dialog"><label class="md-search__overlay" for="__search"></label><div class="md-search__inner" role="search"><form class="md-search__form" name="search"><input type="text" class="md-search__input" name="query" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query" data-md
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<p>With watchtower you can update the running version of your containerized app simply by pushing a new image to the Docker Hub or your own image registry. Watchtower will pull down your new image, gracefully shut down your existing container and restart it with the same options that were used when it was deployed initially.</p>
<p>For example, let's say you were running watchtower along with an instance of <em>centurylink/wetty-cli</em> image:</p>
<pre><code class="bash">$ docker ps
CONTAINER ID IMAGE STATUS PORTS NAMES
967848166a45 centurylink/wetty-cli Up 10 minutes 0.0.0.0:8080-&gt;3000/tcp wetty
6cc4d2a9d1a5 containrrr/watchtower Up 15 minutes watchtower
</code></pre>
<p>Every few minutes watchtower will pull the latest <em>centurylink/wetty-cli</em> image and compare it to the one that was used to run the "wetty" container. If it sees that the image has changed it will stop/remove the "wetty" container and then restart it using the new image and the same <code>docker run</code> options that were used to start the container initially (in this case, that would include the <code>-p 8080:3000</code> port mapping).</p></article></div></div></main><footer class="md-footer"><div class="md-footer-nav"><nav class="md-footer-nav__inner md-grid"><a href=".." title="Home" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev"><div class="md-flex__cell md-flex__cell--shrink"><i class="md-icon md-icon--arrow-back md-footer-nav__button"></i></div><div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"><span class="md-flex__ellipsis"><span class="md-footer-nav__direction">Previous</span>Home</span></div></a><a href="../usage-overview/" title="Usage overview" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next"><div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"><span class="md-flex__ellipsis"><span class="md-footer-nav__direction">Next</span>Usage overview</span></div><div class="md-flex__cell md-flex__cell--shrink"><i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i></div></a></nav></div><div class="md-footer-meta md-typeset"><div class="md-footer-meta__inner md-grid"><div class="md-footer-copyright">powered by <a href="https://www.mkdocs.org">MkDocs</a> and <a href="https://squidfunk.github.io/mkdocs-material/">Material for MkDocs</a></div></div></div></footer></div><script src="../assets/javascripts/application.b260a35d.js"></script><script>app.initialize({version:"1.0.4",url:{base:".."}})</script></body></html>