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672 lines
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HTML
672 lines
22 KiB
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link rel="canonical" href="https://containrrr.dev/watchtower/usage-overview/">
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<link rel="prev" href="../introduction/">
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<meta name="generator" content="mkdocs-1.5.3, mkdocs-material-9.4.8">
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<title>Usage overview - Watchtower</title>
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<link rel="stylesheet" href="../assets/stylesheets/main.4b4a2bd9.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<link rel="stylesheet" href="../stylesheets/theme.css">
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<script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="containrrr" data-md-color-primary="indigo" data-md-color-accent="indigo">
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<script>var palette=__md_get("__palette");if(palette&&"object"==typeof palette.color)for(var key of Object.keys(palette.color))document.body.setAttribute("data-md-color-"+key,palette.color[key])</script>
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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</div>
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<div data-md-component="announce">
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</div>
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<header class="md-header md-header--shadow" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href=".." title="Watchtower" class="md-header__button md-logo" aria-label="Watchtower" data-md-component="logo">
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<img src="../images/logo-450px.png" alt="logo">
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</a>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></svg>
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</label>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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Watchtower
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</span>
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Usage overview
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</span>
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</div>
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</div>
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</div>
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<form class="md-header__option" data-md-component="palette">
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<input class="md-option" data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme="containrrr" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_1">
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<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_2" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="m17.75 4.09-2.53 1.94.91 3.06-2.63-1.81-2.63 1.81.91-3.06-2.53-1.94L12.44 4l1.06-3 1.06 3 3.19.09m3.5 6.91-1.64 1.25.59 1.98-1.7-1.17-1.7 1.17.59-1.98L15.75 11l2.06-.05L18.5 9l.69 1.95 2.06.05m-2.28 4.95c.83-.08 1.72 1.1 1.19 1.85-.32.45-.66.87-1.08 1.27C15.17 23 8.84 23 4.94 19.07c-3.91-3.9-3.91-10.24 0-14.14.4-.4.82-.76 1.27-1.08.75-.53 1.93.36 1.85 1.19-.27 2.86.69 5.83 2.89 8.02a9.96 9.96 0 0 0 8.02 2.89m-1.64 2.02a12.08 12.08 0 0 1-7.8-3.47c-2.17-2.19-3.33-5-3.49-7.82-2.81 3.14-2.7 7.96.31 10.98 3.02 3.01 7.84 3.12 10.98.31Z"/></svg>
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<input class="md-option" data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme="containrrr-dark" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_2">
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<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_1" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 7a5 5 0 0 1 5 5 5 5 0 0 1-5 5 5 5 0 0 1-5-5 5 5 0 0 1 5-5m0 2a3 3 0 0 0-3 3 3 3 0 0 0 3 3 3 3 0 0 0 3-3 3 3 0 0 0-3-3m0-7 2.39 3.42C13.65 5.15 12.84 5 12 5c-.84 0-1.65.15-2.39.42L12 2M3.34 7l4.16-.35A7.2 7.2 0 0 0 5.94 8.5c-.44.74-.69 1.5-.83 2.29L3.34 7m.02 10 1.76-3.77a7.131 7.131 0 0 0 2.38 4.14L3.36 17M20.65 7l-1.77 3.79a7.023 7.023 0 0 0-2.38-4.15l4.15.36m-.01 10-4.14.36c.59-.51 1.12-1.14 1.54-1.86.42-.73.69-1.5.83-2.29L20.64 17M12 22l-2.41-3.44c.74.27 1.55.44 2.41.44.82 0 1.63-.17 2.37-.44L12 22Z"/></svg>
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</label>
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</form>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg>
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</label>
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<nav class="md-search__options" aria-label="Search">
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41Z"/></svg>
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</button>
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</nav>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="md-header__source">
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<a href="https://github.com/containrrr/watchtower/" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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</div>
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<div class="md-source__repository">
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GitHub
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</div>
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</a>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href=".." title="Watchtower" class="md-nav__button md-logo" aria-label="Watchtower" data-md-component="logo">
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<img src="../images/logo-450px.png" alt="logo">
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</a>
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Watchtower
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</label>
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<div class="md-nav__source">
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<a href="https://github.com/containrrr/watchtower/" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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</div>
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<div class="md-source__repository">
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GitHub
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</div>
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</a>
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</div>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href=".." class="md-nav__link">
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<span class="md-ellipsis">
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Home
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../introduction/" class="md-nav__link">
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<span class="md-ellipsis">
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Introduction
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
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Usage overview
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../arguments/" class="md-nav__link">
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<span class="md-ellipsis">
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Arguments
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../notifications/" class="md-nav__link">
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<span class="md-ellipsis">
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Notifications
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../container-selection/" class="md-nav__link">
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<span class="md-ellipsis">
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Container selection
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../private-registries/" class="md-nav__link">
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<span class="md-ellipsis">
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Private registries
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../linked-containers/" class="md-nav__link">
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<span class="md-ellipsis">
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Linked containers
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../remote-hosts/" class="md-nav__link">
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<span class="md-ellipsis">
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Remote hosts
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../secure-connections/" class="md-nav__link">
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<span class="md-ellipsis">
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Secure connections
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../stop-signals/" class="md-nav__link">
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<span class="md-ellipsis">
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Stop signals
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../lifecycle-hooks/" class="md-nav__link">
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<span class="md-ellipsis">
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Lifecycle hooks
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../running-multiple-instances/" class="md-nav__link">
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<span class="md-ellipsis">
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Running multiple instances
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../http-api-mode/" class="md-nav__link">
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<span class="md-ellipsis">
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HTTP API Mode
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Metrics
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<h1>Usage overview</h1>
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<p>Watchtower is itself packaged as a Docker container so installation is as simple as pulling the <code>containrrr/watchtower</code> image. If you are using ARM based architecture, pull the appropriate <code>containrrr/watchtower:armhf-<tag></code> image from the <a href="https://hub.docker.com/r/containrrr/watchtower/tags/">containrrr Docker Hub</a>.</p>
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<p>Since the watchtower code needs to interact with the Docker API in order to monitor the running containers, you need to mount <em>/var/run/docker.sock</em> into the container with the <code>-v</code> flag when you run it.</p>
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<p>Run the <code>watchtower</code> container with the following command:</p>
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<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>run<span class="w"> </span>-d<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>--name<span class="w"> </span>watchtower<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-v<span class="w"> </span>/var/run/docker.sock:/var/run/docker.sock<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>containrrr/watchtower
|
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</code></pre></div>
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<p>If pulling images from private Docker registries, supply registry authentication credentials with the environment variables <code>REPO_USER</code> and <code>REPO_PASS</code>
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or by mounting the host's docker config file into the container (at the root of the container filesystem <code>/</code>).</p>
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<p>Passing environment variables:</p>
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<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>run<span class="w"> </span>-d<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>--name<span class="w"> </span>watchtower<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-e<span class="w"> </span><span class="nv">REPO_USER</span><span class="o">=</span>username<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-e<span class="w"> </span><span class="nv">REPO_PASS</span><span class="o">=</span>password<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-v<span class="w"> </span>/var/run/docker.sock:/var/run/docker.sock<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>containrrr/watchtower<span class="w"> </span>container_to_watch<span class="w"> </span>--debug
|
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</code></pre></div>
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<p>Also check out <a href="https://stackoverflow.com/a/30494145/7872793">this Stack Overflow answer</a> for more options on how to pass environment variables.</p>
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<p>Alternatively if you 2FA authentication setup on Docker Hub then passing username and password will be insufficient. Instead you can run <code>docker login</code> to store your credentials in <code>$HOME/.docker/config.json</code> and then mount this config file to make it available to the Watchtower container:</p>
|
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<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>run<span class="w"> </span>-d<span class="w"> </span><span class="se">\</span>
|
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<span class="w"> </span>--name<span class="w"> </span>watchtower<span class="w"> </span><span class="se">\</span>
|
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<span class="w"> </span>-v<span class="w"> </span><span class="nv">$HOME</span>/.docker/config.json:/config.json<span class="w"> </span><span class="se">\</span>
|
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<span class="w"> </span>-v<span class="w"> </span>/var/run/docker.sock:/var/run/docker.sock<span class="w"> </span><span class="se">\</span>
|
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<span class="w"> </span>containrrr/watchtower<span class="w"> </span>container_to_watch<span class="w"> </span>--debug
|
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</code></pre></div>
|
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<div class="admonition note">
|
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<p class="admonition-title">Changes to config.json while running</p>
|
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<p>If you mount <code>config.json</code> in the manner above, changes from the host system will (generally) not be propagated to the
|
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running container. Mounting files into the Docker daemon uses bind mounts, which are based on inodes. Most
|
|
applications (including <code>docker login</code> and <code>vim</code>) will not directly edit the file, but instead make a copy and replace
|
|
the original file, which results in a new inode which in turn <em>breaks</em> the bind mount.<br />
|
|
<strong>As a workaround</strong>, you can create a symlink to your <code>config.json</code> file and then mount the symlink in the container.
|
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The symlinked file will always have the same inode, which keeps the bind mount intact and will ensure changes
|
|
to the original file are propagated to the running container (regardless of the inode of the source file!).</p>
|
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</div>
|
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<p>If you mount the config file as described above, be sure to also prepend the URL for the registry when starting up your
|
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watched image (you can omit the https://). Here is a complete docker-compose.yml file that starts up a docker container
|
|
from a private repo on the GitHub Registry and monitors it with watchtower. Note the command argument changing the interval
|
|
to 30s rather than the default 24 hours.</p>
|
|
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="s">"3"</span>
|
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<span class="nt">services</span><span class="p">:</span>
|
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<span class="w"> </span><span class="nt">cavo</span><span class="p">:</span>
|
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<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ghcr.io/<org>/<image>:<tag></span>
|
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<span class="w"> </span><span class="nt">ports</span><span class="p">:</span>
|
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<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">"443:3443"</span>
|
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<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">"80:3080"</span>
|
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<span class="w"> </span><span class="nt">watchtower</span><span class="p">:</span>
|
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<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">containrrr/watchtower</span>
|
|
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
|
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<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/var/run/docker.sock:/var/run/docker.sock</span>
|
|
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/root/.docker/config.json:/config.json</span>
|
|
<span class="w"> </span><span class="nt">command</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--interval 30</span>
|
|
</code></pre></div>
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