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<!DOCTYPE html> <html lang="en" dir="auto"> <head><meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5, user-scalable=no"> <meta name="description" content="Introduction Table of contents NFD-Master NFD-Worker NFD-Topology-Updater NFD-GC Feature Discovery Node annotations Custom resources This software ..."> <meta name="revised" content=""> <meta name="author" content="Kubernetes SIGs"> <meta name="generator" content="jekyll-rtd-theme v2.0.10"><meta name="theme-color" content="#2980b9"> <title>Introduction · Node Feature Discovery</title> <meta name="twitter:title" content="Introduction · Node Feature Discovery"> <meta name="twitter:description" content="Introduction Table of contents NFD-Master NFD-Worker NFD-Topology-Updater NFD-GC Feature Discovery Node annotations Custom resources This software ..."> <meta name="twitter:card" content="summary"> <meta name="twitter:site" content="@Kubernetes SIGs"> <meta name="twitter:url" content="https://kubernetes-sigs.github.com/node-feature-discovery/v0.16/get-started/introduction.html"> <meta name="twitter:creator" content="@jekyll-rtd-theme v2.0.10"> <meta property="og:title" content="Introduction · Node Feature Discovery"> <meta property="og:description" content="Introduction Table of contents NFD-Master NFD-Worker NFD-Topology-Updater NFD-GC Feature Discovery Node annotations Custom resources This software ..."> <meta property="og:locale" content="en"> <meta property="og:url" content="https://kubernetes-sigs.github.com/node-feature-discovery/v0.16/get-started/introduction.html"> <meta property="og:type" content="article"> <meta property="article:author" content="Kubernetes SIGs"> <meta property="article:published_time" content="2016-07-23T05:07:52+00:00"> <meta property="article:modified_time" content="2024-12-13T11:23:21+00:00"> <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Article", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://kubernetes-sigs.github.com/node-feature-discovery/v0.16/get-started/introduction.html" }, "headline": "Introduction · Node Feature Discovery", "image": [], "author": { "@type": "Person", "name": "Kubernetes SIGs" }, "datePublished": "2016-07-23T05:07:52+00:00", "dateModified": "2024-12-13T11:23:21+00:00", "publisher": { "@type": "Organization", "name": "Kubernetes SIGs", "logo": { "@type": "ImageObject", "url": "https://avatars.githubusercontent.com/u/36015203?v=4" } }, "description": "Introduction Table of contents NFD-Master NFD-Worker NFD-Topology-Updater NFD-GC Feature Discovery Node annotations Custom resources This software ..." } </script> <link rel="dns-prefetch" href="https://cdn.jsdelivr.net"><link rel="next" href="https://kubernetes-sigs.github.com/node-feature-discovery/v0.16/get-started/quick-start.html"><link rel="canonical" href="https://kubernetes-sigs.github.com/node-feature-discovery/v0.16/get-started/introduction.html"><link rel="icon" type="image/svg+xml" href="/node-feature-discovery/v0.16/assets/images/favicon.svg"><link rel="icon" type="image/png" href="/node-feature-discovery/v0.16/assets/images/favicon-16x16.png" sizes="16x16"> <link rel="icon" type="image/png" href="/node-feature-discovery/v0.16/assets/images/favicon-32x32.png" sizes="32x32"> <link rel="icon" type="image/png" href="/node-feature-discovery/v0.16/assets/images/favicon-96x96.png" sizes="96x96"><link rel="mask-icon" href="/node-feature-discovery/v0.16/assets/images/favicon.svg" color="#2980b9"><link rel="apple-touch-icon" href="/node-feature-discovery/v0.16/assets/images/apple-touch-icon-300x300.jpg"> <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/rundocs/jekyll-rtd-theme@2.0.10/assets/css/theme.min.css"><style>@media (min-width: 1280px){.content-wrap{max-width:1200px}}</style><script> window.ui = { title: "Node Feature Discovery", baseurl: "/node-feature-discovery/v0.16", i18n: { search_results: "Search Results", search_results_found: "Search finished, found # page(s) matching the search query.", search_results_not_found: "Your search did not match any documents, please make sure that all characters are spelled correctly!" } }; </script> </head> <body class="container"><div class="sidebar-wrap overflow-hidden"> <div class="sidebar height-full overflow-y-scroll overflow-x-hidden"> <div class="header d-flex flex-column p-3 text-center"> <div class="title pb-1"> <a class="h4 no-underline py-1 px-2 rounded-1" href="/node-feature-discovery/v0.16/" title="Documentation of Node Feature Discovery - a Kubernetes add-on for discovering and advertising hardware features and system configuration in the cluster."> <i class="fa fa-home"></i> Node Feature Discovery </a> </div> <span class="version">v0.16.6</span> <form class="search pt-2" action="/node-feature-discovery/v0.16/search.html" method="get" autocomplete="off"> <input class="form-control input-block input-sm" type="text" name="q" placeholder="Search docs..."> </form> </div> <div class="toctree py-2" data-spy="affix" role="navigation" aria-label="main navigation"> <ul> </ul> <a class="caption d-block text-uppercase no-wrap px-2 py-0" href="/node-feature-discovery/v0.16/get-started/"> Get started </a><ul> <li class="toc level-1 current" data-sort="1" data-level="1"> <a class="d-flex flex-items-baseline current" href="/node-feature-discovery/v0.16/get-started/introduction.html">1. Introduction</a> </li> <li class="toc level-1 " data-sort="2" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/get-started/quick-start.html">2. Quick start</a> </li></ul> <a class="caption d-block text-uppercase no-wrap px-2 py-0" href="/node-feature-discovery/v0.16/deployment/"> Deployment </a><ul> <li class="toc level-1 " data-sort="1" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/image-variants.html">1. Image variants</a> </li> <li class="toc level-1 " data-sort="2" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/kustomize.html">2. Kustomize</a> </li> <li class="toc level-1 " data-sort="3" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/helm.html">3. Helm</a> </li> <li class="toc level-1 " data-sort="4" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/operator.html">4. NFD Operator</a> </li> <li class="toc level-1 " data-sort="5" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/tls.html">5. TLS authentication</a> </li> <li class="toc level-1 " data-sort="6" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/uninstallation.html">6. Uninstallation</a> </li> <li class="toc level-1 " data-sort="7" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/deployment/metrics.html">7. Metrics</a> </li></ul> <a class="caption d-block text-uppercase no-wrap px-2 py-0" href="/node-feature-discovery/v0.16/usage/"> Usage </a><ul> <li class="toc level-1 " data-sort="1" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/features.html">1. Feature labels</a> </li> <li class="toc level-1 " data-sort="2" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/using-labels.html">2. Using node labels</a> </li> <li class="toc level-1 " data-sort="3" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/nfd-master.html">3. NFD-Master</a> </li> <li class="toc level-1 " data-sort="4" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/nfd-worker.html">4. NFD-Worker</a> </li> <li class="toc level-1 " data-sort="5" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/nfd-topology-updater.html">5. NFD-Topology-Updater</a> </li> <li class="toc level-1 " data-sort="6" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/nfd-gc.html">6. NFD-Garbage-Collector</a> </li> <li class="toc level-1 " data-sort="7" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/custom-resources.html">7. CRDs</a> </li> <li class="toc level-1 " data-sort="8" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/customization-guide.html">8. Customization guide</a> </li> <li class="toc level-1 " data-sort="9" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/examples-and-demos.html">9. Examples and demos</a> </li> <li class="toc level-1 " data-sort="10" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/usage/kubectl-plugin.html">10. Kubectl plugin</a> </li></ul> <a class="caption d-block text-uppercase no-wrap px-2 py-0" href="/node-feature-discovery/v0.16/reference/"> Reference </a><ul> <li class="toc level-1 " data-sort="1" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/master-commandline-reference.html">1. Master cmdline reference</a> </li> <li class="toc level-1 " data-sort="2" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/worker-commandline-reference.html">2. Worker cmdline reference</a> </li> <li class="toc level-1 " data-sort="3" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/master-configuration-reference.html">3. Master config reference</a> </li> <li class="toc level-1 " data-sort="4" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/worker-configuration-reference.html">4. Worker config reference</a> </li> <li class="toc level-1 " data-sort="5" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/topology-updater-commandline-reference.html">5. Topology Updater Cmdline Reference</a> </li> <li class="toc level-1 " data-sort="6" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/topology-updater-configuration-reference.html">6. Topology-Updater config reference</a> </li> <li class="toc level-1 " data-sort="7" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/gc-commandline-reference.html">7. Garbage Collector Cmdline Reference</a> </li> <li class="toc level-1 " data-sort="8" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/plugin-commandline-reference.html">8. Kubectl plugin cmdline reference</a> </li> <li class="toc level-1 " data-sort="9" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/versions.html">9. Versions</a> </li> <li class="toc level-1 " data-sort="10" data-level="1"> <a class="d-flex flex-items-baseline " href="/node-feature-discovery/v0.16/reference/feature-gates.html">10. Feature Gates</a> </li></ul> <a class="caption d-block text-uppercase no-wrap px-2 py-0" href="/node-feature-discovery/v0.16/developer-guide/"> Developer guide </a><ul> </ul> <a class="caption d-block text-uppercase no-wrap px-2 py-0" href="/node-feature-discovery/v0.16/contributing/"> Contributing </a><ul> </ul> </div> </div> </div> <div class="content-wrap"> <div class="header d-flex flex-justify-between p-2 hide-lg hide-xl" aria-label="top navigation"> <button id="toggle" aria-label="Toggle menu" class="btn-octicon p-2 m-0 text-white" type="button"> <i class="fa fa-bars"></i> </button> <div class="title flex-1 d-flex flex-justify-center"> <a class="h4 no-underline py-1 px-2 rounded-1" href="/node-feature-discovery/v0.16/">Node Feature Discovery</a> </div> </div> <div class="content p-3 p-sm-5"> <div class="navigation-top d-flex flex-justify-between"> <ul class="breadcrumb" role="navigation" aria-label="breadcrumbs navigation"> <li class="breadcrumb-item"> <a class="no-underline" href="/node-feature-discovery/v0.16/" title="/"> <i class="fa fa-home"></i> </a> </li><li class="breadcrumb-item" ><a href="/node-feature-discovery/v0.16/get-started/">get-started</a></li><li class="breadcrumb-item" aria-current="page">introduction.md</li></ul> <a class="edit" href="https://github.com/kubernetes-sigs/node-feature-discovery/edit/gh-pages/get-started/introduction.md" title="Edit on GitHub" rel="noreferrer" target="_blank"> <i class="fa fa-edit"></i> </a> </div> <hr> <div role="main" itemscope="itemscope" itemtype="https://schema.org/Article"> <div class="markdown-body" itemprop="articleBody"> <h1 class="no_toc" id="introduction">Introduction</h1> <h2 class="no_toc text-delta" id="table-of-contents">Table of contents</h2> <ol id="markdown-toc"> <li><a href="#nfd-master" id="markdown-toc-nfd-master">NFD-Master</a></li> <li><a href="#nfd-worker" id="markdown-toc-nfd-worker">NFD-Worker</a></li> <li><a href="#nfd-topology-updater" id="markdown-toc-nfd-topology-updater">NFD-Topology-Updater</a></li> <li><a href="#nfd-gc" id="markdown-toc-nfd-gc">NFD-GC</a></li> <li><a href="#feature-discovery" id="markdown-toc-feature-discovery">Feature Discovery</a></li> <li><a href="#node-annotations" id="markdown-toc-node-annotations">Node annotations</a></li> <li><a href="#custom-resources" id="markdown-toc-custom-resources">Custom resources</a></li> </ol> <hr /> <p>This software enables node feature discovery for Kubernetes. It detects hardware features available on each node in a Kubernetes cluster, and advertises those features using node labels and optionally node extended resources, annotations and node taints. Node Feature Discovery is compatible with any recent version of Kubernetes (v1.24+).</p> <p>NFD consists of four software components:</p> <ol> <li>nfd-master</li> <li>nfd-worker</li> <li>nfd-topology-updater</li> <li>nfd-gc</li> </ol> <h2 id="nfd-master">NFD-Master</h2> <p>NFD-Master is the daemon responsible for communication towards the Kubernetes API. That is, it receives labeling requests from the worker and modifies node objects accordingly.</p> <h2 id="nfd-worker">NFD-Worker</h2> <p>NFD-Worker is a daemon responsible for feature detection. It then communicates the information to nfd-master which does the actual node labeling. One instance of nfd-worker is supposed to be running on each node of the cluster,</p> <h2 id="nfd-topology-updater">NFD-Topology-Updater</h2> <p>NFD-Topology-Updater is a daemon responsible for examining allocated resources on a worker node to account for resources available to be allocated to new pod on a per-zone basis (where a zone can be a NUMA node). It then creates or updates a <a href="/node-feature-discovery/v0.16/usage/custom-resources.html#noderesourcetopology">NodeResourceTopology</a> custom resource object specific to this node. One instance of nfd-topology-updater is supposed to be running on each node of the cluster.</p> <h2 id="nfd-gc">NFD-GC</h2> <p>NFD-GC is a daemon responsible for cleaning obsolete <a href="/node-feature-discovery/v0.16/usage/custom-resources.html#nodefeature">NodeFeature</a> and <a href="/node-feature-discovery/v0.16/usage/custom-resources.html#noderesourcetopology">NodeResourceTopology</a> objects.</p> <p>One instance of nfd-gc is supposed to be running in the cluster.</p> <h2 id="feature-discovery">Feature Discovery</h2> <p>Feature discovery is divided into domain-specific feature sources:</p> <ul> <li>CPU</li> <li>Kernel</li> <li>Memory</li> <li>Network</li> <li>PCI</li> <li>Storage</li> <li>System</li> <li>USB</li> <li>Custom (rule-based custom features)</li> <li>Local (hooks for user-specific features)</li> </ul> <p>Each feature source is responsible for detecting a set of features which. in turn, are turned into node feature labels. Feature labels are prefixed with <code class="language-plaintext highlighter-rouge notranslate">feature.node.kubernetes.io/</code> and also contain the name of the feature source. Non-standard user-specific feature labels can be created with the local and custom feature sources.</p> <p>An overview of the default feature labels:</p> <div class="language-json highlighter-rouge notranslate"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/cpu-<feature-name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"true"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/custom-<feature-name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"true"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/kernel-<feature name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"<feature value>"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/memory-<feature-name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"true"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/network-<feature-name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"true"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/pci-<device label>.present"</span><span class="p">:</span><span class="w"> </span><span class="s2">"true"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/storage-<feature-name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"true"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/system-<feature name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"<feature value>"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/usb-<device label>.present"</span><span class="p">:</span><span class="w"> </span><span class="s2">"<feature value>"</span><span class="p">,</span><span class="w">
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</span><span class="nl">"feature.node.kubernetes.io/<file name>-<feature name>"</span><span class="p">:</span><span class="w"> </span><span class="s2">"<feature value>"</span><span class="w">
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</span><span class="p">}</span><span class="w">
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</span></code></pre> </div></div> <h2 id="node-annotations">Node annotations</h2> <p>NFD also annotates nodes it is running on:</p> <table> <thead> <tr> <th>Annotation</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>[<instance>.]nfd.node.kubernetes.io/feature-labels</td> <td>Comma-separated list of node labels managed by NFD. NFD uses this internally so must not be edited by users.</td> </tr> <tr> <td>[<instance>.]nfd.node.kubernetes.io/feature-annotations</td> <td>Comma-separated list of node annotations managed by NFD. NFD uses this internally so must not be edited by users.</td> </tr> <tr> <td>[<instance>.]nfd.node.kubernetes.io/extended-resources</td> <td>Comma-separated list of node extended resources managed by NFD. NFD uses this internally so must not be edited by users.</td> </tr> <tr> <td>[<instance>.]nfd.node.kubernetes.io/taints</td> <td>Comma-separated list of node taints managed by NFD. NFD uses this internally so must not be edited by users.</td> </tr> </tbody> </table> <blockquote> <p><strong>NOTE:</strong> the <a href="/node-feature-discovery/v0.16/reference/master-commandline-reference.html#instance"><code class="language-plaintext highlighter-rouge notranslate">-instance</code></a> command line flag affects the annotation names</p> </blockquote> <p>Unapplicable annotations are not created, i.e. for example <code class="language-plaintext highlighter-rouge notranslate">nfd.node.kubernetes.io/extended-resources</code> is only placed if some extended resources were created by NFD.</p> <h2 id="custom-resources">Custom resources</h2> <p>NFD takes use of some Kubernetes Custom Resources.</p> <p><a href="/node-feature-discovery/v0.16/usage/custom-resources.html#nodefeature">NodeFeature</a>s is be used for representing node features and requesting node labels to be generated.</p> <p>NFD-Master uses <a href="/node-feature-discovery/v0.16/usage/custom-resources.html#nodefeaturerule">NodeFeatureRule</a>s for custom labeling of nodes.</p> <p>NFD-Topology-Updater creates <a href="/node-feature-discovery/v0.16/usage/custom-resources.html#noderesourcetopology">NodeResourceTopology</a> objects that describe the hardware topology of node resources.</p> </div> </div> <div class="navigation-bottom d-flex flex-justify-between py-3" role="navigation" aria-label="footer navigation"> <div class="prev"></div> <div class="next"><a href="/node-feature-discovery/v0.16/get-started/quick-start.html" class="btn" title="Quick start" accesskey="n" rel="next"> Next <i class="fa fa-arrow-circle-right"></i> </a></div> </div><hr> <div class="copyright text-center text-gray" role="contentinfo"> <i class="fa fa-copyright"></i> <span class="time">2016-2024,</span> <a class="text-gray" href="https://github.com/kubernetes-sigs" rel="noreferrer" target="_blank">Kubernetes SIGs</a> Revision <a class="text-gray" href="https://github.com/kubernetes-sigs/node-feature-discovery/commit/" title="" rel="noreferrer" target="_blank"></a> <br> <div class="generator"> Built with <a href="https://pages.github.com" rel="noreferrer" target="_blank" title="github-pages v228">GitHub Pages</a> using a <a href="https://github.com/rundocs/jekyll-rtd-theme" rel="noreferrer" target="_blank" title="jekyll-rtd-theme v2.0.10">theme</a> provided by <a href="https://rundocs.io" rel="noreferrer" target="_blank">RunDocs</a>. </div> </div> </div> </div> <div class="addons-wrap d-flex flex-column overflow-y-auto"> <div class="status d-flex flex-justify-between p-2"> <div class="title p-1"> <i class="fa fa-book"></i> Node Feature Discovery </div> <div class="branch p-1"> <span class="name"> v0.16 </span> <i class="fa fa-caret-down"></i> </div> </div> <div class="addons d-flex flex-column height-full p-2 d-none"> <dl id="versions"> <dt>Versions</dt> <script src="/node-feature-discovery/versions.js"></script> <script> var dt = document.getElementById('versions'); var items = getVersionListItems(); for (var i=0; i < items.length; i++) { var dd = document.createElement('dd'); var a = dd.appendChild(document.createElement('a')); a.appendChild(document.createTextNode(items[i].name)); a.href = items[i].url; dt.appendChild(dd); } </script> </dl> <dl> <dt>GitHub</dt> <dd> <a href="https://github.com/kubernetes-sigs/node-feature-discovery" title="Stars: 805"> <i class="fa fa-github"></i> Homepage </a> </dd> <dd> <a href="https://github.com/kubernetes-sigs/node-feature-discovery/issues" title="Open issues: 48"> <i class="fa fa-question-circle-o"></i> Issues </a> </dd> <dd> <a href="https://github.com/kubernetes-sigs/node-feature-discovery/zipball/gh-pages" title="Size: 107463 Kb"> <i class="fa fa-download"></i> Download </a> </dd> </dl> <hr> <div class="license f6 pb-2"> This <a href="/node-feature-discovery/v0.16/" title="Node Feature Discovery">Software</a> is under the terms of <a href="https://github.com/kubernetes-sigs/node-feature-discovery">Apache License 2.0</a>. </div> </div> </div> <script src="https://cdn.jsdelivr.net/gh/rundocs/jekyll-rtd-theme@2.0.10/assets/js/jquery.min.js"></script><script src="https://cdn.jsdelivr.net/gh/rundocs/jekyll-rtd-theme@2.0.10/assets/js/theme.min.js"></script> </body> </html> |