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<title data-rh="true">Architecture | Fleet</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://fleet.rancher.io/0.6/architecture"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="0.6"><meta data-rh="true" name="docusaurus_tag" content="docs-default-0.6"><meta data-rh="true" name="docsearch:version" content="0.6"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-0.6"><meta data-rh="true" property="og:title" content="Architecture | Fleet"><meta data-rh="true" name="description" content="Fleet has two primary components. The Fleet manager and the cluster agents. These"><meta data-rh="true" property="og:description" content="Fleet has two primary components. The Fleet manager and the cluster agents. These"><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://fleet.rancher.io/0.6/architecture"><link data-rh="true" rel="alternate" href="https://fleet.rancher.io/0.6/architecture" hreflang="en"><link data-rh="true" rel="alternate" href="https://fleet.rancher.io/0.6/architecture" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://5YEVIM7OXD-dsn.algolia.net" crossorigin="anonymous"><link rel="search" type="application/opensearchdescription+xml" title="Fleet" href="/opensearch.xml"><link rel="stylesheet" href="/assets/css/styles.ff6ab72e.css">
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Image Scan to Update Container Image References</a></li></ul></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="true" href="/0.6/cli/fleet-agent">Reference</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" tabindex="0" href="/0.6/cli/fleet-agent">CLI</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/0.6/cluster-bundles-state">Cluster and Bundle State</a></li><li class="theme-doc-sidebar-item-link 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href="/0.6/troubleshooting">Troubleshooting</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/0.6/changelogs/changelogs/v0.6.0">Changelog</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Fleet<!-- --> <b>0.6</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/architecture">latest version</a></b> (<!-- -->Next 🚧<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Explanations</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Architecture</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 0.6</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Architecture</h1><p>Fleet has two primary components. The Fleet manager and the cluster agents. These
components work in a two-stage pull model. The Fleet manager will pull from git and the
cluster agents will pull from the Fleet manager.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="fleet-manager">Fleet Manager<a href="#fleet-manager" class="hash-link" aria-label="Direct link to Fleet Manager" title="Direct link to Fleet Manager"></a></h2><p>The Fleet manager is a set of Kubernetes controllers running in any standard Kubernetes
cluster. The only API exposed by the Fleet manager is the Kubernetes API, there is no
custom API for the fleet controller.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="cluster-agents">Cluster Agents<a href="#cluster-agents" class="hash-link" aria-label="Direct link to Cluster Agents" title="Direct link to Cluster Agents"></a></h2><p>One cluster agent runs in each cluster and is responsible for talking to the Fleet manager.
The only communication from cluster to Fleet manager is by this agent and all communication
goes from the managed cluster to the Fleet manager. The fleet manager does not initiate
connections to downstream clusters. This means managed clusters can run in private networks and behind
NATs. The only requirement is the cluster agent needs to be able to communicate with the
Kubernetes API of the cluster running the Fleet manager. The one exception to this is if you use
the <a href="/0.6/cluster-registration#manager-initiated">manager initiated</a> cluster registration flow. This is not required, but
an optional pattern.</p><p>The cluster agents are not assumed to have an &quot;always on&quot; connection. They will resume operation as
soon as they can connect. Future enhancements will probably add the ability to schedule times of when
the agent checks in, as it stands right now they will always attempt to connect.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="security">Security<a href="#security" class="hash-link" aria-label="Direct link to Security" title="Direct link to Security"></a></h2><p>The Fleet manager dynamically creates service accounts, manages their RBAC and then gives the
tokens to the downstream clusters. Clusters are registered by optionally expiring cluster registration tokens.
The cluster registration token is used only during the registration process to generate a credential specific
to that cluster. After the cluster credential is established the cluster &quot;forgets&quot; the cluster registration
token.</p><p>The service accounts given to the clusters only have privileges to list <code>BundleDeployment</code> in the namespace created
specifically for that cluster. It can also update the <code>status</code> subresource of <code>BundleDeployment</code> and the <code>status</code>
subresource of it&#x27;s <code>Cluster</code> resource.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="component-overview">Component Overview<a href="#component-overview" class="hash-link" aria-label="Direct link to Component Overview" title="Direct link to Component Overview"></a></h2><p>An overview of the components and how they interact on a high level.</p><p><img loading="lazy" alt="Components" src="/assets/images/FleetComponents-2746fa09558c69f438948ab9bc659edb.svg" width="1319" height="1281" class="img_ev3q"></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/rancher/fleet-docs/edit/main/versioned_docs/version-0.6/architecture.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2024-10-18T11:42:02.000Z">Oct 18, 2024</time></b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/0.6/uninstall"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Uninstall</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/0.6/concepts"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Core Concepts</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#fleet-manager" class="table-of-contents__link toc-highlight">Fleet Manager</a></li><li><a href="#cluster-agents" class="table-of-contents__link toc-highlight">Cluster Agents</a></li><li><a href="#security" class="table-of-contents__link toc-highlight">Security</a></li><li><a href="#component-overview" class="table-of-contents__link toc-highlight">Component Overview</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2024 SUSE Rancher. All Rights Reserved.</div></div></div></footer></div>
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