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<title data-rh="true">Syncing Hosted Clusters | Rancher</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://ranchermanager.docs.rancher.com/reference-guides/cluster-configuration/rancher-server-configuration/sync-clusters"><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="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Syncing Hosted Clusters | Rancher"><meta data-rh="true" name="description" content="Syncing allows Rancher to update cluster values so that they're up to date with the corresponding cluster object hosted in AKS, EKS or GKE. This enables sources other than Rancher to own a hosted cluster’s state."><meta data-rh="true" property="og:description" content="Syncing allows Rancher to update cluster values so that they're up to date with the corresponding cluster object hosted in AKS, EKS or GKE. This enables sources other than Rancher to own a hosted cluster’s state."><link data-rh="true" rel="icon" href="/img/favicon.png"><link data-rh="true" rel="alternate" href="https://ranchermanager.docs.rancher.com/reference-guides/cluster-configuration/rancher-server-configuration/sync-clusters" hreflang="en"><link data-rh="true" rel="alternate" href="https://ranchermanager.docs.rancher.com/zh/reference-guides/cluster-configuration/rancher-server-configuration/sync-clusters" hreflang="zh"><link data-rh="true" rel="alternate" href="https://ranchermanager.docs.rancher.com/reference-guides/cluster-configuration/rancher-server-configuration/sync-clusters" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://30NEY6C9UY-dsn.algolia.net" crossorigin="anonymous"><link data-rh="true" rel="canonical" href="https://ranchermanager.docs.rancher.com/reference-guides/cluster-configuration/rancher-server-configuration/sync-clusters"><link rel="preconnect" href="https://www.googletagmanager.com">
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itemprop="name">Syncing Hosted Clusters</span><meta itemprop="position" content="4"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Latest</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"><header><h1>Syncing Hosted Clusters</h1></header><p>Syncing allows Rancher to update cluster values so that they're up to date with the corresponding cluster object hosted in AKS, EKS or GKE. This enables sources other than Rancher to own a hosted cluster’s state. </p><div class="theme-admonition theme-admonition-warning alert alert--danger admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M5.05.31c.81 2.17.41 3.38-.52 4.31C3.55 5.67 1.98 6.45.9 7.98c-1.45 2.05-1.7 6.53 3.53 7.7-2.2-1.16-2.67-4.52-.3-6.61-.61 2.03.53 3.33 1.94 2.86 1.39-.47 2.3.53 2.27 1.67-.02.78-.31 1.44-1.13 1.81 3.42-.59 4.78-3.42 4.78-5.56 0-2.84-2.53-3.22-1.25-5.61-1.52.13-2.03 1.13-1.89 2.75.09 1.08-1.02 1.8-1.86 1.33-.67-.41-.66-1.19-.06-1.78C8.18 5.31 8.68 2.45 5.05.32L5.03.3l.02.01z"></path></svg></span>danger</div><div class="admonitionContent_S0QG"><p>You may accidentally overwrite the state from one source if you simultaneously process an update from another source. This may also occur if you process an update from one source within 5 minutes of finishing an update from another source.</p></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="how-it-works">How it works<a href="#how-it-works" class="hash-link" aria-label="Direct link to How it works" title="Direct link to How it works"></a></h3><p>There are two fields on the Rancher Cluster object that must be understood to understand how syncing works:</p><ol><li><p>The config object for the cluster, located on the Spec of the Cluster:</p><ul><li>For AKS, the field is called AKSConfig</li><li>For EKS, the field is called EKSConfig</li><li>For GKE, the field is called GKEConfig</li></ul></li><li><p>The UpstreamSpec object</p><ul><li>For AKS, this is located on the AKSStatus field on the Status of the Cluster.</li><li>For EKS, this is located on the EKSStatus field on the Status of the Cluster.</li><li>For GKE, this is located on the GKEStatus field on the Status of the Cluster.</li></ul></li></ol><p>The struct types that define these objects can be found in their corresponding operator projects:</p><ul><li><a href="https://github.com/rancher/aks-operator/blob/master/pkg/apis/aks.cattle.io/v1/types.go" target="_blank" rel="noopener noreferrer">aks-operator</a></li><li><a href="https://github.com/rancher/eks-operator/blob/master/pkg/apis/eks.cattle.io/v1/types.go" target="_blank" rel="noopener noreferrer">eks-operator</a></li><li><a href="https://github.com/rancher/gke-operator/blob/master/pkg/apis/gke.cattle.io/v1/types.go" target="_blank" rel="noopener noreferrer">gke-operator</a></li></ul><p>All fields are nillable, except for the following: the cluster name, the location (region or zone), Imported, and the cloud credential reference.</p><p>The AKSConfig, EKSConfig or GKEConfig represents the desired state. Nil values are ignored. Fields that are non-nil in the config object can be thought of as managed. When a cluster is created in Rancher, all fields are non-nil and therefore managed. When a pre-existing cluster is registered in Rancher all nillable fields are set to nil and aren't managed. Those fields become managed once their value has been changed by Rancher.</p><p>UpstreamSpec represents the cluster as it is in the hosted Kubernetes provider. It's refreshed every 5 minutes. After the UpstreamSpec is refreshed, Rancher checks if the cluster has an update in progress. If it's currently updating, nothing further is done. If it is not currently updating, any managed fields on AKSConfig, EKSConfig or GKEConfig are overwritten with their corresponding value from the recently updated UpstreamSpec.</p><div class="theme-admonition theme-admonition-warning alert alert--danger admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M5.05.31c.81 2.17.41 3.38-.52 4.31C3.55 5.67 1.98 6.45.9 7.98c-1.45 2.05-1.7 6.53 3.53 7.7-2.2-1.16-2.67-4.52-.3-6.61-.61 2.03.53 3.33 1.94 2.86 1.39-.47 2.3.53 2.27 1.67-.02.78-.31 1.44-1.13 1.81 3.42-.59 4.78-3.42 4.78-5.56 0-2.84-2.53-3.22-1.25-5.61-1.52.13-2.03 1.13-1.89 2.75.09 1.08-1.02 1.8-1.86 1.33-.67-.41-.66-1.19-.06-1.78C8.18 5.31 8.68 2.45 5.05.32L5.03.3l.02.01z"></path></svg></span>danger</div><div class="admonitionContent_S0QG"><p>When you import a cluster from a cloud provider into Rancher, UpstreamSpec represents the cluster state and Config is empty. If you then update the imported cluster through the Rancher UI, both UpstreamSpec and Config become non-null. Any further updates to the cluster should be applied through Rancher. This is because there is no safe way to determine if changes originating from UpstreamSpec represent the desired state or just a mismatch with Config. If you update the imported cluster through the cloud provider console after you apply any updates through the Rancher UI, the controller will deploy a rollback and the content of Config will be considered the desired state.</p></div></div><p>The effective desired state can be thought of as the UpstreamSpec, plus all non-nil fields in the AKSConfig, EKSConfig or GKEConfig. This is what is displayed in the UI.</p><p>If Rancher and another source attempt to update a cluster at the same time, or within 5 minutes of an update finishing, any managed fields are likely to get caught in a race condition. To use EKS as an example, a cluster may have PrivateAccess as a managed field. If PrivateAccess is false and then enabled in EKS console at 11:01, and tags are updated from Rancher before 11:05, then the value is likely to be overwritten. This can also occur if tags are updated while the cluster is still processing the update. The issue described in this example shouldn't occur if the cluster is registered and the PrivateAccess fields are nil.</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/rancher-docs/edit/main/docs/reference-guides/cluster-configuration/rancher-server-configuration/sync-clusters.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="2024-05-07T14:59:19.000Z">May 7, 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="/reference-guides/cluster-configuration/rancher-server-configuration/use-existing-nodes/rancher-agent-options"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Rancher Agent Options</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/reference-guides/cluster-configuration/downstream-cluster-configuration"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Downstream Cluster Configuration</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="#how-it-works" class="table-of-contents__link toc-highlight">How it works</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. 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