CINXE.COM

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href=https://docs.crossplane.io/master/learn/feature-lifecycle/>Feature Lifecycle</a></div></div></div><div class="section-container container pe-0 pt-1"><div class=nav-container><a href=https://docs.crossplane.io/contribute/ class="d-inline-flex align-items-center">Contributing Guide</a></div></div><div class="section-container container pe-0 pt-1"><div class="container nav-container pe-0 d-flex w-100"><a class="d-flex w-100 border-0" href="https://github.com/orgs/crossplane/projects/20/views/9?pane=info" target=_blank>Crossplane Roadmap</a><div class="d-flex flex-shrink-1 sidebar-control-container align-self-center"><a href="https://github.com/orgs/crossplane/projects/20/views/9?pane=info"><svg class="flex bi"><use xlink:href="#box-arrow-up-right"/></svg></a></div></div></div></nav></div></div></aside><main class="bd-main order-1"><div class="bd-intro pt-2 ps-lg-2"><div class="d-md-flex flex-md-row-reverse align-items-center justify-content-between"><div class="mb-3 mb-md-0 d-flex"><div class="dropdown float-end bd-dropdown"><a class="btn btn-outline-secondary dropdown-toggle bd-dropdown-item text-reset" href=# role=button id=dropdownMenuLink data-bs-toggle=dropdown aria-haspopup=true aria-expanded=false>master</a><div class="dropdown-menu bd-border-color bd-dropdown" aria-labelledby=dropdownMenuLink><a class="dropdown-item bd-dropdown-item active" aria-current=true href=https://docs.crossplane.io/master/concepts/>master</a> <a class="dropdown-item bd-dropdown-item" href=https://docs.crossplane.io/v1.18/concepts/>v1.18<div class="badge rounded-pill latest">Latest</div></a><a class="dropdown-item bd-dropdown-item" href=https://docs.crossplane.io/v1.17/concepts/>v1.17</a> <a class="dropdown-item bd-dropdown-item" href=https://docs.crossplane.io/v1.16/concepts/>v1.16</a></div></div></div><h1 class="bd-title mb-0" id=content>Concepts</h1></div></div><div class="bd-toc mt-3 mb-5 my-lg-0 ps-xl-3 mb-lg-5"></div><div class="bd-content ps-lg-2 DocSearch-content"><div class="bd-callout bd-callout-danger d-flex flex-column w-100"><div class="d-flex bd-title fs-6 fw-bold border-bottom border-danger"><div class="d-flex pe-3 align-self-center"><svg class="bi flex-shrink-0" role="img" aria-label="Warning:"><use xlink:href="#fire"/></svg></div><div class=d-flex>This document is for an unreleased version of Crossplane.</div></div><div class=mt-3><p>This document applies to the Crossplane <code>master</code> branch and not to the latest release v1.18.</p></div></div><p>Crossplane extends Kubernetes allowing it to create and manage resources external to the Kubernetes cluster. Crossplane enables platform engineers to create custom APIs and abstractions combining both native Kubernetes resources and cloud resources under a single control plane.</p><p>With custom APIs, the platform users, like developers, don’t need to know any details about the underlying resources or requirements.</p><p>The platform users only need to know the details exposed by the platform, like <code>big</code> or <code>small</code> or <code>US</code> or <code>EU</code>. Platform users don’t need to know any details about the underlying provider like instance type or region names.</p><p>Crossplane uses multiple core components to manage the various elements of building and managing external resources through Kubernetes.</p><ul><li><p><a href=https://docs.crossplane.io/master/concepts/pods/><strong>The Crossplane pods</strong></a> include the core Crossplane pod and Crossplane RBAC manager pod. Together these pods manage all Crossplane components and resources.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/providers/><strong>Providers</strong></a> connect Kubernetes to any external provider, like AWS, Azure or GCP. Providers translate Kubernetes native manifests and API calls into external API calls. Providers are responsible for creating, deleting and managing the lifecycle of their resources.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/managed-resources/><strong>Managed resources</strong></a> are Kubernetes objects representing things the Provider created outside of Kubernetes. Creating a managed resource in Kubernetes requires a Provider to create a resource. Deleting a managed resource requires a Provider to delete the associated external resource.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/compositions/><strong>Compositions</strong></a> are a template of managed resources. Compositions describe more complex deployments, combining multiple managed resources and any resource customizations, like the size of a database or the cloud provider region.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/composite-resource-definitions/><strong>Composite Resource Definitions</strong></a> represent a custom API, created by platform engineers and consumed by developers or end users. Composite resource definitions use an OpenAPIv3 schema to further extend Kubernetes with custom API endpoints, revisions and more.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/composite-resources/><strong>Composite Resources</strong></a> represent all the objects created by a user calling the custom API. Every time a user access the custom API Crossplane creates a single Composite Resource and links all the related managed resources to it.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/claims/><strong>Claims</strong></a> are like Composite Resources, but exist in a Kubernetes namespace. Every Claim links to a single cluster scoped Composite Resource. Platform users create Claims in their unique namespace, isolating their resources from other teams in other namespaces.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/environment-configs/><strong>EnvironmentConfigs</strong></a> are an in-memory data store, like a Kubernetes ConfigMap. EnvironmentConfigs are useful for custom resource mapping or storing and retrieving data across Claims and Composite Resources.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/usages/><strong>Usages</strong></a> defining critical resources or custom dependency mappings. Usages can prevent Crossplane from deleting or can ensure that a parent resource waits for Crossplane to delete all child resources first.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/packages/><strong>Packages</strong></a> are a convenient way to package up an entire custom platform and define any other Crossplane related requirements. Packages define how to install Providers, custom APIs or composition functions.</p></li><li><p><a href=https://docs.crossplane.io/master/concepts/image-configs/><strong>ImageConfigs</strong></a> are for centralized control of the configuration of Crossplane package images.</p></li></ul></div></main></div><footer class="bd-footer p-5"><div class="container text-center"><div class="row pb-5 top-row"><div class="col-lg img-col"><img src=/img/crossplane-logo.svg alt="Crossplane logo" srcset="/img/crossplane-logo.svg 1x, /img/crossplane-logo.svg 2x" width=185 height=40 decoding=async data-nimg=future loading=lazy class="d-flex crossplane-footer"></div><div class="col-lg links-col d-fill justify-content-evenly ms-5"><div class=row><div class=col-lg><a class=footer-link target=_blank href=https://twitter.com/crossplane_io>Twitter</a></div><div class=col-lg><a class=footer-link target=_blank href=https://www.youtube.com/channel/UC19FgzMBMqBro361HbE46Fw>Youtube</a></div><div class=col-lg><a class=footer-link target=_blank href="https://www.youtube.com/playlist?list=PL510POnNVaaYFuK-B_SIUrpIonCtLVOzT">Podcast</a></div><div class=col-lg><a class=footer-link target=_blank href=https://groups.google.com/g/crossplane-dev>Forum</a></div></div></div></div><div class="row pb-5"><div class="col-lg copyright-col pe-4 border-end"><p>© Crossplane Authors 2024. 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