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What Crossplane does
Crossplane is a control-plane framework for platform engineering. Installed in a Kubernetes cluster, it adds APIs for platform-defined requests and provider-defined managed resources. Developers can submit those requests using Kubernetes tools and workflows; platform teams retain control over how each request is implemented.
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The key idea is to present a stable, useful platform API while keeping implementation choices behind it. A consumer can ask for a capability without needing to know every provider resource or configuration detail involved in delivering it.
The Tool Desk
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Crossplane’s API and reconciliation model has four main parts. An XRD defines the schema for a custom API; an XR is a request made through that API; a Composition describes the resources that should result; and composition functions process the request in a pipeline to determine the resources Crossplane should create or update. The current composite resources documentation and compositions documentation describe these concepts.
#1 Best Overall
- Define the API with an XRD. The Composite Resource Definition establishes the shape of the platform API that consumers will use.
- Submit an XR. A Composite Resource is an instance of that API: the consumer’s request for a platform capability.
- Resolve the request through a Composition. The Composition and its function pipeline determine which resources should be created or updated to meet the request.
- Reconcile toward the desired state. Crossplane’s controllers act on the resulting resource definitions and continue reconciling them through Kubernetes.
A Composition is a template, not a command to immediately instantiate every resource it describes. The XR request is what triggers composition. This distinction is also stated in the older Crossplane v1.20 introduction; use the current v2.4 documentation for current terminology and behavior.
Where providers come in
Providers connect Kubernetes-managed resource APIs to external services. A provider supplies controller logic, handles authentication, and makes the external API calls needed to manage a resource. Crossplane’s provider documentation lists AWS, Azure, GCP, and Kubernetes providers as examples; provider packages are installed from a container registry. See Providers · Crossplane v2.4.
Provider packages are a separate layer from the platform API: consumers can work with an XR, while the platform’s Composition and functions select provider resources behind it. For repeatable installations, the documentation describes pinning a provider package by image digest. Teams should also decide deliberately how package updates are reviewed and promoted.
Choose an installation path
The right starting point depends on whether you are deploying Crossplane into an existing cluster or building a platform API locally.
Rank #3
| Path | Best suited to | Prerequisites and workflow | Promotion and cautions |
|---|---|---|---|
| Helm installation | Installing Crossplane into an existing Kubernetes cluster. | The v2.4 install guide requires an actively supported Kubernetes version and Helm v3.2.0 or later. Install using the Crossplane Helm chart. | Use the release-specific install instructions and review feature flags for that release. Source: Install Crossplane · Crossplane v2.4. |
| CLI control plane project workflow | Developing and packaging a platform API locally. | The documented workflow uses the Crossplane CLI, a Docker-compatible runtime, and a KIND cluster. A project directory can include API definitions, Compositions, embedded functions, examples, and crossplane-project.yaml. |
The walkthrough builds function and Configuration packages, installs the project on the local control plane, then shows packaging and pushing the API for installation on an existing Crossplane cluster. The page is under the master CLI documentation path, so verify commands against the CLI release you choose. Source: Get Started with Control Plane Projects · Crossplane master. |
Install into an existing cluster
Use the v2.4 installation guide as the release-specific starting point. Confirm the Kubernetes version is actively supported and that Helm is v3.2.0 or later before following its chart installation steps.
Develop a project locally
The CLI project workflow is aimed at authoring and packaging an API rather than directly serving as the production-cluster installation path. The guide describes a local control plane in KIND, project contents, package builds, and a route to push the resulting API for installation on an existing Crossplane cluster. Because the walkthrough is on the CLI master documentation path, command availability and behavior may differ from a stable CLI release.
Permissions are part of the platform design
Composition is a consequential privilege boundary. Crossplane’s service account can create, update, and delete resource types installed by providers or defined by XRDs. Other kinds that a Composition needs must have suitable RBAC permissions granted. The composition guide explains using an aggregated ClusterRole and notes that the RBAC manager is optional and enabled by default. If it is disabled, teams must manually grant Crossplane access to all composed kinds, including XRs and managed resources. See Compositions · Crossplane v2.4.
- Review the exact resource kinds and verbs Crossplane can use.
- Ensure every kind used in a Composition has the required permissions.
- If disabling the RBAC manager, account for all composed kinds rather than only provider-managed resources.
Check feature maturity for the release you deploy
Crossplane’s feature flags vary by maturity: the v2.4 installation page says beta features are enabled by default and alpha features are off by default. In the documentation snapshot, real-time compositions are labeled beta and operations alpha. These labels and defaults are release-specific, so check the feature table for the version you intend to run before designing around a capability. Do not treat an alpha feature as generally available.
Quick Recap
Best Value
A practical adoption checklist
- Choose whether the immediate goal is cluster installation or local platform API development.
- Design the XRD around a consumer-facing request, and define how an XR should map to resources.
- Choose and install the providers that own the external resources your Composition needs.
- Review the Crossplane service account’s RBAC for every composed kind and required verb.
- Verify feature maturity, defaults, and installation commands against the exact Crossplane and CLI releases selected.
- For repeatable provider installs, consider pinning package images by digest and define how updates are approved.
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