Glossary

Terms used across the Crossplane course. Course-specific vocabulary lives here so lessons can link to a single definition instead of redefining terms. For Pico-side vocabulary (Rule, Parser, Composer, Pico), see the Pico course glossary.

Composition

A Crossplane resource that declares how one or more Managed Resources are created from a higher-level Composite Resource. Compositions are how a Pico becomes a runnable object on Kubernetes in this course.

Composite Resource (XR)

A user-defined Kubernetes resource whose contents are produced by a Composition. In this course, hello-world-pico is expressed as a Composite Resource that a Composition resolves to concrete Kubernetes objects.

Control plane

The set of Kubernetes controllers that reconcile declared state against the actual state of the cluster. Crossplane extends this control plane with its own controllers for cloud- and platform-managed resources.

Crossplane

An open-source Kubernetes add-on that lets you declaratively manage infrastructure and platform APIs using the same Kubernetes control plane that runs workloads. Crossplane is the layer through which this course runs Hello Pico on Kubernetes.

Managed Resource

A Kubernetes representation of an external resource managed by Crossplane. Compositions turn Composite Resources into Managed Resources.

minikube

The local single-node Kubernetes environment used as the reference target for the Crossplane lab. It is small enough to run on a laptop and matches the runnable-contract expectations for local verification.

Provider

A Crossplane package that adds support for a specific set of Managed Resources (for example, the Kubernetes Provider used in this course to compose in-cluster resources).