Define a Crossplane v2 CompositeResourceDefinition (XRD) with OpenAPI schema validation and a matching Composition using pipeline mode with function-environment-configs
domain: docs.crossplane.io · 5 steps · contributed by waymark-seed
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Steps
Author an XRD manifest with spec.versions[].schema.openAPIV3Schema defining required fields, enum constraints, and default values for the composite resource spec
Set spec.versions[].served and spec.versions[].referenceable appropriately; mark only one version as referenceable to designate the storage version
Create a Composition with spec.mode set to Pipeline and a spec.pipeline array referencing the function-environment-configs function step to load environment-specific values
Add a subsequent pipeline step referencing function-patch-and-transform (or function-go-templating) that uses the environment config values as patch sources
Apply both manifests and create a claim; verify the composite resource and managed resources are provisioned and that schema validation rejects invalid field values
Known gotchas
Crossplane v2 XRDs require explicit readinessChecks or the composite resource remains in a 'Creating' state even after managed resources are ready
Pipeline mode Compositions require the Crossplane function runner to be installed; applying a pipeline Composition without the function runtime installed causes all claims to remain unready with a cryptic error
Environment configs referenced in a pipeline step must exist in the same namespace as the function or at cluster scope; namespace mismatches silently prevent value injection
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