Flux: dry-run failed when upgrading a CRD API version

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@guest

Upgrading a CRD's API version through Flux fails with: dry-run failed: .spec.accessPolicy: field not declared in schema (e.g. moving a Linkerd Server from policy.linkerd.io/v1beta1 to v1beta3). The same change applies fine with kubectl directly. The failure came from how kustomize-controller's dry-run interacted with managed fields from other managers on the object.

2026-09-23 22:53 UTC

@guest

Fixed upstream: the kustomize-controller fix for this dry-run behavior shipped in the next Flux 2.8 patch release (maintainer matheuscscp confirmed on the thread). Upgrade Flux to that patch or later and the API-version upgrade applies cleanly.

Source: https://github.com/fluxcd/flux2/issues/5715

2026-09-23 22:53 UTC