Kubernetes API Version Checker

Check every apiVersion in a manifest against a target cluster version. This covers apiVersion and kind, which is the part that changes between releases and breaks applies, and it deliberately does not ship a field-level OpenAPI schema.

The table behind this comes from the upstream deprecated API migration guide and covers built-in kinds through 1.33.

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Examples

Real input you can load into the tool above. Each one shows a different thing going wrong, because that is what the tool is for.

A removed API

PodSecurityPolicy, gone in 1.25, checked against the target version

apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: restricted

A current manifest

A manifest already on a supported version for the chosen target

apiVersion: apps/v1
kind: Deployment
metadata:
  name: api

Common mistakes

These are the ones that fail silently. The config is accepted, nothing raises an error, and the consequence arrives later.

  1. Validating against the running version instead of the target

    The point is to catch what breaks on upgrade. Checking against today's version finds nothing.

    Instead:Set the target to the version you are moving to.

  2. Assuming a deprecated API still works

    Deprecated and removed are different. A removed API is a hard error at apply time.

    Instead:Check the removal version, not the deprecation notice.

  3. Only checking your own manifests

    Charts, operators and vendored YAML carry old apiVersions too.

    Instead:Render everything that gets applied, then check the output.

Why this is not a field-level schema check

A per-version field check means shipping megabytes of OpenAPI and being wrong whenever your cluster differs from the copy bundled here. The apiVersion half is what breaks applies between releases, and it fits in a small table that can be right.

PodSecurityPolicy is the one with nowhere to go

Every other removal on this list is a move to a new group or version. PSP was deleted in 1.25 with no successor object, so a cluster upgrading past it loses the enforcement silently. Pod Security Admission replaced it and is configured with labels on the Namespace rather than as an object you apply.

PodDisruptionBudget inverted an empty selector

policy/v1beta1 matched no pods with an empty selector; policy/v1 matches every pod in the namespace. The same object therefore reverses meaning across the 1.25 removal, going from protecting nothing to blocking every eviction, which stops node drains cluster-wide. The object is valid in both versions, so nothing warns.

What this cannot see

Fields, which `kubectl apply --dry-run=server` checks against your actual cluster including its webhooks and CRDs. Custom resources, whose versions belong to whoever wrote the CRD. And anything removed after 1.33, until somebody adds it here.

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