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K8s L5 K8S 1412 · 14 min

A Gatekeeper constraint rejects only one object kind

Most objects are validated with the new template, yet one kind still flows through a stale schema path on one control-plane node.

K8sPlatform ReliabilityLevel 5Pro14 min
Scenario

A constraint upgrade is rolled out and only one custom kind shows inconsistent admission results across clients.

What to check first
  • Identify the primary failure signal in the The Constraint Updated and One API Path Brought an Older Schema to the Meeting scenario.
  • Separate visible symptoms from the underlying technical dependency.
  • Describe the safest recovery path and the follow-up prevention work.
Checking checklist
  1. Summarize the current impact and the last known change.
  2. Collect direct evidence from logs, runtime state, and configuration before changing anything.
  3. Separate immediate recovery from permanent prevention work.
Recovery and prevention

Compare conversion paths and API server cache refreshes before disabling the constraint or force-restarting every control-plane node.

Questions worth viewing together
What should you verify first when A Gatekeeper constraint rejects only one object kind appears?

Community-field Kubernetes problem inspired by Gatekeeper and control-plane discussions where one aggregated API path still served a stale schema. Admission inconsistencies can be limited to one versioned path or kind even when the controller rollout looked healthy.

What usually causes A Gatekeeper constraint rejects only one object kind in production?

Teams often blame CRD corruption when one cached conversion path is evaluating an older schema.

What should you document after resolving A Gatekeeper constraint rejects only one object kind?

Constraint and CRD upgrades should be tested across every served version path, not just the default kubectl path.