Kubectl patch: Difference between revisions
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=Overview= | =Overview= | ||
<code>kubectl patch</code> supports the following modes: [[Kubernetes Strategic Merge Patch|strategic merge patch]] ("strategic"), JSON merge patch ("merge") and [[JSON_Patch|JSON patch]] ("json"). | <code>kubectl patch</code> supports the following modes: [[Kubernetes Strategic Merge Patch|strategic merge patch]] ("strategic"), [[JSON_Merge_Patch|JSON merge patch]] ("merge") and [[JSON_Patch|JSON patch]] ("json"). | ||
=Caveats= | =Caveats= | ||
Revision as of 19:10, 29 July 2021
External
- https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#patch
- https://kubernetes.io/docs/tasks/manage-kubernetes-objects/update-api-object-kubectl-patch/
Internal
Overview
kubectl patch supports the following modes: strategic merge patch ("strategic"), JSON merge patch ("merge") and JSON patch ("json").
Caveats
⚠️There are situations when the patch apparently succeeds, the kubectl patch command exits with 0 and if the resource is queried immediately, the patch seems to be applied, but when the resource is queried a while later (15 secs), it becomes apparent that the "patch" did not take. This happened while trying to unbind a PV from the PVC while the PVC is still active.
Usage Examples
Delete a Field with a JSON Patch
Unbind a PVC from a PV by deleting the PV's claimRef:
kubectl patch pv my-pv --type=json --patch='[{"op": "remove", "path": "/spec/claimRef"}]'