Kubectl patch: Difference between revisions

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=External=
=External=
* https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#patch
* https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#patch
* https://kubernetes.io/docs/tasks/manage-kubernetes-objects/update-api-object-kubectl-patch/
=Internal=
=Internal=
* [[Kubectl#Commands|kubectl]]
* [[Kubectl#Commands|kubectl]]

Revision as of 17:40, 29 July 2021

External

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"}]'