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

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"}]'