Diffing Local and Remote Resources
TL;DR
- View diff of changes before they are Applied to the cluster
Diffing Local and Cluster State
Motivation
The ability to view what changes will be made before applying them to a cluster can be useful.
Generating a Diff
Use the diff program in a user’s path to display a diff of the changes that will be
made by Apply.
kubectl diff -k ./dir/
Setting the Diff Program
The KUBECTL_EXTERNAL_DIFF environment variable can be used to select your own diff command.
By default, the “diff” command available in your path will be run with “-u” (unified) and “-N”
(treat new files as empty) options.
export KUBECTL_EXTERNAL_DIFF=meld; kubectl diff -k ./dir/
Exit status
The following exit values shall be returned:
0
No differences were found.
1
Differences were found.
>1
Kubectl or diff failed with an error.
Note: KUBECTL_EXTERNAL_DIFF, if used, is expected to follow that convention.
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