Possible to do a "dry run" validation of files?

Question

Before creating an object in Kubernetes (Service, ReplicationController, etc.), I'd like to test that the JSON or YAML specification of the object is valid. But I don't want to actually create the object.

Is there some to do a "dry run" that would be equivalent to running kubectl create --validate=true -f file.json, but would just let me know that it passes validation, and not actually create it?

Ideally, it would be great if I could do this via API, and not require the use of kubectl. But I could make it work if it required me to use kubectl.

Thanks.

Answer 1

This works for me (kubernetes 1.7 and 1.9):

kubectl apply --validate=true --dry-run=client --filename=file.yaml 

Answer 2

Some kubectl commands support a --dry-run flag (like kubectl run, kubectl expose, and kubectl rolling-update).

There is an issue open to add the --dry-run flag to more commands.