Server-side dry-run support for live preview about cli-utils

[seans3]

Hi @fsommar . Server-side dry-run requires an APIServer version >= 1.16 (it requires server-side apply which is turned on by default in 1.16). Since we can not assume the APIServer version is >= 1.16 (e.g. GKE is in the range of 1.14 - 1.16, with 1.17 as the rapid channel), we must continue to use client-side apply functionality. Once we can rely on server-side apply, we will change kpt live apply and kpt live preview to use server-side apply. I'm going to close this issue shortly.

[seans3]

...as far as the change needed (once we intend to make it), the import of kubectl does not need to change (since it is about 1.18). But we'll need to update the ApplyOptions to fill in the server-side flags.

[fsommar]

Ok, that makes sense. I saw that there were some server-side-apply-related flags, and figured that maybe at least the server-side dry-run could be exposed as a hidden flag? I created a PR for this in case that'd be an acceptable short-term fix.

[fejta-bot]

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[fsommar]

I'll close this and then revisit it in the future when GKE is on more recent versions of Kubernetes.

/close

[k8s-ci-robot]

@fsommar: Closing this issue.

In response to this:

I'll close this and then revisit it in the future when GKE is on more recent versions of Kubernetes.

/close

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