GCE: use n2-standard-2 machine type

[aslafy-z]

Change description

N1 machines are less and less available. I could not build my image in multiple zones of european regions. N2 seams to be more available.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @aslafy-z. Thanks for your PR.

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[drew-viles]

Hi,

I'm not seeing anything from Google to suggest there is a removal of N1 instances happening anywhere and it's still listed in their workload types. The N1 machines are generally cheaper to run which is why this option was set originally I suspect - Though in Europe it looks to be the same now tbh.

You can override this via your own configuration file too so I'd recommend taking that approach for now: https://github.com/kubernetes-sigs/image-builder/blob/main/docs/book/src/capi/capi.md

PACKER_VAR_FILES=var_file_1.json make ...

I mean, I'm no GCE expert for what it's worth so happy to be told otherwise! 😄

[AverageMarcus]

Yeah I think I agree with @drew-viles on this unless there is actual indication that the n1 series is being phased out.

The price difference is quite a lot and could be a surprise for users that use the defaults and builds a lot of images. n1-standard-1 - $0.055 n2-standard-2 - $0.133382

As Drew points out, machine_type can be provided in the user vars to override this value.

Maybe we could get away with just updating the GCP docs to point this out specifically?

[aslafy-z]

Thank you for the feedback! I opened https://github.com/kubernetes-sigs/image-builder/pull/1608 to update the documentation. Closing this PR.