Update the docker version to maximum validated version 18.06 about kind

[BenTheElder]

Done in #89

[BenTheElder]

/cc @munnerz
Probably we should also consider switching to an Ubuntu base image too so that:

• we can use newer systemd without hacks
• we don't circularly depend on an image from k/k
• we can use the Ubuntu guides for install
  ... But still use the Debian package logic we have setup.

I think the 18.04 image should be small enough.

This docker version was the main reason for using debian-base. We used that one due to validation from sig-node, but I agree we should upgrade 👍

/assign
/kind cleanup
/lifecycle active

[neolit123]

Update the docker version to maximum validated version 18.06

validated by k8s consumers and contributors.
AFAIK sig-node will no longer do the validation process they were doing for previous releases.

[warmchang]

AFAIK sig-node will no longer do the validation process they were doing for previous releases.

The PR kubernetes/test-infra#9444 in project test-infra added Docker 18.06 to the CI tests.

And an other PR kubernetes/test-infra#9379 from BenTheElder upgraded docker in bootsrap to 18.06 (Please ignore the comment and issue 6187 has been fixed.):

https://github.com/kubernetes/test-infra/blob/f97e35a467fdfbc3bb50fed8d5be9328cf62c02a/images/bootstrap/Dockerfile#L102

[neolit123]

yes, i saw these when they merged, we do have 18.06 test signal.
but it's not the same sig-node validation.

[warmchang]

ok, I understand.

[BenTheElder]

Yep, that's something else entirely, I have some work that includes this though, will PR later today.