Make it possible to use custom GCS with environment variables

[afbjorklund]

I know that "localkube" is deprecated, and that there are no official versions of localkube since v1.8.0:
#2134

But since the list of releases is hardcoded, I can't make any custom localkube builds (of 1.8.x) either:
#2156

Plan to move to "kubeadm" eventually (1.9+), but am not ready to do it for kubernetes version 1.8

And besides, using docker-machine and localkube still works fine - unless it is hardcoded/blocked...

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[minikube-bot]

Can one of the admins verify this patch?

[afbjorklund]

CLA signed

[r2d4]

@afbjorklund you can already pass in a file or url to kubernetes version for localkube

--kubernetes-version=https://...
or
--kubernetes-version=file:///home/matt/localkube

[afbjorklund]

@r2d4 : that was one of the first things that I tried, but it doesn't seem to work - just got errors.

E1231 09:14:10.402682    5074 start.go:182] Error parsing version semver:  No Major.Minor.Patch elements found
Kubernetes version downgrade is not supported. Using version: v1.8.0

So using the pre-populated cache was a workaround, which worked OK (for v1.8.0, not v1.8.4)

[afbjorklund]

The previous version (0.23) just said:

Invalid Kubernetes version.
The following Kubernetes versions are available: 
	- v1.8.0
	- v1.7.5
	- v1.7.4
	...

[dlorenc]

@afbjorklund what string did you try passing as a flag to get that error?

[afbjorklund]

@dlorenc : Something like --kubernetes-version=file:///mnt/sda1/tmp/localkube

[r2d4]

I think that this was a regression in 0.23.0 but fixed at HEAD. Especially since we use the flag in this way for integration tests

https://github.com/kubernetes/minikube/blob/master/hack/jenkins/linux_integration_tests_virtualbox.sh#L32

[afbjorklund]

Am running 0.24.1, maybe should have said that.

[afbjorklund]

Hmm, git says c20ebde was included in 0.24.0 already...
Maybe I forgot the file:// before the path or something ?

Now when I retry same thing with minikube 0.24.1, it does say:
Starting local Kubernetes file:///tmp/localkube cluster...

[dlorenc]

What's the status here? Can this be closed?

[afbjorklund]

@dlorenc : I guess that if you wanted to run e.g. 1.8.7 or 1.9.2 that you would "have" to use something like this since the default list of localkubes is still hardcoded to 1.8.0 and 1.9.0.

But using an URL seems to be working (as a workaround), even if it spews some "semver" errors when trying to parse the URL. Seems to be choking on the first path of the url/path ?

Error parsing version semver: Invalid character(s) found in major number "file:///home/anders/"

But I suppose we could patch it downstream, so you can just close it if you like.

[afbjorklund]

It would be nice if this could be merged, since the syntax is much nicer and having validation is good...
It is not supposed to break anything, if you want the defaults and don't set the environment variables ?

MINIKUBE_LOCALKUBE_GCS=https://storage.googleapis.com/minikube/k8s_releases.json
MINIKUBE_LOCALKUBE_URL=https://storage.googleapis.com/minikube/k8sReleases/

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[dlorenc]

Is this still needed? Localkube is on the way out. Please reopen if you think it should be included still.

[afbjorklund]

It was used for previous kubernetes releases, but like you say it is not useful without localkube.
So I guess I will just keep the patch downstream, and then switch to using kubeadm instead...