k8s v1.15-beta1: kubelet: unknown flag: --allow-privileged

[tstromberg]

If minikube start --kubernetes-version=v1.15.0-beta.1 is used, a failure occurs:

Unfortunately, an error has occurred:
	timed out waiting for the condition

This error is likely caused by:
	- The kubelet is not running
	- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)

If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:
	- 'systemctl status kubelet'
	- 'journalctl -xeu kubelet'

Additionally, a control plane component may have crashed or exited when started by the container runtime.
To troubleshoot, list all containers using your preferred container runtimes CLI, e.g. docker.
Here is one example how you may list all Kubernetes containers running in docker:
	- 'docker ps -a | grep kube | grep -v pause'
	Once you have found the failing container, you can inspect its logs with:
	- 'docker logs CONTAINERID'

: Process exited with status 1

😿  Sorry that minikube crashed. If this was unexpected, we would love to hear from you:
👉  https://github.com/kubernetes/minikube/issues/new
❌  Problems detected in "kubelet":
    May 29 18:23:32 k8s115 kubelet[2944]: F0529 18:23:32.984077    2944 server.go:156] unknown flag: --allow-privileged

[tstromberg]

Deprecation notice for this flag: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.15.md#action-required

If anyone wants to fix support for v1.15, here is where to get started:

minikube/pkg/minikube/bootstrapper/kubeadm/versions.go

Line 245 in 6bc6c3f

NewUnversionedOption(Kubelet, "allow-privileged", "true"),

This will need to be changed to a NewUnversionedOption() so that it isn't set for v1.15+. If Kubernetes v1.15.0-beta1 is working properly, the PR should also update NewestKubernetesVersion so that this release is tested in our integration tests:

minikube/pkg/minikube/constants/constants.go

Line 168 in b64f62c

var NewestKubernetesVersion = "v1.14.2"

[blueelvis]

Am I correct in understanding that I would have to remove the above line 245 which you have mentioned and add code similar to this

minikube/pkg/minikube/bootstrapper/kubeadm/versions.go

Line 257 in 16af8b4

{

so that this is set only for versions which support it? (Basically setting the LessThanOrEqual

[fenglixa]

I would like to provide PR for this ticket. Thanks @blueelvis @tstromberg

[the-redback]

Kubernetes-1.15.0 unable to run on minikube 1.1.1 as this error still exists on last release.
Is there any early plan of release? @tstromberg

[fenglixa]

@the-redback Let me check.

[fenglixa]

With latest code, minikube could start kubenetes-1.15.0 successfully, as below my test result:

@the-redback I am worried the fixes was not in the build you are using, wish you could help double check. Thanks.

[tstromberg]

@the-redback - minikube v1.2.0 with v1.15.0 support will be published this week.

If you build from source code, v1.15.0 will work fine.