Option to skip kubeadm preflight checks

[maingoh]

FEATURE REQUEST

Since a new docker version has been released and is not validated, the preflight checks raise an error and prevent minikube to start. This would be nice if we could add a custom --ignore-preflight-errors to kubeadm, currently hardcoded here:

minikube/pkg/minikube/constants/constants.go

Line 149 in ae9f4b2

var Preflights = []string{

Also eventually override or remove the default ones depending on the environnement.

• Minikube version: v0.28.2
• OS : Ubuntu 18.04.1
• VM Driver: none

[balopat]

This sounds like a good idea for advanced usage, since the issue is going to be around for a while.
cc #3323

[thomas-riccardi]

It's indeed related to #3323: the fix (kubernetes/kubernetes#71001) will probably only be included in kubernetes >= 1.13: since kubeadm provides a facility to ignore preflight errors there is no strict need to backport the fix to earlier kubernetes versions.

[afbjorklund]

Probably only valid for the "none" driver, since the various minikube.iso are supposed to pass checks.

Note that there are already quite a long list of "supported" ignores, such as that pesky old swap partition...

[tstromberg]

FWIW, I'd be happy to review any PR which introduces this option.

[marcosdiez]

@tstromberg your wishes came true. here is the PR: #3879

It actually allows one to pass generic commands to kubeadm

so this is what has to be executed:

sudo -E minikube start --vm-driver=none --kubernetes-version v1.11.8 --extra-config kubeadm.ignore-preflight-errors=SystemVerification

[jbcpollak]

For anyone running into issues with @marcosdiez 's solution, there is a small typo. You need to include an = as shown below:

sudo minikube start --vm-driver=none --extra-config=kubeadm.ignore-preflight-errors=SystemVerification

[tstromberg]

This was fixed a while back: --extra-config kubeadm.ignore-preflight-errors=SystemVerification