kubeadm: consider use --lazy option for unconnected nfs server when cleanup node mountpoints

[zhangzhiqiangcs]

What would you like to be added?

kubeadm cleanup load try --lazy option when encounting umount nfs error.
umount reference: https://linux.die.net/man/8/umount

Why is this needed?

The kubeadm command may hangs if the node can not connect to nfs server

[k8s-ci-robot]

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[zhangzhiqiangcs]

/sig cluster-lifecycle

[neolit123]

/transfer kubeadm

[neolit123]

please add more details to the description.

where is this --lazy flag supposed to be added?
is it for "kubeadm reset"?

if yes, then maybe this is a related issue:
#2923

and PR:
kubernetes/kubernetes#120377

[zhangzhiqiangcs]

please add more details to the description.

where is this --lazy flag supposed to be added? is it for "kubeadm reset"?

if yes, then maybe this is a related issue: #2923

and PR: kubernetes/kubernetes#120377

This issue and PR seems is just what I looked for. Thanks @neolit123

[neolit123]

ok, we can close this one.
that PR is blocked because we did not agree on how to do the change exactly so that it does not break users.