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Merge pull request #23658 from thtanaka/docs/kubeadm-reset 

kubeadm reset unmounts /var/lib/kubelet
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Kubernetes Prow Robot 2020-09-02 20:25:40 -07:00 committed by GitHub
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10
content/en/docs/setup/production-environment/tools/kubeadm/troubleshooting-kubeadm.md
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@ -407,4 +407,12 @@ be advised that this is modifying a design principle of the Linux distribution.
This error message is shown when upgrading a Kubernetes cluster with `kubeadm` in the case of running an external etcd. This is not a critical bug and happens because older versions of kubeadm perform a version check on the external etcd cluster. You can proceed with `kubeadm upgrade apply ...`.
This issue is fixed as of version 1.19.
This issue is fixed as of version 1.19.
## `kubeadm reset` unmounts `/var/lib/kubelet`
If `/var/lib/kubelet` is being mounted, performing a `kubeadm reset` will effectively unmount it.
To workaround the issue, re-mount the `/var/lib/kubelet` directory after performing the `kubeadm reset` operation.
This is a regression introduced in kubeadm 1.15. The issue is fixed in 1.20.