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kubeadm upgrade plan prints "context deadline exceeded" on a cluster with external etcd. What should be done?

  1. Migrate to stacked etcd before upgrading
  2. Restart every etcd member and retry
  3. Skip the upgrade until etcd is upgraded first
  4. Proceed with kubeadm upgrade apply
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Answer: D. Proceed with kubeadm upgrade apply

The message comes from a version check older kubeadm versions perform against an external etcd cluster; it is not a critical fault and the upgrade can continue.

Source: Troubleshooting kubeadm (Kubernetes) — kubeadm upgrade plan prints out context deadline exceeded error message

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