- Improved air-gapped and offline support
  - kubeadm now handles air-gapped environments by using the local client version as a fallback.
  - Some kubeadm commands are now allowed to work in a completely offline mode.
- Certificate handling improvements:
  - Renew certs as part of upgrade.
  - New `kubeadm alpha phase certs renew` command for renewing certificates.

* **[alpha]** New Bootstrap Token authentication and management method. Works well with kubeadm. kubeadm now supports managing tokens, including time based expiration, after the cluster is launched.  See [kubeadm reference...

- Kubeadm: deprecate self-hosting support. The experimental command "kubeadm alpha self-hosting" is now deprecated and will be removed in a future release. ([#95125](https://github.com/kubernetes/kubernetes/pull/95125), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

- kubeadm: added the `WaitForAllControlPlaneComponents` feature gate. It could be used to tell kubeadm to wait for all control plane components to be ready when running "kubeadm init" or "kubeadm join --control-plane". Previously, kubeadm only waited for the kube-apiserver. The "kubeadm join" workflow now includes a new experimental phase called "wait-control-plane". This phase was marked as non-experimental...

- Kubeadm: `kubeadm config view` command has been deprecated and will be removed in a feature release, please use `kubectl get cm -o yaml -n kube-system kubeadm-config` to get the kubeadm config directly ([#92740](https://github.com/kubernetes/kubernetes/pull/92740), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

- Fix error handling and potential go null pointer exception in kubeadm upgrade diff ([#80648](https://github.com/kubernetes/kubernetes/pull/80648), [@odinuge](https://github.com/odinuge))
- kubeadm: fall back to client version in case of certain HTTP errors ([#80024](https://github.com/kubernetes/kubernetes/pull/80024), [@RainbowMango](https://github.com/RainbowMango))

```
apiVersion: [kubeadm.k8s.io/v1alpha1](http://kubeadm.k8s.io/v1alpha1)
kind: MasterConfiguration
kubernetesVersion: v1.9.1
noTaintMaster: true
```

And point to the file using the --config flag, as in

`kubeadm init --config /etc/kubeadm/kubeadm.yaml`

- Kubeadm: deprecated command "alpha selfhosting pivot" is now removed. ([#97627](https://github.com/kubernetes/kubernetes/pull/97627), [@knight42](https://github.com/knight42))

- Kubeadm: add support for dry running "kubeadm reset". The new flag "kubeadm reset --dry-run" is similar to the existing flag for "kubeadm init/join/upgrade" and allows you to see what changes would be applied. ([#107512](https://github.com/kubernetes/kubernetes/pull/107512), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

- Kubeadm: add support for dry running `kubeadm join`. The new flag `kubeadm join --dry-run` is similar to the existing flag for `kubeadm init/upgrade` and allows you to see what changes would be applied. ([#103027](https://github.com/kubernetes/kubernetes/pull/103027), [@Haleygo](https://github.com/Haleygo))