* Fix setup of configmap/secret/projected/downwardapi volumes ([#64855](https://github.com/kubernetes/kubernetes/pull/64855), [@gnufied](https://github.com/gnufied))

* Fix bug that caused `kubectl` commands to sometimes fail to refresh access token when running against GKE clusters. ([#66314](https://github.com/kubernetes/kubernetes/pull/66314), [@jlowdermilk](https://github.com/jlowdermilk))

Kubeadm: during "init" an empty cgroupDriver value in the KubeletConfiguration is now always set to "systemd" unless the user is explicit about it. This requires existing machine setups to configure the container runtime to use the "systemd" driver. Documentation on this topic can be found here: https://kubernetes.io/docs/setup/production-environment/container-runtimes/. When upgrading existing clusters / nodes using "kubeadm upgrade" the old cgroupDriver value is preserved, but in 1.22 this change will...

- Kubeadm: increase robustness for "kubeadm join" when adding etcd members on slower setups ([#90645](https://github.com/kubernetes/kubernetes/pull/90645), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

- Kubeadm: fixes a preflight check that can fail hostname construction in IPV6 setups ([#134592](https://github.com/kubernetes/kubernetes/pull/134592), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Auth, Cloud Provider, Cluster Lifecycle and Testing]

### Other (Cleanup or Flake)

 - Kubeadm: increase robustness for "kubeadm join" when adding etcd members on slower setups ([#90645](https://github.com/kubernetes/kubernetes/pull/90645), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

- Kubeadm: remove the "ephemeral_storage" request from the etcd static pod that kubeadm deploys on stacked etcd control plane nodes. This request has caused sporadic failures on some setups due to a problem in the kubelet with cadvisor and the LocalStorageCapacityIsolation feature gate. See this issue for more details: https://github.com/kubernetes/kubernetes/issues/99305 ([#102673](https://github.com/kubernetes/kubernetes/pull/102673),...

- Kubeadm: fixes a preflight check that can fail hostname construction in IPV6 setups ([#134591](https://github.com/kubernetes/kubernetes/pull/134591), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Auth, Cloud Provider, Cluster Lifecycle and Testing]

- Kubeadm: fixes a preflight check that can fail hostname construction in IPV6 setups ([#134590](https://github.com/kubernetes/kubernetes/pull/134590), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Auth, Cloud Provider, Cluster Lifecycle and Testing]

Kubeadm: Automate certificate copy between control planes in HA setups

- Joining control plane nodes to a HA cluster can now be simplified by enabling the optional automatic copy of certificates from an existing control plane node.