- Added a new `--init-only` command line flag to `kube-proxy`. Setting the flag makes `kube-proxy` perform its initial configuration that requires privileged mode, and then exit. The `--init-only` mode is intended to be executed in a privileged init container, so that the main container may run with a stricter `securityContext`. ([#120864](https://github.com/kubernetes/kubernetes/pull/120864),...

  // CHECK-NEXT: mhlo.constant dense<[0, 1, 2]> : tensor<3xi64>
  // CHECK-NEXT: %[[cgrad:.*]] = mhlo.convert %[[grad]] : tensor<8x8x8x8xf32>
  // CHECK-NEXT: %[[init2:.*]] = mhlo.constant dense<-0.000000e+00> : tensor<f32>
  // CHECK-NEXT: %[[red2:.*]] = mhlo.reduce(%[[cgrad]] init: %[[init2]]) applies mhlo.add across dimensions = [0, 1, 2] : (tensor<8x8x8x8xf32>, tensor<f32>) -> tensor<8xf32>

Once all regular containers have completed, all init containers with restartPolicy \"Always\" will be shut down. This lifecycle differs from normal init containers and is often referred to as a \"sidecar\" container. Although this init container still starts in the init container sequence, it does not wait for the container to complete before proceeding to the next init container. Instead, the next init container starts immediately after this init container is started, or after any startupProbe has...

		default:
			// These fields are disallowed for init containers.
			if ctr.Lifecycle != nil {
				allErrs = append(allErrs, field.Forbidden(idxPath.Child("lifecycle"), "may not be set for init containers without restartPolicy=Always"))
			}
			if ctr.LivenessProbe != nil {
				allErrs = append(allErrs, field.Forbidden(idxPath.Child("livenessProbe"), "may not be set for init containers without restartPolicy=Always"))
			}

	// containers have completed, all init containers with restartPolicy "Always"
	// will be shut down. This lifecycle differs from normal init containers and
	// is often referred to as a "sidecar" container. Although this init
	// container still starts in the init container sequence, it does not wait
	// for the container to complete before proceeding to the next init
	// container. Instead, the next init container starts immediately after this

statically to `IfNotPresent` for all required images. If you want to always pull the latest images before cluster init (as `Always` would do), run `kubeadm config images pull` before each `kubeadm init`. If you don't want the kubelet to pull any images at `kubeadm init` time, for example if you don't have an internet connection, you can also run `kubeadm config images pull` before `kubeadm init` or side-load the images some other way (such as `docker load -i image.tar`). Having the images locally cached...

- 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.
- You can now use `kubeadm init --experimental-upload-certs` and `kubeadm join --experimental-control-plane --certificate-key`.
kubernetes/kubeadm: [#1373](https://github.com/kubernetes/kubeadm/issues/1373)

 - Fix HPA when using init containers and CRI-O ([#90901](https://github.com/kubernetes/kubernetes/pull/90901), [@joelsmith](https://github.com/joelsmith)) [SIG Node]
 - Fix flaws in Azure CSI translation ([#90325](https://github.com/kubernetes/kubernetes/pull/90325), [@andyzhangx](https://github.com/andyzhangx)) [SIG Cloud Provider]

  // List of initialization containers belonging to the pod.
  // Init containers are executed in order prior to containers being started. If any
  // init container fails, the pod is considered to have failed and is handled according
  // to its restartPolicy. The name for an init container or normal container must be
  // unique among all containers.

          imagePullPolicy: IfNotPresent
          command: ["calico-node", "-init", "-best-effort"]
          volumeMounts:
            - mountPath: /sys/fs
              name: sys-fs
              # Bidirectional is required to ensure that the new mount we make at /sys/fs/bpf propagates to the host
              # so that it outlives the init container.
              mountPropagation: Bidirectional