Automatic merge from submit-queue (batch tested with PRs 50832, 51119, 51636, 48921, 51712)
kubeadm: Add support for using an external CA whose key is never stored in the cluster
We allow a kubeadm user to use an external CA by checking to see if ca.key is missing and skipping cert checks and kubeconfig generation if ca.key is missing. We also pass an empty arg --cluster-signing-key-file="" to kube controller manager so that the csr signer doesn't start.
**What this PR does / why we need it**:
This PR allows the kubeadm certs phase and kubeconfig phase to be skipped if the ca.key is missing but all other certs are present.
**Which issue this PR fixes** :
Fixes kubernetes/kubeadm/issues/280
**Special notes for your reviewer**:
@luxas @mikedanese @fabriziopandini
**Release note**:
```release-note
kubeadm: Add support for using an external CA whose key is never stored in the cluster
```
Automatic merge from submit-queue
kubeadm: Add node-cidr-mask-size to pass to kube-controller-manager for IPv6
Due to the increased size of subnets with IPv6, the node-cidr-mask-size needs to be passed to kube-controller-manager. If IPv4 it will be set to 24 as it was previously, if IPv6, it will be set to
64
**What this PR does / why we need it**:
If the user specifies the --pod-network-cidr with kubeadm init, this caused the kube-controller-manager manifest to include the "--allocate-node-cidrs" and "--cluster-cidr" flags to be set. The --node-cidr-mask-size is not set, and currently defaults to 24, which is fine for IPv4, but not appropriate for IPv6. This change passes the a value as the node-cidr-mask-size to the controller-manager. It detects if it is IPv4 or v6, and sets --node-cidr-mask-size to 24 for IPv4 as before, and to 64 for IPv6.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#50469
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
We allow a kubeadm user to use an external CA by checking to see if ca.key is missing and skipping cert checks and kubeconfig generation if ca.key is missing.
Due to the increased size of subnets with IPv6, the node-cidr-mask-size needs to be passed to kube-controller-manager. If the user passes a IPv6 cidr, the node-cidr-mask-size will be set to 64, If IPv4 it will be set to 24 as it was previously.
Automatic merge from submit-queue
kubeadm: Centralize commonly used paths/constants to the constants pkg
**What this PR does / why we need it**:
Before there were constants defined for the control plane components in three different places:
- images
- phases/controlplane
- phases/selfhosting
Now they are in one centralized place. I also moved funcs for building common paths to that lib.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Dependency for: https://github.com/kubernetes/kubernetes/pull/48899
**Special notes for your reviewer**:
Most of this PR really is autogenerated with a replace tool. I tested this and things work just normally as well.
**Release note**:
```release-note
NONE
```
@timothysc @dmmcquay @pipejakob @kubernetes/sig-cluster-lifecycle-pr-reviews
