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📖 Update CAPI support and guarantees for v1.7 #9867

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Dec 14, 2023
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📖 Update CAPI support and guarantees for v1.7 #9867

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1 change: 1 addition & 0 deletions CONTRIBUTING.md
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Expand Up @@ -166,6 +166,7 @@ Cluster API maintains the most recent release/releases for all supported API and

| Minor Release | API Version | Supported Until |
|---------------|--------------|-----------------------------------------------------|
| v1.7.x | **v1beta1** | when v1.9.0 will be released |
| v1.6.x | **v1beta1** | when v1.8.0 will be released |
| v1.5.x | **v1beta1** | when v1.7.0 will be released |
| v1.4.x | **v1beta1** | EOL since 2023-12-05 - v1.6.0 release date |
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59 changes: 24 additions & 35 deletions docs/book/src/reference/versions.md
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Expand Up @@ -72,61 +72,50 @@ These diagrams show the relationships between components in a Cluster API releas

#### Core Provider (`cluster-api-controller`)

| | v1.3 (v1beta1) (EOL) | v1.4 (v1beta1) | v1.5 (v1beta1) | v1.6 (v1beta1) |
| | v1.4 (v1beta1) (EOL) | v1.5 (v1beta1) | v1.6 (v1beta1) | v1.7 (v1beta1) |
|-------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.18 | ✓ (only workload) | | | |
| Kubernetes v1.19 | ✓ (only workload) | | | |
| Kubernetes v1.20 | ✓ | | | |
| Kubernetes v1.21 | ✓ | ✓ (only workload) | | |
| Kubernetes v1.22 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.23* | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.24 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.25 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.21 | ✓ (only workload) | | | |
| Kubernetes v1.22 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.23* | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.24 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.25 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.26 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.27 | | ✓ | ✓ | ✓ |
| Kubernetes v1.28 | | | ✓ | ✓ |
| Kubernetes v1.27 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.28 | | ✓ | ✓ | ✓ |


\* There is an issue with CRDs in Kubernetes v1.23.{0-2}. ClusterClass with patches is affected by that (for more details please see [this issue](https://github.com/kubernetes-sigs/cluster-api/issues/5990)). Therefore we recommend to use Kubernetes v1.23.3+ with ClusterClass.
Previous Kubernetes **minor** versions are not affected.

\** When using CAPI v1.2 or v1.3 with the CLUSTER_TOPOLOGY experimental feature on, the Kubernetes Version for the management cluster must be >= 1.22.0.

The Core Provider also talks to API server of every Workload Cluster. Therefore, the Workload Cluster's Kubernetes version must also be compatible.

#### Kubeadm Bootstrap Provider (`kubeadm-bootstrap-controller`)

| | v1.3 (v1beta1) (EOL) | v1.4 (v1beta1) | v1.5 (v1beta1) | v1.6 (v1beta1) |
| | v1.4 (v1beta1) (EOL) | v1.5 (v1beta1) | v1.6 (v1beta1) | v1.7 (v1beta1) |
|------------------------------------|----------------------|--------------------|--------------------|--------------------|
| Kubernetes v1.18 + kubeadm/v1beta2 | ✓ (only workload) | | | |
| Kubernetes v1.19 + kubeadm/v1beta2 | ✓ (only workload) | | | |
| Kubernetes v1.20 + kubeadm/v1beta2 | ✓ | | | |
| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ (only workload) | | |
| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ (only workload) | | | |
| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.26 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.27 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.28 + kubeadm/v1beta3 | | | ✓ | ✓ |
| Kubernetes v1.27 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.28 + kubeadm/v1beta3 | | ✓ | ✓ | ✓ |

The Kubeadm Bootstrap Provider generates kubeadm configuration using the API version recommended for the target Kubernetes version.

#### Kubeadm Control Plane Provider (`kubeadm-control-plane-controller`)

| | v1.3 (v1beta1) (EOL) | v1.4 (v1beta1) | v1.5 (v1beta1) | v1.6 (v1beta1) |
| | v1.4 (v1beta1) (EOL) | v1.5 (v1beta1) | v1.6 (v1beta1) | v1.7 (v1beta1) |
|----------------------------|----------------------|-------------------|-------------------|-------------------|
| Kubernetes v1.18 + etcd/v3 | ✓ (only workload) | | | |
| Kubernetes v1.19 + etcd/v3 | ✓ (only workload) | | | |
| Kubernetes v1.20 + etcd/v3 | ✓ | | | |
| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ (only workload) | | |
| Kubernetes v1.22 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.25 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.21 + etcd/v3 | ✓ (only workload) | | | |
| Kubernetes v1.22 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ (only workload) | ✓ (only workload) | |
| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
| Kubernetes v1.25 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
| Kubernetes v1.26 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.27 + etcd/v3 | | ✓ | ✓ | ✓ |
| Kubernetes v1.28 + etcd/v3 | | | ✓ | ✓ |
| Kubernetes v1.27 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
| Kubernetes v1.28 + etcd/v3 | | ✓ | ✓ | ✓ |

The Kubeadm Control Plane Provider talks to the API server and etcd members of every Workload Cluster whose control plane it owns. It uses the etcd v3 API.

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