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Merge pull request #8520 from furkatgofurov7/update-version-doc-k8s-1-27
📖 Update versions doc with k8s v1.27 notes
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‎docs/book/src/reference/versions.md‎

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@@ -24,10 +24,10 @@ When a new Kubernetes minor release is available, we will try to support it in a
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the corresponding required changes in Cluster API are too invasive we won't backport the support and users have to wait
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for the next Cluster API minor release.
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For example, Cluster API v1.4.0 would support the following Kubernetes versions:
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* v1.23.x to v1.26.x for the management cluster
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* v1.21.x to v1.26.x for the workload cluster
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* When Kubernetes 1.27 is released, it will be supported in v1.4.x (but not in v1.3.x)
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For example, Cluster API v1.5.0 would support the following Kubernetes versions:
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* v1.24.x to v1.27.x for the management cluster
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* v1.22.x to v1.27.x for the workload cluster
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* When Kubernetes 1.28 is released, it will be supported in v1.5.x (but not in v1.4.x)
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Support in this context means that we:
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* maintain corresponding code paths
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| Kubernetes v1.18 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.19 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.20 | ✓ | ✓ | | |
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| Kubernetes v1.21 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.21 | ✓ | ✓ | ✓ (only workload) | |
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| Kubernetes v1.22 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23* | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.23* | ✓ | ✓ | ✓ | ✓ (only workload) |
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| Kubernetes v1.24 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 | | | ✓ | ✓ |
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\* 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.
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| Kubernetes v1.18 + kubeadm/v1beta2 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.19 + kubeadm/v1beta2 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.20 + kubeadm/v1beta2 | ✓ | ✓ | | |
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| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.21 + kubeadm/v1beta2 | ✓ | ✓ | ✓ (only workload) | |
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| Kubernetes v1.22 + kubeadm/v1beta3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.23 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ (only workload) |
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| Kubernetes v1.24 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 + kubeadm/v1beta3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 + kubeadm/v1beta3 | | | ✓ | ✓ |
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The Kubeadm Bootstrap Provider generates kubeadm configuration using the API version recommended for the target Kubernetes version.
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| Kubernetes v1.18 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.19 + etcd/v3 | ✓ (only workload) | ✓ (only workload) | | |
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| Kubernetes v1.20 + etcd/v3 | ✓ | ✓ | | |
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| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.21 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | |
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| Kubernetes v1.22 + etcd/v3 | ✓ | ✓ | ✓ (only workload) | ✓ (only workload) |
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| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.23 + etcd/v3 | ✓ | ✓ | ✓ | ✓ (only workload) |
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| Kubernetes v1.24 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.25 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.26 + etcd/v3 | ✓ | ✓ | ✓ | ✓ |
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| Kubernetes v1.27 + etcd/v3 | | | ✓ | ✓ |
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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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#### Kubernetes version specific notes
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**1.27**:
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* No specific notes
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**1.26**:
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* No specific notes
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