feat: add support for cluster class

Signed-off-by: Carlos Salas <[email protected]>

README.md

@@ -122,7 +122,7 @@ Set the following environment variables:
 - CABPR_WK_REPLICAS
 - KUBERNETES_VERSION
 
-for example :
+for example:
 
 ```bash
 export CABPR_NAMESPACE=example
@@ -197,6 +197,62 @@ To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
 
 :tada: CONGRATULATIONS ! :tada: You created your first RKE2 cluster with CAPD as an infrastructure provider.
 
+### Using ClusterClass for cluster creation
+
+This provider supports using [ClusterClass](https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210526-cluster-class-and-managed-topologies.md), a Cluster API feature that implements an extra level of abstraction on top of the existing Cluster API functionality. The `ClusterClass` object is used to define a collection of template resources (control plane and machine deployment) which are used to generate one or more clusters of the same flavor.
+
+If you are interested in leveraging this functionality, you can refer to the examples [here](./samples/docker/clusterclass/):
+- [clusterclass-quick-start.yaml](./samples/docker/clusterclass/clusterclass-quick-start.yaml): creates a sample `ClusterClass` and necessary resources.
+- [rke2-sample.yaml](./samples/docker/clusterclass/rke2-sample.yaml): creates a workload cluster using the `ClusterClass`.
+
+As with other sample templates, you will need to set a number environment variables:
+- CLUSTER_NAME
+- CABPR_CP_REPLICAS
+- CABPR_WK_REPLICAS
+- KUBERNETES_VERSION
+- KIND_IP
+
+for example :
+
+```bash
+export CLUSTER_NAME=capd-rke2-clusterclass
+export CABPR_CP_REPLICAS=3
+export CABPR_WK_REPLICAS=2
+export KUBERNETES_VERSION=v1.25.11
+export KIND_IP=192.168.20.20
+```
+
+**Remember that, since we are using Kind, the value of `KIND_IP` must be an IP address in the range of the `kind` network.**
+You can check the range Docker assigns to this network by inspecting it:
+
+```bash
+docker network inspect kind
+```
+
+The next step is to substitue the values in the YAML using the following commands:
+
+```bash
+cat clusterclass-quick-start.yaml | clusterctl generate yaml > clusterclass-example.yaml
+```
+
+At this moment, you can take some time to study the resulting YAML, then you can apply it to the management cluster:
+
+```bash
+kubectl apply -f clusterclass-example.yaml
+```
+
+This will create a new `ClusterClass` template that can be used to provision one or multiple workload clusters of the same flavor.
+To do so, you can follow the same procedure and substitute the values in the YAML for the cluster definition:
+
+```bash
+cat rke2-sample.yaml | clusterctl generate yaml > rke2-clusterclass-example.yaml
+```
+
+And then apply the resulting YAML file to create a cluster from the existing `ClusterClass`.
+```bash
+kubectl apply -f rke2-clusterclass-example.yaml
+```
+
 ## Testing the DEV main branch
 These instructions are for development purposes initially and will be changed in the future for user facing instructions.
 

bootstrap/api/v1beta1/rke2config_types.go

@@ -147,6 +147,7 @@ type RKE2AgentConfig struct {
 	LoadBalancerPort int `json:"loadBalancerPort,omitempty"`
 
 	// Version specifies the rke2 version.
+	// This field will be deprecated in newer versions of the API and RKE2ControlPlaneSpec.Version will be used instead.
 	//+optional
 	Version string `json:"version,omitempty"`
 

bootstrap/config/crd/bases/bootstrap.cluster.x-k8s.io_rke2configs.yaml

@@ -850,7 +850,9 @@ spec:
                       for all system images.
                     type: string
                   version:
-                    description: Version specifies the rke2 version.
+                    description: Version specifies the rke2 version. This field will
+                      be deprecated in newer versions of the API and RKE2ControlPlaneSpec.Version
+                      will be used instead.
                     type: string
                 type: object
               files:

bootstrap/config/crd/bases/bootstrap.cluster.x-k8s.io_rke2configtemplates.yaml

@@ -869,7 +869,9 @@ spec:
                               be used for all system images.
                             type: string
                           version:
-                            description: Version specifies the rke2 version.
+                            description: Version specifies the rke2 version. This
+                              field will be deprecated in newer versions of the API
+                              and RKE2ControlPlaneSpec.Version will be used instead.
                             type: string
                         type: object
                       files:

bootstrap/config/crd/kustomization.yaml

@@ -1,5 +1,5 @@
 commonLabels:
-  cluster.x-k8s.io/v1beta1: v1alpha1
+  cluster.x-k8s.io/v1beta1: v1alpha1_v1beta1
 
 # This kustomization.yaml is not intended to be run by itself,
 # since it depends on service name and namespace that are out of this kustomize package.

bootstrap/config/crd/patches/webhook_in_rke2configs.yaml

@@ -17,3 +17,4 @@ spec:
           path: /convert
       conversionReviewVersions:
       - v1
+      - v1beta1

controlplane/api/v1alpha1/conversion.go

@@ -19,6 +19,9 @@ package v1alpha1
 import (
 	"fmt"
 
+	apiconversion "k8s.io/apimachinery/pkg/conversion"
+	utilconversion "sigs.k8s.io/cluster-api/util/conversion"
+
 	controlplanev1 "github.com/rancher-sandbox/cluster-api-provider-rke2/controlplane/api/v1beta1"
 	"sigs.k8s.io/controller-runtime/pkg/conversion"
 )
@@ -28,11 +31,20 @@ func (src *RKE2ControlPlane) ConvertTo(dstRaw conversion.Hub) error {
 	if !ok {
 		return fmt.Errorf("not a RKE2ControlPlane: %v", dst)
 	}
-
 	if err := Convert_v1alpha1_RKE2ControlPlane_To_v1beta1_RKE2ControlPlane(src, dst, nil); err != nil {
 		return err
 	}
 
+	// Manually restore data.
+	restored := &controlplanev1.RKE2ControlPlane{}
+	if ok, err := utilconversion.UnmarshalData(src, restored); err != nil || !ok {
+		return err
+	}
+
+	dst.Spec.MachineTemplate = restored.Spec.MachineTemplate
+	dst.Spec.Version = restored.Spec.Version
+	dst.Status = restored.Status
+
 	return nil
 }
 
@@ -46,6 +58,11 @@ func (dst *RKE2ControlPlane) ConvertFrom(srcRaw conversion.Hub) error {
 		return err
 	}
 
+	// Preserve Hub data on down-conversion
+	if err := utilconversion.MarshalData(src, dst); err != nil {
+		return err
+	}
+
 	return nil
 }
 
@@ -85,6 +102,15 @@ func (src *RKE2ControlPlaneTemplate) ConvertTo(dstRaw conversion.Hub) error {
 		return err
 	}
 
+	// Manually restore data.
+	restored := &controlplanev1.RKE2ControlPlaneTemplate{}
+	if ok, err := utilconversion.UnmarshalData(src, restored); err != nil || !ok {
+		return err
+	}
+
+	dst.Spec.Template = restored.Spec.Template
+	dst.Status = restored.Status
+
 	return nil
 }
 
@@ -98,6 +124,11 @@ func (dst *RKE2ControlPlaneTemplate) ConvertFrom(srcRaw conversion.Hub) error {
 		return err
 	}
 
+	// Preserve Hub data on down-conversion
+	if err := utilconversion.MarshalData(src, dst); err != nil {
+		return err
+	}
+
 	return nil
 }
 
@@ -126,3 +157,33 @@ func (dst *RKE2ControlPlaneTemplateList) ConvertFrom(srcRaw conversion.Hub) erro
 
 	return nil
 }
+
+func Convert_v1beta1_RKE2ControlPlaneSpec_To_v1alpha1_RKE2ControlPlaneSpec(in *controlplanev1.RKE2ControlPlaneSpec, out *RKE2ControlPlaneSpec, s apiconversion.Scope) error {
+	// Version was added in v1beta1.
+	// MachineTemplate was added in v1beta1.
+	return autoConvert_v1beta1_RKE2ControlPlaneSpec_To_v1alpha1_RKE2ControlPlaneSpec(in, out, s)
+}
+
+func Convert_v1beta1_RKE2ControlPlaneStatus_To_v1alpha1_RKE2ControlPlaneStatus(in *controlplanev1.RKE2ControlPlaneStatus, out *RKE2ControlPlaneStatus, s apiconversion.Scope) error {
+	return autoConvert_v1beta1_RKE2ControlPlaneStatus_To_v1alpha1_RKE2ControlPlaneStatus(in, out, s)
+}
+
+func Convert_v1alpha1_RKE2ControlPlaneStatus_To_v1beta1_RKE2ControlPlaneStatus(in *RKE2ControlPlaneStatus, out *controlplanev1.RKE2ControlPlaneStatus, s apiconversion.Scope) error {
+	return autoConvert_v1alpha1_RKE2ControlPlaneStatus_To_v1beta1_RKE2ControlPlaneStatus(in, out, s)
+}
+
+func Convert_v1beta1_RKE2ControlPlaneTemplateSpec_To_v1alpha1_RKE2ControlPlaneTemplateSpec(in *controlplanev1.RKE2ControlPlaneTemplateSpec, out *RKE2ControlPlaneTemplateSpec, s apiconversion.Scope) error {
+	return autoConvert_v1beta1_RKE2ControlPlaneTemplateSpec_To_v1alpha1_RKE2ControlPlaneTemplateSpec(in, out, s)
+}
+
+func Convert_v1alpha1_RKE2ControlPlaneTemplateSpec_To_v1beta1_RKE2ControlPlaneTemplateSpec(in *RKE2ControlPlaneTemplateSpec, out *controlplanev1.RKE2ControlPlaneTemplateSpec, s apiconversion.Scope) error {
+	return autoConvert_v1alpha1_RKE2ControlPlaneTemplateSpec_To_v1beta1_RKE2ControlPlaneTemplateSpec(in, out, s)
+}
+
+func Convert_v1alpha1_RKE2ControlPlaneTemplateStatus_To_v1beta1_RKE2ControlPlaneStatus(in *RKE2ControlPlaneTemplateStatus, out *controlplanev1.RKE2ControlPlaneStatus, s apiconversion.Scope) error {
+	return nil
+}
+
+func Convert_v1beta1_RKE2ControlPlaneStatus_To_v1alpha1_RKE2ControlPlaneTemplateStatus(in *controlplanev1.RKE2ControlPlaneStatus, out *RKE2ControlPlaneTemplateStatus, s apiconversion.Scope) error {
+	return nil
+}

controlplane/api/v1alpha1/rke2controlplanetemplate_types.go

@@ -27,9 +27,6 @@ import (
 type RKE2ControlPlaneTemplateSpec struct {
 	// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
 	// Important: Run "make" to regenerate code after modifying this file
-
-	// Foo is an example field of RKE2ControlPlaneTemplate. Edit rke2controlplanetemplate_types.go to remove/update
-	Foo string `json:"foo,omitempty"`
 }
 
 // RKE2ControlPlaneTemplateStatus defines the observed state of RKE2ControlPlaneTemplate.