support to configure MachineHealthChecks for managed Clusters

Author: Yuvaraj Kakaraparthi

api/v1alpha4/conversion.go

@@ -43,6 +43,10 @@ func (src *Cluster) ConvertTo(dstRaw conversion.Hub) error {
 		}
 		dst.Spec.Topology.Variables = restored.Spec.Topology.Variables
 
+		if restored.Spec.Topology.ControlPlane.MachineHealthCheck != nil {
+			dst.Spec.Topology.ControlPlane.MachineHealthCheck = restored.Spec.Topology.ControlPlane.MachineHealthCheck
+		}
+
 		if restored.Spec.Topology.ControlPlane.NodeDrainTimeout != nil {
 			dst.Spec.Topology.ControlPlane.NodeDrainTimeout = restored.Spec.Topology.ControlPlane.NodeDrainTimeout
 		}
@@ -60,6 +64,7 @@ func (src *Cluster) ConvertTo(dstRaw conversion.Hub) error {
 				dst.Spec.Topology.Workers.MachineDeployments[i].Variables = restored.Spec.Topology.Workers.MachineDeployments[i].Variables
 				dst.Spec.Topology.Workers.MachineDeployments[i].NodeDrainTimeout = restored.Spec.Topology.Workers.MachineDeployments[i].NodeDrainTimeout
 				dst.Spec.Topology.Workers.MachineDeployments[i].NodeDeletionTimeout = restored.Spec.Topology.Workers.MachineDeployments[i].NodeDeletionTimeout
+				dst.Spec.Topology.Workers.MachineDeployments[i].MachineHealthCheck = restored.Spec.Topology.Workers.MachineDeployments[i].MachineHealthCheck
 			}
 		}
 	}

api/v1alpha4/zz_generated.conversion.go

@@ -116,6 +116,11 @@ type ControlPlaneTopology struct {
 	// +optional
 	Replicas *int32 `json:"replicas,omitempty"`
 
+	// MachineHealthCheck allows to enable, disable and override
+	// the MachineHealthCheck configuration in the ClusterClass for this control plane.
+	// +optional
+	MachineHealthCheck *MachineHealthCheckTopology `json:"machineHealthCheck,omitempty"`
+
 	// NodeDrainTimeout is the total amount of time that the controller will spend on draining a node.
 	// The default value is 0, meaning that the node can be drained without any time limitations.
 	// NOTE: NodeDrainTimeout is different from `kubectl drain --timeout`
@@ -167,6 +172,11 @@ type MachineDeploymentTopology struct {
 	// +optional
 	Replicas *int32 `json:"replicas,omitempty"`
 
+	// MachineHealthCheck allows to enable, disable and override
+	// the MachineHealthCheck configuration in the ClusterClass for this MachineDeployment.
+	// +optional
+	MachineHealthCheck *MachineHealthCheckTopology `json:"machineHealthCheck,omitempty"`
+
 	// NodeDrainTimeout is the total amount of time that the controller will spend on draining a node.
 	// The default value is 0, meaning that the node can be drained without any time limitations.
 	// NOTE: NodeDrainTimeout is different from `kubectl drain --timeout`
@@ -184,6 +194,25 @@ type MachineDeploymentTopology struct {
 	Variables *MachineDeploymentVariables `json:"variables,omitempty"`
 }
 
+// MachineHealthCheckTopology defines a MachineHealthCheck for a group of machines.
+type MachineHealthCheckTopology struct {
+	// Enable controls if a MachineHealthCheck should be created for the target machines.
+	//
+	// If false: No MachineHealthCheck will be created.
+	//
+	// If not set(default): A MachineHealthCheck will be created if it is defined here or
+	//  in the associated ClusterClass. If no MachineHealthCheck is defined then none will be created.
+	//
+	// If true: A MachineHealthCheck is guaranteed to be created. Cluster validation will
+	// block if `enable` is true and no MachineHealthCheck definition is available.
+	// +optional
+	Enable *bool `json:"enable,omitempty"`
+
+	// MachineHealthCheckClass defines a MachineHealthCheck for a group of machines.
+	// If specified (any field is set), it entirely overrides the MachineHealthCheckClass defined in ClusterClass.
+	MachineHealthCheckClass `json:",inline"`
+}
+
 // ClusterVariable can be used to customize the Cluster through
 // patches. It must comply to the corresponding
 // ClusterClassVariable defined in the ClusterClass.

api/v1beta1/cluster_types.go

@@ -17,6 +17,8 @@ limitations under the License.
 package v1beta1
 
 import (
+	"reflect"
+
 	corev1 "k8s.io/api/core/v1"
 	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -177,6 +179,11 @@ type MachineHealthCheckClass struct {
 	RemediationTemplate *corev1.ObjectReference `json:"remediationTemplate,omitempty"`
 }
 
+// IsZero returns true if none of the values of MachineHealthCheckClass are defined.
+func (m MachineHealthCheckClass) IsZero() bool {
+	return reflect.ValueOf(m).IsZero()
+}
+
 // ClusterClassVariable defines a variable which can
 // be configured in the Cluster topology and used in patches.
 type ClusterClassVariable struct {