✨ Add ability to control "EKS Auto Mode" for EKS clusters

Signed-off-by: Siarhei Rasiukevich <s.rasiukevich@gmail.com>

Author: CharlieR-o-o-t

config/crd/bases/controlplane.cluster.x-k8s.io_awsmanagedcontrolplanes.yaml

@@ -2245,6 +2245,25 @@ spec:
             description: AWSManagedControlPlaneSpec defines the desired state of an
               Amazon EKS Cluster.
             properties:
+              accessConfig:
+                description: |-
+                  AccessConfig specifies the EKS cluster access configuration.
+                  It defines the authentication mode and whether to bootstrap the cluster creator
+                  as a cluster-admin.
+                properties:
+                  authenticationMode:
+                    description: |-
+                      AuthenticationMode mode controls how Kubernetes API authentication is performed:
+                        - CONFIG_MAP — uses only the aws-auth ConfigMap (legacy mode).
+                        - API — uses only EKS Access Entries (aws-auth is ignored).
+                        - API_AND_CONFIG_MAP — enables both Access Entries and aws-auth.
+                    type: string
+                  bootstrapAdminPermissions:
+                    description: |-
+                      BootstrapAdminPermissions specifies whether or not the cluster creator IAM principal was set as a cluster
+                      admin access entry during cluster creation time.
+                    type: boolean
+                type: object
               additionalTags:
                 additionalProperties:
                   type: string
@@ -2298,6 +2317,27 @@ spec:
                   AssociateOIDCProvider can be enabled to automatically create an identity
                   provider for the controller for use with IAM roles for service accounts
                 type: boolean
+              autoMode:
+                description: AutoMode is the EKS Auto Mode.
+                properties:
+                  compute:
+                    description: Compute capability configuration for EKS Auto Mode.
+                    properties:
+                      nodePools:
+                        items:
+                          type: string
+                        type: array
+                      nodeRoleArn:
+                        description: |-
+                          NodeRoleArn the ARN of the IAM Role EKS will assign to EC2 Managed Instances in your EKS
+                          Auto Mode cluster. This value cannot be changed after the compute capability of
+                          EKS Auto Mode is enabled. For more information, see the IAM Reference in the
+                          Amazon EKS User Guide.
+                        type: string
+                    type: object
+                  enabled:
+                    type: boolean
+                type: object
               bastion:
                 description: Bastion contains options to configure the bastion host.
                 properties:

config/crd/bases/controlplane.cluster.x-k8s.io_awsmanagedcontrolplanetemplates.yaml

@@ -53,6 +53,25 @@ spec:
                     description: AWSManagedControlPlaneSpec defines the desired state
                       of an Amazon EKS Cluster.
                     properties:
+                      accessConfig:
+                        description: |-
+                          AccessConfig specifies the EKS cluster access configuration.
+                          It defines the authentication mode and whether to bootstrap the cluster creator
+                          as a cluster-admin.
+                        properties:
+                          authenticationMode:
+                            description: |-
+                              AuthenticationMode mode controls how Kubernetes API authentication is performed:
+                                - CONFIG_MAP — uses only the aws-auth ConfigMap (legacy mode).
+                                - API — uses only EKS Access Entries (aws-auth is ignored).
+                                - API_AND_CONFIG_MAP — enables both Access Entries and aws-auth.
+                            type: string
+                          bootstrapAdminPermissions:
+                            description: |-
+                              BootstrapAdminPermissions specifies whether or not the cluster creator IAM principal was set as a cluster
+                              admin access entry during cluster creation time.
+                            type: boolean
+                        type: object
                       additionalTags:
                         additionalProperties:
                           type: string
@@ -107,6 +126,28 @@ spec:
                           AssociateOIDCProvider can be enabled to automatically create an identity
                           provider for the controller for use with IAM roles for service accounts
                         type: boolean
+                      autoMode:
+                        description: AutoMode is the EKS Auto Mode.
+                        properties:
+                          compute:
+                            description: Compute capability configuration for EKS
+                              Auto Mode.
+                            properties:
+                              nodePools:
+                                items:
+                                  type: string
+                                type: array
+                              nodeRoleArn:
+                                description: |-
+                                  NodeRoleArn the ARN of the IAM Role EKS will assign to EC2 Managed Instances in your EKS
+                                  Auto Mode cluster. This value cannot be changed after the compute capability of
+                                  EKS Auto Mode is enabled. For more information, see the IAM Reference in the
+                                  Amazon EKS User Guide.
+                                type: string
+                            type: object
+                          enabled:
+                            type: boolean
+                        type: object
                       bastion:
                         description: Bastion contains options to configure the bastion
                           host.

controlplane/eks/api/v1beta1/conversion.go

@@ -121,6 +121,8 @@ func (r *AWSManagedControlPlane) ConvertTo(dstRaw conversion.Hub) error {
 	dst.Spec.RolePermissionsBoundary = restored.Spec.RolePermissionsBoundary
 	dst.Status.Version = restored.Status.Version
 	dst.Spec.BootstrapSelfManagedAddons = restored.Spec.BootstrapSelfManagedAddons
+	dst.Spec.AccessConfig = restored.Spec.AccessConfig
+	dst.Spec.AutoMode = restored.Spec.AutoMode
 	return nil
 }
 

controlplane/eks/api/v1beta1/zz_generated.conversion.go

@@ -131,6 +131,12 @@ type AWSManagedControlPlaneSpec struct { //nolint: maligned
 	// +optional
 	IAMAuthenticatorConfig *IAMAuthenticatorConfig `json:"iamAuthenticatorConfig,omitempty"`
 
+	// AccessConfig specifies the EKS cluster access configuration.
+	// It defines the authentication mode and whether to bootstrap the cluster creator
+	// as a cluster-admin.
+	// +optional
+	AccessConfig AccessConfig `json:"accessConfig,omitempty"`
+
 	// Endpoints specifies access to this cluster's control plane endpoints
 	// +optional
 	EndpointAccess EndpointAccess `json:"endpointAccess,omitempty"`
@@ -200,7 +206,10 @@ type AWSManagedControlPlaneSpec struct { //nolint: maligned
 	// bare EKS cluster without EKS default networking addons
 	// If you set this value to false when creating a cluster, the default networking add-ons will not be installed
 	// +kubebuilder:default=true
-	BootstrapSelfManagedAddons bool `json:"bootstrapSelfManagedAddons,omitempty"`
+	BootstrapSelfManagedAddons *bool `json:"bootstrapSelfManagedAddons,omitempty"`
+
+	// +optional
+	AutoMode *AutoMode `json:"autoMode,omitempty"`
 
 	// RestrictPrivateSubnets indicates that the EKS control plane should only use private subnets.
 	// +kubebuilder:default=false
@@ -221,6 +230,39 @@ type KubeProxy struct {
 	Disable bool `json:"disable,omitempty"`
 }
 
+// AccessConfig is the access configuration for the cluster.
+type AccessConfig struct {
+	// AuthenticationMode mode controls how Kubernetes API authentication is performed:
+	//   - CONFIG_MAP — uses only the aws-auth ConfigMap (legacy mode).
+	//   - API — uses only EKS Access Entries (aws-auth is ignored).
+	//   - API_AND_CONFIG_MAP — enables both Access Entries and aws-auth.
+	AuthenticationMode *string `json:"authenticationMode,omitempty"`
+
+	// BootstrapAdminPermissions specifies whether or not the cluster creator IAM principal was set as a cluster
+	// admin access entry during cluster creation time.
+	BootstrapAdminPermissions *bool `json:"bootstrapAdminPermissions,omitempty"`
+}
+
+// AutoMode is the EKS Auto Mode.
+// allows to ootstrap cluster with aws compute, ebs, elb capability.
+type AutoMode struct {
+	Enabled bool `json:"enabled,omitempty"`
+	// Compute capability configuration for EKS Auto Mode.
+	// +optional
+	Compute Compute `json:"compute,omitempty"`
+}
+
+// Compute allows to run compute capability with EKS AutoMode.
+type Compute struct {
+	NodePools []string `json:"nodePools,omitempty"`
+	// NodeRoleArn the ARN of the IAM Role EKS will assign to EC2 Managed Instances in your EKS
+	// Auto Mode cluster. This value cannot be changed after the compute capability of
+	// EKS Auto Mode is enabled. For more information, see the IAM Reference in the
+	// Amazon EKS User Guide.
+	// +optional
+	NodeRoleArn *string `json:"nodeRoleArn,omitempty"`
+}
+
 // VpcCni specifies configuration related to the VPC CNI.
 type VpcCni struct {
 	// Disable indicates that the Amazon VPC CNI should be disabled. With EKS clusters the

controlplane/eks/api/v1beta2/awsmanagedcontrolplane_types.go

@@ -22,9 +22,12 @@ import (
 	"net"
 
 	"github.com/apparentlymart/go-cidr/cidr"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	ekstypes "github.com/aws/aws-sdk-go-v2/service/eks/types"
 	"github.com/pkg/errors"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/klog/v2"
@@ -52,6 +55,9 @@ const (
 	cidrSizeMin    = 16
 	vpcCniAddon    = "vpc-cni"
 	kubeProxyAddon = "kube-proxy"
+
+	autoModeComputeNodePoolSystem  = "system"
+	autoModeComputeNodePoolGeneral = "general-purpose"
 )
 
 // SetupWebhookWithManager will setup the webhooks for the AWSManagedControlPlane.
@@ -102,6 +108,8 @@ func (*awsManagedControlPlaneWebhook) ValidateCreate(_ context.Context, obj runt
 	allErrs = append(allErrs, r.validateSecondaryCIDR()...)
 	allErrs = append(allErrs, r.validateEKSAddons()...)
 	allErrs = append(allErrs, r.validateDisableVPCCNI()...)
+	allErrs = append(allErrs, r.validateAccessConfig(nil)...)
+	allErrs = append(allErrs, r.validateAutoMode(nil)...)
 	allErrs = append(allErrs, r.validateRestrictPrivateSubnets()...)
 	allErrs = append(allErrs, r.validateKubeProxy()...)
 	allErrs = append(allErrs, r.Spec.AdditionalTags.Validate()...)
@@ -142,6 +150,8 @@ func (*awsManagedControlPlaneWebhook) ValidateUpdate(ctx context.Context, oldObj
 	allErrs = append(allErrs, r.Spec.Bastion.Validate()...)
 	allErrs = append(allErrs, r.validateIAMAuthConfig()...)
 	allErrs = append(allErrs, r.validateSecondaryCIDR()...)
+	allErrs = append(allErrs, r.validateAccessConfig(oldAWSManagedControlplane)...)
+	allErrs = append(allErrs, r.validateAutoMode(oldAWSManagedControlplane)...)
 	allErrs = append(allErrs, r.validateEKSAddons()...)
 	allErrs = append(allErrs, r.validateDisableVPCCNI()...)
 	allErrs = append(allErrs, r.validateRestrictPrivateSubnets()...)
@@ -423,6 +433,90 @@ func validateDisableVPCCNI(vpcCni VpcCni, addons *[]Addon, path *field.Path) fie
 	return allErrs
 }
 
+func (r *AWSManagedControlPlane) validateAccessConfig(old *AWSManagedControlPlane) field.ErrorList {
+	return validateAccessConfig(r.Spec.AccessConfig, old, field.NewPath("spec", "accessConfig"))
+}
+
+func validateAccessConfig(accessConfig AccessConfig, old *AWSManagedControlPlane, path *field.Path) field.ErrorList {
+	var (
+		allErrs    field.ErrorList
+		authModeOK bool
+	)
+
+	authConfigField := path.Child("authenticationMode")
+
+	for _, accessMode := range ekstypes.AuthenticationMode("").Values() {
+		if ekstypes.AuthenticationMode(*accessConfig.AuthenticationMode) == accessMode {
+			authModeOK = true
+		}
+	}
+
+	if !authModeOK {
+		allErrs = append(allErrs, field.Invalid(authConfigField, *accessConfig.AuthenticationMode, "unsupported authenticationMode provided"))
+	}
+
+	if old != nil {
+		if *old.Spec.AccessConfig.AuthenticationMode != *accessConfig.AuthenticationMode {
+			if ekstypes.AuthenticationMode(*accessConfig.AuthenticationMode) == ekstypes.AuthenticationModeConfigMap {
+				allErrs = append(allErrs, field.Invalid(authConfigField, *accessConfig.AuthenticationMode, "cannot switch authenticationMode to legacy CONFIG_MAP mode"))
+			}
+		}
+	}
+
+	if *accessConfig.BootstrapAdminPermissions && ekstypes.AuthenticationMode(*accessConfig.AuthenticationMode) == ekstypes.AuthenticationModeConfigMap {
+		authConfigField := path.Child("bootstrapAdminPermissions")
+		allErrs = append(allErrs, field.Invalid(authConfigField, *accessConfig.BootstrapAdminPermissions, "authenticationMode CONFIG_MAP has no effect with the bootstrapAdminPermissions parameter"))
+	}
+
+	return allErrs
+}
+
+func (r *AWSManagedControlPlane) validateAutoMode(old *AWSManagedControlPlane) field.ErrorList {
+	return validateAutoMode(r.Spec, old, field.NewPath("spec"))
+}
+
+func validateAutoMode(spec AWSManagedControlPlaneSpec, old *AWSManagedControlPlane, path *field.Path) field.ErrorList {
+	var allErrs field.ErrorList
+
+	if spec.AutoMode == nil {
+		return nil
+	}
+
+	if spec.AutoMode.Enabled {
+		// EKS Auto mode is not compatible with configmap AuthenticationMode.
+		if *spec.AccessConfig.AuthenticationMode == string(ekstypes.AuthenticationModeConfigMap) {
+			authConfigField := path.Child("accessConfig", "authenticationMode")
+			allErrs = append(allErrs, field.Invalid(authConfigField, spec.AccessConfig.AuthenticationMode, "authenticationMode CONFIG_MAP couldn't be used with autoMode"))
+		}
+
+		if old != nil {
+			// nodeRoleArn cannot be changed after the compute capability of EKS Auto Mode is enabled.
+			if old.Spec.AutoMode.Compute.NodeRoleArn != spec.AutoMode.Compute.NodeRoleArn {
+				nodeRoleArnField := path.Child("autoMode", "compute", "nodeRoleArn")
+				allErrs = append(allErrs, field.Invalid(nodeRoleArnField, spec.AutoMode.Compute.NodeRoleArn, "nodeRoleArn could not be changed"))
+			}
+		}
+
+		if len(spec.AutoMode.Compute.NodePools) > 0 {
+			// nodeRoleArn should be always defined with node pools.
+			if spec.AutoMode.Compute.NodeRoleArn == nil {
+				nodeRoleArnField := path.Child("autoMode", "compute", "nodeRoleArn")
+				allErrs = append(allErrs, field.Invalid(nodeRoleArnField, spec.AutoMode.Compute.NodeRoleArn, "nodeRoleArn is required when nodePools specified"))
+			}
+
+			allowedPoolNames := sets.New[string](autoModeComputeNodePoolSystem, autoModeComputeNodePoolGeneral)
+			for _, poolName := range spec.AutoMode.Compute.NodePools {
+				nodePoolsField := path.Child("autoMode", "compute", "nodePools")
+				if !allowedPoolNames.Has(poolName) {
+					allErrs = append(allErrs, field.Invalid(nodePoolsField, poolName, "nodePools contains an invalid pool"))
+				}
+			}
+		}
+	}
+
+	return allErrs
+}
+
 func (r *AWSManagedControlPlane) validateRestrictPrivateSubnets() field.ErrorList {
 	return validateRestrictPrivateSubnets(r.Spec.RestrictPrivateSubnets, r.Spec.NetworkSpec, r.Spec.EKSClusterName, field.NewPath("spec"))
 }
@@ -568,10 +662,16 @@ func (*awsManagedControlPlaneWebhook) Default(_ context.Context, obj runtime.Obj
 		}
 	}
 
+	if r.Spec.BootstrapSelfManagedAddons == nil {
+		r.Spec.BootstrapSelfManagedAddons = aws.Bool(true)
+	}
+
+	if r.Spec.AccessConfig.AuthenticationMode == nil {
+		r.Spec.AccessConfig.AuthenticationMode = aws.String(string(ekstypes.AuthenticationModeConfigMap))
+	}
+
 	infrav1.SetDefaults_Bastion(&r.Spec.Bastion)
 	infrav1.SetDefaults_NetworkSpec(&r.Spec.NetworkSpec)
 
-	// Set default value for BootstrapSelfManagedAddons
-	r.Spec.BootstrapSelfManagedAddons = true
 	return nil
 }