feat: add HostnamePolicy field to CollaSetSpec

apps/v1alpha1/collaset_types.go

@@ -56,6 +56,20 @@ const (
 	DeletePersistentVolumeClaimRetentionPolicyType PersistentVolumeClaimRetentionPolicyType = "Delete"
 )
 
+// HostnamePolicyType indicates how the pod's hostname is determined.
+// +kubebuilder:validation:Enum=PodName
+type HostnamePolicyType string
+
+const (
+	// HostnamePolicyPodName sets the pod's hostname to the pod name.
+	// This requires namingStrategy.podNamingSuffixPolicy to be PersistentSequence,
+	// as the pod name must be deterministic before creation.
+	// The resulting pod name must also be a valid Kubernetes hostname label:
+	// a single RFC 1123 DNS label containing no dots and no more than 63 characters.
+	// Otherwise the Pod will be rejected by the API server when the hostname is set.
+	HostnamePolicyPodName HostnamePolicyType = "PodName"
+)
+
 // PodUpdateStrategyType is a string enumeration type that enumerates
 // all possible ways we can update a Pod when updating application
 type PodUpdateStrategyType string
@@ -123,6 +137,13 @@ type CollaSetSpec struct {
 	// +optional
 	NamingStrategy *NamingStrategy `json:"namingStrategy,omitempty"`
 
+	// HostnamePolicy indicates how the pod's hostname is determined.
+	// When unset (nil), no hostname policy is applied.
+	// When set to "PodName", the pod's spec.hostname will be set to the pod name.
+	// This requires NamingStrategy.PodNamingSuffixPolicy to be PersistentSequence.
+	// +optional
+	HostnamePolicy *HostnamePolicyType `json:"hostnamePolicy,omitempty"`
+
 	// Indicate the number of histories to be conserved
 	// If unspecified, defaults to 20
 	// +optional

config/crd/apps/apps.kusionstack.io_collasets.yaml

@@ -83,6 +83,15 @@ spec:
                   If unspecified, defaults to 20
                 format: int32
                 type: integer
+              hostnamePolicy:
+                description: |-
+                  HostnamePolicy indicates how the pod's hostname is determined.
+                  When unset (nil), no hostname policy is applied.
+                  When set to "PodName", the pod's spec.hostname will be set to the pod name.
+                  This requires NamingStrategy.PodNamingSuffixPolicy to be PersistentSequence.
+                enum:
+                - PodName
+                type: string
               namingStrategy:
                 description: NamigPolicy indicates the strategy detail that will be
                   used for replica naming