Remove PodHostIPs feature gates.

Signed-off-by: Lan Liang <gcslyp@gmail.com>

pkg/api/pod/util.go

@@ -377,8 +377,6 @@ func GetValidationOptionsFromPodSpecAndMeta(podSpec, oldPodSpec *api.PodSpec, po
 	// default pod validation options based on feature gate
 	opts := apivalidation.PodValidationOptions{
 		AllowInvalidPodDeletionCost: !utilfeature.DefaultFeatureGate.Enabled(features.PodDeletionCost),
-		// Allow pod spec to use status.hostIPs in downward API if feature is enabled
-		AllowHostIPsField: utilfeature.DefaultFeatureGate.Enabled(features.PodHostIPs),
 		// Do not allow pod spec to use non-integer multiple of huge page unit size default
 		AllowIndivisibleHugePagesValues:                   false,
 		AllowInvalidLabelValueInSelector:                  false,
@@ -396,9 +394,6 @@ func GetValidationOptionsFromPodSpecAndMeta(podSpec, oldPodSpec *api.PodSpec, po
 	opts.AllowOnlyRecursiveSELinuxChangePolicy = useOnlyRecursiveSELinuxChangePolicy(oldPodSpec)
 
 	if oldPodSpec != nil {
-		// if old spec has status.hostIPs downwardAPI set, we must allow it
-		opts.AllowHostIPsField = opts.AllowHostIPsField || hasUsedDownwardAPIFieldPathWithPodSpec(oldPodSpec, "status.hostIPs")
-
 		// if old spec used non-integer multiple of huge page unit size, we must allow it
 		opts.AllowIndivisibleHugePagesValues = usesIndivisibleHugePagesValues(oldPodSpec)
 
@@ -536,55 +531,6 @@ func relaxedEnvVarUsed(name string, oldPodEnvVarNames sets.Set[string]) bool {
 	return false
 }
 
-func hasUsedDownwardAPIFieldPathWithPodSpec(podSpec *api.PodSpec, fieldPath string) bool {
-	if podSpec == nil {
-		return false
-	}
-	for _, vol := range podSpec.Volumes {
-		if hasUsedDownwardAPIFieldPathWithVolume(&vol, fieldPath) {
-			return true
-		}
-	}
-	for _, c := range podSpec.InitContainers {
-		if hasUsedDownwardAPIFieldPathWithContainer(&c, fieldPath) {
-			return true
-		}
-	}
-	for _, c := range podSpec.Containers {
-		if hasUsedDownwardAPIFieldPathWithContainer(&c, fieldPath) {
-			return true
-		}
-	}
-	return false
-}
-
-func hasUsedDownwardAPIFieldPathWithVolume(volume *api.Volume, fieldPath string) bool {
-	if volume == nil || volume.DownwardAPI == nil {
-		return false
-	}
-	for _, file := range volume.DownwardAPI.Items {
-		if file.FieldRef != nil &&
-			file.FieldRef.FieldPath == fieldPath {
-			return true
-		}
-	}
-	return false
-}
-
-func hasUsedDownwardAPIFieldPathWithContainer(container *api.Container, fieldPath string) bool {
-	if container == nil {
-		return false
-	}
-	for _, env := range container.Env {
-		if env.ValueFrom != nil &&
-			env.ValueFrom.FieldRef != nil &&
-			env.ValueFrom.FieldRef.FieldPath == fieldPath {
-			return true
-		}
-	}
-	return false
-}
-
 // GetValidationOptionsFromPodTemplate will return pod validation options for specified template.
 func GetValidationOptionsFromPodTemplate(podTemplate, oldPodTemplate *api.PodTemplateSpec) apivalidation.PodValidationOptions {
 	var newPodSpec, oldPodSpec *api.PodSpec
@@ -859,11 +805,6 @@ func dropDisabledPodStatusFields(podStatus, oldPodStatus *api.PodStatus, podSpec
 		podStatus.ResourceClaimStatuses = nil
 	}
 
-	// drop HostIPs to empty (disable PodHostIPs).
-	if !utilfeature.DefaultFeatureGate.Enabled(features.PodHostIPs) && !hostIPsInUse(oldPodStatus) {
-		podStatus.HostIPs = nil
-	}
-
 	if !utilfeature.DefaultFeatureGate.Enabled(features.RecursiveReadOnlyMounts) && !rroInUse(oldPodSpec) {
 		for i := range podStatus.ContainerStatuses {
 			podStatus.ContainerStatuses[i].VolumeMounts = nil
@@ -900,13 +841,6 @@ func dropDisabledPodStatusFields(podStatus, oldPodStatus *api.PodStatus, podSpec
 	}
 }
 
-func hostIPsInUse(podStatus *api.PodStatus) bool {
-	if podStatus == nil {
-		return false
-	}
-	return len(podStatus.HostIPs) > 0
-}
-
 // dropDisabledDynamicResourceAllocationFields removes pod claim references from
 // container specs and pod-level resource claims unless they are already used
 // by the old pod spec.

pkg/apis/core/validation/validation.go

@@ -1073,7 +1073,6 @@ func validateDownwardAPIVolumeFile(file *core.DownwardAPIVolumeFile, fldPath *fi
 		if file.ResourceFieldRef != nil {
 			allErrs = append(allErrs, field.Invalid(fldPath, "resource", "fieldRef and resourceFieldRef can not be specified simultaneously"))
 		}
-		allErrs = append(allErrs, validateDownwardAPIHostIPs(file.FieldRef, fldPath.Child("fieldRef"), opts)...)
 	} else if file.ResourceFieldRef != nil {
 		localValidContainerResourceFieldPathPrefixes := validContainerResourceFieldPathPrefixesWithDownwardAPIHugePages
 		allErrs = append(allErrs, validateContainerResourceFieldSelector(file.ResourceFieldRef, &validContainerResourceFieldPathExpressions, &localValidContainerResourceFieldPathPrefixes, fldPath.Child("resourceFieldRef"), true)...)
@@ -2655,7 +2654,6 @@ func validateEnvVarValueFrom(ev core.EnvVar, fldPath *field.Path, opts PodValida
 	if ev.ValueFrom.FieldRef != nil {
 		numSources++
 		allErrs = append(allErrs, validateObjectFieldSelector(ev.ValueFrom.FieldRef, &validEnvDownwardAPIFieldPathExpressions, fldPath.Child("fieldRef"))...)
-		allErrs = append(allErrs, validateDownwardAPIHostIPs(ev.ValueFrom.FieldRef, fldPath.Child("fieldRef"), opts)...)
 	}
 	if ev.ValueFrom.ResourceFieldRef != nil {
 		numSources++
@@ -2719,16 +2717,6 @@ func validateObjectFieldSelector(fs *core.ObjectFieldSelector, expressions *sets
 	return allErrs
 }
 
-func validateDownwardAPIHostIPs(fieldSel *core.ObjectFieldSelector, fldPath *field.Path, opts PodValidationOptions) field.ErrorList {
-	allErrs := field.ErrorList{}
-	if !opts.AllowHostIPsField {
-		if fieldSel.FieldPath == "status.hostIPs" {
-			allErrs = append(allErrs, field.Forbidden(fldPath, "may not be set when feature gate 'PodHostIPs' is not enabled"))
-		}
-	}
-	return allErrs
-}
-
 func validateContainerResourceFieldSelector(fs *core.ResourceFieldSelector, expressions *sets.Set[string], prefixes *sets.Set[string], fldPath *field.Path, volume bool) field.ErrorList {
 	allErrs := field.ErrorList{}
 
@@ -4041,8 +4029,6 @@ type PodValidationOptions struct {
 	AllowInvalidLabelValueInSelector bool
 	// Allow pod spec to use non-integer multiple of huge page unit size
 	AllowIndivisibleHugePagesValues bool
-	// Allow pod spec to use status.hostIPs in downward API if feature is enabled
-	AllowHostIPsField bool
 	// Allow invalid topologySpreadConstraint labelSelector for backward compatibility
 	AllowInvalidTopologySpreadConstraintLabelSelector bool
 	// Allow projected token volumes with non-local paths

pkg/apis/core/validation/validation_test.go

@@ -23736,41 +23736,6 @@ func TestValidateAppArmorProfileFormat(t *testing.T) {
 	}
 }
 
-func TestValidateDownwardAPIHostIPs(t *testing.T) {
-	testCases := []struct {
-		name           string
-		expectError    bool
-		featureEnabled bool
-		fieldSel       *core.ObjectFieldSelector
-	}{
-		{
-			name:           "has no hostIPs field, featuregate enabled",
-			expectError:    false,
-			featureEnabled: true,
-			fieldSel:       &core.ObjectFieldSelector{FieldPath: "status.hostIP"},
-		},
-		{
-			name:           "has hostIPs field, featuregate enabled",
-			expectError:    false,
-			featureEnabled: true,
-			fieldSel:       &core.ObjectFieldSelector{FieldPath: "status.hostIPs"},
-		},
-	}
-	for _, testCase := range testCases {
-		t.Run(testCase.name, func(t *testing.T) {
-			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodHostIPs, testCase.featureEnabled)
-
-			errs := validateDownwardAPIHostIPs(testCase.fieldSel, field.NewPath("fieldSel"), PodValidationOptions{AllowHostIPsField: testCase.featureEnabled})
-			if testCase.expectError && len(errs) == 0 {
-				t.Errorf("Unexpected success")
-			}
-			if !testCase.expectError && len(errs) != 0 {
-				t.Errorf("Unexpected error(s): %v", errs)
-			}
-		})
-	}
-}
-
 func TestValidatePVSecretReference(t *testing.T) {
 	rootFld := field.NewPath("name")
 	type args struct {

pkg/features/kube_features.go

@@ -472,12 +472,6 @@ const (
 	// sandbox creation and network configuration completes successfully
 	PodReadyToStartContainersCondition featuregate.Feature = "PodReadyToStartContainersCondition"
 
-	// owner: @wzshiming
-	// kep: http://kep.k8s.io/2681
-	//
-	// Adds pod.status.hostIPs and downward API
-	PodHostIPs featuregate.Feature = "PodHostIPs"
-
 	// owner: @AxeZhan
 	// kep: http://kep.k8s.io/3960
 	//

pkg/features/versioned_kube_features.go

@@ -558,12 +558,6 @@ var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate
 		{Version: version.MustParse("1.31"), Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.33
 	},
 
-	PodHostIPs: {
-		{Version: version.MustParse("1.28"), Default: false, PreRelease: featuregate.Alpha},
-		{Version: version.MustParse("1.29"), Default: true, PreRelease: featuregate.Beta},
-		{Version: version.MustParse("1.30"), Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.32
-	},
-
 	PodIndexLabel: {
 		{Version: version.MustParse("1.28"), Default: true, PreRelease: featuregate.Beta},
 		{Version: version.MustParse("1.32"), Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.35

pkg/kubelet/kubelet_pods.go

@@ -949,9 +949,6 @@ func (kl *Kubelet) podFieldSelectorRuntimeValue(fs *v1.ObjectFieldSelector, pod
 		}
 		return hostIPs[0].String(), nil
 	case "status.hostIPs":
-		if !utilfeature.DefaultFeatureGate.Enabled(features.PodHostIPs) {
-			return "", nil
-		}
 		hostIPs, err := kl.getHostIPsAnyWay()
 		if err != nil {
 			return "", err
@@ -1921,11 +1918,9 @@ func (kl *Kubelet) generateAPIPodStatus(pod *v1.Pod, podStatus *kubecontainer.Po
 				}
 			}
 			s.HostIP = hostIPs[0].String()
-			if utilfeature.DefaultFeatureGate.Enabled(features.PodHostIPs) {
+			s.HostIPs = []v1.HostIP{{IP: s.HostIP}}
-				s.HostIPs = []v1.HostIP{{IP: s.HostIP}}
+			if len(hostIPs) == 2 {
-				if len(hostIPs) == 2 {
+				s.HostIPs = append(s.HostIPs, v1.HostIP{IP: hostIPs[1].String()})
-					s.HostIPs = append(s.HostIPs, v1.HostIP{IP: hostIPs[1].String()})
-				}
 			}
 
 			// HostNetwork Pods inherit the node IPs as PodIPs. They are immutable once set,

test/conformance/testdata/conformance.yaml

@@ -2152,6 +2152,14 @@
     in the container.
   release: v1.9
   file: test/e2e/common/node/downwardapi.go
+- testname: DownwardAPI, environment for hostIPs
+  codename: '[sig-node] Downward API should provide hostIPs as an env var [NodeConformance]
+    [Conformance]'
+  description: Downward API MUST expose Pod and Container fields as environment variables.
+    Specify hostIPs as environment variable in the Pod Spec are visible at runtime
+    in the container.
+  release: v1.32
+  file: test/e2e/common/node/downwardapi.go
 - testname: DownwardAPI, environment for Pod UID
   codename: '[sig-node] Downward API should provide pod UID as env vars [NodeConformance]
     [Conformance]'

test/e2e/common/node/downwardapi.go

@@ -110,6 +110,32 @@ var _ = SIGDescribe("Downward API", func() {
 		testDownwardAPI(ctx, f, podName, env, expectations)
 	})
 
+	/*
+	   Release: v1.32
+	   Testname: DownwardAPI, environment for hostIPs
+	   Description: Downward API MUST expose Pod and Container fields as environment variables. Specify hostIPs as environment variable in the Pod Spec are visible at runtime in the container.
+	*/
+	framework.ConformanceIt("should provide hostIPs as an env var", f.WithNodeConformance(), func(ctx context.Context) {
+		podName := "downward-api-" + string(uuid.NewUUID())
+		env := []v1.EnvVar{
+			{
+				Name: "HOST_IP",
+				ValueFrom: &v1.EnvVarSource{
+					FieldRef: &v1.ObjectFieldSelector{
+						APIVersion: "v1",
+						FieldPath:  "status.hostIP",
+					},
+				},
+			},
+		}
+
+		expectations := []string{
+			fmt.Sprintf("HOST_IP=%v|%v", e2enetwork.RegexIPv4, e2enetwork.RegexIPv6),
+		}
+
+		testDownwardAPI(ctx, f, podName, env, expectations)
+	})
+
 	ginkgo.It("should provide host IP and pod IP as an env var if pod uses host network [LinuxOnly]", func(ctx context.Context) {
 		podName := "downward-api-" + string(uuid.NewUUID())
 		env := []v1.EnvVar{

test/e2e_node/pod_host_ips.go

@@ -24,20 +24,14 @@ import (
 	"github.com/onsi/gomega"
 
 	v1 "k8s.io/api/core/v1"
-	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/uuid"
 	netutils "k8s.io/utils/net"
 
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
-	kubefeatures "k8s.io/kubernetes/pkg/features"
 	utilnode "k8s.io/kubernetes/pkg/util/node"
 	"k8s.io/kubernetes/test/e2e/framework"
-	e2enetwork "k8s.io/kubernetes/test/e2e/framework/network"
 	e2enode "k8s.io/kubernetes/test/e2e/framework/node"
 	e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
-	e2epodoutput "k8s.io/kubernetes/test/e2e/framework/pod/output"
-	e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper"
 	"k8s.io/kubernetes/test/e2e/network/common"
 	imageutils "k8s.io/kubernetes/test/utils/image"
 	admissionapi "k8s.io/pod-security-admission/api"
@@ -109,31 +103,6 @@ var _ = common.SIGDescribe("Pod Host IPs", func() {
 			err = podClient.Delete(ctx, pod.Name, *metav1.NewDeleteOptions(1))
 			framework.ExpectNoError(err, "failed to delete pod")
 		})
-
-		ginkgo.It("should provide hostIPs as an env var", func(ctx context.Context) {
-			if !utilfeature.DefaultFeatureGate.Enabled(kubefeatures.PodHostIPs) {
-				e2eskipper.Skipf("PodHostIPs feature is not enabled")
-			}
-
-			podName := "downward-api-" + string(uuid.NewUUID())
-			env := []v1.EnvVar{
-				{
-					Name: "HOST_IPS",
-					ValueFrom: &v1.EnvVarSource{
-						FieldRef: &v1.ObjectFieldSelector{
-							APIVersion: "v1",
-							FieldPath:  "status.hostIPs",
-						},
-					},
-				},
-			}
-
-			expectations := []string{
-				fmt.Sprintf("HOST_IPS=%v|%v", e2enetwork.RegexIPv4, e2enetwork.RegexIPv6),
-			}
-
-			testDownwardAPI(ctx, f, podName, env, expectations)
-		})
 	})
 })
 
@@ -176,35 +145,3 @@ func genHostIPsForNode(ctx context.Context, f *framework.Framework, nodeName str
 	}
 	return nil, fmt.Errorf("no such node %q", nodeName)
 }
-
-func testDownwardAPI(ctx context.Context, f *framework.Framework, podName string, env []v1.EnvVar, expectations []string) {
-	pod := &v1.Pod{
-		ObjectMeta: metav1.ObjectMeta{
-			Name:   podName,
-			Labels: map[string]string{"name": podName},
-		},
-		Spec: v1.PodSpec{
-			Containers: []v1.Container{
-				{
-					Name:    "dapi-container",
-					Image:   imageutils.GetE2EImage(imageutils.BusyBox),
-					Command: []string{"sh", "-c", "env"},
-					Resources: v1.ResourceRequirements{
-						Requests: v1.ResourceList{
-							v1.ResourceCPU:    resource.MustParse("250m"),
-							v1.ResourceMemory: resource.MustParse("32Mi"),
-						},
-						Limits: v1.ResourceList{
-							v1.ResourceCPU:    resource.MustParse("1250m"),
-							v1.ResourceMemory: resource.MustParse("64Mi"),
-						},
-					},
-					Env: env,
-				},
-			},
-			RestartPolicy: v1.RestartPolicyNever,
-		},
-	}
-
-	e2epodoutput.TestContainerOutputRegexp(ctx, f, "downward api env vars", pod, 0, expectations)
-}

test/featuregates_linter/test_data/versioned_feature_list.yaml

@@ -872,20 +872,6 @@
     lockToDefault: true
     preRelease: GA
     version: "1.31"
-- name: PodHostIPs
-  versionedSpecs:
-  - default: false
-    lockToDefault: false
-    preRelease: Alpha
-    version: "1.28"
-  - default: true
-    lockToDefault: false
-    preRelease: Beta
-    version: "1.29"
-  - default: true
-    lockToDefault: true
-    preRelease: GA
-    version: "1.30"
 - name: PodIndexLabel
   versionedSpecs:
   - default: true