Partially revert "Include pod /etc/hosts in ephemeral storage calculation for eviction"

This reverts (most of) commit f34b586d01.

pkg/kubelet/eviction/BUILD

@@ -63,7 +63,6 @@ go_library(
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/resource:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
-        "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/clock:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
         "//staging/src/k8s.io/client-go/tools/record:go_default_library",

pkg/kubelet/eviction/eviction_manager.go

@@ -26,7 +26,6 @@ import (
 
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
-	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/clock"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/tools/record"
@@ -99,8 +98,6 @@ type managerImpl struct {
 	thresholdNotifiers []ThresholdNotifier
 	// thresholdsLastUpdated is the last time the thresholdNotifiers were updated.
 	thresholdsLastUpdated time.Time
-	// etcHostsPath is a function that will get the etc-hosts file's path for a pod given its UID
-	etcHostsPath func(podUID types.UID) string
 }
 
 // ensure it implements the required interface
@@ -117,7 +114,6 @@ func NewManager(
 	recorder record.EventRecorder,
 	nodeRef *v1.ObjectReference,
 	clock clock.Clock,
-	etcHostsPath func(types.UID) string,
 ) (Manager, lifecycle.PodAdmitHandler) {
 	manager := &managerImpl{
 		clock:                        clock,
@@ -133,7 +129,6 @@ func NewManager(
 		thresholdsFirstObservedAt:    thresholdsObservedAt{},
 		dedicatedImageFs:             nil,
 		thresholdNotifiers:           []ThresholdNotifier{},
-		etcHostsPath:                 etcHostsPath,
 	}
 	return manager, manager
 }

pkg/kubelet/eviction/helpers.go

@@ -18,7 +18,6 @@ package eviction
 
 import (
 	"fmt"
-	"os"
 	"sort"
 	"strconv"
 	"strings"
@@ -425,7 +424,7 @@ func localEphemeralVolumeNames(pod *v1.Pod) []string {
 }
 
 // podLocalEphemeralStorageUsage aggregates pod local ephemeral storage usage and inode consumption for the specified stats to measure.
-func podLocalEphemeralStorageUsage(podStats statsapi.PodStats, pod *v1.Pod, statsToMeasure []fsStatsType, etcHostsPath string) (v1.ResourceList, error) {
+func podLocalEphemeralStorageUsage(podStats statsapi.PodStats, pod *v1.Pod, statsToMeasure []fsStatsType) (v1.ResourceList, error) {
 	disk := resource.Quantity{Format: resource.BinarySI}
 	inodes := resource.Quantity{Format: resource.DecimalSI}
 
@@ -439,12 +438,6 @@ func podLocalEphemeralStorageUsage(podStats statsapi.PodStats, pod *v1.Pod, stat
 		disk.Add(podLocalVolumeUsageList[v1.ResourceEphemeralStorage])
 		inodes.Add(podLocalVolumeUsageList[resourceInodes])
 	}
-	if len(etcHostsPath) > 0 {
-		if stat, err := os.Stat(etcHostsPath); err == nil {
-			disk.Add(*resource.NewQuantity(int64(stat.Size()), resource.BinarySI))
-			inodes.Add(*resource.NewQuantity(int64(1), resource.DecimalSI))
-		}
-	}
 	return v1.ResourceList{
 		v1.ResourceEphemeralStorage: disk,
 		resourceInodes:              inodes,

pkg/kubelet/kubelet.go

@@ -740,9 +740,8 @@ func NewMainKubelet(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
 	klet.backOff = flowcontrol.NewBackOff(backOffPeriod, MaxContainerBackOff)
 	klet.podKiller = NewPodKiller(klet)
 
-	etcHostsPathFunc := func(podUID types.UID) string { return getEtcHostsPath(klet.getPodDir(podUID)) }
 	// setup eviction manager
-	evictionManager, evictionAdmitHandler := eviction.NewManager(klet.resourceAnalyzer, evictionConfig, killPodNow(klet.podWorkers, kubeDeps.Recorder), klet.podManager.GetMirrorPodByPod, klet.imageManager, klet.containerGC, kubeDeps.Recorder, nodeRef, klet.clock, etcHostsPathFunc)
+	evictionManager, evictionAdmitHandler := eviction.NewManager(klet.resourceAnalyzer, evictionConfig, killPodNow(klet.podWorkers, kubeDeps.Recorder), klet.podManager.GetMirrorPodByPod, klet.imageManager, klet.containerGC, kubeDeps.Recorder, nodeRef, klet.clock)
 
 	klet.evictionManager = evictionManager
 	klet.admitHandlers.AddPodAdmitHandler(evictionAdmitHandler)

pkg/kubelet/kubelet_test.go

@@ -293,9 +293,8 @@ func newTestKubeletWithImageList(
 		UID:       types.UID(kubelet.nodeName),
 		Namespace: "",
 	}
-	etcHostsPathFunc := func(podUID types.UID) string { return getEtcHostsPath(kubelet.getPodDir(podUID)) }
 	// setup eviction manager
-	evictionManager, evictionAdmitHandler := eviction.NewManager(kubelet.resourceAnalyzer, eviction.Config{}, killPodNow(kubelet.podWorkers, fakeRecorder), kubelet.podManager.GetMirrorPodByPod, kubelet.imageManager, kubelet.containerGC, fakeRecorder, nodeRef, kubelet.clock, etcHostsPathFunc)
+	evictionManager, evictionAdmitHandler := eviction.NewManager(kubelet.resourceAnalyzer, eviction.Config{}, killPodNow(kubelet.podWorkers, fakeRecorder), kubelet.podManager.GetMirrorPodByPod, kubelet.imageManager, kubelet.containerGC, fakeRecorder, nodeRef, kubelet.clock)
 
 	kubelet.evictionManager = evictionManager
 	kubelet.admitHandlers.AddPodAdmitHandler(evictionAdmitHandler)

pkg/kubelet/runonce_test.go

@@ -126,8 +126,7 @@ func TestRunOnce(t *testing.T) {
 		return nil
 	}
 	fakeMirrodPodFunc := func(*v1.Pod) (*v1.Pod, bool) { return nil, false }
-	etcHostsPathFunc := func(podUID types.UID) string { return getEtcHostsPath(kb.getPodDir(podUID)) }
+	evictionManager, evictionAdmitHandler := eviction.NewManager(kb.resourceAnalyzer, eviction.Config{}, fakeKillPodFunc, fakeMirrodPodFunc, nil, nil, kb.recorder, nodeRef, kb.clock)
-	evictionManager, evictionAdmitHandler := eviction.NewManager(kb.resourceAnalyzer, eviction.Config{}, fakeKillPodFunc, fakeMirrodPodFunc, nil, nil, kb.recorder, nodeRef, kb.clock, etcHostsPathFunc)
 
 	kb.evictionManager = evictionManager
 	kb.admitHandlers.AddPodAdmitHandler(evictionAdmitHandler)