Merge pull request #67709 from feiskyer/inodes-clean

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here: https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md.

 Kubelet: only apply default hard evictions of nodefs.inodesFree on Linux

**What this PR does / why we need it**:

Kubelet sets default hard evictions of `nodefs.inodesFree ` for all platforms today. This will cause errors on Windows and a lot `no observation found for eviction signal nodefs.inodesFree` errors will be logs for kubelet.

```
kubelet.err.log:4961:W0711 22:21:12.378789    2872 helpers.go:808] eviction manager: no observation found for eviction signal nodefs.inodesFree
kubelet.err.log:4967:W0711 22:21:30.411371    2872 helpers.go:808] eviction manager: no observation found for eviction signal nodefs.inodesFree
kubelet.err.log:4974:W0711 22:21:48.446456    2872 helpers.go:808] eviction manager: no observation found for eviction signal nodefs.inodesFree
kubelet.err.log:4978:W0711 22:22:06.482441    2872 helpers.go:808] eviction manager: no observation found for eviction signal nodefs.inodesFree
```

This PR updates the default hard eviction value and only apply nodefs.inodesFree on Linux.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #66088

**Special notes for your reviewer**:

**Release note**:

```release-note
Kubelet only applies default hard evictions of nodefs.inodesFree on Linux
```

pkg/kubelet/apis/config/fuzzer/fuzzer.go

@@ -81,12 +81,7 @@ func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
 			obj.KubeAPIQPS = 5
 			obj.KubeAPIBurst = 10
 			obj.HairpinMode = v1beta1.PromiscuousBridge
-			obj.EvictionHard = map[string]string{
-				"memory.available":  "100Mi",
-				"nodefs.available":  "10%",
-				"nodefs.inodesFree": "5%",
-				"imagefs.available": "15%",
-			}
+			obj.EvictionHard = kubeletconfigv1beta1.DefaultEvictionHard
 			obj.EvictionPressureTransitionPeriod = metav1.Duration{Duration: 5 * time.Minute}
 			obj.MakeIPTablesUtilChains = true
 			obj.IPTablesMasqueradeBit = kubeletconfigv1beta1.DefaultIPTablesMasqueradeBit

pkg/kubelet/apis/config/v1beta1/BUILD

@@ -9,6 +9,8 @@ go_library(
     name = "go_default_library",
     srcs = [
         "defaults.go",
+        "defaults_linux.go",
+        "defaults_others.go",
         "doc.go",
         "register.go",
         "zz_generated.conversion.go",

pkg/kubelet/apis/config/v1beta1/defaults.go

@@ -178,12 +178,7 @@ func SetDefaults_KubeletConfiguration(obj *kubeletconfigv1beta1.KubeletConfigura
 		obj.SerializeImagePulls = utilpointer.BoolPtr(true)
 	}
 	if obj.EvictionHard == nil {
-		obj.EvictionHard = map[string]string{
-			"memory.available":  "100Mi",
-			"nodefs.available":  "10%",
-			"nodefs.inodesFree": "5%",
-			"imagefs.available": "15%",
-		}
+		obj.EvictionHard = DefaultEvictionHard
 	}
 	if obj.EvictionPressureTransitionPeriod == zeroDuration {
 		obj.EvictionPressureTransitionPeriod = metav1.Duration{Duration: 5 * time.Minute}

pkg/kubelet/apis/config/v1beta1/defaults_linux.go

@@ -0,0 +1,27 @@
+// +build linux
+
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1beta1
+
+// DefaultEvictionHard includes default options for hard eviction.
+var DefaultEvictionHard = map[string]string{
+	"memory.available":  "100Mi",
+	"nodefs.available":  "10%",
+	"nodefs.inodesFree": "5%",
+	"imagefs.available": "15%",
+}

pkg/kubelet/apis/config/v1beta1/defaults_others.go

@@ -0,0 +1,26 @@
+// +build !linux
+
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1beta1
+
+// DefaultEvictionHard includes default options for hard eviction.
+var DefaultEvictionHard = map[string]string{
+	"memory.available":  "100Mi",
+	"nodefs.available":  "10%",
+	"imagefs.available": "15%",
+}

pkg/kubelet/dockershim/docker_image_windows.go

@@ -45,9 +45,8 @@ func (ds *dockerService) ImageFsInfo(_ context.Context, _ *runtimeapi.ImageFsInf
 
 	filesystems := []*runtimeapi.FilesystemUsage{
 		{
-			Timestamp:  time.Now().UnixNano(),
-			UsedBytes:  &runtimeapi.UInt64Value{Value: fsinfo.Usage},
-			InodesUsed: &runtimeapi.UInt64Value{Value: 0},
+			Timestamp: time.Now().UnixNano(),
+			UsedBytes: &runtimeapi.UInt64Value{Value: fsinfo.Usage},
 			FsId: &runtimeapi.FilesystemIdentifier{
 				Mountpoint: info.DockerRootDir,
 			},

pkg/kubelet/stats/cri_stats_provider.go

@@ -182,9 +182,11 @@ func (p *criStatsProvider) ImageFsStats() (*statsapi.FsStats, error) {
 	// TODO(yguo0905): Support returning stats of multiple image filesystems.
 	for _, fs := range resp {
 		s := &statsapi.FsStats{
-			Time:       metav1.NewTime(time.Unix(0, fs.Timestamp)),
-			UsedBytes:  &fs.UsedBytes.Value,
-			InodesUsed: &fs.InodesUsed.Value,
+			Time:      metav1.NewTime(time.Unix(0, fs.Timestamp)),
+			UsedBytes: &fs.UsedBytes.Value,
+		}
+		if fs.InodesUsed != nil {
+			s.InodesUsed = &fs.InodesUsed.Value
 		}
 		imageFsInfo := p.getFsInfo(fs.GetFsId())
 		if imageFsInfo != nil {