/
hollow_kubelet.go
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/
hollow_kubelet.go
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/*
Copyright 2015 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 kubemark
import (
"fmt"
"time"
"k8s.io/klog/v2"
"k8s.io/mount-utils"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientset "k8s.io/client-go/kubernetes"
internalapi "k8s.io/cri-api/pkg/apis"
kubeletapp "k8s.io/kubernetes/cmd/kubelet/app"
"k8s.io/kubernetes/cmd/kubelet/app/options"
"k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/kubelet"
kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/cm"
containertest "k8s.io/kubernetes/pkg/kubelet/container/testing"
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/util/oom"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/cephfs"
"k8s.io/kubernetes/pkg/volume/configmap"
"k8s.io/kubernetes/pkg/volume/csi"
"k8s.io/kubernetes/pkg/volume/downwardapi"
"k8s.io/kubernetes/pkg/volume/emptydir"
"k8s.io/kubernetes/pkg/volume/fc"
"k8s.io/kubernetes/pkg/volume/flocker"
"k8s.io/kubernetes/pkg/volume/git_repo"
"k8s.io/kubernetes/pkg/volume/glusterfs"
"k8s.io/kubernetes/pkg/volume/hostpath"
"k8s.io/kubernetes/pkg/volume/iscsi"
"k8s.io/kubernetes/pkg/volume/local"
"k8s.io/kubernetes/pkg/volume/nfs"
"k8s.io/kubernetes/pkg/volume/portworx"
"k8s.io/kubernetes/pkg/volume/projected"
"k8s.io/kubernetes/pkg/volume/quobyte"
"k8s.io/kubernetes/pkg/volume/rbd"
"k8s.io/kubernetes/pkg/volume/scaleio"
"k8s.io/kubernetes/pkg/volume/secret"
"k8s.io/kubernetes/pkg/volume/storageos"
"k8s.io/kubernetes/pkg/volume/util/hostutil"
"k8s.io/kubernetes/pkg/volume/util/subpath"
"k8s.io/kubernetes/test/utils"
)
type HollowKubelet struct {
KubeletFlags *options.KubeletFlags
KubeletConfiguration *kubeletconfig.KubeletConfiguration
KubeletDeps *kubelet.Dependencies
}
func volumePlugins() []volume.VolumePlugin {
allPlugins := []volume.VolumePlugin{}
allPlugins = append(allPlugins, emptydir.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, git_repo.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, hostpath.ProbeVolumePlugins(volume.VolumeConfig{})...)
allPlugins = append(allPlugins, nfs.ProbeVolumePlugins(volume.VolumeConfig{})...)
allPlugins = append(allPlugins, secret.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, iscsi.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, glusterfs.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, rbd.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, quobyte.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, cephfs.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, downwardapi.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, fc.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, flocker.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, configmap.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, projected.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, portworx.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, scaleio.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, local.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, storageos.ProbeVolumePlugins()...)
allPlugins = append(allPlugins, csi.ProbeVolumePlugins()...)
return allPlugins
}
func NewHollowKubelet(
flags *options.KubeletFlags,
config *kubeletconfig.KubeletConfiguration,
client *clientset.Clientset,
heartbeatClient *clientset.Clientset,
cadvisorInterface cadvisor.Interface,
imageService internalapi.ImageManagerService,
runtimeService internalapi.RuntimeService,
containerManager cm.ContainerManager) *HollowKubelet {
d := &kubelet.Dependencies{
KubeClient: client,
HeartbeatClient: heartbeatClient,
RemoteRuntimeService: runtimeService,
RemoteImageService: imageService,
CAdvisorInterface: cadvisorInterface,
Cloud: nil,
OSInterface: &containertest.FakeOS{},
ContainerManager: containerManager,
VolumePlugins: volumePlugins(),
TLSOptions: nil,
OOMAdjuster: oom.NewFakeOOMAdjuster(),
Mounter: &mount.FakeMounter{},
Subpather: &subpath.FakeSubpath{},
HostUtil: hostutil.NewFakeHostUtil(nil),
}
return &HollowKubelet{
KubeletFlags: flags,
KubeletConfiguration: config,
KubeletDeps: d,
}
}
// Starts this HollowKubelet and blocks.
func (hk *HollowKubelet) Run() {
if err := kubeletapp.RunKubelet(&options.KubeletServer{
KubeletFlags: *hk.KubeletFlags,
KubeletConfiguration: *hk.KubeletConfiguration,
}, hk.KubeletDeps, false); err != nil {
klog.Fatalf("Failed to run HollowKubelet: %v. Exiting.", err)
}
select {}
}
// HollowKubletOptions contains settable parameters for hollow kubelet.
type HollowKubletOptions struct {
NodeName string
KubeletPort int
KubeletReadOnlyPort int
MaxPods int
PodsPerCore int
NodeLabels map[string]string
RegisterWithTaints []core.Taint
}
// Builds a KubeletConfiguration for the HollowKubelet, ensuring that the
// usual defaults are applied for fields we do not override.
func GetHollowKubeletConfig(opt *HollowKubletOptions) (*options.KubeletFlags, *kubeletconfig.KubeletConfiguration) {
testRootDir := utils.MakeTempDirOrDie("hollow-kubelet.", "")
podFilePath := utils.MakeTempDirOrDie("static-pods", testRootDir)
klog.Infof("Using %s as root dir for hollow-kubelet", testRootDir)
// Flags struct
f := options.NewKubeletFlags()
f.RootDirectory = testRootDir
f.HostnameOverride = opt.NodeName
f.MinimumGCAge = metav1.Duration{Duration: 1 * time.Minute}
f.MaxContainerCount = 100
f.MaxPerPodContainerCount = 2
f.NodeLabels = opt.NodeLabels
f.ContainerRuntimeOptions.ContainerRuntime = kubetypes.RemoteContainerRuntime
f.RegisterNode = true
f.RegisterSchedulable = true
f.RegisterWithTaints = opt.RegisterWithTaints
// Config struct
c, err := options.NewKubeletConfiguration()
if err != nil {
panic(err)
}
c.StaticPodURL = ""
c.EnableServer = true
c.Address = "0.0.0.0" /* bind address */
c.Port = int32(opt.KubeletPort)
c.ReadOnlyPort = int32(opt.KubeletReadOnlyPort)
c.StaticPodPath = podFilePath
c.FileCheckFrequency.Duration = 20 * time.Second
c.HTTPCheckFrequency.Duration = 20 * time.Second
c.NodeStatusUpdateFrequency.Duration = 10 * time.Second
c.NodeStatusReportFrequency.Duration = 5 * time.Minute
c.SyncFrequency.Duration = 10 * time.Second
c.EvictionPressureTransitionPeriod.Duration = 5 * time.Minute
c.MaxPods = int32(opt.MaxPods)
c.PodsPerCore = int32(opt.PodsPerCore)
c.ClusterDNS = []string{}
c.ImageGCHighThresholdPercent = 90
c.ImageGCLowThresholdPercent = 80
c.ProviderID = fmt.Sprintf("kubemark://%v", opt.NodeName)
c.VolumeStatsAggPeriod.Duration = time.Minute
c.CgroupRoot = ""
c.CPUCFSQuota = true
c.EnableControllerAttachDetach = false
c.EnableDebuggingHandlers = true
c.CgroupsPerQOS = false
// hairpin-veth is used to allow hairpin packets. Note that this deviates from
// what the "real" kubelet currently does, because there's no way to
// set promiscuous mode on docker0.
c.HairpinMode = kubeletconfig.HairpinVeth
c.MaxOpenFiles = 1024
c.RegistryBurst = 10
c.RegistryPullQPS = 5.0
c.ResolverConfig = kubetypes.ResolvConfDefault
c.KubeletCgroups = "/kubelet"
c.SerializeImagePulls = true
c.SystemCgroups = ""
c.ProtectKernelDefaults = false
return f, c
}