kubernetes hollow-node 源码
kubernetes hollow-node 代码
文件路径：/cmd/kubemark/hollow-node.go
/*
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 main
import (
"context"
"errors"
goflag "flag"
"fmt"
"os"
"time"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
oteltrace "go.opentelemetry.io/otel/trace"
internalapi "k8s.io/cri-api/pkg/apis"
"k8s.io/klog/v2"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
clientset "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/events"
"k8s.io/component-base/cli"
cliflag "k8s.io/component-base/cli/flag"
_ "k8s.io/component-base/metrics/prometheus/restclient" // for client metric registration
_ "k8s.io/component-base/metrics/prometheus/version" // for version metric registration
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
fakesysctl "k8s.io/component-helpers/node/util/sysctl/testing"
"k8s.io/kubernetes/pkg/api/legacyscheme"
"k8s.io/kubernetes/pkg/cluster/ports"
cadvisortest "k8s.io/kubernetes/pkg/kubelet/cadvisor/testing"
"k8s.io/kubernetes/pkg/kubelet/certificate/bootstrap"
"k8s.io/kubernetes/pkg/kubelet/cm"
"k8s.io/kubernetes/pkg/kubelet/cri/remote"
fakeremote "k8s.io/kubernetes/pkg/kubelet/cri/remote/fake"
"k8s.io/kubernetes/pkg/kubemark"
utilflag "k8s.io/kubernetes/pkg/util/flag"
fakeiptables "k8s.io/kubernetes/pkg/util/iptables/testing"
fakeexec "k8s.io/utils/exec/testing"
)
type hollowNodeConfig struct {
KubeconfigPath string
BootstrapKubeconfigPath string
CertDirectory string
KubeletPort int
KubeletReadOnlyPort int
Morph string
NodeName string
ServerPort int
ContentType string
UseRealProxier bool
ProxierSyncPeriod time.Duration
ProxierMinSyncPeriod time.Duration
NodeLabels map[string]string
RegisterWithTaints []v1.Taint
MaxPods int
ExtendedResources map[string]string
UseHostImageService bool
}
const (
maxPods = 110
podsPerCore = 0
)
// TODO(#45650): Refactor hollow-node into hollow-kubelet and hollow-proxy
// and make the config driven.
var knownMorphs = sets.NewString("kubelet", "proxy")
func (c *hollowNodeConfig) addFlags(fs *pflag.FlagSet) {
fs.StringVar(&c.KubeconfigPath, "kubeconfig", "/kubeconfig/kubeconfig", "Path to kubeconfig file.")
fs.StringVar(&c.BootstrapKubeconfigPath, "bootstrap-kubeconfig", "", "Path to bootstrap kubeconfig file.")
fs.StringVar(&c.CertDirectory, "cert-dir", "/etc/srv/", "Path to cert directory for bootstraping.")
fs.IntVar(&c.KubeletPort, "kubelet-port", ports.KubeletPort, "Port on which HollowKubelet should be listening.")
fs.IntVar(&c.KubeletReadOnlyPort, "kubelet-read-only-port", ports.KubeletReadOnlyPort, "Read-only port on which Kubelet is listening.")
fs.StringVar(&c.NodeName, "name", "fake-node", "Name of this Hollow Node.")
fs.IntVar(&c.ServerPort, "api-server-port", 443, "Port on which API server is listening.")
fs.StringVar(&c.Morph, "morph", "", fmt.Sprintf("Specifies into which Hollow component this binary should morph. Allowed values: %v", knownMorphs.List()))
fs.StringVar(&c.ContentType, "kube-api-content-type", "application/vnd.kubernetes.protobuf", "ContentType of requests sent to apiserver.")
fs.BoolVar(&c.UseRealProxier, "use-real-proxier", true, "Set to true if you want to use real proxier inside hollow-proxy.")
fs.DurationVar(&c.ProxierSyncPeriod, "proxier-sync-period", 30*time.Second, "Period that proxy rules are refreshed in hollow-proxy.")
fs.DurationVar(&c.ProxierMinSyncPeriod, "proxier-min-sync-period", 0, "Minimum period that proxy rules are refreshed in hollow-proxy.")
bindableNodeLabels := cliflag.ConfigurationMap(c.NodeLabels)
fs.Var(&bindableNodeLabels, "node-labels", "Additional node labels")
fs.Var(utilflag.RegisterWithTaintsVar{Value: &c.RegisterWithTaints}, "register-with-taints", "Register the node with the given list of taints (comma separated \"<key>=<value>:<effect>\"). No-op if register-node is false.")
fs.IntVar(&c.MaxPods, "max-pods", maxPods, "Number of pods that can run on this Kubelet.")
bindableExtendedResources := cliflag.ConfigurationMap(c.ExtendedResources)
fs.Var(&bindableExtendedResources, "extended-resources", "Register the node with extended resources (comma separated \"<name>=<quantity>\")")
fs.BoolVar(&c.UseHostImageService, "use-host-image-service", true, "Set to true if the hollow-kubelet should use the host image service. If set to false the fake image service will be used")
}
func (c *hollowNodeConfig) createClientConfigFromFile() (*restclient.Config, error) {
clientConfig, err := clientcmd.LoadFromFile(c.KubeconfigPath)
if err != nil {
return nil, fmt.Errorf("error while loading kubeconfig from file %v: %v", c.KubeconfigPath, err)
}
config, err := clientcmd.NewDefaultClientConfig(*clientConfig, &clientcmd.ConfigOverrides{}).ClientConfig()
if err != nil {
return nil, fmt.Errorf("error while creating kubeconfig: %v", err)
}
config.ContentType = c.ContentType
config.QPS = 10
config.Burst = 20
return config, nil
}
func (c *hollowNodeConfig) bootstrapClientConfig() error {
if c.BootstrapKubeconfigPath != "" {
return bootstrap.LoadClientCert(context.TODO(), c.KubeconfigPath, c.BootstrapKubeconfigPath, c.CertDirectory, types.NodeName(c.NodeName))
}
return nil
}
func (c *hollowNodeConfig) createHollowKubeletOptions() *kubemark.HollowKubletOptions {
return &kubemark.HollowKubletOptions{
NodeName: c.NodeName,
KubeletPort: c.KubeletPort,
KubeletReadOnlyPort: c.KubeletReadOnlyPort,
MaxPods: c.MaxPods,
PodsPerCore: podsPerCore,
NodeLabels: c.NodeLabels,
RegisterWithTaints: c.RegisterWithTaints,
}
}
func main() {
command := newHollowNodeCommand()
code := cli.Run(command)
os.Exit(code)
}
// newControllerManagerCommand creates a *cobra.Command object with default parameters
func newHollowNodeCommand() *cobra.Command {
s := &hollowNodeConfig{
NodeLabels: make(map[string]string),
ExtendedResources: make(map[string]string),
}
cmd := &cobra.Command{
Use: "kubemark",
Long: "kubemark",
RunE: func(cmd *cobra.Command, args []string) error {
verflag.PrintAndExitIfRequested()
return run(cmd, s)
},
Args: func(cmd *cobra.Command, args []string) error {
for _, arg := range args {
if len(arg) > 0 {
return fmt.Errorf("%q does not take any arguments, got %q", cmd.CommandPath(), args)
}
}
return nil
},
}
fs := cmd.Flags()
fs.AddGoFlagSet(goflag.CommandLine) // for flags like --docker-only
s.addFlags(fs)
return cmd
}
func run(cmd *cobra.Command, config *hollowNodeConfig) error {
// To help debugging, immediately log version and print flags.
klog.Infof("Version: %+v", version.Get())
cliflag.PrintFlags(cmd.Flags())
if !knownMorphs.Has(config.Morph) {
return fmt.Errorf("Unknown morph: %v. allowed values: %v", config.Morph, knownMorphs.List())
}
// create a client to communicate with API server.
err := config.bootstrapClientConfig()
if err != nil {
return fmt.Errorf("Failed to bootstrap, error: %w. Exiting", err)
}
clientConfig, err := config.createClientConfigFromFile()
if err != nil {
return fmt.Errorf("Failed to create a ClientConfig, error: %w. Exiting", err)
}
if config.Morph == "kubelet" {
clientConfig.UserAgent = "hollow-kubelet"
client, err := clientset.NewForConfig(clientConfig)
if err != nil {
return fmt.Errorf("Failed to create a ClientSet, error: %w. Exiting", err)
}
f, c := kubemark.GetHollowKubeletConfig(config.createHollowKubeletOptions())
heartbeatClientConfig := *clientConfig
heartbeatClientConfig.Timeout = c.NodeStatusUpdateFrequency.Duration
// The timeout is the minimum of the lease duration and status update frequency
leaseTimeout := time.Duration(c.NodeLeaseDurationSeconds) * time.Second
if heartbeatClientConfig.Timeout > leaseTimeout {
heartbeatClientConfig.Timeout = leaseTimeout
}
heartbeatClientConfig.QPS = float32(-1)
heartbeatClient, err := clientset.NewForConfig(&heartbeatClientConfig)
if err != nil {
return fmt.Errorf("Failed to create a ClientSet, error: %w. Exiting", err)
}
cadvisorInterface := &cadvisortest.Fake{
NodeName: config.NodeName,
}
var containerManager cm.ContainerManager
if config.ExtendedResources != nil {
extendedResources := v1.ResourceList{}
for k, v := range config.ExtendedResources {
extendedResources[v1.ResourceName(k)] = resource.MustParse(v)
}
containerManager = cm.NewStubContainerManagerWithDevicePluginResource(extendedResources)
} else {
containerManager = cm.NewStubContainerManager()
}
endpoint, err := fakeremote.GenerateEndpoint()
if err != nil {
return fmt.Errorf("Failed to generate fake endpoint, error: %w", err)
}
fakeRemoteRuntime := fakeremote.NewFakeRemoteRuntime()
if err = fakeRemoteRuntime.Start(endpoint); err != nil {
return fmt.Errorf("Failed to start fake runtime, error: %w", err)
}
defer fakeRemoteRuntime.Stop()
runtimeService, err := remote.NewRemoteRuntimeService(endpoint, 15*time.Second, oteltrace.NewNoopTracerProvider())
if err != nil {
return fmt.Errorf("Failed to init runtime service, error: %w", err)
}
var imageService internalapi.ImageManagerService = fakeRemoteRuntime.ImageService
if config.UseHostImageService {
imageService, err = remote.NewRemoteImageService(f.RemoteImageEndpoint, 15*time.Second)
if err != nil {
return fmt.Errorf("Failed to init image service, error: %w", err)
}
}
hollowKubelet := kubemark.NewHollowKubelet(
f, c,
client,
heartbeatClient,
cadvisorInterface,
imageService,
runtimeService,
containerManager,
)
hollowKubelet.Run()
}
if config.Morph == "proxy" {
clientConfig.UserAgent = "hollow-proxy"
client, err := clientset.NewForConfig(clientConfig)
if err != nil {
return fmt.Errorf("Failed to create API Server client, error: %w", err)
}
iptInterface := fakeiptables.NewFake()
sysctl := fakesysctl.NewFake()
execer := &fakeexec.FakeExec{
LookPathFunc: func(_ string) (string, error) { return "", errors.New("fake execer") },
}
eventBroadcaster := events.NewBroadcaster(&events.EventSinkImpl{Interface: client.EventsV1()})
recorder := eventBroadcaster.NewRecorder(legacyscheme.Scheme, "kube-proxy")
hollowProxy, err := kubemark.NewHollowProxyOrDie(
config.NodeName,
client,
client.CoreV1(),
iptInterface,
sysctl,
execer,
eventBroadcaster,
recorder,
config.UseRealProxier,
config.ProxierSyncPeriod,
config.ProxierMinSyncPeriod,
)
if err != nil {
return fmt.Errorf("Failed to create hollowProxy instance, error: %w", err)
}
return hollowProxy.Run()
}
return nil
}
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