299 lines
10 KiB
Go
299 lines
10 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"errors"
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goflag "flag"
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"fmt"
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"math/rand"
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"os"
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"time"
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"github.com/spf13/cobra"
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"github.com/spf13/pflag"
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internalapi "k8s.io/cri-api/pkg/apis"
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"k8s.io/klog/v2"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/resource"
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"k8s.io/apimachinery/pkg/util/sets"
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clientset "k8s.io/client-go/kubernetes"
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restclient "k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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"k8s.io/client-go/tools/record"
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cliflag "k8s.io/component-base/cli/flag"
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"k8s.io/component-base/logs"
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_ "k8s.io/component-base/metrics/prometheus/restclient" // for client metric registration
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_ "k8s.io/component-base/metrics/prometheus/version" // for version metric registration
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"k8s.io/component-base/version"
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"k8s.io/component-base/version/verflag"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/cluster/ports"
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cadvisortest "k8s.io/kubernetes/pkg/kubelet/cadvisor/testing"
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"k8s.io/kubernetes/pkg/kubelet/cm"
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"k8s.io/kubernetes/pkg/kubelet/cri/remote"
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fakeremote "k8s.io/kubernetes/pkg/kubelet/cri/remote/fake"
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"k8s.io/kubernetes/pkg/kubemark"
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fakeiptables "k8s.io/kubernetes/pkg/util/iptables/testing"
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fakesysctl "k8s.io/kubernetes/pkg/util/sysctl/testing"
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utiltaints "k8s.io/kubernetes/pkg/util/taints"
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fakeexec "k8s.io/utils/exec/testing"
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)
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type hollowNodeConfig struct {
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KubeconfigPath string
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KubeletPort int
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KubeletReadOnlyPort int
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Morph string
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NodeName string
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ServerPort int
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ContentType string
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UseRealProxier bool
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ProxierSyncPeriod time.Duration
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ProxierMinSyncPeriod time.Duration
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NodeLabels map[string]string
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RegisterWithTaints []core.Taint
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MaxPods int
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ExtendedResources map[string]string
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UseHostImageService bool
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}
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const (
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maxPods = 110
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podsPerCore = 0
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)
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// TODO(#45650): Refactor hollow-node into hollow-kubelet and hollow-proxy
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// and make the config driven.
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var knownMorphs = sets.NewString("kubelet", "proxy")
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func (c *hollowNodeConfig) addFlags(fs *pflag.FlagSet) {
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fs.StringVar(&c.KubeconfigPath, "kubeconfig", "/kubeconfig/kubeconfig", "Path to kubeconfig file.")
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fs.IntVar(&c.KubeletPort, "kubelet-port", ports.KubeletPort, "Port on which HollowKubelet should be listening.")
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fs.IntVar(&c.KubeletReadOnlyPort, "kubelet-read-only-port", ports.KubeletReadOnlyPort, "Read-only port on which Kubelet is listening.")
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fs.StringVar(&c.NodeName, "name", "fake-node", "Name of this Hollow Node.")
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fs.IntVar(&c.ServerPort, "api-server-port", 443, "Port on which API server is listening.")
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fs.StringVar(&c.Morph, "morph", "", fmt.Sprintf("Specifies into which Hollow component this binary should morph. Allowed values: %v", knownMorphs.List()))
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fs.StringVar(&c.ContentType, "kube-api-content-type", "application/vnd.kubernetes.protobuf", "ContentType of requests sent to apiserver.")
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fs.BoolVar(&c.UseRealProxier, "use-real-proxier", true, "Set to true if you want to use real proxier inside hollow-proxy.")
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fs.DurationVar(&c.ProxierSyncPeriod, "proxier-sync-period", 30*time.Second, "Period that proxy rules are refreshed in hollow-proxy.")
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fs.DurationVar(&c.ProxierMinSyncPeriod, "proxier-min-sync-period", 0, "Minimum period that proxy rules are refreshed in hollow-proxy.")
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bindableNodeLabels := cliflag.ConfigurationMap(c.NodeLabels)
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fs.Var(&bindableNodeLabels, "node-labels", "Additional node labels")
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fs.Var(utiltaints.NewTaintsVar(&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.")
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fs.IntVar(&c.MaxPods, "max-pods", maxPods, "Number of pods that can run on this Kubelet.")
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bindableExtendedResources := cliflag.ConfigurationMap(c.ExtendedResources)
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fs.Var(&bindableExtendedResources, "extended-resources", "Register the node with extended resources (comma separated \"<name>=<quantity>\")")
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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")
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}
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func (c *hollowNodeConfig) createClientConfigFromFile() (*restclient.Config, error) {
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clientConfig, err := clientcmd.LoadFromFile(c.KubeconfigPath)
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if err != nil {
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return nil, fmt.Errorf("error while loading kubeconfig from file %v: %v", c.KubeconfigPath, err)
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}
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config, err := clientcmd.NewDefaultClientConfig(*clientConfig, &clientcmd.ConfigOverrides{}).ClientConfig()
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if err != nil {
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return nil, fmt.Errorf("error while creating kubeconfig: %v", err)
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}
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config.ContentType = c.ContentType
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config.QPS = 10
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config.Burst = 20
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return config, nil
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}
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func (c *hollowNodeConfig) createHollowKubeletOptions() *kubemark.HollowKubletOptions {
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return &kubemark.HollowKubletOptions{
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NodeName: c.NodeName,
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KubeletPort: c.KubeletPort,
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KubeletReadOnlyPort: c.KubeletReadOnlyPort,
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MaxPods: c.MaxPods,
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PodsPerCore: podsPerCore,
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NodeLabels: c.NodeLabels,
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RegisterWithTaints: c.RegisterWithTaints,
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}
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}
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func main() {
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rand.Seed(time.Now().UnixNano())
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command := newHollowNodeCommand()
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// TODO: once we switch everything over to Cobra commands, we can go back to calling
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// cliflag.InitFlags() (by removing its pflag.Parse() call). For now, we have to set the
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// normalize func and add the go flag set by hand.
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pflag.CommandLine.SetNormalizeFunc(cliflag.WordSepNormalizeFunc)
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pflag.CommandLine.AddGoFlagSet(goflag.CommandLine)
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// cliflag.InitFlags()
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logs.InitLogs()
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defer logs.FlushLogs()
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if err := command.Execute(); err != nil {
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os.Exit(1)
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}
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}
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// newControllerManagerCommand creates a *cobra.Command object with default parameters
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func newHollowNodeCommand() *cobra.Command {
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s := &hollowNodeConfig{
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NodeLabels: make(map[string]string),
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ExtendedResources: make(map[string]string),
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}
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cmd := &cobra.Command{
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Use: "kubemark",
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Long: "kubemark",
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Run: func(cmd *cobra.Command, args []string) {
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verflag.PrintAndExitIfRequested()
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run(cmd, s)
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},
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Args: func(cmd *cobra.Command, args []string) error {
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for _, arg := range args {
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if len(arg) > 0 {
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return fmt.Errorf("%q does not take any arguments, got %q", cmd.CommandPath(), args)
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}
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}
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return nil
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},
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}
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s.addFlags(cmd.Flags())
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return cmd
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}
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func run(cmd *cobra.Command, config *hollowNodeConfig) {
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// To help debugging, immediately log version and print flags.
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klog.Infof("Version: %+v", version.Get())
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cliflag.PrintFlags(cmd.Flags())
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if !knownMorphs.Has(config.Morph) {
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klog.Fatalf("Unknown morph: %v. Allowed values: %v", config.Morph, knownMorphs.List())
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}
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// create a client to communicate with API server.
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clientConfig, err := config.createClientConfigFromFile()
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if err != nil {
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klog.Fatalf("Failed to create a ClientConfig: %v. Exiting.", err)
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}
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client, err := clientset.NewForConfig(clientConfig)
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if err != nil {
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klog.Fatalf("Failed to create a ClientSet: %v. Exiting.", err)
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}
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if config.Morph == "kubelet" {
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f, c := kubemark.GetHollowKubeletConfig(config.createHollowKubeletOptions())
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heartbeatClientConfig := *clientConfig
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heartbeatClientConfig.Timeout = c.NodeStatusUpdateFrequency.Duration
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// The timeout is the minimum of the lease duration and status update frequency
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leaseTimeout := time.Duration(c.NodeLeaseDurationSeconds) * time.Second
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if heartbeatClientConfig.Timeout > leaseTimeout {
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heartbeatClientConfig.Timeout = leaseTimeout
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}
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heartbeatClientConfig.QPS = float32(-1)
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heartbeatClient, err := clientset.NewForConfig(&heartbeatClientConfig)
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if err != nil {
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klog.Fatalf("Failed to create a ClientSet: %v. Exiting.", err)
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}
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cadvisorInterface := &cadvisortest.Fake{
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NodeName: config.NodeName,
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}
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var containerManager cm.ContainerManager
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if config.ExtendedResources != nil {
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extendedResources := v1.ResourceList{}
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for k, v := range config.ExtendedResources {
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extendedResources[v1.ResourceName(k)] = resource.MustParse(v)
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}
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containerManager = cm.NewStubContainerManagerWithDevicePluginResource(extendedResources)
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} else {
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containerManager = cm.NewStubContainerManager()
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}
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endpoint, err := fakeremote.GenerateEndpoint()
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if err != nil {
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klog.Fatalf("Failed to generate fake endpoint %v.", err)
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}
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fakeRemoteRuntime := fakeremote.NewFakeRemoteRuntime()
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if err = fakeRemoteRuntime.Start(endpoint); err != nil {
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klog.Fatalf("Failed to start fake runtime %v.", err)
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}
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defer fakeRemoteRuntime.Stop()
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runtimeService, err := remote.NewRemoteRuntimeService(endpoint, 15*time.Second)
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if err != nil {
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klog.Fatalf("Failed to init runtime service %v.", err)
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}
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var imageService internalapi.ImageManagerService = fakeRemoteRuntime.ImageService
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if config.UseHostImageService {
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imageService, err = remote.NewRemoteImageService(f.RemoteImageEndpoint, 15*time.Second)
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if err != nil {
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klog.Fatalf("Failed to init image service %v.", err)
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}
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}
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hollowKubelet := kubemark.NewHollowKubelet(
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f, c,
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client,
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heartbeatClient,
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cadvisorInterface,
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imageService,
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runtimeService,
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containerManager,
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)
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hollowKubelet.Run()
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}
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if config.Morph == "proxy" {
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client, err := clientset.NewForConfig(clientConfig)
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if err != nil {
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klog.Fatalf("Failed to create API Server client: %v", err)
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}
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iptInterface := fakeiptables.NewFake()
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sysctl := fakesysctl.NewFake()
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execer := &fakeexec.FakeExec{
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LookPathFunc: func(_ string) (string, error) { return "", errors.New("fake execer") },
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}
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eventBroadcaster := record.NewBroadcaster()
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recorder := eventBroadcaster.NewRecorder(legacyscheme.Scheme, v1.EventSource{Component: "kube-proxy", Host: config.NodeName})
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hollowProxy, err := kubemark.NewHollowProxyOrDie(
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config.NodeName,
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client,
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client.CoreV1(),
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iptInterface,
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sysctl,
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execer,
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eventBroadcaster,
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recorder,
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config.UseRealProxier,
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config.ProxierSyncPeriod,
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config.ProxierMinSyncPeriod,
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)
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if err != nil {
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klog.Fatalf("Failed to create hollowProxy instance: %v", err)
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}
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hollowProxy.Run()
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}
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}
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