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introduce gardener-node-agent gardener#8023
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| // Copyright 2023 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file | ||
| // | ||
| // 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 app | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io/fs" | ||
| "os" | ||
| "path/filepath" | ||
| "time" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| "github.com/spf13/afero" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/pflag" | ||
| "go.uber.org/automaxprocs/maxprocs" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/client-go/rest" | ||
| configlatest "k8s.io/client-go/tools/clientcmd/api/latest" | ||
| clientcmdv1 "k8s.io/client-go/tools/clientcmd/api/v1" | ||
| "k8s.io/component-base/version" | ||
| "k8s.io/component-base/version/verflag" | ||
| "k8s.io/klog/v2" | ||
| "k8s.io/utils/pointer" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| controllerconfigv1alpha1 "sigs.k8s.io/controller-runtime/pkg/config/v1alpha1" | ||
| "sigs.k8s.io/controller-runtime/pkg/healthz" | ||
| logf "sigs.k8s.io/controller-runtime/pkg/log" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager" | ||
|
|
||
| "github.com/gardener/gardener/pkg/client/kubernetes" | ||
| "github.com/gardener/gardener/pkg/component/extensions/operatingsystemconfig/downloader" | ||
| "github.com/gardener/gardener/pkg/component/extensions/operatingsystemconfig/original/components/kubelet" | ||
| "github.com/gardener/gardener/pkg/features" | ||
| gardenerhealthz "github.com/gardener/gardener/pkg/healthz" | ||
| "github.com/gardener/gardener/pkg/logger" | ||
| nodeagentv1alpha1 "github.com/gardener/gardener/pkg/nodeagent/apis/config/v1alpha1" | ||
| "github.com/gardener/gardener/pkg/nodeagent/bootstrap" | ||
| "github.com/gardener/gardener/pkg/nodeagent/controller" | ||
| "github.com/gardener/gardener/pkg/nodeagent/controller/common" | ||
| "github.com/gardener/gardener/pkg/nodeagent/dbus" | ||
| ) | ||
|
|
||
| // Name is a const for the name of this component. | ||
| const Name = "gardener-node-agent" | ||
|
|
||
| // NewCommand creates a new cobra.Command for running gardener-node-agent. | ||
| func NewCommand() *cobra.Command { | ||
| opts := &options{} | ||
|
|
||
| cmd := &cobra.Command{ | ||
| Use: Name, | ||
| Short: "Launch the " + Name, | ||
| Args: cobra.NoArgs, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| verflag.PrintAndExitIfRequested() | ||
|
|
||
| // TODO: Make log level and format configurable: | ||
| // log, err := logger.NewZapLogger(opts.config.LogLevel, opts.config.LogFormat) | ||
| log, err := logger.NewZapLogger(logger.DebugLevel, logger.FormatJSON) | ||
| if err != nil { | ||
| return fmt.Errorf("error instantiating zap logger: %w", err) | ||
| } | ||
| if err := opts.validate(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| logf.SetLogger(log) | ||
| klog.SetLogger(log) | ||
|
|
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| log.Info("Starting "+Name, "version", version.Get()) | ||
| cmd.Flags().VisitAll(func(flag *pflag.Flag) { | ||
| log.Info(fmt.Sprintf("FLAG: --%s=%s", flag.Name, flag.Value)) //nolint:logcheck | ||
| }) | ||
|
|
||
| // don't output usage on further errors raised during execution | ||
| cmd.SilenceUsage = true | ||
| // further errors will be logged properly, don't duplicate | ||
| cmd.SilenceErrors = true | ||
|
|
||
| return run(cmd.Context(), log) | ||
| }, | ||
| } | ||
|
|
||
| bootstrapCmd := &cobra.Command{ | ||
| Use: "bootstrap", | ||
| Short: "bootstrap the " + Name, | ||
| Args: cobra.NoArgs, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| // TODO: Make log level and format configurable: | ||
| // log, err := logger.NewZapLogger(opts.config.LogLevel, opts.config.LogFormat) | ||
| log, err := logger.NewZapLogger(logger.DebugLevel, logger.FormatJSON) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if err := opts.validate(); err != nil { | ||
| return err | ||
| } | ||
| db := dbus.New() | ||
| return bootstrap.Bootstrap(cmd.Context(), log, db) | ||
| }, | ||
| } | ||
|
|
||
| cmd.AddCommand(bootstrapCmd) | ||
| flags := cmd.Flags() | ||
| verflag.AddFlags(flags) | ||
| opts.addFlags(flags) | ||
|
|
||
| return cmd | ||
| } | ||
|
|
||
| func run(ctx context.Context, log logr.Logger) error { | ||
| log.Info("Feature Gates", "featureGates", features.DefaultFeatureGate) | ||
|
|
||
| // This is like importing the automaxprocs package for its init func (it will in turn call maxprocs.Set). | ||
| // Here we pass a custom logger, so that the result of the library gets logged to the same logger we use for the | ||
| // component itself. | ||
| if _, err := maxprocs.Set(maxprocs.Logger(func(s string, i ...interface{}) { | ||
| log.Info(fmt.Sprintf(s, i...)) //nolint:logcheck | ||
| })); err != nil { | ||
| log.Error(err, "Failed to set GOMAXPROCS") | ||
| } | ||
|
|
||
| // Check if token is present, else use bootstrap token to fetch token | ||
| config, err := common.ReadNodeAgentConfiguration(afero.NewOsFs()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if _, err := os.Stat(nodeagentv1alpha1.NodeAgentTokenFilePath); err != nil { | ||
| if !os.IsNotExist(err) { | ||
| return fmt.Errorf("unable to read token %w", err) | ||
| } | ||
|
|
||
| log.Info("Token not present, fetching from token from API server") | ||
|
|
||
| // Fetch token with bootstrap token and store it on disk | ||
| restConfig := &rest.Config{ | ||
| Host: config.APIServer.URL, | ||
| BearerToken: config.APIServer.BootstrapToken, | ||
| TLSClientConfig: rest.TLSClientConfig{ | ||
| CAData: []byte(config.APIServer.CA), | ||
| }, | ||
| } | ||
|
|
||
| // TODO(majst01): Remove this after v1.76 has been released. | ||
| if _, err := os.Stat(downloader.PathCredentialsToken); err == nil { | ||
| restConfig = &rest.Config{ | ||
| Host: config.APIServer.URL, | ||
| BearerTokenFile: downloader.PathCredentialsToken, | ||
| TLSClientConfig: rest.TLSClientConfig{ | ||
| CAData: []byte(config.APIServer.CA), | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| c, err := client.New(restConfig, client.Options{}) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create runtime client: %w", err) | ||
| } | ||
|
|
||
| tokenSecret := &corev1.Secret{} | ||
| if err := c.Get(ctx, client.ObjectKey{Namespace: metav1.NamespaceSystem, Name: nodeagentv1alpha1.NodeAgentTokenSecretName}, tokenSecret); err != nil { | ||
| return fmt.Errorf("unable to fetch token from API server: %w", err) | ||
| } | ||
|
|
||
| if len(tokenSecret.Data[nodeagentv1alpha1.NodeAgentTokenSecretKey]) == 0 { | ||
| return fmt.Errorf("secret does not contain a %s key", nodeagentv1alpha1.NodeAgentTokenSecretKey) | ||
| } | ||
|
|
||
| log.Info("Token fetched from API server, writing it to disk") | ||
| if err := os.WriteFile(nodeagentv1alpha1.NodeAgentTokenFilePath, tokenSecret.Data[nodeagentv1alpha1.NodeAgentTokenSecretKey], 0600); err != nil { | ||
| return fmt.Errorf("unable to write token to %s: %w", nodeagentv1alpha1.NodeAgentTokenFilePath, err) | ||
| } | ||
|
|
||
| log.Info("token written to disk") | ||
| } | ||
|
|
||
| if err := writeBootstrapKubeconfigToDisk(config); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log.Info("Token found, getting rest config") | ||
| restConfig := &rest.Config{ | ||
| Host: config.APIServer.URL, | ||
| BearerTokenFile: nodeagentv1alpha1.NodeAgentTokenFilePath, | ||
| TLSClientConfig: rest.TLSClientConfig{ | ||
| CAData: []byte(config.APIServer.CA), | ||
| }, | ||
| } | ||
|
|
||
| log.Info("Setting up manager") | ||
| mgr, err := manager.New(restConfig, manager.Options{ | ||
| Logger: log, | ||
| Scheme: kubernetes.ShootScheme, | ||
| GracefulShutdownTimeout: pointer.Duration(5 * time.Second), | ||
|
|
||
| // TODO: refine cache selector to allow only access to needed secrets instead | ||
| Namespace: metav1.NamespaceSystem, | ||
|
|
||
| LeaderElection: false, | ||
| Controller: controllerconfigv1alpha1.ControllerConfigurationSpec{ | ||
| RecoverPanic: pointer.Bool(true), | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // TODO: Make debugging configurable | ||
| // if cfg.Debugging != nil && cfg.Debugging.EnableProfiling { | ||
| // if err := (routes.Profiling{}).AddToManager(mgr); err != nil { | ||
| // return fmt.Errorf("failed adding profiling handlers to manager: %w", err) | ||
| // } | ||
| // if cfg.Debugging.EnableContentionProfiling { | ||
| // goruntime.SetBlockProfileRate(1) | ||
| // } | ||
| // } | ||
|
|
||
| log.Info("Setting up health check endpoints") | ||
| if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil { | ||
| return err | ||
| } | ||
| if err := mgr.AddReadyzCheck("informer-sync", gardenerhealthz.NewCacheSyncHealthz(mgr.GetCache())); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log.Info("Adding controllers to manager") | ||
| if err := controller.AddToManager(mgr); err != nil { | ||
| return fmt.Errorf("failed adding controllers to manager: %w", err) | ||
| } | ||
|
|
||
| log.Info("Starting manager") | ||
| return mgr.Start(ctx) | ||
| } | ||
|
|
||
| func writeBootstrapKubeconfigToDisk(config *nodeagentv1alpha1.NodeAgentConfiguration) error { | ||
| if _, err := os.Stat(kubelet.PathKubeconfigBootstrap); err == nil { | ||
| return nil | ||
| } | ||
|
|
||
| kubeconfig := &clientcmdv1.Config{ | ||
| Kind: "Config", | ||
| APIVersion: "v1", | ||
| Clusters: []clientcmdv1.NamedCluster{{ | ||
| Name: "default", | ||
| Cluster: clientcmdv1.Cluster{ | ||
| Server: config.APIServer.URL, | ||
| CertificateAuthorityData: []byte(config.APIServer.CA), | ||
| }, | ||
| }}, | ||
| CurrentContext: "kubelet-bootstrap@default", | ||
| Contexts: []clientcmdv1.NamedContext{{ | ||
| Name: "kubelet-bootstrap@default", | ||
| Context: clientcmdv1.Context{ | ||
| Cluster: "default", | ||
| AuthInfo: "kubelet-bootstrap", | ||
| }, | ||
| }}, | ||
| AuthInfos: []clientcmdv1.NamedAuthInfo{{ | ||
| Name: "kubelet-bootstrap", | ||
| AuthInfo: clientcmdv1.AuthInfo{ | ||
| Token: config.APIServer.BootstrapToken, | ||
| ImpersonateUserExtra: make(map[string][]string), | ||
| }, | ||
| }}, | ||
| } | ||
|
|
||
| raw, err := runtime.Encode(configlatest.Codec, kubeconfig) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to encode kubeconfig: %w", err) | ||
| } | ||
|
|
||
| if err := os.MkdirAll(filepath.Dir(kubelet.PathKubeconfigBootstrap), fs.ModeDir); err != nil { | ||
| return fmt.Errorf("unable to create kubelet kubeconfig directory: %w", err) | ||
| } | ||
|
|
||
| return os.WriteFile(kubelet.PathKubeconfigBootstrap, raw, 0600) | ||
| } |
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