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[node-agent] Introduce
cmd/gardener-node-agent/app.go with `manager…
….Manager` initialization (gardener#8627) * Add `Server` configuration to `node-agent` config API * Introduce `main()` function for `gardener-node-agent` If it will be started with a kubeconfig pointing to the well-known location of the bootstrap token file, it will use it to fetch the access token and write it to the disk. Afterwards, it will overwrite the kubeconfig to point to the access token file instead of the bootstrap token file. The rest config will be modified ad-hoc, hence, the bootstrap token will only be used for fetching the "real" access token. * Drop validation regarding kubeconfig Otherwise, it's not possible to specify the kubeconfig via the `KUBECONFIG` environment variable * Add GNA to `Dockerfile` and `Makefile` * Address PR review feedback
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,226 @@ | ||
| // 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" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
| goruntime "runtime" | ||
| "strconv" | ||
| "time" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/pflag" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/client-go/rest" | ||
| clientcmdlatest "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/cache" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| controllerconfig "sigs.k8s.io/controller-runtime/pkg/config" | ||
| "sigs.k8s.io/controller-runtime/pkg/healthz" | ||
| logf "sigs.k8s.io/controller-runtime/pkg/log" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager" | ||
| metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server" | ||
|
|
||
| resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1" | ||
| "github.com/gardener/gardener/pkg/client/kubernetes" | ||
| "github.com/gardener/gardener/pkg/controllerutils/routes" | ||
| "github.com/gardener/gardener/pkg/features" | ||
| gardenerhealthz "github.com/gardener/gardener/pkg/healthz" | ||
| "github.com/gardener/gardener/pkg/logger" | ||
| "github.com/gardener/gardener/pkg/nodeagent/apis/config" | ||
| nodeagentv1alpha1 "github.com/gardener/gardener/pkg/nodeagent/apis/config/v1alpha1" | ||
| "github.com/gardener/gardener/pkg/nodeagent/controller" | ||
| kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes" | ||
| ) | ||
|
|
||
| // 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() | ||
|
|
||
| if err := opts.complete(); err != nil { | ||
| return err | ||
| } | ||
| if err := opts.validate(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log, err := logger.NewZapLogger(opts.config.LogLevel, opts.config.LogFormat) | ||
| if err != nil { | ||
| return fmt.Errorf("error instantiating zap logger: %w", err) | ||
| } | ||
|
|
||
| logf.SetLogger(log) | ||
| klog.SetLogger(log) | ||
|
|
||
| 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, opts.config) | ||
| }, | ||
| } | ||
|
|
||
| flags := cmd.Flags() | ||
| verflag.AddFlags(flags) | ||
| opts.addFlags(flags) | ||
|
|
||
| return cmd | ||
| } | ||
|
|
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| func run(ctx context.Context, log logr.Logger, cfg *config.NodeAgentConfiguration) error { | ||
| log.Info("Feature Gates", "featureGates", features.DefaultFeatureGate) | ||
|
|
||
| log.Info("Getting rest config") | ||
| if kubeconfig := os.Getenv("KUBECONFIG"); kubeconfig != "" { | ||
| cfg.ClientConnection.Kubeconfig = kubeconfig | ||
| } | ||
| if cfg.ClientConnection.Kubeconfig == "" { | ||
| return fmt.Errorf("must specify path to a kubeconfig (either via \"KUBECONFIG\" environment variable of via .clientConnection.kubeconfig in component config)") | ||
| } | ||
|
|
||
| restConfig, err := kubernetes.RESTConfigFromClientConnectionConfiguration(&cfg.ClientConnection, nil, kubernetes.AuthTokenFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if restConfig.BearerTokenFile == nodeagentv1alpha1.BootstrapTokenFilePath { | ||
| log.Info("Kubeconfig points to the bootstrap token file") | ||
| if err := fetchAccessTokenViaBootstrapToken(ctx, log, restConfig, cfg); err != nil { | ||
| return fmt.Errorf("failed fetching access token via bootstrap token: %w", err) | ||
| } | ||
| } | ||
|
|
||
| var extraHandlers map[string]http.Handler | ||
| if cfg.Debugging != nil && cfg.Debugging.EnableProfiling { | ||
| extraHandlers = routes.ProfilingHandlers | ||
| if cfg.Debugging.EnableContentionProfiling { | ||
| goruntime.SetBlockProfileRate(1) | ||
| } | ||
| } | ||
|
|
||
| log.Info("Setting up manager") | ||
| mgr, err := manager.New(restConfig, manager.Options{ | ||
| Logger: log, | ||
| Scheme: kubernetes.SeedScheme, | ||
| GracefulShutdownTimeout: pointer.Duration(5 * time.Second), | ||
|
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||
| HealthProbeBindAddress: net.JoinHostPort(cfg.Server.HealthProbes.BindAddress, strconv.Itoa(cfg.Server.HealthProbes.Port)), | ||
| Metrics: metricsserver.Options{ | ||
| BindAddress: net.JoinHostPort(cfg.Server.Metrics.BindAddress, strconv.Itoa(cfg.Server.Metrics.Port)), | ||
| ExtraHandlers: extraHandlers, | ||
| }, | ||
|
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||
| Cache: cache.Options{ | ||
| ByObject: map[client.Object]cache.ByObject{ | ||
| &corev1.Secret{}: { | ||
| Namespaces: map[string]cache.Config{metav1.NamespaceSystem: {}}, | ||
| }, | ||
| }, | ||
| }, | ||
| LeaderElection: false, | ||
| Controller: controllerconfig.Controller{ | ||
| RecoverPanic: pointer.Bool(true), | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| 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, cfg); err != nil { | ||
| return fmt.Errorf("failed adding controllers to manager: %w", err) | ||
| } | ||
|
|
||
| log.Info("Starting manager") | ||
| return mgr.Start(ctx) | ||
| } | ||
|
|
||
| func fetchAccessTokenViaBootstrapToken(ctx context.Context, log logr.Logger, restConfig *rest.Config, cfg *config.NodeAgentConfiguration) error { | ||
| c, err := client.New(restConfig, client.Options{}) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create client with bootstrap token: %w", err) | ||
| } | ||
|
|
||
| secret := &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: cfg.AccessTokenSecretName, Namespace: metav1.NamespaceSystem}} | ||
| log.Info("Fetching access token secret", "secret", client.ObjectKeyFromObject(secret)) | ||
| if err := c.Get(ctx, client.ObjectKeyFromObject(secret), secret); err != nil { | ||
| return fmt.Errorf("failed fetching access token from API server: %w", err) | ||
| } | ||
|
|
||
| token := secret.Data[resourcesv1alpha1.DataKeyToken] | ||
| if len(token) == 0 { | ||
| return fmt.Errorf("secret key %q does not exist or empty", resourcesv1alpha1.DataKeyToken) | ||
| } | ||
|
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| restConfig.BearerTokenFile = nodeagentv1alpha1.TokenFilePath | ||
| kubeconfigRaw, err := runtime.Encode(clientcmdlatest.Codec, kubernetesutils.NewKubeconfig( | ||
| Name, | ||
| clientcmdv1.Cluster{Server: restConfig.Host, CertificateAuthorityData: restConfig.CAData}, | ||
| clientcmdv1.AuthInfo{TokenFile: nodeagentv1alpha1.TokenFilePath}, | ||
| )) | ||
| if err != nil { | ||
| return fmt.Errorf("failed encoding kubeconfig: %w", err) | ||
| } | ||
|
|
||
| log.Info("Writing downloaded access token to disk", "path", nodeagentv1alpha1.TokenFilePath) | ||
| if err := os.WriteFile(nodeagentv1alpha1.TokenFilePath, token, 0600); err != nil { | ||
| return fmt.Errorf("unable to write access token to %s: %w", nodeagentv1alpha1.TokenFilePath, err) | ||
| } | ||
| log.Info("Token written to disk") | ||
|
|
||
| log.Info("Overwriting kubeconfig on disk to no longer use bootstrap token file", "path", cfg.ClientConnection.Kubeconfig) | ||
| if err := os.WriteFile(cfg.ClientConnection.Kubeconfig, kubeconfigRaw, 0600); err != nil { | ||
| return fmt.Errorf("unable to write kubeconfig to %s: %w", cfg.ClientConnection.Kubeconfig, err) | ||
| } | ||
| log.Info("Kubeconfig written to disk") | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| // 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 ( | ||
| "fmt" | ||
| "os" | ||
|
|
||
| "github.com/spf13/pflag" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/runtime/serializer" | ||
| utilruntime "k8s.io/apimachinery/pkg/util/runtime" | ||
|
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||
| "github.com/gardener/gardener/pkg/features" | ||
| "github.com/gardener/gardener/pkg/nodeagent/apis/config" | ||
| nodeagentv1alpha1 "github.com/gardener/gardener/pkg/nodeagent/apis/config/v1alpha1" | ||
| nodeagentvalidation "github.com/gardener/gardener/pkg/nodeagent/apis/config/validation" | ||
| ) | ||
|
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| var configDecoder runtime.Decoder | ||
|
|
||
| func init() { | ||
| configScheme := runtime.NewScheme() | ||
| schemeBuilder := runtime.NewSchemeBuilder( | ||
| config.AddToScheme, | ||
| nodeagentv1alpha1.AddToScheme, | ||
| ) | ||
| utilruntime.Must(schemeBuilder.AddToScheme(configScheme)) | ||
| configDecoder = serializer.NewCodecFactory(configScheme).UniversalDecoder() | ||
| } | ||
|
|
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| type options struct { | ||
| configFile string | ||
| config *config.NodeAgentConfiguration | ||
| } | ||
|
|
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| func (o *options) addFlags(fs *pflag.FlagSet) { | ||
| fs.StringVar(&o.configFile, "config", o.configFile, "Path to configuration file.") | ||
| } | ||
|
|
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| func (o *options) complete() error { | ||
| if len(o.configFile) == 0 { | ||
| return fmt.Errorf("missing config file") | ||
| } | ||
|
|
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| data, err := os.ReadFile(o.configFile) | ||
| if err != nil { | ||
| return fmt.Errorf("error reading config file: %w", err) | ||
| } | ||
|
|
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| o.config = &config.NodeAgentConfiguration{} | ||
| if err = runtime.DecodeInto(configDecoder, data, o.config); err != nil { | ||
| return fmt.Errorf("error decoding config: %w", err) | ||
| } | ||
|
|
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| // Set feature gates immediately after decoding the config. | ||
| // Feature gates might influence the next steps, e.g., validating the config. | ||
| return features.DefaultFeatureGate.SetFromMap(o.config.FeatureGates) | ||
| } | ||
|
|
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| func (o *options) validate() error { | ||
| if errs := nodeagentvalidation.ValidateNodeAgentConfiguration(o.config); len(errs) > 0 { | ||
| return errs.ToAggregate() | ||
| } | ||
| return nil | ||
| } |
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| @@ -0,0 +1,36 @@ | ||
| // 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 main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
|
|
||
| "sigs.k8s.io/controller-runtime/pkg/manager/signals" | ||
|
|
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| "github.com/gardener/gardener/cmd/gardener-node-agent/app" | ||
| "github.com/gardener/gardener/cmd/utils" | ||
| "github.com/gardener/gardener/pkg/nodeagent/features" | ||
| ) | ||
|
|
||
| func main() { | ||
| utils.DeduplicateWarnings() | ||
| features.RegisterFeatureGates() | ||
|
|
||
| if err := app.NewCommand().ExecuteContext(signals.SetupSignalHandler()); err != nil { | ||
| fmt.Println(err) | ||
| os.Exit(1) | ||
| } | ||
| } |
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