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[operator] Introduce
gardenerapiserver Golang component (gardener#8215
) * Make `kubeapiserver` values and structs reusable * Add `gardenerapiserver` component boilerplate * ------------ empty separator commit ------------- * Generate server certificate secret ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/secret-cert.yaml * Generate etcd encryption config Code from `kubeapiserver` component was made reusable Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/secret-encryption-config.yaml * Generate access secret for virtual garden cluster Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/secret-kubeconfig.yaml * Generate audit webhook secret Code from `kubeapiserver` component was made reusable Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/secret-audit-webhook-config.yaml * Generate admission kubeconfig secrets Code from `kubeapiserver` component was made reusable Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/secret-admission-kubeconfig.yaml * Generate audit policy ConfigMap Code from `kubeapiserver` component was made reusable Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/configmap-audit-policy.yaml * Generate admission configs ConfigMaps Code from `kubeapiserver` component was made reusable Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/configmap-admission-config.yaml * ------------ empty separator commit ------------- * Generate `PodDisruptionBudget` Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/poddisruptionbudget.yaml * Generate `Service` Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/service.yaml The `.spec.clusterIP` is not needed since we will read the assigned ClusterIP later when needed. * Generate VPA Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/vpa.yaml * Generate HVPA Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/hvpa.yaml * Generate `Deployment` Code from `kubeapiserver` component was made reusable Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/runtime/templates/apiserver/deployment.yaml * ------------ empty separator commit ------------- * Generate `APIService`s Ref - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/apiservice-v1beta1-core-gardener-cloud.yaml - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/apiservice-v1alpha1-settings-gardener-cloud.yaml - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/apiservice-v1alpha1-seedmanagement-gardener-cloud.yaml - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/apiservice-v1alpha1-operations-gardener-cloud.yaml * Generate `Service` and `Endpoints` Ref https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/service-apiserver.yaml * Generate RBAC resources Ref: - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrole-apiserver.yaml - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrolebinding-apiserver.yaml - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrolebinding-apiserver-auth-delegator.yaml - https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/rolebinding-apiserver-auth-reader.yaml * Address PR review feedback * Address PR review feedback * Address PR review feedback * Address PR review feedback
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| Original file line number | Diff line number | Diff line change |
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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 apiserver | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| appsv1 "k8s.io/api/apps/v1" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/runtime/schema" | ||
| "k8s.io/apimachinery/pkg/runtime/serializer" | ||
| "k8s.io/apimachinery/pkg/runtime/serializer/json" | ||
| utilruntime "k8s.io/apimachinery/pkg/util/runtime" | ||
| webhookadmissionv1 "k8s.io/apiserver/pkg/admission/plugin/webhook/config/apis/webhookadmission/v1" | ||
| webhookadmissionv1alpha1 "k8s.io/apiserver/pkg/admission/plugin/webhook/config/apis/webhookadmission/v1alpha1" | ||
| apiserverv1alpha1 "k8s.io/apiserver/pkg/apis/apiserver/v1alpha1" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/yaml" | ||
|
|
||
| kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes" | ||
| ) | ||
|
|
||
| var admissionCodec runtime.Codec | ||
|
|
||
| func init() { | ||
| admissionScheme := runtime.NewScheme() | ||
| utilruntime.Must(apiserverv1alpha1.AddToScheme(admissionScheme)) | ||
| utilruntime.Must(webhookadmissionv1.AddToScheme(admissionScheme)) | ||
| utilruntime.Must(webhookadmissionv1alpha1.AddToScheme(admissionScheme)) | ||
|
|
||
| var ( | ||
| ser = json.NewSerializerWithOptions(json.DefaultMetaFactory, admissionScheme, admissionScheme, json.SerializerOptions{ | ||
| Yaml: true, | ||
| Pretty: false, | ||
| Strict: false, | ||
| }) | ||
| versions = schema.GroupVersions([]schema.GroupVersion{ | ||
| apiserverv1alpha1.SchemeGroupVersion, | ||
| webhookadmissionv1.SchemeGroupVersion, | ||
| webhookadmissionv1alpha1.SchemeGroupVersion, | ||
| }) | ||
| ) | ||
|
|
||
| admissionCodec = serializer.NewCodecFactory(admissionScheme).CodecForVersions(ser, ser, versions, versions) | ||
| } | ||
|
|
||
| const ( | ||
| configMapAdmissionDataKey = "admission-configuration.yaml" | ||
|
|
||
| volumeNameAdmissionConfiguration = "admission-config" | ||
| volumeNameAdmissionKubeconfigSecrets = "admission-kubeconfigs" | ||
| volumeMountPathAdmissionConfiguration = "/etc/kubernetes/admission" | ||
| volumeMountPathAdmissionKubeconfigSecrets = "/etc/kubernetes/admission-kubeconfigs" | ||
| ) | ||
|
|
||
| // ReconcileSecretAdmissionKubeconfigs reconciles the secret containing the kubeconfig for admission plugins. | ||
| func ReconcileSecretAdmissionKubeconfigs(ctx context.Context, c client.Client, secret *corev1.Secret, values Values) error { | ||
| secret.Data = make(map[string][]byte) | ||
|
|
||
| for _, plugin := range values.EnabledAdmissionPlugins { | ||
| if len(plugin.Kubeconfig) != 0 { | ||
| secret.Data[admissionPluginsKubeconfigFilename(plugin.Name)] = plugin.Kubeconfig | ||
| } | ||
| } | ||
|
|
||
| utilruntime.Must(kubernetesutils.MakeUnique(secret)) | ||
| return client.IgnoreAlreadyExists(c.Create(ctx, secret)) | ||
| } | ||
|
|
||
| // ReconcileConfigMapAdmission reconciles the ConfigMap containing the configs for the admission plugins. | ||
| func ReconcileConfigMapAdmission(ctx context.Context, c client.Client, configMap *corev1.ConfigMap, values Values) error { | ||
| configMap.Data = map[string]string{} | ||
|
|
||
| admissionConfig := &apiserverv1alpha1.AdmissionConfiguration{} | ||
| for _, plugin := range values.EnabledAdmissionPlugins { | ||
| rawConfig, err := computeRelevantAdmissionPluginRawConfig(plugin) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if rawConfig != nil { | ||
| admissionConfig.Plugins = append(admissionConfig.Plugins, apiserverv1alpha1.AdmissionPluginConfiguration{ | ||
| Name: plugin.Name, | ||
| Path: volumeMountPathAdmissionConfiguration + "/" + admissionPluginsConfigFilename(plugin.Name), | ||
| }) | ||
|
|
||
| configMap.Data[admissionPluginsConfigFilename(plugin.Name)] = string(rawConfig) | ||
| } | ||
| } | ||
|
|
||
| data, err := runtime.Encode(admissionCodec, admissionConfig) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| configMap.Data[configMapAdmissionDataKey] = string(data) | ||
| utilruntime.Must(kubernetesutils.MakeUnique(configMap)) | ||
|
|
||
| return client.IgnoreAlreadyExists(c.Create(ctx, configMap)) | ||
| } | ||
|
|
||
| func computeRelevantAdmissionPluginRawConfig(plugin AdmissionPluginConfig) ([]byte, error) { | ||
| var ( | ||
| nothingToMutate = (plugin.Config == nil || plugin.Config.Raw == nil) && len(plugin.Kubeconfig) == 0 | ||
| mustDefaultConfig = (plugin.Config == nil || plugin.Config.Raw == nil) && len(plugin.Kubeconfig) > 0 | ||
| kubeconfigFilePath = volumeMountPathAdmissionKubeconfigSecrets + "/" + admissionPluginsKubeconfigFilename(plugin.Name) | ||
| ) | ||
|
|
||
| if len(plugin.Kubeconfig) == 0 { | ||
| // This makes sure that the path to the kubeconfig is overwritten if specified in case no kubeconfig was | ||
| // provided. It prevents that users can access arbitrary files in the kube-apiserver pods and disguise them as | ||
| // kubeconfigs for their admission plugin configs. | ||
| kubeconfigFilePath = "" | ||
| } | ||
|
|
||
| switch plugin.Name { | ||
| case "ValidatingAdmissionWebhook", "MutatingAdmissionWebhook": | ||
| if nothingToMutate { | ||
| return nil, nil | ||
| } | ||
|
|
||
| if mustDefaultConfig { | ||
| if plugin.Config == nil { | ||
| plugin.Config = &runtime.RawExtension{} | ||
| } | ||
| if len(plugin.Config.Raw) == 0 { | ||
| plugin.Config.Raw = []byte(fmt.Sprintf(`apiVersion: %s | ||
| kind: WebhookAdmissionConfiguration`, webhookadmissionv1.SchemeGroupVersion.String())) | ||
| } | ||
| } | ||
|
|
||
| configObj, err := runtime.Decode(admissionCodec, plugin.Config.Raw) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot decode config for admission plugin %s: %w", plugin.Name, err) | ||
| } | ||
|
|
||
| switch config := configObj.(type) { | ||
| case *webhookadmissionv1.WebhookAdmission: | ||
| config.KubeConfigFile = kubeconfigFilePath | ||
| return runtime.Encode(admissionCodec, config) | ||
| case *webhookadmissionv1alpha1.WebhookAdmission: | ||
| config.KubeConfigFile = kubeconfigFilePath | ||
| return runtime.Encode(admissionCodec, config) | ||
| default: | ||
| return nil, fmt.Errorf("expected apiserver.config.k8s.io/{v1alpha1.WebhookAdmission,v1.WebhookAdmissionConfiguration} in %s plugin configuration but got %T", plugin.Name, config) | ||
| } | ||
|
|
||
| case "ImagePolicyWebhook": | ||
| // The configuration for this admission plugin is not backed by the API machinery, hence we have to use | ||
| // regular marshalling. | ||
| if nothingToMutate { | ||
| return nil, nil | ||
| } | ||
|
|
||
| if mustDefaultConfig { | ||
| if plugin.Config == nil { | ||
| plugin.Config = &runtime.RawExtension{} | ||
| } | ||
| if len(plugin.Config.Raw) == 0 { | ||
| plugin.Config.Raw = []byte("imagePolicy: {}") | ||
| } | ||
| } | ||
|
|
||
| config := map[string]interface{}{} | ||
| if err := yaml.Unmarshal(plugin.Config.Raw, &config); err != nil { | ||
| return nil, fmt.Errorf("failed to unmarshal plugin configuration for %s: %w", plugin.Name, err) | ||
| } | ||
| if config["imagePolicy"] == nil { | ||
| return nil, fmt.Errorf(`expected "imagePolicy" key in configuration but it does not exist`) | ||
| } | ||
|
|
||
| config["imagePolicy"].(map[string]interface{})["kubeConfigFile"] = kubeconfigFilePath | ||
| return yaml.Marshal(config) | ||
|
|
||
| default: | ||
| // For all other plugins, we do not need to mutate anything, hence we only return the provided config if set. | ||
| if plugin.Config != nil && plugin.Config.Raw != nil { | ||
| return plugin.Config.Raw, nil | ||
| } | ||
| } | ||
|
|
||
| return nil, nil | ||
| } | ||
|
|
||
| func admissionPluginsConfigFilename(name string) string { | ||
| return strings.ToLower(name) + ".yaml" | ||
| } | ||
|
|
||
| func admissionPluginsKubeconfigFilename(name string) string { | ||
| return strings.ToLower(name) + "-kubeconfig.yaml" | ||
| } | ||
|
|
||
| // InjectAdmissionSettings injects the admission settings into `gardener-apiserver` and `kube-apiserver` deployments. | ||
| func InjectAdmissionSettings(deployment *appsv1.Deployment, configMapAdmissionConfigs *corev1.ConfigMap, secretAdmissionKubeconfigs *corev1.Secret, values Values) { | ||
| if len(values.EnabledAdmissionPlugins) > 0 { | ||
| deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, "--enable-admission-plugins="+strings.Join(admissionPluginNames(values), ",")) | ||
| } | ||
| if len(values.DisabledAdmissionPlugins) > 0 { | ||
| deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, "--disable-admission-plugins="+strings.Join(disabledAdmissionPluginNames(values), ",")) | ||
| } | ||
| deployment.Spec.Template.Spec.Containers[0].Args = append(deployment.Spec.Template.Spec.Containers[0].Args, fmt.Sprintf("--admission-control-config-file=%s/%s", volumeMountPathAdmissionConfiguration, configMapAdmissionDataKey)) | ||
|
|
||
| deployment.Spec.Template.Spec.Containers[0].VolumeMounts = append(deployment.Spec.Template.Spec.Containers[0].VolumeMounts, | ||
| corev1.VolumeMount{ | ||
| Name: volumeNameAdmissionConfiguration, | ||
| MountPath: volumeMountPathAdmissionConfiguration, | ||
| }, | ||
| corev1.VolumeMount{ | ||
| Name: volumeNameAdmissionKubeconfigSecrets, | ||
| MountPath: volumeMountPathAdmissionKubeconfigSecrets, | ||
| }, | ||
| ) | ||
|
|
||
| deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, | ||
| corev1.Volume{ | ||
| Name: volumeNameAdmissionConfiguration, | ||
| VolumeSource: corev1.VolumeSource{ | ||
| ConfigMap: &corev1.ConfigMapVolumeSource{ | ||
| LocalObjectReference: corev1.LocalObjectReference{ | ||
| Name: configMapAdmissionConfigs.Name, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| corev1.Volume{ | ||
| Name: volumeNameAdmissionKubeconfigSecrets, | ||
| VolumeSource: corev1.VolumeSource{ | ||
| Secret: &corev1.SecretVolumeSource{ | ||
| SecretName: secretAdmissionKubeconfigs.Name, | ||
| }, | ||
| }, | ||
| }, | ||
| ) | ||
| } | ||
|
|
||
| func admissionPluginNames(values Values) []string { | ||
| var out []string | ||
|
|
||
| for _, plugin := range values.EnabledAdmissionPlugins { | ||
| out = append(out, plugin.Name) | ||
| } | ||
|
|
||
| return out | ||
| } | ||
|
|
||
| func disabledAdmissionPluginNames(values Values) []string { | ||
| var out []string | ||
|
|
||
| for _, plugin := range values.DisabledAdmissionPlugins { | ||
| out = append(out, plugin.Name) | ||
| } | ||
|
|
||
| return out | ||
| } |
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