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chore: migrate webhooks (kubernetes-sigs#16)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| /* | ||
| 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 webhooks | ||
|
|
||
| import ( | ||
| "context" | ||
| "flag" | ||
| "fmt" | ||
| "runtime/debug" | ||
|
|
||
| "k8s.io/client-go/kubernetes" | ||
| "knative.dev/pkg/configmap" | ||
| "knative.dev/pkg/configmap/informer" | ||
| "knative.dev/pkg/controller" | ||
| knativeinjection "knative.dev/pkg/injection" | ||
| "knative.dev/pkg/injection/sharedmain" | ||
| "knative.dev/pkg/logging" | ||
| "knative.dev/pkg/system" | ||
| "knative.dev/pkg/webhook" | ||
| "knative.dev/pkg/webhook/certificates" | ||
| "knative.dev/pkg/webhook/configmaps" | ||
| "knative.dev/pkg/webhook/resourcesemantics/defaulting" | ||
| "knative.dev/pkg/webhook/resourcesemantics/validation" | ||
|
|
||
| "github.com/aws/karpenter-core/pkg/apis" | ||
| "github.com/aws/karpenter-core/pkg/cloudprovider" | ||
| "github.com/aws/karpenter-core/pkg/operator/injection" | ||
| "github.com/aws/karpenter-core/pkg/utils/env" | ||
| ) | ||
|
|
||
| type WebhookOpts struct { | ||
| KarpenterService string | ||
| WebhookPort int | ||
| MemoryLimit int64 | ||
| } | ||
|
|
||
| var ( | ||
| component = "webhook" | ||
| opts = WebhookOpts{} | ||
| ) | ||
|
|
||
| func init() { | ||
| flag.StringVar(&opts.KarpenterService, "karpenter-service", env.WithDefaultString("KARPENTER_SERVICE", ""), "The Karpenter Service name for the dynamic webhook certificate") | ||
| flag.IntVar(&opts.WebhookPort, "port", env.WithDefaultInt("PORT", 8443), "The port the webhook endpoint binds to for validation and mutation of resources") | ||
| flag.Int64Var(&opts.MemoryLimit, "memory-limit", env.WithDefaultInt64("MEMORY_LIMIT", -1), "Memory limit on the container running the webhook. The GC soft memory limit is set to 90% of this value.") | ||
| } | ||
|
|
||
| func Initialize(injectCloudProvider func(cloudprovider.Context) cloudprovider.CloudProvider) { | ||
| config := knativeinjection.ParseAndGetRESTConfigOrDie() | ||
|
|
||
| // Set up logger and watch for changes to log level | ||
| clientSet := kubernetes.NewForConfigOrDie(config) | ||
| cmw := informer.NewInformedWatcher(clientSet, system.Namespace()) | ||
| ctx := injection.LoggingContextOrDie(component, config, cmw) | ||
| ctx = knativeinjection.WithNamespaceScope(ctx, system.Namespace()) | ||
|
|
||
| ctx = webhook.WithOptions(ctx, webhook.Options{ | ||
| Port: opts.WebhookPort, | ||
| ServiceName: opts.KarpenterService, | ||
| SecretName: fmt.Sprintf("%s-cert", opts.KarpenterService), | ||
| }) | ||
| // TODO: This can be removed if we eventually decide that we need leader election. Having leader election has resulted in the webhook | ||
| // having issues described in https://github.com/aws/karpenter/issues/2562 so these issues need to be resolved if this line is removed | ||
| ctx = sharedmain.WithHADisabled(ctx) // Disable leader election for webhook | ||
|
|
||
| // Register the cloud provider to attach vendor specific validation logic. | ||
| // TODO(https://github.com/aws/karpenter/issues/2052) | ||
| injectCloudProvider(cloudprovider.Context{ | ||
| Context: ctx, | ||
| ClientSet: clientSet, | ||
| WebhookOnly: true, | ||
| }) | ||
|
|
||
| if opts.MemoryLimit > 0 { | ||
| newLimit := int64(float64(opts.MemoryLimit) * 0.9) | ||
| logging.FromContext(ctx).Infof("Setting GC memory limit to %d, container limit = %d", newLimit, opts.MemoryLimit) | ||
| debug.SetMemoryLimit(newLimit) | ||
| } | ||
|
|
||
| // Controllers and webhook | ||
| sharedmain.MainWithConfig(ctx, "webhook", config, | ||
| certificates.NewController, | ||
| newCRDDefaultingWebhook, | ||
| newCRDValidationWebhook, | ||
| newConfigValidationController, | ||
| ) | ||
| } | ||
|
|
||
| func newCRDDefaultingWebhook(ctx context.Context, w configmap.Watcher) *controller.Impl { | ||
| return defaulting.NewAdmissionController(ctx, | ||
| "defaulting.webhook.provisioners.karpenter.sh", | ||
| "/default-resource", | ||
| apis.Resources, | ||
| InjectContext, | ||
| true, | ||
| ) | ||
| } | ||
|
|
||
| func newCRDValidationWebhook(ctx context.Context, w configmap.Watcher) *controller.Impl { | ||
| return validation.NewAdmissionController(ctx, | ||
| "validation.webhook.provisioners.karpenter.sh", | ||
| "/validate-resource", | ||
| apis.Resources, | ||
| InjectContext, | ||
| true, | ||
| ) | ||
| } | ||
|
|
||
| func newConfigValidationController(ctx context.Context, cmw configmap.Watcher) *controller.Impl { | ||
| return configmaps.NewAdmissionController(ctx, | ||
| "validation.webhook.config.karpenter.sh", | ||
| "/config-validation", | ||
| configmap.Constructors{ | ||
| logging.ConfigMapName(): logging.NewConfigFromConfigMap, | ||
| }, | ||
| ) | ||
| } | ||
|
|
||
| func InjectContext(ctx context.Context) context.Context { | ||
| return ctx | ||
| } |