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feat: run without kube-apiserver (#38)
## What type of PR is this? /kind feature ## What this PR does / why we need it: Make it possible for Karbour to run without relying on a kube-apiserver and remove the following startup parameters: * --kubeconfig * --authorization-kubeconfig * --authentication-kubeconfig
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| // Copyright The Karbour Authors. | ||
| // | ||
| // 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. | ||
|
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| package options | ||
|
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||
| import ( | ||
| "fmt" | ||
|
|
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| "github.com/spf13/pflag" | ||
|
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| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apiserver/pkg/admission" | ||
| "k8s.io/apiserver/pkg/features" | ||
| "k8s.io/apiserver/pkg/server" | ||
| "k8s.io/apiserver/pkg/server/options" | ||
| "k8s.io/apiserver/pkg/storage/storagebackend" | ||
| "k8s.io/apiserver/pkg/util/feature" | ||
| utilflowcontrol "k8s.io/apiserver/pkg/util/flowcontrol" | ||
| clientgoinformers "k8s.io/client-go/informers" | ||
| clientgoclientset "k8s.io/client-go/kubernetes" | ||
| "k8s.io/component-base/featuregate" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
|
|
||
| // RecommendedOptions contains the recommended options for running an API server. | ||
| // If you add something to this list, it should be in a logical grouping. | ||
| // Each of them can be nil to leave the feature unconfigured on ApplyTo. | ||
| type RecommendedOptions struct { | ||
| ServerRun *options.ServerRunOptions | ||
| Etcd *options.EtcdOptions | ||
| SecureServing *options.SecureServingOptionsWithLoopback | ||
| Audit *options.AuditOptions | ||
| Features *options.FeatureOptions | ||
|
|
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| // FeatureGate is a way to plumb feature gate through if you have them. | ||
| FeatureGate featuregate.FeatureGate | ||
| // ExtraAdmissionInitializers is called once after all ApplyTo from the options above, to pass the returned | ||
| // admission plugin initializers to Admission.ApplyTo. | ||
| ExtraAdmissionInitializers func(c *server.RecommendedConfig) ([]admission.PluginInitializer, error) | ||
| Admission *options.AdmissionOptions | ||
| // API Server Egress Selector is used to control outbound traffic from the API Server | ||
| EgressSelector *options.EgressSelectorOptions | ||
| // Traces contains options to control distributed request tracing. | ||
| Traces *options.TracingOptions | ||
| } | ||
|
|
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| func NewRecommendedOptions(prefix string, codec runtime.Codec) *RecommendedOptions { | ||
| sso := options.NewSecureServingOptions() | ||
| sso.HTTP2MaxStreamsPerConnection = 1000 | ||
|
|
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| return &RecommendedOptions{ | ||
| ServerRun: options.NewServerRunOptions(), | ||
| Etcd: options.NewEtcdOptions(storagebackend.NewDefaultConfig(prefix, codec)), | ||
| SecureServing: sso.WithLoopback(), | ||
| Audit: options.NewAuditOptions(), | ||
| Features: options.NewFeatureOptions(), | ||
| FeatureGate: feature.DefaultFeatureGate, | ||
| ExtraAdmissionInitializers: func(c *server.RecommendedConfig) ([]admission.PluginInitializer, error) { return nil, nil }, | ||
| Admission: options.NewAdmissionOptions(), | ||
| EgressSelector: options.NewEgressSelectorOptions(), | ||
| Traces: options.NewTracingOptions(), | ||
| } | ||
| } | ||
|
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| func (o *RecommendedOptions) AddFlags(fs *pflag.FlagSet) { | ||
| o.ServerRun.AddUniversalFlags(fs) | ||
| o.Etcd.AddFlags(fs) | ||
| o.SecureServing.AddFlags(fs) | ||
| o.Audit.AddFlags(fs) | ||
| o.Features.AddFlags(fs) | ||
| o.Admission.AddFlags(fs) | ||
| o.EgressSelector.AddFlags(fs) | ||
| o.Traces.AddFlags(fs) | ||
| } | ||
|
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| // ApplyTo adds RecommendedOptions to the server configuration. | ||
| // pluginInitializers can be empty, it is only need for additional initializers. | ||
| func (o *RecommendedOptions) ApplyTo(config *server.RecommendedConfig) error { | ||
| if err := o.ServerRun.ApplyTo(&config.Config); err != nil { | ||
| return err | ||
| } | ||
|
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| if err := o.Etcd.Complete(config.Config.StorageObjectCountTracker, config.Config.DrainedNotify(), config.Config.AddPostStartHook); err != nil { | ||
| return err | ||
| } | ||
| if err := o.Etcd.ApplyTo(&config.Config); err != nil { | ||
| return err | ||
| } | ||
| if err := o.EgressSelector.ApplyTo(&config.Config); err != nil { | ||
| return err | ||
| } | ||
| if err := o.Traces.ApplyTo(config.Config.EgressSelector, &config.Config); err != nil { | ||
| return err | ||
| } | ||
| if err := o.SecureServing.ApplyTo(&config.Config.SecureServing, &config.Config.LoopbackClientConfig); err != nil { | ||
| return err | ||
| } | ||
| if err := o.Audit.ApplyTo(&config.Config); err != nil { | ||
| return err | ||
| } | ||
| if err := o.Features.ApplyTo(&config.Config); err != nil { | ||
| return err | ||
| } | ||
|
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| kubeClientConfig := config.LoopbackClientConfig | ||
| client, err := clientgoclientset.NewForConfig(kubeClientConfig) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| config.ClientConfig = kubeClientConfig | ||
| config.SharedInformerFactory = clientgoinformers.NewSharedInformerFactory(client, kubeClientConfig.Timeout) | ||
|
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| if initializers, err := o.ExtraAdmissionInitializers(config); err != nil { | ||
| return err | ||
| } else if err := o.Admission.ApplyTo(&config.Config, config.SharedInformerFactory, config.ClientConfig, o.FeatureGate, initializers...); err != nil { | ||
| return err | ||
| } | ||
| if feature.DefaultFeatureGate.Enabled(features.APIPriorityAndFairness) { | ||
| if config.ClientConfig != nil { | ||
| if config.MaxRequestsInFlight+config.MaxMutatingRequestsInFlight <= 0 { | ||
| return fmt.Errorf("invalid configuration: MaxRequestsInFlight=%d and MaxMutatingRequestsInFlight=%d; they must add up to something positive", config.MaxRequestsInFlight, config.MaxMutatingRequestsInFlight) | ||
| } | ||
| config.FlowControl = utilflowcontrol.New( | ||
| config.SharedInformerFactory, | ||
| clientgoclientset.NewForConfigOrDie(config.ClientConfig).FlowcontrolV1beta3(), | ||
| config.MaxRequestsInFlight+config.MaxMutatingRequestsInFlight, | ||
| config.RequestTimeout/4, | ||
| ) | ||
| } else { | ||
| klog.Warningf("Neither kubeconfig is provided nor service-account is mounted, so APIPriorityAndFairness will be disabled") | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (o *RecommendedOptions) Validate() []error { | ||
| errors := []error{} | ||
| errors = append(errors, o.ServerRun.Validate()...) | ||
| errors = append(errors, o.Etcd.Validate()...) | ||
| errors = append(errors, o.SecureServing.Validate()...) | ||
| errors = append(errors, o.Audit.Validate()...) | ||
| errors = append(errors, o.Features.Validate()...) | ||
| errors = append(errors, o.Admission.Validate()...) | ||
| errors = append(errors, o.EgressSelector.Validate()...) | ||
| errors = append(errors, o.Traces.Validate()...) | ||
|
|
||
| return errors | ||
| } |
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