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start.go
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start.go
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// Copyright 2018 The Kubernetes 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.
package app
import (
"fmt"
"io"
"net"
"time"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
genericapiserver "k8s.io/apiserver/pkg/server"
"k8s.io/apiserver/pkg/server/healthz"
genericoptions "k8s.io/apiserver/pkg/server/options"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"github.com/kubernetes-incubator/metrics-server/pkg/apiserver"
genericmetrics "github.com/kubernetes-incubator/metrics-server/pkg/apiserver/generic"
"github.com/kubernetes-incubator/metrics-server/pkg/manager"
"github.com/kubernetes-incubator/metrics-server/pkg/provider/sink"
"github.com/kubernetes-incubator/metrics-server/pkg/sources"
"github.com/kubernetes-incubator/metrics-server/pkg/sources/summary"
)
// NewCommandStartMetricsServer provides a CLI handler for the metrics server entrypoint
func NewCommandStartMetricsServer(out, errOut io.Writer, stopCh <-chan struct{}) *cobra.Command {
o := NewMetricsServerOptions()
cmd := &cobra.Command{
Short: "Launch metrics-server",
Long: "Launch metrics-server",
RunE: func(c *cobra.Command, args []string) error {
if err := o.Run(stopCh); err != nil {
return err
}
return nil
},
}
flags := cmd.Flags()
flags.DurationVar(&o.MetricResolution, "metric-resolution", o.MetricResolution, "The resolution at which metrics-server will retain metrics.")
flags.BoolVar(&o.InsecureKubeletTLS, "kubelet-insecure-tls", o.InsecureKubeletTLS, "Do not verify CA of serving certificates presented by Kubelets. For testing purposes only.")
flags.BoolVar(&o.DeprecatedCompletelyInsecureKubelet, "deprecated-kubelet-completely-insecure", o.DeprecatedCompletelyInsecureKubelet, "Do not use any encryption, authorization, or authentication when communicating with the Kubelet.")
flags.IntVar(&o.KubeletPort, "kubelet-port", o.KubeletPort, "The port to use to connect to Kubelets.")
flags.StringVar(&o.Kubeconfig, "kubeconfig", o.Kubeconfig, "The path to the kubeconfig used to connect to the Kubernetes API server and the Kubelets (defaults to in-cluster config)")
flags.StringSliceVar(&o.KubeletPreferredAddressTypes, "kubelet-preferred-address-types", o.KubeletPreferredAddressTypes, "The priority of node address types to use when determining which address to use to connect to a particular node")
flags.StringVar(&o.KubeletCAFile, "kubelet-certificate-authority", "", "Path to the CA to use to validate the Kubelet's serving certificates.")
flags.MarkDeprecated("deprecated-kubelet-completely-insecure", "This is rarely the right option, since it leaves kubelet communication completely insecure. If you encounter auth errors, make sure you've enabled token webhook auth on the Kubelet, and if you're in a test cluster with self-signed Kubelet certificates, consider using kubelet-insecure-tls instead.")
o.SecureServing.AddFlags(flags)
o.Authentication.AddFlags(flags)
o.Authorization.AddFlags(flags)
o.Features.AddFlags(flags)
return cmd
}
type MetricsServerOptions struct {
// genericoptions.ReccomendedOptions - EtcdOptions
SecureServing *genericoptions.SecureServingOptionsWithLoopback
Authentication *genericoptions.DelegatingAuthenticationOptions
Authorization *genericoptions.DelegatingAuthorizationOptions
Features *genericoptions.FeatureOptions
Kubeconfig string
// Only to be used to for testing
DisableAuthForTesting bool
MetricResolution time.Duration
KubeletPort int
InsecureKubeletTLS bool
KubeletPreferredAddressTypes []string
KubeletCAFile string
DeprecatedCompletelyInsecureKubelet bool
}
// NewMetricsServerOptions constructs a new set of default options for metrics-server.
func NewMetricsServerOptions() *MetricsServerOptions {
o := &MetricsServerOptions{
SecureServing: genericoptions.NewSecureServingOptions().WithLoopback(),
Authentication: genericoptions.NewDelegatingAuthenticationOptions(),
Authorization: genericoptions.NewDelegatingAuthorizationOptions(),
Features: genericoptions.NewFeatureOptions(),
MetricResolution: 60 * time.Second,
KubeletPort: 10250,
KubeletPreferredAddressTypes: make([]string, len(summary.DefaultAddressTypePriority)),
}
for i, addrType := range summary.DefaultAddressTypePriority {
o.KubeletPreferredAddressTypes[i] = string(addrType)
}
return o
}
func (o MetricsServerOptions) Config() (*apiserver.Config, error) {
if err := o.SecureServing.MaybeDefaultWithSelfSignedCerts("localhost", nil, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
return nil, fmt.Errorf("error creating self-signed certificates: %v", err)
}
serverConfig := genericapiserver.NewConfig(genericmetrics.Codecs)
if err := o.SecureServing.ApplyTo(&serverConfig.SecureServing, &serverConfig.LoopbackClientConfig); err != nil {
return nil, err
}
if !o.DisableAuthForTesting {
if err := o.Authentication.ApplyTo(&serverConfig.Authentication, serverConfig.SecureServing, nil); err != nil {
return nil, err
}
if err := o.Authorization.ApplyTo(&serverConfig.Authorization); err != nil {
return nil, err
}
}
return &apiserver.Config{
GenericConfig: serverConfig,
ProviderConfig: genericmetrics.ProviderConfig{},
}, nil
}
func (o MetricsServerOptions) Run(stopCh <-chan struct{}) error {
// grab the config for the API server
config, err := o.Config()
if err != nil {
return err
}
config.GenericConfig.EnableMetrics = true
// set up the client config
var clientConfig *rest.Config
if len(o.Kubeconfig) > 0 {
loadingRules := &clientcmd.ClientConfigLoadingRules{ExplicitPath: o.Kubeconfig}
loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
clientConfig, err = loader.ClientConfig()
} else {
clientConfig, err = rest.InClusterConfig()
}
if err != nil {
return fmt.Errorf("unable to construct lister client config: %v", err)
}
// Use protobufs for communication with apiserver
clientConfig.ContentType = "application/vnd.kubernetes.protobuf"
// set up the informers
kubeClient, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
return fmt.Errorf("unable to construct lister client: %v", err)
}
// we should never need to resync, since we're not worried about missing events,
// and resync is actually for regular interval-based reconciliation these days,
// so set the default resync interval to 0
informerFactory := informers.NewSharedInformerFactory(kubeClient, 0)
// set up the source manager
kubeletRestCfg := rest.CopyConfig(clientConfig)
if len(o.KubeletCAFile) > 0 {
kubeletRestCfg.TLSClientConfig.CAFile = o.KubeletCAFile
kubeletRestCfg.TLSClientConfig.CAData = nil
}
kubeletConfig := summary.GetKubeletConfig(kubeletRestCfg, o.KubeletPort, o.InsecureKubeletTLS, o.DeprecatedCompletelyInsecureKubelet)
kubeletClient, err := summary.KubeletClientFor(kubeletConfig)
if err != nil {
return fmt.Errorf("unable to construct a client to connect to the kubelets: %v", err)
}
// set up an address resolver according to the user's priorities
addrPriority := make([]corev1.NodeAddressType, len(o.KubeletPreferredAddressTypes))
for i, addrType := range o.KubeletPreferredAddressTypes {
addrPriority[i] = corev1.NodeAddressType(addrType)
}
addrResolver := summary.NewPriorityNodeAddressResolver(addrPriority)
sourceProvider := summary.NewSummaryProvider(informerFactory.Core().V1().Nodes().Lister(), kubeletClient, addrResolver)
scrapeTimeout := time.Duration(float64(o.MetricResolution) * 0.90) // scrape timeout is 90% of the scrape interval
sources.RegisterDurationMetrics(scrapeTimeout)
sourceManager := sources.NewSourceManager(sourceProvider, scrapeTimeout)
// set up the in-memory sink and provider
metricSink, metricsProvider := sink.NewSinkProvider()
// set up the general manager
manager.RegisterDurationMetrics(o.MetricResolution)
mgr := manager.NewManager(sourceManager, metricSink, o.MetricResolution)
// inject the providers into the config
config.ProviderConfig.Node = metricsProvider
config.ProviderConfig.Pod = metricsProvider
// complete the config to get an API server
server, err := config.Complete(informerFactory).New()
if err != nil {
return err
}
// add health checks
server.AddHealthzChecks(healthz.NamedCheck("healthz", mgr.CheckHealth))
// run everything (the apiserver runs the shared informer factory for us)
mgr.RunUntil(stopCh)
return server.GenericAPIServer.PrepareRun().Run(stopCh)
}