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heapster.go
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heapster.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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.
//go:generate ./hooks/run_extpoints.sh
package main
import (
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"net/url"
"os"
"runtime"
"strconv"
"strings"
"time"
"github.com/golang/glog"
"github.com/prometheus/client_golang/prometheus"
"github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apiserver/pkg/server/healthz"
"k8s.io/apiserver/pkg/util/flag"
"k8s.io/apiserver/pkg/util/logs"
kube_client "k8s.io/client-go/kubernetes"
v1listers "k8s.io/client-go/listers/core/v1"
kube_api "k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/heapster/common/flags"
kube_config "k8s.io/heapster/common/kubernetes"
"k8s.io/heapster/metrics/cmd/heapster-apiserver/app"
"k8s.io/heapster/metrics/core"
"k8s.io/heapster/metrics/manager"
"k8s.io/heapster/metrics/options"
"k8s.io/heapster/metrics/processors"
"k8s.io/heapster/metrics/sinks"
metricsink "k8s.io/heapster/metrics/sinks/metric"
"k8s.io/heapster/metrics/sources"
"k8s.io/heapster/metrics/util"
"k8s.io/heapster/version"
)
func main() {
opt := options.NewHeapsterRunOptions()
opt.AddFlags(pflag.CommandLine)
flag.InitFlags()
if opt.Version {
fmt.Println(version.VersionInfo())
os.Exit(0)
}
logs.InitLogs()
defer logs.FlushLogs()
labelCopier, err := util.NewLabelCopier(opt.LabelSeparator, opt.StoredLabels, opt.IgnoredLabels)
if err != nil {
glog.Fatalf("Failed to initialize label copier: %v", err)
}
setMaxProcs(opt)
glog.Infof(strings.Join(os.Args, " "))
glog.Infof("Heapster version %v", version.HeapsterVersion)
if err := validateFlags(opt); err != nil {
glog.Fatal(err)
}
kubernetesUrl, err := getKubernetesAddress(opt.Sources)
if err != nil {
glog.Fatalf("Failed to get kubernetes address: %v", err)
}
sourceManager := createSourceManagerOrDie(opt.Sources)
sinkManager, metricSink, historicalSource := createAndInitSinksOrDie(opt.Sinks, opt.HistoricalSource, opt.SinkExportDataTimeout, opt.DisableMetricSink)
podLister, nodeLister := getListersOrDie(kubernetesUrl)
dataProcessors := createDataProcessorsOrDie(kubernetesUrl, podLister, labelCopier)
man, err := manager.NewManager(sourceManager, dataProcessors, sinkManager,
opt.MetricResolution, manager.DefaultScrapeOffset, manager.DefaultMaxParallelism)
if err != nil {
glog.Fatalf("Failed to create main manager: %v", err)
}
man.Start()
if opt.EnableAPIServer {
// Run API server in a separate goroutine
createAndRunAPIServer(opt, metricSink, nodeLister, podLister)
}
mux := http.NewServeMux()
promHandler := prometheus.Handler()
handler := setupHandlers(metricSink, podLister, nodeLister, historicalSource, opt.DisableMetricExport)
healthz.InstallHandler(mux, healthzChecker(metricSink))
addr := net.JoinHostPort(opt.Ip, strconv.Itoa(opt.Port))
glog.Infof("Starting heapster on port %d", opt.Port)
if len(opt.TLSCertFile) > 0 && len(opt.TLSKeyFile) > 0 {
startSecureServing(opt, handler, promHandler, mux, addr)
} else {
mux.Handle("/", handler)
mux.Handle("/metrics", promHandler)
glog.Fatal(http.ListenAndServe(addr, mux))
}
}
func createAndRunAPIServer(opt *options.HeapsterRunOptions, metricSink *metricsink.MetricSink,
nodeLister v1listers.NodeLister, podLister v1listers.PodLister) {
server, err := app.NewHeapsterApiServer(opt, metricSink, nodeLister, podLister)
if err != nil {
glog.Errorf("Could not create the API server: %v", err)
return
}
server.AddHealthzChecks(healthzChecker(metricSink))
runApiServer := func(s *app.HeapsterAPIServer) {
if err := s.RunServer(); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
}
glog.Infof("Starting Heapster API server...")
go runApiServer(server)
}
func startSecureServing(opt *options.HeapsterRunOptions, handler http.Handler, promHandler http.Handler,
mux *http.ServeMux, address string) {
if len(opt.TLSClientCAFile) > 0 {
authPprofHandler, err := newAuthHandler(opt, handler)
if err != nil {
glog.Fatalf("Failed to create authorized pprof handler: %v", err)
}
handler = authPprofHandler
authPromHandler, err := newAuthHandler(opt, promHandler)
if err != nil {
glog.Fatalf("Failed to create authorized prometheus handler: %v", err)
}
promHandler = authPromHandler
}
mux.Handle("/", handler)
mux.Handle("/metrics", promHandler)
// If allowed users is set, then we need to enable Client Authentication
if len(opt.AllowedUsers) > 0 {
server := &http.Server{
Addr: address,
Handler: mux,
TLSConfig: &tls.Config{ClientAuth: tls.RequestClientCert},
}
glog.Fatal(server.ListenAndServeTLS(opt.TLSCertFile, opt.TLSKeyFile))
} else {
glog.Fatal(http.ListenAndServeTLS(address, opt.TLSCertFile, opt.TLSKeyFile, mux))
}
}
func createSourceManagerOrDie(src flags.Uris) core.MetricsSource {
if len(src) != 1 {
glog.Fatal("Wrong number of sources specified")
}
sourceFactory := sources.NewSourceFactory()
sourceProvider, err := sourceFactory.BuildAll(src)
if err != nil {
glog.Fatalf("Failed to create source provide: %v", err)
}
sourceManager, err := sources.NewSourceManager(sourceProvider, sources.DefaultMetricsScrapeTimeout)
if err != nil {
glog.Fatalf("Failed to create source manager: %v", err)
}
return sourceManager
}
func createAndInitSinksOrDie(sinkAddresses flags.Uris, historicalSource string, sinkExportDataTimeout time.Duration, disableMetricSink bool) (core.DataSink, *metricsink.MetricSink, core.HistoricalSource) {
sinksFactory := sinks.NewSinkFactory()
metricSink, sinkList, histSource := sinksFactory.BuildAll(sinkAddresses, historicalSource, disableMetricSink)
if metricSink == nil && !disableMetricSink {
glog.Fatal("Failed to create metric sink")
}
if histSource == nil && len(historicalSource) > 0 {
glog.Fatal("Failed to use a sink as a historical metrics source")
}
for _, sink := range sinkList {
glog.Infof("Starting with %s", sink.Name())
}
sinkManager, err := sinks.NewDataSinkManager(sinkList, sinkExportDataTimeout, sinks.DefaultSinkStopTimeout)
if err != nil {
glog.Fatalf("Failed to create sink manager: %v", err)
}
return sinkManager, metricSink, histSource
}
func getListersOrDie(kubernetesUrl *url.URL) (v1listers.PodLister, v1listers.NodeLister) {
kubeClient := createKubeClientOrDie(kubernetesUrl)
podLister, err := getPodLister(kubeClient)
if err != nil {
glog.Fatalf("Failed to create podLister: %v", err)
}
nodeLister, _, err := util.GetNodeLister(kubeClient)
if err != nil {
glog.Fatalf("Failed to create nodeLister: %v", err)
}
return podLister, nodeLister
}
func createKubeClientOrDie(kubernetesUrl *url.URL) *kube_client.Clientset {
kubeConfig, err := kube_config.GetKubeClientConfig(kubernetesUrl)
if err != nil {
glog.Fatalf("Failed to get client config: %v", err)
}
return kube_client.NewForConfigOrDie(kubeConfig)
}
func createDataProcessorsOrDie(kubernetesUrl *url.URL, podLister v1listers.PodLister, labelCopier *util.LabelCopier) []core.DataProcessor {
dataProcessors := []core.DataProcessor{
// Convert cumulative to rate
processors.NewRateCalculator(core.RateMetricsMapping),
}
podBasedEnricher, err := processors.NewPodBasedEnricher(podLister, labelCopier)
if err != nil {
glog.Fatalf("Failed to create PodBasedEnricher: %v", err)
}
dataProcessors = append(dataProcessors, podBasedEnricher)
namespaceBasedEnricher, err := processors.NewNamespaceBasedEnricher(kubernetesUrl)
if err != nil {
glog.Fatalf("Failed to create NamespaceBasedEnricher: %v", err)
}
dataProcessors = append(dataProcessors, namespaceBasedEnricher)
// aggregators
metricsToAggregate := []string{
core.MetricCpuUsageRate.Name,
core.MetricMemoryUsage.Name,
core.MetricCpuRequest.Name,
core.MetricCpuLimit.Name,
core.MetricMemoryRequest.Name,
core.MetricMemoryLimit.Name,
}
metricsToAggregateForNode := []string{
core.MetricCpuRequest.Name,
core.MetricCpuLimit.Name,
core.MetricMemoryRequest.Name,
core.MetricMemoryLimit.Name,
}
dataProcessors = append(dataProcessors,
processors.NewPodAggregator(),
&processors.NamespaceAggregator{
MetricsToAggregate: metricsToAggregate,
},
&processors.NodeAggregator{
MetricsToAggregate: metricsToAggregateForNode,
},
&processors.ClusterAggregator{
MetricsToAggregate: metricsToAggregate,
})
nodeAutoscalingEnricher, err := processors.NewNodeAutoscalingEnricher(kubernetesUrl, labelCopier)
if err != nil {
glog.Fatalf("Failed to create NodeAutoscalingEnricher: %v", err)
}
dataProcessors = append(dataProcessors, nodeAutoscalingEnricher)
return dataProcessors
}
const (
minMetricsCount = 1
maxMetricsDelay = 3 * time.Minute
)
func healthzChecker(metricSink *metricsink.MetricSink) healthz.HealthzChecker {
return healthz.NamedCheck("healthz", func(r *http.Request) error {
batch := metricSink.GetLatestDataBatch()
if batch == nil {
return errors.New("could not get the latest data batch")
}
if time.Since(batch.Timestamp) > maxMetricsDelay {
message := fmt.Sprintf("No current data batch available (latest: %s).", batch.Timestamp.String())
glog.Warningf(message)
return errors.New(message)
}
if len(batch.MetricSets) < minMetricsCount {
message := fmt.Sprintf("Not enough metrics found in the latest data batch: %d (expected min. %d) %s", len(batch.MetricSets), minMetricsCount, batch.Timestamp.String())
glog.Warningf(message)
return errors.New(message)
}
return nil
})
}
// Gets the address of the kubernetes source from the list of source URIs.
// Possible kubernetes sources are: 'kubernetes' and 'kubernetes.summary_api'
func getKubernetesAddress(args flags.Uris) (*url.URL, error) {
for _, uri := range args {
if strings.SplitN(uri.Key, ".", 2)[0] == "kubernetes" {
return &uri.Val, nil
}
}
return nil, fmt.Errorf("No kubernetes source found.")
}
func getPodLister(kubeClient *kube_client.Clientset) (v1listers.PodLister, error) {
lw := cache.NewListWatchFromClient(kubeClient.Core().RESTClient(), "pods", kube_api.NamespaceAll, fields.Everything())
store := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
podLister := v1listers.NewPodLister(store)
reflector := cache.NewReflector(lw, &kube_api.Pod{}, store, time.Hour)
reflector.Run()
return podLister, nil
}
func validateFlags(opt *options.HeapsterRunOptions) error {
if opt.MetricResolution < 5*time.Second {
return fmt.Errorf("metric resolution should not be less than 5 seconds - %d", opt.MetricResolution)
}
if (len(opt.TLSCertFile) > 0 && len(opt.TLSKeyFile) == 0) || (len(opt.TLSCertFile) == 0 && len(opt.TLSKeyFile) > 0) {
return fmt.Errorf("both TLS certificate & key are required to enable TLS serving")
}
if len(opt.TLSClientCAFile) > 0 && len(opt.TLSCertFile) == 0 {
return fmt.Errorf("client cert authentication requires TLS certificate & key")
}
return nil
}
func setMaxProcs(opt *options.HeapsterRunOptions) {
// Allow as many threads as we have cores unless the user specified a value.
var numProcs int
if opt.MaxProcs < 1 {
numProcs = runtime.NumCPU()
} else {
numProcs = opt.MaxProcs
}
runtime.GOMAXPROCS(numProcs)
// Check if the setting was successful.
actualNumProcs := runtime.GOMAXPROCS(0)
if actualNumProcs != numProcs {
glog.Warningf("Specified max procs of %d but using %d", numProcs, actualNumProcs)
}
}