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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 (
"flag"
"fmt"
"net/http"
"net/url"
"os"
"runtime"
"strings"
"time"
"github.com/golang/glog"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/heapster/common/flags"
"k8s.io/heapster/metrics/core"
"k8s.io/heapster/metrics/manager"
"k8s.io/heapster/metrics/processors"
"k8s.io/heapster/metrics/sinks"
"k8s.io/heapster/metrics/sources"
"k8s.io/heapster/version"
)
var (
argMetricResolution = flag.Duration("metric_resolution", 30*time.Second, "The resolution at which heapster will retain metrics.")
argPort = flag.Int("port", 8082, "port to listen to")
argIp = flag.String("listen_ip", "", "IP to listen on, defaults to all IPs")
argMaxProcs = flag.Int("max_procs", 0, "max number of CPUs that can be used simultaneously. Less than 1 for default (number of cores)")
argTLSCertFile = flag.String("tls_cert", "", "file containing TLS certificate")
argTLSKeyFile = flag.String("tls_key", "", "file containing TLS key")
argTLSClientCAFile = flag.String("tls_client_ca", "", "file containing TLS client CA for client cert validation")
argAllowedUsers = flag.String("allowed_users", "", "comma-separated list of allowed users")
argSources flags.Uris
argSinks flags.Uris
)
func main() {
defer glog.Flush()
flag.Var(&argSources, "source", "source(s) to watch")
flag.Var(&argSinks, "sink", "external sink(s) that receive data")
flag.Parse()
setMaxProcs()
glog.Infof(strings.Join(os.Args, " "))
glog.Infof("Heapster version %v", version.HeapsterVersion)
if err := validateFlags(); err != nil {
glog.Fatal(err)
}
// sources
if len(argSources) != 1 {
glog.Fatal("wrong number of sources specified")
}
sourceFactory := sources.NewSourceFactory()
sourceProvider, err := sourceFactory.BuildAll(argSources)
if err != nil {
glog.Fatal(err)
}
sourceManager, err := sources.NewSourceManager(sourceProvider, sources.DefaultMetricsScrapeTimeout)
if err != nil {
glog.Fatal(err)
}
// sinks
sinksFactory := sinks.NewSinkFactory()
metricSink, sinkList := sinksFactory.BuildAll(argSinks)
if metricSink == nil {
glog.Fatalf("Failed to create metric sink")
}
for _, sink := range sinkList {
glog.Infof("Starting with %s sink", sink.Name())
}
sinkManager, err := sinks.NewDataSinkManager(sinkList, sinks.DefaultSinkExportDataTimeout, sinks.DefaultSinkStopTimeout)
if err != nil {
glog.Fatal(err)
}
// data processors
metricsToAggregate := []string{
core.MetricCpuUsageRate.Name,
core.MetricMemoruUsage.Name,
core.MetricCpuRequest.Name,
core.MetricCpuLimit.Name,
core.MetricMemoryRequest.Name,
core.MetricMemoryLimit.Name,
}
dataProcessors := []core.DataProcessor{}
// pod enricher goes first
if url, err := getKubernetesAddress(argSources); err == nil {
podBasedEnricher, err := processors.NewPodBasedEnricher(url)
if err != nil {
glog.Fatalf("Failed to create PodBasedEnricher: %v", err)
} else {
dataProcessors = append(dataProcessors, podBasedEnricher)
}
namespaceBasedEnricher, err := processors.NewNamespaceBasedEnricher(url)
if err != nil {
glog.Fatalf("Failed to create NamespaceBasedEnricher: %v", err)
} else {
dataProcessors = append(dataProcessors, namespaceBasedEnricher)
}
}
// then aggregators
dataProcessors = append(dataProcessors,
&processors.PodAggregator{},
&processors.NamespaceAggregator{
MetricsToAggregate: metricsToAggregate,
},
&processors.NodeAggregator{
MetricsToAggregate: metricsToAggregate,
},
&processors.ClusterAggregator{
MetricsToAggregate: metricsToAggregate,
})
// main manager
manager, err := manager.NewManager(sourceManager, dataProcessors, sinkManager, *argMetricResolution,
manager.DefaultScrapeOffset, manager.DefaultMaxParallelism)
if err != nil {
glog.Fatal(err)
}
manager.Start()
handler := setupHandlers(metricSink)
addr := fmt.Sprintf("%s:%d", *argIp, *argPort)
glog.Infof("Starting heapster on port %d", *argPort)
mux := http.NewServeMux()
promHandler := prometheus.Handler()
if len(*argTLSCertFile) > 0 && len(*argTLSKeyFile) > 0 {
if len(*argTLSClientCAFile) > 0 {
authPprofHandler, err := newAuthHandler(handler)
if err != nil {
glog.Fatal(err)
}
handler = authPprofHandler
authPromHandler, err := newAuthHandler(promHandler)
if err != nil {
glog.Fatal(err)
}
promHandler = authPromHandler
}
mux.Handle("/", handler)
mux.Handle("/metrics", promHandler)
glog.Fatal(http.ListenAndServeTLS(addr, *argTLSCertFile, *argTLSKeyFile, mux))
} else {
mux.Handle("/", handler)
mux.Handle("/metrics", promHandler)
glog.Fatal(http.ListenAndServe(addr, mux))
}
}
func getKubernetesAddress(args flags.Uris) (*url.URL, error) {
for _, uri := range args {
if uri.Key == "kubernetes" {
return &uri.Val, nil
}
}
return nil, fmt.Errorf("No kubernetes source found.")
}
func validateFlags() error {
if *argMetricResolution < 5*time.Second {
return fmt.Errorf("metric resolution needs to be greater than 5 seconds - %d", *argMetricResolution)
}
if (len(*argTLSCertFile) > 0 && len(*argTLSKeyFile) == 0) || (len(*argTLSCertFile) == 0 && len(*argTLSKeyFile) > 0) {
return fmt.Errorf("both TLS certificate & key are required to enable TLS serving")
}
if len(*argTLSClientCAFile) > 0 && len(*argTLSCertFile) == 0 {
return fmt.Errorf("client cert authentication requires TLS certificate & key")
}
return nil
}
func setMaxProcs() {
// Allow as many threads as we have cores unless the user specified a value.
var numProcs int
if *argMaxProcs < 1 {
numProcs = runtime.NumCPU()
} else {
numProcs = *argMaxProcs
}
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)
}
}