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cadvisor.go
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cadvisor.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.
package main
import (
"flag"
"fmt"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"runtime"
"syscall"
"time"
"github.com/golang/glog"
cadvisorHttp "github.com/google/cadvisor/http"
"github.com/google/cadvisor/manager"
"github.com/google/cadvisor/utils/sysfs"
"github.com/google/cadvisor/version"
)
var argIp = flag.String("listen_ip", "", "IP to listen on, defaults to all IPs")
var argPort = flag.Int("port", 8080, "port to listen")
var maxProcs = flag.Int("max_procs", 0, "max number of CPUs that can be used simultaneously. Less than 1 for default (number of cores).")
var argDbDriver = flag.String("storage_driver", "", "storage driver to use. Data is always cached shortly in memory, this controls where data is pushed besides the local cache. Empty means none. Options are: <empty> (default), bigquery, and influxdb")
var versionFlag = flag.Bool("version", false, "print cAdvisor version and exit")
var httpAuthFile = flag.String("http_auth_file", "", "HTTP auth file for the web UI")
var httpAuthRealm = flag.String("http_auth_realm", "localhost", "HTTP auth realm for the web UI")
var httpDigestFile = flag.String("http_digest_file", "", "HTTP digest file for the web UI")
var httpDigestRealm = flag.String("http_digest_realm", "localhost", "HTTP digest file for the web UI")
var prometheusEndpoint = flag.String("prometheus_endpoint", "/metrics", "Endpoint to expose Prometheus metrics on")
var maxHousekeepingInterval = flag.Duration("max_housekeeping_interval", 60*time.Second, "Largest interval to allow between container housekeepings")
var allowDynamicHousekeeping = flag.Bool("allow_dynamic_housekeeping", true, "Whether to allow the housekeeping interval to be dynamic")
func main() {
defer glog.Flush()
flag.Parse()
if *versionFlag {
fmt.Printf("cAdvisor version %s\n", version.VERSION)
os.Exit(0)
}
setMaxProcs()
memoryStorage, err := NewMemoryStorage(*argDbDriver)
if err != nil {
glog.Fatalf("Failed to connect to database: %s", err)
}
sysFs, err := sysfs.NewRealSysFs()
if err != nil {
glog.Fatalf("Failed to create a system interface: %s", err)
}
containerManager, err := manager.New(memoryStorage, sysFs, *maxHousekeepingInterval, *allowDynamicHousekeeping)
if err != nil {
glog.Fatalf("Failed to create a Container Manager: %s", err)
}
mux := http.DefaultServeMux
// Register all HTTP handlers.
err = cadvisorHttp.RegisterHandlers(mux, containerManager, *httpAuthFile, *httpAuthRealm, *httpDigestFile, *httpDigestRealm, *prometheusEndpoint)
if err != nil {
glog.Fatalf("Failed to register HTTP handlers: %v", err)
}
// Start the manager.
if err := containerManager.Start(); err != nil {
glog.Fatalf("Failed to start container manager: %v", err)
}
// Install signal handler.
installSignalHandler(containerManager)
glog.Infof("Starting cAdvisor version: %q on port %d", version.VERSION, *argPort)
addr := fmt.Sprintf("%s:%d", *argIp, *argPort)
glog.Fatal(http.ListenAndServe(addr, nil))
}
func setMaxProcs() {
// TODO(vmarmol): Consider limiting if we have a CPU mask in effect.
// Allow as many threads as we have cores unless the user specified a value.
var numProcs int
if *maxProcs < 1 {
numProcs = runtime.NumCPU()
} else {
numProcs = *maxProcs
}
runtime.GOMAXPROCS(numProcs)
// Check if the setting was successful.
actualNumProcs := runtime.GOMAXPROCS(0)
if actualNumProcs != numProcs {
glog.Warningf("Specified max procs of %v but using %v", numProcs, actualNumProcs)
}
}
func installSignalHandler(containerManager manager.Manager) {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill, syscall.SIGTERM)
// Block until a signal is received.
go func() {
sig := <-c
if err := containerManager.Stop(); err != nil {
glog.Errorf("Failed to stop container manager: %v", err)
}
glog.Infof("Exiting given signal: %v", sig)
os.Exit(0)
}()
}