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main.go
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// Copyright 2015 The Prometheus 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.
// The main package for the Prometheus server executable.
package main
import (
"fmt"
"net"
_ "net/http/pprof" // Comment this line to disable pprof endpoint.
"net/url"
"os"
"os/signal"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/asaskevich/govalidator"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/common/version"
"golang.org/x/net/context"
"gopkg.in/alecthomas/kingpin.v2"
k8s_runtime "k8s.io/apimachinery/pkg/util/runtime"
"github.com/prometheus/common/promlog"
promlogflag "github.com/prometheus/common/promlog/flag"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/notifier"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/retrieval"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/storage/remote"
"github.com/prometheus/prometheus/storage/tsdb"
"github.com/prometheus/prometheus/web"
)
var (
configSuccess = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prometheus",
Name: "config_last_reload_successful",
Help: "Whether the last configuration reload attempt was successful.",
})
configSuccessTime = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prometheus",
Name: "config_last_reload_success_timestamp_seconds",
Help: "Timestamp of the last successful configuration reload.",
})
)
func init() {
prometheus.MustRegister(version.NewCollector("prometheus"))
}
func main() {
if os.Getenv("DEBUG") != "" {
runtime.SetBlockProfileRate(20)
runtime.SetMutexProfileFraction(20)
}
cfg := struct {
printVersion bool
configFile string
localStoragePath string
notifier notifier.Options
notifierTimeout model.Duration
queryEngine promql.EngineOptions
web web.Options
tsdb tsdb.Options
lookbackDelta model.Duration
webTimeout model.Duration
queryTimeout model.Duration
prometheusURL string
logLevel promlog.AllowedLevel
}{
notifier: notifier.Options{
Registerer: prometheus.DefaultRegisterer,
},
}
a := kingpin.New(filepath.Base(os.Args[0]), "The Prometheus monitoring server")
a.Version(version.Print("prometheus"))
a.HelpFlag.Short('h')
a.Flag("config.file", "Prometheus configuration file path.").
Default("prometheus.yml").StringVar(&cfg.configFile)
a.Flag("web.listen-address", "Address to listen on for UI, API, and telemtry.").
Default("0.0.0.0:9090").StringVar(&cfg.web.ListenAddress)
a.Flag("web.read-timeout",
"Maximum duration before timing out read of the request, and closing idle connections.").
Default("5m").SetValue(&cfg.webTimeout)
a.Flag("web.max-connections", "Maximum number of simultaneous connections.").
Default("512").IntVar(&cfg.web.MaxConnections)
a.Flag("web.external-url",
"The URL under which Prometheus is externally reachable (for example, if Prometheus is served via a reverse proxy). Used for generating relative and absolute links back to Prometheus itself. If the URL has a path portion, it will be used to prefix all HTTP endpoints served by Prometheus. If omitted, relevant URL components will be derived automatically.").
PlaceHolder("<URL>").StringVar(&cfg.prometheusURL)
a.Flag("web.route-prefix",
"Prefix for the internal routes of web endpoints. Defaults to path of --web.external-url.").
PlaceHolder("<path>").StringVar(&cfg.web.RoutePrefix)
a.Flag("web.user-assets", "Path to static asset directory, available at /user.").
PlaceHolder("<path>").StringVar(&cfg.web.UserAssetsPath)
a.Flag("web.enable-lifecycle", "Enable shutdown and reload via HTTP request.").
Default("false").BoolVar(&cfg.web.EnableLifecycle)
a.Flag("web.enable-admin-api", "Enables API endpoints for admin control actions.").
Default("false").BoolVar(&cfg.web.EnableAdminAPI)
a.Flag("web.console.templates", "Path to the console template directory, available at /consoles.").
Default("consoles").StringVar(&cfg.web.ConsoleTemplatesPath)
a.Flag("web.console.libraries", "Path to the console library directory.").
Default("console_libraries").StringVar(&cfg.web.ConsoleLibrariesPath)
a.Flag("storage.tsdb.path", "Base path for metrics storage.").
Default("data/").StringVar(&cfg.localStoragePath)
a.Flag("storage.tsdb.min-block-duration", "Minimum duration of a data block before being persisted.").
Default("2h").SetValue(&cfg.tsdb.MinBlockDuration)
a.Flag("storage.tsdb.max-block-duration",
"Maximum duration compacted blocks may span. (Defaults to 10% of the retention period)").
PlaceHolder("<duration>").SetValue(&cfg.tsdb.MaxBlockDuration)
a.Flag("storage.tsdb.retention", "How long to retain samples in the storage.").
Default("15d").SetValue(&cfg.tsdb.Retention)
a.Flag("storage.tsdb.no-lockfile", "Do not create lockfile in data directory.").
Default("false").BoolVar(&cfg.tsdb.NoLockfile)
a.Flag("alertmanager.notification-queue-capacity", "The capacity of the queue for pending alert manager notifications.").
Default("10000").IntVar(&cfg.notifier.QueueCapacity)
a.Flag("alertmanager.timeout", "Timeout for sending alerts to Alertmanager.").
Default("10s").SetValue(&cfg.notifierTimeout)
a.Flag("query.lookback-delta", "The delta difference allowed for retrieving metrics during expression evaluations.").
Default("5m").SetValue(&cfg.lookbackDelta)
a.Flag("query.timeout", "Maximum time a query may take before being aborted.").
Default("2m").SetValue(&cfg.queryTimeout)
a.Flag("query.max-concurrency", "Maximum number of queries executed concurrently.").
Default("20").IntVar(&cfg.queryEngine.MaxConcurrentQueries)
promlogflag.AddFlags(a, &cfg.logLevel)
_, err := a.Parse(os.Args[1:])
if err != nil {
a.Usage(os.Args[1:])
os.Exit(2)
}
cfg.web.ExternalURL, err = computeExternalURL(cfg.prometheusURL, cfg.web.ListenAddress)
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "parse external URL %q", cfg.prometheusURL))
os.Exit(2)
}
cfg.web.ReadTimeout = time.Duration(cfg.webTimeout)
// Default -web.route-prefix to path of -web.external-url.
if cfg.web.RoutePrefix == "" {
cfg.web.RoutePrefix = cfg.web.ExternalURL.Path
}
// RoutePrefix must always be at least '/'.
cfg.web.RoutePrefix = "/" + strings.Trim(cfg.web.RoutePrefix, "/")
if cfg.tsdb.MaxBlockDuration == 0 {
cfg.tsdb.MaxBlockDuration = cfg.tsdb.Retention / 10
}
promql.LookbackDelta = time.Duration(cfg.lookbackDelta)
cfg.queryEngine.Timeout = time.Duration(cfg.queryTimeout)
logger := promlog.New(cfg.logLevel)
// XXX(fabxc): Kubernetes does background logging which we can only customize by modifying
// a global variable.
// Ultimately, here is the best place to set it.
k8s_runtime.ErrorHandlers = []func(error){
func(err error) {
level.Error(log.With(logger, "component", "k8s_client_runtime")).Log("err", err)
},
}
level.Info(logger).Log("msg", "Starting prometheus", "version", version.Info())
level.Info(logger).Log("build_context", version.BuildContext())
level.Info(logger).Log("host_details", Uname())
// Make sure that sighup handler is registered with a redirect to the channel before the potentially
// long and synchronous tsdb init.
hup := make(chan os.Signal)
hupReady := make(chan bool)
signal.Notify(hup, syscall.SIGHUP)
var (
localStorage = &tsdb.ReadyStorage{}
remoteStorage = remote.NewStorage(log.With(logger, "component", "remote"))
fanoutStorage = storage.NewFanout(logger, localStorage, remoteStorage)
)
cfg.queryEngine.Logger = log.With(logger, "component", "query engine")
var (
notifier = notifier.New(&cfg.notifier, log.With(logger, "component", "notifier"))
targetManager = retrieval.NewTargetManager(fanoutStorage, log.With(logger, "component", "target manager"))
queryEngine = promql.NewEngine(fanoutStorage, &cfg.queryEngine)
ctx, cancelCtx = context.WithCancel(context.Background())
)
ruleManager := rules.NewManager(&rules.ManagerOptions{
Appendable: fanoutStorage,
Notifier: notifier,
QueryEngine: queryEngine,
Context: ctx,
ExternalURL: cfg.web.ExternalURL,
Logger: log.With(logger, "component", "rule manager"),
})
cfg.web.Context = ctx
cfg.web.TSDB = localStorage.Get
cfg.web.Storage = fanoutStorage
cfg.web.QueryEngine = queryEngine
cfg.web.TargetManager = targetManager
cfg.web.RuleManager = ruleManager
cfg.web.Notifier = notifier
cfg.web.Version = &web.PrometheusVersion{
Version: version.Version,
Revision: version.Revision,
Branch: version.Branch,
BuildUser: version.BuildUser,
BuildDate: version.BuildDate,
GoVersion: version.GoVersion,
}
cfg.web.Flags = map[string]string{}
for _, f := range a.Model().Flags {
cfg.web.Flags[f.Name] = f.Value.String()
}
webHandler := web.New(log.With(logger, "component", "web"), &cfg.web)
reloadables := []Reloadable{
remoteStorage,
targetManager,
ruleManager,
webHandler,
notifier,
}
// Wait for reload or termination signals. Start the handler for SIGHUP as
// early as possible, but ignore it until we are ready to handle reloading
// our config.
go func() {
<-hupReady
for {
select {
case <-hup:
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
}
case rc := <-webHandler.Reload():
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
rc <- err
} else {
rc <- nil
}
}
}
}()
// Start all components while we wait for TSDB to open but only load
// initial config and mark ourselves as ready after it completed.
dbOpen := make(chan struct{})
go func() {
defer close(dbOpen)
level.Info(logger).Log("msg", "Starting TSDB")
db, err := tsdb.Open(
cfg.localStoragePath,
log.With(logger, "component", "tsdb"),
prometheus.DefaultRegisterer,
&cfg.tsdb,
)
if err != nil {
level.Error(logger).Log("msg", "Opening storage failed", "err", err)
os.Exit(1)
}
level.Info(logger).Log("msg", "TSDB started")
localStorage.Set(db)
}()
prometheus.MustRegister(configSuccess)
prometheus.MustRegister(configSuccessTime)
// The notifier is a dependency of the rule manager. It has to be
// started before and torn down afterwards.
go notifier.Run()
defer notifier.Stop()
go ruleManager.Run()
defer ruleManager.Stop()
go targetManager.Run()
defer targetManager.Stop()
// Shutting down the query engine before the rule manager will cause pending queries
// to be canceled and ensures a quick shutdown of the rule manager.
defer cancelCtx()
errc := make(chan error)
go func() { errc <- webHandler.Run(ctx) }()
<-dbOpen
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error loading config", "err", err)
os.Exit(1)
}
defer func() {
if err := fanoutStorage.Close(); err != nil {
level.Error(logger).Log("msg", "Error stopping storage", "err", err)
}
}()
// Wait for reload or termination signals.
close(hupReady) // Unblock SIGHUP handler.
// Set web server to ready.
webHandler.Ready()
level.Info(logger).Log("msg", "Server is ready to receive requests.")
term := make(chan os.Signal)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
select {
case <-term:
level.Warn(logger).Log("msg", "Received SIGTERM, exiting gracefully...")
case <-webHandler.Quit():
level.Warn(logger).Log("msg", "Received termination request via web service, exiting gracefully...")
case err := <-errc:
level.Error(logger).Log("msg", "Error starting web server, exiting gracefully", "err", err)
}
level.Info(logger).Log("msg", "See you next time!")
}
// Reloadable things can change their internal state to match a new config
// and handle failure gracefully.
type Reloadable interface {
ApplyConfig(*config.Config) error
}
func reloadConfig(filename string, logger log.Logger, rls ...Reloadable) (err error) {
level.Info(logger).Log("msg", "Loading configuration file", "filename", filename)
defer func() {
if err == nil {
configSuccess.Set(1)
configSuccessTime.Set(float64(time.Now().Unix()))
} else {
configSuccess.Set(0)
}
}()
conf, err := config.LoadFile(filename)
if err != nil {
return fmt.Errorf("couldn't load configuration (--config.file=%s): %v", filename, err)
}
failed := false
for _, rl := range rls {
if err := rl.ApplyConfig(conf); err != nil {
level.Error(logger).Log("msg", "Failed to apply configuration", "err", err)
failed = true
}
}
if failed {
return fmt.Errorf("one or more errors occurred while applying the new configuration (--config.file=%s)", filename)
}
return nil
}
// computeExternalURL computes a sanitized external URL from a raw input. It infers unset
// URL parts from the OS and the given listen address.
func computeExternalURL(u, listenAddr string) (*url.URL, error) {
if u == "" {
hostname, err := os.Hostname()
if err != nil {
return nil, err
}
_, port, err := net.SplitHostPort(listenAddr)
if err != nil {
return nil, err
}
u = fmt.Sprintf("http://%s:%s/", hostname, port)
}
if ok := govalidator.IsURL(u); !ok {
return nil, fmt.Errorf("invalid external URL %q", u)
}
eu, err := url.Parse(u)
if err != nil {
return nil, err
}
ppref := strings.TrimRight(eu.Path, "/")
if ppref != "" && !strings.HasPrefix(ppref, "/") {
ppref = "/" + ppref
}
eu.Path = ppref
return eu, nil
}