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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 (
"context"
"fmt"
"io"
"math"
"math/bits"
"net"
"net/http"
_ "net/http/pprof" // Comment this line to disable pprof endpoint.
"net/url"
"os"
"os/signal"
"path/filepath"
"regexp"
"runtime"
"strings"
"sync"
"syscall"
"time"
"github.com/alecthomas/units"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
conntrack "github.com/mwitkow/go-conntrack"
"github.com/oklog/run"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/common/promlog"
promlogflag "github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
toolkit_web "github.com/prometheus/exporter-toolkit/web"
toolkit_webflag "github.com/prometheus/exporter-toolkit/web/kingpinflag"
jcfg "github.com/uber/jaeger-client-go/config"
jprom "github.com/uber/jaeger-lib/metrics/prometheus"
"go.uber.org/atomic"
kingpin "gopkg.in/alecthomas/kingpin.v2"
klog "k8s.io/klog"
klogv2 "k8s.io/klog/v2"
"github.com/adolli/prometheus/config"
"github.com/adolli/prometheus/discovery"
_ "github.com/adolli/prometheus/discovery/install" // Register service discovery implementations.
"github.com/adolli/prometheus/notifier"
"github.com/adolli/prometheus/pkg/exemplar"
"github.com/adolli/prometheus/pkg/labels"
"github.com/adolli/prometheus/pkg/logging"
"github.com/adolli/prometheus/pkg/relabel"
prom_runtime "github.com/adolli/prometheus/pkg/runtime"
"github.com/adolli/prometheus/promql"
"github.com/adolli/prometheus/rules"
"github.com/adolli/prometheus/scrape"
"github.com/adolli/prometheus/storage"
"github.com/adolli/prometheus/storage/remote"
"github.com/adolli/prometheus/tsdb"
"github.com/adolli/prometheus/util/strutil"
"github.com/adolli/prometheus/web"
)
var (
configSuccess = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_config_last_reload_successful",
Help: "Whether the last configuration reload attempt was successful.",
})
configSuccessTime = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_config_last_reload_success_timestamp_seconds",
Help: "Timestamp of the last successful configuration reload.",
})
defaultRetentionString = "15d"
defaultRetentionDuration model.Duration
)
func init() {
prometheus.MustRegister(version.NewCollector("prometheus"))
var err error
defaultRetentionDuration, err = model.ParseDuration(defaultRetentionString)
if err != nil {
panic(err)
}
}
type flagConfig struct {
configFile string
localStoragePath string
notifier notifier.Options
forGracePeriod model.Duration
outageTolerance model.Duration
resendDelay model.Duration
web web.Options
tsdb tsdbOptions
lookbackDelta model.Duration
webTimeout model.Duration
queryTimeout model.Duration
queryConcurrency int
queryMaxSamples int
RemoteFlushDeadline model.Duration
featureList []string
// These options are extracted from featureList
// for ease of use.
enablePromQLAtModifier bool
enablePromQLNegativeOffset bool
prometheusURL string
corsRegexString string
promlogConfig promlog.Config
}
// setFeatureListOptions sets the corresponding options from the featureList.
func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
maxExemplars := c.tsdb.MaxExemplars
// Disabled at first. Value from the flag is used if exemplar-storage is set.
c.tsdb.MaxExemplars = 0
for _, f := range c.featureList {
opts := strings.Split(f, ",")
for _, o := range opts {
switch o {
case "promql-at-modifier":
c.enablePromQLAtModifier = true
level.Info(logger).Log("msg", "Experimental promql-at-modifier enabled")
case "promql-negative-offset":
c.enablePromQLNegativeOffset = true
level.Info(logger).Log("msg", "Experimental promql-negative-offset enabled")
case "remote-write-receiver":
c.web.RemoteWriteReceiver = true
level.Info(logger).Log("msg", "Experimental remote-write-receiver enabled")
case "exemplar-storage":
c.tsdb.MaxExemplars = maxExemplars
level.Info(logger).Log("msg", "Experimental in-memory exemplar storage enabled")
case "":
continue
default:
level.Warn(logger).Log("msg", "Unknown option for --enable-feature", "option", o)
}
}
}
return nil
}
func main() {
if os.Getenv("DEBUG") != "" {
runtime.SetBlockProfileRate(20)
runtime.SetMutexProfileFraction(20)
}
var (
oldFlagRetentionDuration model.Duration
newFlagRetentionDuration model.Duration
)
cfg := flagConfig{
notifier: notifier.Options{
Registerer: prometheus.DefaultRegisterer,
},
web: web.Options{
Registerer: prometheus.DefaultRegisterer,
Gatherer: prometheus.DefaultGatherer,
},
promlogConfig: promlog.Config{},
}
a := kingpin.New(filepath.Base(os.Args[0]), "The Prometheus monitoring server").UsageWriter(os.Stdout)
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 telemetry.").
Default("0.0.0.0:9090").StringVar(&cfg.web.ListenAddress)
webConfig := toolkit_webflag.AddFlags(a)
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", "Enable 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("web.page-title", "Document title of Prometheus instance.").
Default("Prometheus Time Series Collection and Processing Server").StringVar(&cfg.web.PageTitle)
a.Flag("web.cors.origin", `Regex for CORS origin. It is fully anchored. Example: 'https?://(domain1|domain2)\.com'`).
Default(".*").StringVar(&cfg.corsRegexString)
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. For use in testing.").
Hidden().Default("2h").SetValue(&cfg.tsdb.MinBlockDuration)
a.Flag("storage.tsdb.max-block-duration",
"Maximum duration compacted blocks may span. For use in testing. (Defaults to 10% of the retention period.)").
Hidden().PlaceHolder("<duration>").SetValue(&cfg.tsdb.MaxBlockDuration)
a.Flag("storage.tsdb.wal-segment-size",
"Size at which to split the tsdb WAL segment files. Example: 100MB").
Hidden().PlaceHolder("<bytes>").BytesVar(&cfg.tsdb.WALSegmentSize)
a.Flag("storage.tsdb.retention", "[DEPRECATED] How long to retain samples in storage. This flag has been deprecated, use \"storage.tsdb.retention.time\" instead.").
SetValue(&oldFlagRetentionDuration)
a.Flag("storage.tsdb.retention.time", "How long to retain samples in storage. When this flag is set it overrides \"storage.tsdb.retention\". If neither this flag nor \"storage.tsdb.retention\" nor \"storage.tsdb.retention.size\" is set, the retention time defaults to "+defaultRetentionString+". Units Supported: y, w, d, h, m, s, ms.").
SetValue(&newFlagRetentionDuration)
a.Flag("storage.tsdb.retention.size", "[EXPERIMENTAL] Maximum number of bytes that can be stored for blocks. A unit is required, supported units: B, KB, MB, GB, TB, PB, EB. Ex: \"512MB\". This flag is experimental and can be changed in future releases.").
BytesVar(&cfg.tsdb.MaxBytes)
a.Flag("storage.tsdb.no-lockfile", "Do not create lockfile in data directory.").
Default("false").BoolVar(&cfg.tsdb.NoLockfile)
a.Flag("storage.tsdb.allow-overlapping-blocks", "[EXPERIMENTAL] Allow overlapping blocks, which in turn enables vertical compaction and vertical query merge.").
Default("false").BoolVar(&cfg.tsdb.AllowOverlappingBlocks)
a.Flag("storage.tsdb.wal-compression", "Compress the tsdb WAL.").
Default("true").BoolVar(&cfg.tsdb.WALCompression)
a.Flag("storage.remote.flush-deadline", "How long to wait flushing sample on shutdown or config reload.").
Default("1m").PlaceHolder("<duration>").SetValue(&cfg.RemoteFlushDeadline)
a.Flag("storage.remote.read-sample-limit", "Maximum overall number of samples to return via the remote read interface, in a single query. 0 means no limit. This limit is ignored for streamed response types.").
Default("5e7").IntVar(&cfg.web.RemoteReadSampleLimit)
a.Flag("storage.remote.read-concurrent-limit", "Maximum number of concurrent remote read calls. 0 means no limit.").
Default("10").IntVar(&cfg.web.RemoteReadConcurrencyLimit)
a.Flag("storage.remote.read-max-bytes-in-frame", "Maximum number of bytes in a single frame for streaming remote read response types before marshalling. Note that client might have limit on frame size as well. 1MB as recommended by protobuf by default.").
Default("1048576").IntVar(&cfg.web.RemoteReadBytesInFrame)
a.Flag("storage.exemplars.exemplars-limit", "[EXPERIMENTAL] Maximum number of exemplars to store in in-memory exemplar storage total. 0 disables the exemplar storage. This flag is effective only with --enable-feature=exemplar-storage.").
Default("100000").IntVar(&cfg.tsdb.MaxExemplars)
a.Flag("rules.alert.for-outage-tolerance", "Max time to tolerate prometheus outage for restoring \"for\" state of alert.").
Default("1h").SetValue(&cfg.outageTolerance)
a.Flag("rules.alert.for-grace-period", "Minimum duration between alert and restored \"for\" state. This is maintained only for alerts with configured \"for\" time greater than grace period.").
Default("10m").SetValue(&cfg.forGracePeriod)
a.Flag("rules.alert.resend-delay", "Minimum amount of time to wait before resending an alert to Alertmanager.").
Default("1m").SetValue(&cfg.resendDelay)
a.Flag("scrape.adjust-timestamps", "Adjust scrape timestamps by up to 2ms to align them to the intended schedule. See https://github.com/adolli/prometheus/issues/7846 for more context. Experimental. This flag will be removed in a future release.").
Hidden().Default("true").BoolVar(&scrape.AlignScrapeTimestamps)
a.Flag("alertmanager.notification-queue-capacity", "The capacity of the queue for pending Alertmanager notifications.").
Default("10000").IntVar(&cfg.notifier.QueueCapacity)
// TODO: Remove in Prometheus 3.0.
alertmanagerTimeout := a.Flag("alertmanager.timeout", "[DEPRECATED] This flag has no effect.").Hidden().String()
a.Flag("query.lookback-delta", "The maximum lookback duration for retrieving metrics during expression evaluations and federation.").
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.queryConcurrency)
a.Flag("query.max-samples", "Maximum number of samples a single query can load into memory. Note that queries will fail if they try to load more samples than this into memory, so this also limits the number of samples a query can return.").
Default("50000000").IntVar(&cfg.queryMaxSamples)
a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: 'promql-at-modifier' to enable the @ modifier, 'remote-write-receiver' to enable remote write receiver, 'exemplar-storage' to enable the in-memory exemplar storage. See https://prometheus.io/docs/prometheus/latest/disabled_features/ for more details.").
Default("").StringsVar(&cfg.featureList)
promlogflag.AddFlags(a, &cfg.promlogConfig)
_, err := a.Parse(os.Args[1:])
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "Error parsing commandline arguments"))
a.Usage(os.Args[1:])
os.Exit(2)
}
logger := promlog.New(&cfg.promlogConfig)
if err := cfg.setFeatureListOptions(logger); err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "Error parsing feature list"))
os.Exit(1)
}
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.CORSOrigin, err = compileCORSRegexString(cfg.corsRegexString)
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrapf(err, "could not compile CORS regex string %q", cfg.corsRegexString))
os.Exit(2)
}
if *alertmanagerTimeout != "" {
level.Warn(logger).Log("msg", "The flag --alertmanager.timeout has no effect and will be removed in the future.")
}
// Throw error for invalid config before starting other components.
if _, err := config.LoadFile(cfg.configFile); err != nil {
level.Error(logger).Log("msg", fmt.Sprintf("Error loading config (--config.file=%s)", cfg.configFile), "err", err)
os.Exit(2)
}
// Now that the validity of the config is established, set the config
// success metrics accordingly, although the config isn't really loaded
// yet. This will happen later (including setting these metrics again),
// but if we don't do it now, the metrics will stay at zero until the
// startup procedure is complete, which might take long enough to
// trigger alerts about an invalid config.
configSuccess.Set(1)
configSuccessTime.SetToCurrentTime()
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, "/")
{ // Time retention settings.
if oldFlagRetentionDuration != 0 {
level.Warn(logger).Log("deprecation_notice", "'storage.tsdb.retention' flag is deprecated use 'storage.tsdb.retention.time' instead.")
cfg.tsdb.RetentionDuration = oldFlagRetentionDuration
}
// When the new flag is set it takes precedence.
if newFlagRetentionDuration != 0 {
cfg.tsdb.RetentionDuration = newFlagRetentionDuration
}
if cfg.tsdb.RetentionDuration == 0 && cfg.tsdb.MaxBytes == 0 {
cfg.tsdb.RetentionDuration = defaultRetentionDuration
level.Info(logger).Log("msg", "No time or size retention was set so using the default time retention", "duration", defaultRetentionDuration)
}
// Check for overflows. This limits our max retention to 100y.
if cfg.tsdb.RetentionDuration < 0 {
y, err := model.ParseDuration("100y")
if err != nil {
panic(err)
}
cfg.tsdb.RetentionDuration = y
level.Warn(logger).Log("msg", "Time retention value is too high. Limiting to: "+y.String())
}
}
{ // Max block size settings.
if cfg.tsdb.MaxBlockDuration == 0 {
maxBlockDuration, err := model.ParseDuration("31d")
if err != nil {
panic(err)
}
// When the time retention is set and not too big use to define the max block duration.
if cfg.tsdb.RetentionDuration != 0 && cfg.tsdb.RetentionDuration/10 < maxBlockDuration {
maxBlockDuration = cfg.tsdb.RetentionDuration / 10
}
cfg.tsdb.MaxBlockDuration = maxBlockDuration
}
}
noStepSubqueryInterval := &safePromQLNoStepSubqueryInterval{}
noStepSubqueryInterval.Set(config.DefaultGlobalConfig.EvaluationInterval)
// Above level 6, the k8s client would log bearer tokens in clear-text.
klog.ClampLevel(6)
klog.SetLogger(log.With(logger, "component", "k8s_client_runtime"))
klogv2.ClampLevel(6)
klogv2.SetLogger(log.With(logger, "component", "k8s_client_runtime"))
level.Info(logger).Log("msg", "Starting Prometheus", "version", version.Info())
if bits.UintSize < 64 {
level.Warn(logger).Log("msg", "This Prometheus binary has not been compiled for a 64-bit architecture. Due to virtual memory constraints of 32-bit systems, it is highly recommended to switch to a 64-bit binary of Prometheus.", "GOARCH", runtime.GOARCH)
}
level.Info(logger).Log("build_context", version.BuildContext())
level.Info(logger).Log("host_details", prom_runtime.Uname())
level.Info(logger).Log("fd_limits", prom_runtime.FdLimits())
level.Info(logger).Log("vm_limits", prom_runtime.VMLimits())
var (
localStorage = &readyStorage{}
scraper = &readyScrapeManager{}
remoteStorage = remote.NewStorage(log.With(logger, "component", "remote"), prometheus.DefaultRegisterer, localStorage.StartTime, cfg.localStoragePath, time.Duration(cfg.RemoteFlushDeadline), scraper)
fanoutStorage = storage.NewFanout(logger, localStorage, remoteStorage)
)
var (
ctxWeb, cancelWeb = context.WithCancel(context.Background())
ctxRule = context.Background()
notifierManager = notifier.NewManager(&cfg.notifier, log.With(logger, "component", "notifier"))
ctxScrape, cancelScrape = context.WithCancel(context.Background())
discoveryManagerScrape = discovery.NewManager(ctxScrape, log.With(logger, "component", "discovery manager scrape"), discovery.Name("scrape"))
ctxNotify, cancelNotify = context.WithCancel(context.Background())
discoveryManagerNotify = discovery.NewManager(ctxNotify, log.With(logger, "component", "discovery manager notify"), discovery.Name("notify"))
scrapeManager = scrape.NewManager(log.With(logger, "component", "scrape manager"), fanoutStorage)
opts = promql.EngineOpts{
Logger: log.With(logger, "component", "query engine"),
Reg: prometheus.DefaultRegisterer,
MaxSamples: cfg.queryMaxSamples,
Timeout: time.Duration(cfg.queryTimeout),
ActiveQueryTracker: promql.NewActiveQueryTracker(cfg.localStoragePath, cfg.queryConcurrency, log.With(logger, "component", "activeQueryTracker")),
LookbackDelta: time.Duration(cfg.lookbackDelta),
NoStepSubqueryIntervalFn: noStepSubqueryInterval.Get,
EnableAtModifier: cfg.enablePromQLAtModifier,
EnableNegativeOffset: cfg.enablePromQLNegativeOffset,
}
queryEngine = promql.NewEngine(opts)
ruleManager = rules.NewManager(&rules.ManagerOptions{
Appendable: fanoutStorage,
Queryable: localStorage,
QueryFunc: rules.EngineQueryFunc(queryEngine, fanoutStorage),
NotifyFunc: sendAlerts(notifierManager, cfg.web.ExternalURL.String()),
Context: ctxRule,
ExternalURL: cfg.web.ExternalURL,
Registerer: prometheus.DefaultRegisterer,
Logger: log.With(logger, "component", "rule manager"),
OutageTolerance: time.Duration(cfg.outageTolerance),
ForGracePeriod: time.Duration(cfg.forGracePeriod),
ResendDelay: time.Duration(cfg.resendDelay),
})
)
scraper.Set(scrapeManager)
cfg.web.Context = ctxWeb
cfg.web.TSDBRetentionDuration = cfg.tsdb.RetentionDuration
cfg.web.TSDBMaxBytes = cfg.tsdb.MaxBytes
cfg.web.TSDBDir = cfg.localStoragePath
cfg.web.LocalStorage = localStorage
cfg.web.Storage = fanoutStorage
cfg.web.ExemplarStorage = localStorage
cfg.web.QueryEngine = queryEngine
cfg.web.ScrapeManager = scrapeManager
cfg.web.RuleManager = ruleManager
cfg.web.Notifier = notifierManager
cfg.web.LookbackDelta = time.Duration(cfg.lookbackDelta)
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{}
// Exclude kingpin default flags to expose only Prometheus ones.
boilerplateFlags := kingpin.New("", "").Version("")
for _, f := range a.Model().Flags {
if boilerplateFlags.GetFlag(f.Name) != nil {
continue
}
cfg.web.Flags[f.Name] = f.Value.String()
}
// Depends on cfg.web.ScrapeManager so needs to be after cfg.web.ScrapeManager = scrapeManager.
webHandler := web.New(log.With(logger, "component", "web"), &cfg.web)
// Monitor outgoing connections on default transport with conntrack.
http.DefaultTransport.(*http.Transport).DialContext = conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
)
reloaders := []reloader{
{
name: "remote_storage",
reloader: remoteStorage.ApplyConfig,
}, {
name: "web_handler",
reloader: webHandler.ApplyConfig,
}, {
name: "query_engine",
reloader: func(cfg *config.Config) error {
if cfg.GlobalConfig.QueryLogFile == "" {
queryEngine.SetQueryLogger(nil)
return nil
}
l, err := logging.NewJSONFileLogger(cfg.GlobalConfig.QueryLogFile)
if err != nil {
return err
}
queryEngine.SetQueryLogger(l)
return nil
},
}, {
// The Scrape and notifier managers need to reload before the Discovery manager as
// they need to read the most updated config when receiving the new targets list.
name: "scrape",
reloader: scrapeManager.ApplyConfig,
}, {
name: "scrape_sd",
reloader: func(cfg *config.Config) error {
c := make(map[string]discovery.Configs)
for _, v := range cfg.ScrapeConfigs {
c[v.JobName] = v.ServiceDiscoveryConfigs
}
return discoveryManagerScrape.ApplyConfig(c)
},
}, {
name: "notify",
reloader: notifierManager.ApplyConfig,
}, {
name: "notify_sd",
reloader: func(cfg *config.Config) error {
c := make(map[string]discovery.Configs)
for k, v := range cfg.AlertingConfig.AlertmanagerConfigs.ToMap() {
c[k] = v.ServiceDiscoveryConfigs
}
return discoveryManagerNotify.ApplyConfig(c)
},
}, {
name: "rules",
reloader: func(cfg *config.Config) error {
// Get all rule files matching the configuration paths.
var files []string
for _, pat := range cfg.RuleFiles {
fs, err := filepath.Glob(pat)
if err != nil {
// The only error can be a bad pattern.
return errors.Wrapf(err, "error retrieving rule files for %s", pat)
}
files = append(files, fs...)
}
return ruleManager.Update(
time.Duration(cfg.GlobalConfig.EvaluationInterval),
files,
cfg.GlobalConfig.ExternalLabels,
)
},
},
}
prometheus.MustRegister(configSuccess)
prometheus.MustRegister(configSuccessTime)
// 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{})
// sync.Once is used to make sure we can close the channel at different execution stages(SIGTERM or when the config is loaded).
type closeOnce struct {
C chan struct{}
once sync.Once
Close func()
}
// Wait until the server is ready to handle reloading.
reloadReady := &closeOnce{
C: make(chan struct{}),
}
reloadReady.Close = func() {
reloadReady.once.Do(func() {
close(reloadReady.C)
})
}
closer, err := initTracing(logger)
if err != nil {
level.Error(logger).Log("msg", "Unable to init tracing", "err", err)
os.Exit(2)
}
defer closer.Close()
listener, err := webHandler.Listener()
if err != nil {
level.Error(logger).Log("msg", "Unable to start web listener", "err", err)
os.Exit(1)
}
err = toolkit_web.Validate(*webConfig)
if err != nil {
level.Error(logger).Log("msg", "Unable to validate web configuration file", "err", err)
os.Exit(1)
}
var g run.Group
{
// Termination handler.
term := make(chan os.Signal, 1)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
cancel := make(chan struct{})
g.Add(
func() error {
// Don't forget to release the reloadReady channel so that waiting blocks can exit normally.
select {
case <-term:
level.Warn(logger).Log("msg", "Received SIGTERM, exiting gracefully...")
reloadReady.Close()
case <-webHandler.Quit():
level.Warn(logger).Log("msg", "Received termination request via web service, exiting gracefully...")
case <-cancel:
reloadReady.Close()
}
return nil
},
func(err error) {
close(cancel)
},
)
}
{
// Scrape discovery manager.
g.Add(
func() error {
err := discoveryManagerScrape.Run()
level.Info(logger).Log("msg", "Scrape discovery manager stopped")
return err
},
func(err error) {
level.Info(logger).Log("msg", "Stopping scrape discovery manager...")
cancelScrape()
},
)
}
{
// Notify discovery manager.
g.Add(
func() error {
err := discoveryManagerNotify.Run()
level.Info(logger).Log("msg", "Notify discovery manager stopped")
return err
},
func(err error) {
level.Info(logger).Log("msg", "Stopping notify discovery manager...")
cancelNotify()
},
)
}
{
// Scrape manager.
g.Add(
func() error {
// When the scrape manager receives a new targets list
// it needs to read a valid config for each job.
// It depends on the config being in sync with the discovery manager so
// we wait until the config is fully loaded.
<-reloadReady.C
err := scrapeManager.Run(discoveryManagerScrape.SyncCh())
level.Info(logger).Log("msg", "Scrape manager stopped")
return err
},
func(err error) {
// Scrape manager needs to be stopped before closing the local TSDB
// so that it doesn't try to write samples to a closed storage.
level.Info(logger).Log("msg", "Stopping scrape manager...")
scrapeManager.Stop()
},
)
}
{
// Reload handler.
// 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, 1)
signal.Notify(hup, syscall.SIGHUP)
cancel := make(chan struct{})
g.Add(
func() error {
<-reloadReady.C
for {
select {
case <-hup:
if err := reloadConfig(cfg.configFile, logger, noStepSubqueryInterval, reloaders...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
}
case rc := <-webHandler.Reload():
if err := reloadConfig(cfg.configFile, logger, noStepSubqueryInterval, reloaders...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
rc <- err
} else {
rc <- nil
}
case <-cancel:
return nil
}
}
},
func(err error) {
// Wait for any in-progress reloads to complete to avoid
// reloading things after they have been shutdown.
cancel <- struct{}{}
},
)
}
{
// Initial configuration loading.
cancel := make(chan struct{})
g.Add(
func() error {
select {
case <-dbOpen:
// In case a shutdown is initiated before the dbOpen is released
case <-cancel:
reloadReady.Close()
return nil
}
if err := reloadConfig(cfg.configFile, logger, noStepSubqueryInterval, reloaders...); err != nil {
return errors.Wrapf(err, "error loading config from %q", cfg.configFile)
}
reloadReady.Close()
webHandler.Ready()
level.Info(logger).Log("msg", "Server is ready to receive web requests.")
<-cancel
return nil
},
func(err error) {
close(cancel)
},
)
}
{
// Rule manager.
g.Add(
func() error {
<-reloadReady.C
ruleManager.Run()
return nil
},
func(err error) {
ruleManager.Stop()
},
)
}
{
// TSDB.
opts := cfg.tsdb.ToTSDBOptions()
cancel := make(chan struct{})
g.Add(
func() error {
level.Info(logger).Log("msg", "Starting TSDB ...")
if cfg.tsdb.WALSegmentSize != 0 {
if cfg.tsdb.WALSegmentSize < 10*1024*1024 || cfg.tsdb.WALSegmentSize > 256*1024*1024 {
return errors.New("flag 'storage.tsdb.wal-segment-size' must be set between 10MB and 256MB")
}
}
db, err := openDBWithMetrics(
cfg.localStoragePath,
logger,
prometheus.DefaultRegisterer,
&opts,
)
if err != nil {
return errors.Wrapf(err, "opening storage failed")
}
switch fsType := prom_runtime.Statfs(cfg.localStoragePath); fsType {
case "NFS_SUPER_MAGIC":
level.Warn(logger).Log("fs_type", fsType, "msg", "This filesystem is not supported and may lead to data corruption and data loss. Please carefully read https://prometheus.io/docs/prometheus/latest/storage/ to learn more about supported filesystems.")
default:
level.Info(logger).Log("fs_type", fsType)
}
level.Info(logger).Log("msg", "TSDB started")
level.Debug(logger).Log("msg", "TSDB options",
"MinBlockDuration", cfg.tsdb.MinBlockDuration,
"MaxBlockDuration", cfg.tsdb.MaxBlockDuration,
"MaxBytes", cfg.tsdb.MaxBytes,
"NoLockfile", cfg.tsdb.NoLockfile,
"RetentionDuration", cfg.tsdb.RetentionDuration,
"WALSegmentSize", cfg.tsdb.WALSegmentSize,
"AllowOverlappingBlocks", cfg.tsdb.AllowOverlappingBlocks,
"WALCompression", cfg.tsdb.WALCompression,
)
startTimeMargin := int64(2 * time.Duration(cfg.tsdb.MinBlockDuration).Seconds() * 1000)
localStorage.Set(db, startTimeMargin)
close(dbOpen)
<-cancel
return nil
},
func(err error) {
if err := fanoutStorage.Close(); err != nil {
level.Error(logger).Log("msg", "Error stopping storage", "err", err)
}
close(cancel)
},
)
}
{
// Web handler.
g.Add(
func() error {
if err := webHandler.Run(ctxWeb, listener, *webConfig); err != nil {
return errors.Wrapf(err, "error starting web server")
}
return nil
},
func(err error) {
cancelWeb()
},
)
}
{
// Notifier.
// Calling notifier.Stop() before ruleManager.Stop() will cause a panic if the ruleManager isn't running,
// so keep this interrupt after the ruleManager.Stop().
g.Add(
func() error {
// When the notifier manager receives a new targets list
// it needs to read a valid config for each job.
// It depends on the config being in sync with the discovery manager
// so we wait until the config is fully loaded.
<-reloadReady.C
notifierManager.Run(discoveryManagerNotify.SyncCh())
level.Info(logger).Log("msg", "Notifier manager stopped")
return nil
},
func(err error) {
notifierManager.Stop()
},
)
}
if err := g.Run(); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
level.Info(logger).Log("msg", "See you next time!")
}
func openDBWithMetrics(dir string, logger log.Logger, reg prometheus.Registerer, opts *tsdb.Options) (*tsdb.DB, error) {
db, err := tsdb.Open(
dir,
log.With(logger, "component", "tsdb"),
reg,
opts,
)
if err != nil {
return nil, err
}
reg.MustRegister(
prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_lowest_timestamp_seconds",
Help: "Lowest timestamp value stored in the database.",
}, func() float64 {
bb := db.Blocks()
if len(bb) == 0 {
return float64(db.Head().MinTime() / 1000)
}
return float64(db.Blocks()[0].Meta().MinTime / 1000)
}), prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_head_min_time_seconds",
Help: "Minimum time bound of the head block.",
}, func() float64 { return float64(db.Head().MinTime() / 1000) }),
prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_head_max_time_seconds",
Help: "Maximum timestamp of the head block.",
}, func() float64 { return float64(db.Head().MaxTime() / 1000) }),
)
return db, nil
}
type safePromQLNoStepSubqueryInterval struct {
value atomic.Int64
}
func durationToInt64Millis(d time.Duration) int64 {
return int64(d / time.Millisecond)
}
func (i *safePromQLNoStepSubqueryInterval) Set(ev model.Duration) {
i.value.Store(durationToInt64Millis(time.Duration(ev)))
}
func (i *safePromQLNoStepSubqueryInterval) Get(int64) int64 {
return i.value.Load()
}
type reloader struct {
name string
reloader func(*config.Config) error
}
func reloadConfig(filename string, logger log.Logger, noStepSuqueryInterval *safePromQLNoStepSubqueryInterval, rls ...reloader) (err error) {
start := time.Now()
timings := []interface{}{}
level.Info(logger).Log("msg", "Loading configuration file", "filename", filename)
defer func() {
if err == nil {
configSuccess.Set(1)
configSuccessTime.SetToCurrentTime()
} else {
configSuccess.Set(0)
}
}()
conf, err := config.LoadFile(filename)
if err != nil {
return errors.Wrapf(err, "couldn't load configuration (--config.file=%q)", filename)
}
failed := false
for _, rl := range rls {
rstart := time.Now()
if err := rl.reloader(conf); err != nil {
level.Error(logger).Log("msg", "Failed to apply configuration", "err", err)
failed = true
}
timings = append(timings, rl.name, time.Since(rstart))
}
if failed {
return errors.Errorf("one or more errors occurred while applying the new configuration (--config.file=%q)", filename)
}
noStepSuqueryInterval.Set(conf.GlobalConfig.EvaluationInterval)
l := []interface{}{"msg", "Completed loading of configuration file", "filename", filename, "totalDuration", time.Since(start)}
level.Info(logger).Log(append(l, timings...)...)
return nil
}
func startsOrEndsWithQuote(s string) bool {
return strings.HasPrefix(s, "\"") || strings.HasPrefix(s, "'") ||
strings.HasSuffix(s, "\"") || strings.HasSuffix(s, "'")
}
// compileCORSRegexString compiles given string and adds anchors
func compileCORSRegexString(s string) (*regexp.Regexp, error) {
r, err := relabel.NewRegexp(s)
if err != nil {
return nil, err
}
return r.Regexp, 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
}