Merge pull request #14769 from roidelapluie/autoreload
Support reload config automatically
This commit is contained in:
Julien
GitHub
commit
50f5327f83
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@ -154,6 +154,9 @@ type flagConfig struct {
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RemoteFlushDeadline model.Duration
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nameEscapingScheme string
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enableAutoReload bool
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autoReloadInterval model.Duration
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featureList []string
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memlimitRatio float64
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// These options are extracted from featureList
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@ -212,6 +215,12 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
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case "auto-gomaxprocs":
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c.enableAutoGOMAXPROCS = true
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level.Info(logger).Log("msg", "Automatically set GOMAXPROCS to match Linux container CPU quota")
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case "auto-reload-config":
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c.enableAutoReload = true
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if s := time.Duration(c.autoReloadInterval).Seconds(); s > 0 && s < 1 {
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c.autoReloadInterval, _ = model.ParseDuration("1s")
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}
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level.Info(logger).Log("msg", fmt.Sprintf("Enabled automatic configuration file reloading. Checking for configuration changes every %s.", c.autoReloadInterval))
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case "auto-gomemlimit":
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c.enableAutoGOMEMLIMIT = true
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level.Info(logger).Log("msg", "Automatically set GOMEMLIMIT to match Linux container or system memory limit")
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@ -302,6 +311,9 @@ func main() {
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a.Flag("config.file", "Prometheus configuration file path.").
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Default("prometheus.yml").StringVar(&cfg.configFile)
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a.Flag("config.auto-reload-interval", "Specifies the interval for checking and automatically reloading the Prometheus configuration file upon detecting changes.").
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Default("30s").SetValue(&cfg.autoReloadInterval)
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a.Flag("web.listen-address", "Address to listen on for UI, API, and telemetry. Can be repeated.").
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Default("0.0.0.0:9090").StringsVar(&cfg.web.ListenAddresses)
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@ -492,7 +504,7 @@ func main() {
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a.Flag("scrape.name-escaping-scheme", `Method for escaping legacy invalid names when sending to Prometheus that does not support UTF-8. Can be one of "values", "underscores", or "dots".`).Default(scrape.DefaultNameEscapingScheme.String()).StringVar(&cfg.nameEscapingScheme)
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a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: agent, auto-gomaxprocs, auto-gomemlimit, concurrent-rule-eval, created-timestamp-zero-ingestion, delayed-compaction, exemplar-storage, expand-external-labels, extra-scrape-metrics, memory-snapshot-on-shutdown, native-histograms, new-service-discovery-manager, no-default-scrape-port, otlp-write-receiver, promql-experimental-functions, promql-delayed-name-removal, promql-per-step-stats, remote-write-receiver (DEPRECATED), utf8-names. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
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a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: agent, auto-gomaxprocs, auto-gomemlimit, auto-reload-config, concurrent-rule-eval, created-timestamp-zero-ingestion, delayed-compaction, exemplar-storage, expand-external-labels, extra-scrape-metrics, memory-snapshot-on-shutdown, native-histograms, new-service-discovery-manager, no-default-scrape-port, otlp-write-receiver, promql-experimental-functions, promql-delayed-name-removal, promql-per-step-stats, remote-write-receiver (DEPRECATED), utf8-names. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
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Default("").StringsVar(&cfg.featureList)
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promlogflag.AddFlags(a, &cfg.promlogConfig)
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@ -1129,6 +1141,15 @@ func main() {
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hup := make(chan os.Signal, 1)
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signal.Notify(hup, syscall.SIGHUP)
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cancel := make(chan struct{})
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var checksum string
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if cfg.enableAutoReload {
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checksum, err = config.GenerateChecksum(cfg.configFile)
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if err != nil {
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level.Error(logger).Log("msg", "Failed to generate initial checksum for configuration file", "err", err)
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}
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}
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g.Add(
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func() error {
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<-reloadReady.C
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@ -1138,6 +1159,12 @@ func main() {
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case <-hup:
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if err := reloadConfig(cfg.configFile, cfg.enableExpandExternalLabels, cfg.tsdb.EnableExemplarStorage, logger, noStepSubqueryInterval, reloaders...); err != nil {
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level.Error(logger).Log("msg", "Error reloading config", "err", err)
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} else if cfg.enableAutoReload {
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if currentChecksum, err := config.GenerateChecksum(cfg.configFile); err == nil {
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checksum = currentChecksum
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} else {
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level.Error(logger).Log("msg", "Failed to generate checksum during configuration reload", "err", err)
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}
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}
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case rc := <-webHandler.Reload():
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if err := reloadConfig(cfg.configFile, cfg.enableExpandExternalLabels, cfg.tsdb.EnableExemplarStorage, logger, noStepSubqueryInterval, reloaders...); err != nil {
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@ -1145,6 +1172,32 @@ func main() {
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rc <- err
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} else {
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rc <- nil
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if cfg.enableAutoReload {
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if currentChecksum, err := config.GenerateChecksum(cfg.configFile); err == nil {
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checksum = currentChecksum
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} else {
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level.Error(logger).Log("msg", "Failed to generate checksum during configuration reload", "err", err)
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}
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}
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}
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case <-time.Tick(time.Duration(cfg.autoReloadInterval)):
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if !cfg.enableAutoReload {
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continue
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}
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currentChecksum, err := config.GenerateChecksum(cfg.configFile)
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if err != nil {
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level.Error(logger).Log("msg", "Failed to generate checksum during configuration reload", "err", err)
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continue
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}
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if currentChecksum == checksum {
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continue
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}
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level.Info(logger).Log("msg", "Configuration file change detected, reloading the configuration.")
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if err := reloadConfig(cfg.configFile, cfg.enableExpandExternalLabels, cfg.tsdb.EnableExemplarStorage, logger, noStepSubqueryInterval, reloaders...); err != nil {
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level.Error(logger).Log("msg", "Error reloading config", "err", err)
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} else {
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checksum = currentChecksum
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}
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case <-cancel:
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return nil
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@ -0,0 +1,92 @@
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// Copyright 2024 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package config
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"os"
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"path/filepath"
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"gopkg.in/yaml.v2"
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)
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type ExternalFilesConfig struct {
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RuleFiles []string `yaml:"rule_files"`
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ScrapeConfigFiles []string `yaml:"scrape_config_files"`
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}
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// GenerateChecksum generates a checksum of the YAML file and the files it references.
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func GenerateChecksum(yamlFilePath string) (string, error) {
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hash := sha256.New()
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yamlContent, err := os.ReadFile(yamlFilePath)
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if err != nil {
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return "", fmt.Errorf("error reading YAML file: %w", err)
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}
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_, err = hash.Write(yamlContent)
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if err != nil {
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return "", fmt.Errorf("error writing YAML file to hash: %w", err)
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}
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var config ExternalFilesConfig
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if err := yaml.Unmarshal(yamlContent, &config); err != nil {
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return "", fmt.Errorf("error unmarshalling YAML: %w", err)
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}
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dir := filepath.Dir(yamlFilePath)
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for i, file := range config.RuleFiles {
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config.RuleFiles[i] = filepath.Join(dir, file)
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}
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for i, file := range config.ScrapeConfigFiles {
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config.ScrapeConfigFiles[i] = filepath.Join(dir, file)
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}
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files := map[string][]string{
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"r": config.RuleFiles, // "r" for rule files
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"s": config.ScrapeConfigFiles, // "s" for scrape config files
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}
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for _, prefix := range []string{"r", "s"} {
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for _, pattern := range files[prefix] {
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matchingFiles, err := filepath.Glob(pattern)
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if err != nil {
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return "", fmt.Errorf("error finding files with pattern %q: %w", pattern, err)
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}
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for _, file := range matchingFiles {
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// Write prefix to the hash ("r" or "s") followed by \0, then
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// the file path.
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_, err = hash.Write([]byte(prefix + "\x00" + file + "\x00"))
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if err != nil {
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return "", fmt.Errorf("error writing %q path to hash: %w", file, err)
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}
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// Read and hash the content of the file.
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content, err := os.ReadFile(file)
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if err != nil {
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return "", fmt.Errorf("error reading file %s: %w", file, err)
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}
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_, err = hash.Write(append(content, []byte("\x00")...))
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if err != nil {
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return "", fmt.Errorf("error writing %q content to hash: %w", file, err)
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}
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}
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}
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}
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return hex.EncodeToString(hash.Sum(nil)), nil
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}
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@ -0,0 +1,222 @@
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// Copyright 2024 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package config
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import (
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"os"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestGenerateChecksum(t *testing.T) {
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tmpDir := t.TempDir()
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// Define paths for the temporary files.
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yamlFilePath := filepath.Join(tmpDir, "test.yml")
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ruleFilePath := filepath.Join(tmpDir, "rule_file.yml")
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scrapeConfigFilePath := filepath.Join(tmpDir, "scrape_config.yml")
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// Define initial and modified content for the files.
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originalRuleContent := "groups:\n- name: example\n rules:\n - alert: ExampleAlert"
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modifiedRuleContent := "groups:\n- name: example\n rules:\n - alert: ModifiedAlert"
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originalScrapeConfigContent := "scrape_configs:\n- job_name: example"
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modifiedScrapeConfigContent := "scrape_configs:\n- job_name: modified_example"
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// Define YAML content referencing the rule and scrape config files.
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yamlContent := `
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rule_files:
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- rule_file.yml
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scrape_config_files:
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- scrape_config.yml
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`
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// Write initial content to files.
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require.NoError(t, os.WriteFile(ruleFilePath, []byte(originalRuleContent), 0o644))
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require.NoError(t, os.WriteFile(scrapeConfigFilePath, []byte(originalScrapeConfigContent), 0o644))
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(yamlContent), 0o644))
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// Generate the original checksum.
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originalChecksum := calculateChecksum(t, yamlFilePath)
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t.Run("Rule File Change", func(t *testing.T) {
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// Modify the rule file.
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require.NoError(t, os.WriteFile(ruleFilePath, []byte(modifiedRuleContent), 0o644))
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// Checksum should change.
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modifiedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, modifiedChecksum)
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// Revert the rule file.
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require.NoError(t, os.WriteFile(ruleFilePath, []byte(originalRuleContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Scrape Config Change", func(t *testing.T) {
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// Modify the scrape config file.
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require.NoError(t, os.WriteFile(scrapeConfigFilePath, []byte(modifiedScrapeConfigContent), 0o644))
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// Checksum should change.
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modifiedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, modifiedChecksum)
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// Revert the scrape config file.
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require.NoError(t, os.WriteFile(scrapeConfigFilePath, []byte(originalScrapeConfigContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Rule File Deletion", func(t *testing.T) {
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// Delete the rule file.
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require.NoError(t, os.Remove(ruleFilePath))
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// Checksum should change.
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deletedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, deletedChecksum)
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// Restore the rule file.
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require.NoError(t, os.WriteFile(ruleFilePath, []byte(originalRuleContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Scrape Config Deletion", func(t *testing.T) {
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// Delete the scrape config file.
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require.NoError(t, os.Remove(scrapeConfigFilePath))
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// Checksum should change.
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deletedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, deletedChecksum)
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// Restore the scrape config file.
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require.NoError(t, os.WriteFile(scrapeConfigFilePath, []byte(originalScrapeConfigContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Main File Change", func(t *testing.T) {
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// Modify the main YAML file.
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modifiedYamlContent := `
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global:
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scrape_interval: 3s
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rule_files:
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- rule_file.yml
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scrape_config_files:
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- scrape_config.yml
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`
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(modifiedYamlContent), 0o644))
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// Checksum should change.
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modifiedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, modifiedChecksum)
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// Revert the main YAML file.
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(yamlContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Rule File Removed from YAML Config", func(t *testing.T) {
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// Modify the YAML content to remove the rule file.
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modifiedYamlContent := `
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scrape_config_files:
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- scrape_config.yml
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`
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(modifiedYamlContent), 0o644))
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// Checksum should change.
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modifiedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, modifiedChecksum)
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// Revert the YAML content.
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(yamlContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Scrape Config Removed from YAML Config", func(t *testing.T) {
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// Modify the YAML content to remove the scrape config file.
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modifiedYamlContent := `
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rule_files:
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- rule_file.yml
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`
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(modifiedYamlContent), 0o644))
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// Checksum should change.
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modifiedChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, modifiedChecksum)
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// Revert the YAML content.
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require.NoError(t, os.WriteFile(yamlFilePath, []byte(yamlContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Empty Rule File", func(t *testing.T) {
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// Write an empty rule file.
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require.NoError(t, os.WriteFile(ruleFilePath, []byte(""), 0o644))
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// Checksum should change.
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emptyChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, emptyChecksum)
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// Restore the rule file.
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require.NoError(t, os.WriteFile(ruleFilePath, []byte(originalRuleContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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t.Run("Empty Scrape Config File", func(t *testing.T) {
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// Write an empty scrape config file.
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require.NoError(t, os.WriteFile(scrapeConfigFilePath, []byte(""), 0o644))
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// Checksum should change.
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emptyChecksum := calculateChecksum(t, yamlFilePath)
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require.NotEqual(t, originalChecksum, emptyChecksum)
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|
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// Restore the scrape config file.
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require.NoError(t, os.WriteFile(scrapeConfigFilePath, []byte(originalScrapeConfigContent), 0o644))
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// Checksum should return to the original.
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revertedChecksum := calculateChecksum(t, yamlFilePath)
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require.Equal(t, originalChecksum, revertedChecksum)
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})
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}
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// calculateChecksum generates a checksum for the given YAML file path.
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func calculateChecksum(t *testing.T, yamlFilePath string) string {
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checksum, err := GenerateChecksum(yamlFilePath)
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require.NoError(t, err)
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require.NotEmpty(t, checksum)
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return checksum
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}
|
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|
|
@ -15,6 +15,7 @@ The Prometheus monitoring server
|
|||
| <code class="text-nowrap">-h</code>, <code class="text-nowrap">--help</code> | Show context-sensitive help (also try --help-long and --help-man). | |
|
||||
| <code class="text-nowrap">--version</code> | Show application version. | |
|
||||
| <code class="text-nowrap">--config.file</code> | Prometheus configuration file path. | `prometheus.yml` |
|
||||
| <code class="text-nowrap">--config.auto-reload-interval</code> | Specifies the interval for checking and automatically reloading the Prometheus configuration file upon detecting changes. | `30s` |
|
||||
| <code class="text-nowrap">--web.listen-address</code> <code class="text-nowrap">...<code class="text-nowrap"> | Address to listen on for UI, API, and telemetry. Can be repeated. | `0.0.0.0:9090` |
|
||||
| <code class="text-nowrap">--auto-gomemlimit.ratio</code> | The ratio of reserved GOMEMLIMIT memory to the detected maximum container or system memory | `0.9` |
|
||||
| <code class="text-nowrap">--web.config.file</code> | [EXPERIMENTAL] Path to configuration file that can enable TLS or authentication. | |
|
||||
|
|
@ -57,7 +58,7 @@ The Prometheus monitoring server
|
|||
| <code class="text-nowrap">--query.max-concurrency</code> | Maximum number of queries executed concurrently. Use with server mode only. | `20` |
|
||||
| <code class="text-nowrap">--query.max-samples</code> | 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. Use with server mode only. | `50000000` |
|
||||
| <code class="text-nowrap">--scrape.name-escaping-scheme</code> | Method for escaping legacy invalid names when sending to Prometheus that does not support UTF-8. Can be one of "values", "underscores", or "dots". | `values` |
|
||||
| <code class="text-nowrap">--enable-feature</code> <code class="text-nowrap">...<code class="text-nowrap"> | Comma separated feature names to enable. Valid options: agent, auto-gomaxprocs, auto-gomemlimit, concurrent-rule-eval, created-timestamp-zero-ingestion, delayed-compaction, exemplar-storage, expand-external-labels, extra-scrape-metrics, memory-snapshot-on-shutdown, native-histograms, new-service-discovery-manager, no-default-scrape-port, otlp-write-receiver, promql-experimental-functions, promql-delayed-name-removal, promql-per-step-stats, remote-write-receiver (DEPRECATED), utf8-names. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details. | |
|
||||
| <code class="text-nowrap">--enable-feature</code> <code class="text-nowrap">...<code class="text-nowrap"> | Comma separated feature names to enable. Valid options: agent, auto-gomaxprocs, auto-gomemlimit, auto-reload-config, concurrent-rule-eval, created-timestamp-zero-ingestion, delayed-compaction, exemplar-storage, expand-external-labels, extra-scrape-metrics, memory-snapshot-on-shutdown, native-histograms, new-service-discovery-manager, no-default-scrape-port, otlp-write-receiver, promql-experimental-functions, promql-delayed-name-removal, promql-per-step-stats, remote-write-receiver (DEPRECATED), utf8-names. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details. | |
|
||||
| <code class="text-nowrap">--log.level</code> | Only log messages with the given severity or above. One of: [debug, info, warn, error] | `info` |
|
||||
| <code class="text-nowrap">--log.format</code> | Output format of log messages. One of: [logfmt, json] | `logfmt` |
|
||||
|
||||
|
|
|
|||
|
|
@ -265,3 +265,15 @@ This allows optionally preserving the `__name__` label via the `label_replace` a
|
|||
When enabled, changes the metric and label name validation scheme inside Prometheus to allow the full UTF-8 character set.
|
||||
By itself, this flag does not enable the request of UTF-8 names via content negotiation.
|
||||
Users will also have to set `metric_name_validation_scheme` in scrape configs to enable the feature either on the global config or on a per-scrape config basis.
|
||||
|
||||
## Auto Reload Config
|
||||
|
||||
`--enable-feature=auto-reload-config`
|
||||
|
||||
When enabled, Prometheus will automatically reload its configuration file at a
|
||||
specified interval. The interval is defined by the
|
||||
`--config.auto-reload-interval` flag, which defaults to `30s`.
|
||||
|
||||
Configuration reloads are triggered by detecting changes in the checksum of the
|
||||
main configuration file or any referenced files, such as rule and scrape
|
||||
configurations.
|
||||
|
|
|
|||
Loading…
Reference in New Issue