forked from TrueCloudLab/distribution
Add debug server to support pprof and expvar
If configured, a debug http server will be started to serve default registered endpoints, such as pprof and expvar. The endpoint should be secured carefully and not available to external traffic. It is disabled by default but the development config has been modified to make it available on localhost. Signed-off-by: Stephen J Day <stephen.day@docker.com>
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3 changed files with 26 additions and 0 deletions
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@ -5,3 +5,6 @@ storage:
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rootdirectory: /tmp/registry-dev
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rootdirectory: /tmp/registry-dev
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http:
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http:
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addr: :5000
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addr: :5000
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secret: asecretforlocaldevelopment
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debug:
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addr: localhost:5001
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@ -1,6 +1,7 @@
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package main
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package main
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import (
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import (
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_ "expvar"
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"flag"
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"flag"
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"fmt"
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"fmt"
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"net/http"
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"net/http"
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@ -47,6 +48,10 @@ func main() {
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handler = handlers.CombinedLoggingHandler(os.Stdout, handler)
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handler = handlers.CombinedLoggingHandler(os.Stdout, handler)
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log.SetLevel(logLevel(config.Loglevel))
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log.SetLevel(logLevel(config.Loglevel))
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if config.HTTP.Debug.Addr != "" {
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go debugServer(config.HTTP.Debug.Addr)
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}
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if config.HTTP.TLS.Certificate == "" {
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if config.HTTP.TLS.Certificate == "" {
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log.Infof("listening on %v", config.HTTP.Addr)
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log.Infof("listening on %v", config.HTTP.Addr)
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if err := http.ListenAndServe(config.HTTP.Addr, handler); err != nil {
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if err := http.ListenAndServe(config.HTTP.Addr, handler); err != nil {
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@ -142,3 +147,13 @@ func configureReporting(app *registry.App) http.Handler {
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return handler
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return handler
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}
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}
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// debugServer starts the debug server with pprof, expvar among other
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// endpoints. The addr should not be exposed externally. For most of these to
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// work, tls cannot be enabled on the endpoint, so it is generally separate.
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func debugServer(addr string) {
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log.Infof("debug server listening %v", addr)
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if err := http.ListenAndServe(addr, nil); err != nil {
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log.Fatalf("error listening on debug interface: %v", err)
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}
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}
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@ -54,6 +54,14 @@ type Configuration struct {
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// Certificate.
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// Certificate.
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Key string `yaml:"key"`
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Key string `yaml:"key"`
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} `yaml:"tls"`
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} `yaml:"tls"`
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// Debug configures the http debug interface, if specified. This can
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// include services such as pprof, expvar and other data that should
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// not be exposed externally. Left disabled by default.
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Debug struct {
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// Addr specifies the bind address for the debug server.
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Addr string `yaml:"addr"`
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} `yaml:"debug"`
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} `yaml:"http"`
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} `yaml:"http"`
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}
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}
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