github.com/demonoid81/moby@v0.0.0-20200517203328-62dd8e17c460/cmd/dockerd/metrics.go (about) 1 package main 2 3 import ( 4 "net" 5 "net/http" 6 "strings" 7 8 metrics "github.com/docker/go-metrics" 9 "github.com/sirupsen/logrus" 10 ) 11 12 func startMetricsServer(addr string) error { 13 if addr == "" { 14 return nil 15 } 16 if err := allocateDaemonPort(addr); err != nil { 17 return err 18 } 19 l, err := net.Listen("tcp", addr) 20 if err != nil { 21 return err 22 } 23 mux := http.NewServeMux() 24 mux.Handle("/metrics", metrics.Handler()) 25 go func() { 26 logrus.Infof("metrics API listening on %s", l.Addr()) 27 if err := http.Serve(l, mux); err != nil && !strings.Contains(err.Error(), "use of closed network connection") { 28 logrus.WithError(err).Error("error serving metrics API") 29 } 30 }() 31 return nil 32 }