diff --git a/.gitignore b/.gitignore
index cf9de60..5bd4d61 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 *.so
 *.dylib
 cmd/diagnosis/diagnosis
+cmd/diagnosis/diagnosis.*
 
 # Test binary, build with `go test -c`
 *.test
diff --git a/cmd/diagnosis/main.go b/cmd/diagnosis/main.go
index 4d0dad2..fb24468 100644
--- a/cmd/diagnosis/main.go
+++ b/cmd/diagnosis/main.go
@@ -1,16 +1,17 @@
 package main
 
 import (
+	"flag"
 	"fmt"
-	"log"
 	"net/http"
 
+	"github.com/golang/glog"
 	"github.com/wangyoucao577/go-project-layout/diagnosis"
 )
 
 func main() {
-	//log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Llongfile)
-	log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Lshortfile)
+	flag.Parse() // parse flags for glog
+	defer glog.Flush()
 
 	mux := http.NewServeMux()
 
@@ -29,5 +30,6 @@ func main() {
 		fmt.Fprintf(w, "no diagnosis command %s", req.URL)
 	})
 
-	log.Fatal(http.ListenAndServe(":8000", mux))
+	glog.Info("Listen on :8000")
+	glog.Fatal(http.ListenAndServe(":8000", mux))
 }
diff --git a/diagnosis/fetching.go b/diagnosis/fetching.go
index b2763f1..7bee04b 100644
--- a/diagnosis/fetching.go
+++ b/diagnosis/fetching.go
@@ -1,10 +1,10 @@
 package diagnosis
 
 import (
-	"log"
 	"net"
 	"os"
 
+	"github.com/golang/glog"
 	"github.com/matishsiao/goInfo"
 )
 
@@ -15,37 +15,37 @@ func New() *Info {
 	//hostname
 	hostname, err := os.Hostname()
 	if err != nil {
-		log.Printf("get hostname failed, err %v\n", err)
+		glog.Warningf("get hostname failed, err %v\n", err)
 	} else {
-		log.Printf("Hostname: %s\n", hostname)
+		glog.V(2).Infof("Hostname: %s\n", hostname)
 		info.Hostname = hostname
 	}
 
 	//ip addresses
 	addrs, err := net.InterfaceAddrs()
 	if err != nil {
-		log.Printf("lookup network interface addrs failed, err %v\n", err)
+		glog.Warningf("lookup network interface addrs failed, err %v\n", err)
 	} else {
 		for _, addr := range addrs {
 			ip, _, err := net.ParseCIDR(addr.String())
 			if err != nil {
-				log.Printf("ParseCIDR addrs failed, err %v\n", err)
+				glog.Warningf("ParseCIDR addrs failed, err %v\n", err)
 				continue
 			}
 
 			if ip.IsLoopback() {
-				log.Printf("ignore Loopback ip address-->%s\n", addr.String())
+				glog.V(2).Infof("ignore Loopback ip address-->%s\n", addr.String())
 				continue
 			}
 
-			log.Printf("%s ip address-->%s\n", addr.Network(), addr.String())
+			glog.V(2).Infof("%s ip address-->%s\n", addr.Network(), addr.String())
 			info.IPAddresses = append(info.IPAddresses, addr.String())
 		}
 	}
 
 	//from goInfo
 	gi := goInfo.GetInfo()
-	log.Println(gi)
+	glog.V(2).Infoln(gi)
 	info.CPUs = gi.CPUs
 
 	return &info
diff --git a/diagnosis/info.go b/diagnosis/info.go
index 81c50ec..b0ea6b3 100644
--- a/diagnosis/info.go
+++ b/diagnosis/info.go
@@ -2,7 +2,8 @@ package diagnosis
 
 import (
 	"encoding/json"
-	"log"
+
+	"github.com/golang/glog"
 )
 
 // Info includes information for diagnosis.
@@ -19,7 +20,7 @@ type Info struct {
 func (info Info) String() string {
 	jsonstr, err := json.Marshal(info)
 	if err != nil {
-		log.Fatalf("to json failed, err %v\n", err)
+		glog.Errorf("to json failed, err %v\n", err)
 		return err.Error()
 	}
 	return string(jsonstr)
diff --git a/go.mod b/go.mod
index 8328705..0aea4a6 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,7 @@ module github.com/wangyoucao577/go-project-layout
 
 go 1.13
 
-require github.com/matishsiao/goInfo v0.0.0-20170803142006-617e6440957e
+require (
+	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/matishsiao/goInfo v0.0.0-20170803142006-617e6440957e
+)
diff --git a/go.sum b/go.sum
index 01bfd9b..308f6b6 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,4 @@
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/matishsiao/goInfo v0.0.0-20170803142006-617e6440957e h1:Y+GY+bv5vf1gssphFsGiq6R8qdHxnpDZvYljFnXfhD8=
 github.com/matishsiao/goInfo v0.0.0-20170803142006-617e6440957e/go.mod h1:yLZrFIhv+Z20hxHvcZpEyKVQp9HMsOJkXAxx7yDqtvg=