bugfix: get ip address by hostname -i

pkg/netutils/interface.go

@@ -7,10 +7,12 @@ import (
 	"io"
 	"net"
 	"os"
-
 	"strings"
 
+	"github.com/alibaba/pouch/pkg/exec"
+
 	"github.com/golang/glog"
+	"github.com/pkg/errors"
 )
 
 // AddressFamily is the ip address type.
@@ -362,17 +364,43 @@ func chooseHostInterfaceFromRoute(routes []Route, nw networkInterfacer) (net.IP,
 	return nil, fmt.Errorf("unable to select an IP from default routes")
 }
 
+func getAddrByHostname() (net.IP, error) {
+	exit, stdout, stderr, err := exec.Run(0, "hostname", "-i")
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to get ip address, stdout: (%s), stderr: (%s), exit: (%s)",
+			stdout, stderr, exit)
+	}
+
+	if exit != 0 {
+		return nil, errors.Errorf("failed to get ip address, stdout: (%s), stderr: (%s), exit: (%s)",
+			stdout, stderr, exit)
+	}
+
+	addr := net.ParseIP(strings.TrimSpace(stdout))
+	if addr == nil {
+		return nil, errors.Errorf("failed to get ip address, invalid format: (%s)", stdout)
+	}
+
+	return addr, nil
+}
+
 // ChooseBindAddress is used to choose an Host IP address for binding.
 // If bind-address is usable, return it directly
 // If bind-address is not usable (unset, 0.0.0.0, or loopback), we will use the host's default
 // interface.
 func ChooseBindAddress(bindAddress net.IP) (net.IP, error) {
 	if bindAddress == nil || bindAddress.IsUnspecified() || bindAddress.IsLoopback() {
 		hostIP, err := ChooseHostInterface()
-		if err != nil {
-			return nil, err
+		if err == nil {
+			bindAddress = hostIP
+		} else {
+			hostIP, err = getAddrByHostname()
+			if err != nil {
+				return nil, err
+			}
+			bindAddress = hostIP
 		}
-		bindAddress = hostIP
+
 	}
 	return bindAddress, nil
 }