diff --git a/pkg/hostman/hostinfo/hostbridge/hostbridge.go b/pkg/hostman/hostinfo/hostbridge/hostbridge.go
index d3671e8fcf..1e438fbcf4 100644
--- a/pkg/hostman/hostinfo/hostbridge/hostbridge.go
+++ b/pkg/hostman/hostinfo/hostbridge/hostbridge.go
@@ -50,7 +50,7 @@ type IBridgeDriver interface {
 	SetupBridgeDev() error
 	SetupInterface() error
 	PersistentMac() error
-	DisableDHCPClient() error
+	DisableDHCPClient() (bool, error)
 
 	GenerateIfupScripts(scriptPath string, nic jsonutils.JSONObject) error
 	GenerateIfdownScripts(scriptPath string, nic jsonutils.JSONObject) error
@@ -330,33 +330,33 @@ func (d *SBaseBridgeDriver) WarmupConfig() error {
 	return nil
 }
 
-func (d *SBaseBridgeDriver) DisableDHCPClient() error {
+func (d *SBaseBridgeDriver) DisableDHCPClient() (bool, error) {
 	if d.inter != nil {
 		filename := fmt.Sprintf("/var/run/dhclient-%s.pid", d.inter.String())
 		if !fileutils2.Exists(filename) {
-			return nil
+			return false, nil
 		}
 		s, err := fileutils2.FileGetContents(filename)
 		if err != nil {
-			return errors.Wrap(err, "get dhclient pid")
+			return false, errors.Wrap(err, "get dhclient pid")
 		}
 		pid, err := strconv.Atoi(strings.TrimSpace(s))
 		if err != nil {
-			return errors.Wrap(err, "convert pid str to int")
+			return false, errors.Wrap(err, "convert pid str to int")
 		}
 		if fileutils2.Exists(fmt.Sprintf("/proc/%d/cmdline", pid)) {
 			cmdline, err := fileutils2.FileGetContents(fmt.Sprintf("/proc/%d/cmdline", pid))
 			if err != nil {
-				return errors.Wrap(err, "get proc cmdline")
+				return false, errors.Wrap(err, "get proc cmdline")
 			}
 			if strings.Contains(cmdline, "dhclient") {
 				// kill process
 				p, _ := os.FindProcess(pid)
-				return p.Kill()
+				return true, p.Kill()
 			}
 		}
 	}
-	return nil
+	return false, nil
 }
 
 func NewDriver(bridgeDriver, bridge, inter, ip string) (IBridgeDriver, error) {
diff --git a/pkg/hostman/hostinfo/hostinfo.go b/pkg/hostman/hostinfo/hostinfo.go
index 5dc82eb64b..541c18a1cb 100644
--- a/pkg/hostman/hostinfo/hostinfo.go
+++ b/pkg/hostman/hostinfo/hostinfo.go
@@ -86,7 +86,9 @@ type SHostInfo struct {
 	CloudregionId  string
 	ZoneManagerUri string
 
-	FullName string
+	FullName   string
+	SysError   map[string]string
+	SysWarning map[string]string
 }
 
 func (h *SHostInfo) GetIsolatedDeviceManager() *isolated_device.IsolatedDeviceManager {
@@ -627,6 +629,9 @@ func (h *SHostInfo) detectSyssoftwareInfo() error {
 		return err
 	}
 	h.detectOvsVersion()
+	if err := h.detectOvsKOVersion(); err != nil {
+		h.SysError["openvswitch"] = err.Error()
+	}
 	return nil
 }
 
@@ -667,6 +672,21 @@ func (h *SHostInfo) detectOvsVersion() {
 	}
 }
 
+func (h *SHostInfo) detectOvsKOVersion() error {
+	output, err := procutils.NewRemoteCommandAsFarAsPossible("modinfo", "openvswitch").Output()
+	if err != nil {
+		return errors.Wrap(err, "modinfo openvswitch")
+	}
+	lines := strings.Split(string(output), "\n")
+	for i := 0; i < len(lines); i++ {
+		if strings.HasPrefix(lines[i], "version:") {
+			log.Infof("kernel module openvswitch %s", lines[i])
+			return nil
+		}
+	}
+	return errors.Errorf("kernel module openvswitch paramters version not found, is kernel version correct ??")
+}
+
 func (h *SHostInfo) GetMasterNicIpAndMask() (string, int) {
 	log.Errorf("MasterNic %#v", h.MasterNic)
 	if h.MasterNic != nil {
@@ -976,8 +996,11 @@ func (h *SHostInfo) updateHostMetadata(hostname string) error {
 		OnKubernetes: onK8s,
 		Hostname:     hostname,
 	}
+	data := meta.JSON(meta)
+	data.Set("__sys_error", jsonutils.Marshal(h.SysError))
+	data.Set("__sys_warning", jsonutils.Marshal(h.SysWarning))
 
-	_, err := modules.Hosts.SetMetadata(h.GetSession(), h.HostId, meta.JSON(meta))
+	_, err := modules.Hosts.SetMetadata(h.GetSession(), h.HostId, data)
 	return err
 }
 
@@ -1055,6 +1078,14 @@ func (h *SHostInfo) PutHostOffline() {
 }
 
 func (h *SHostInfo) PutHostOnline() error {
+	if len(h.SysError) > 0 {
+		log.Fatalf("Can't put host online, unless resolve these problem %v", h.SysError)
+	}
+
+	if len(h.SysWarning) > 0 {
+		log.Warningf("Host have some hidden problem %v", h.SysWarning)
+	}
+
 	data := jsonutils.NewDict()
 	if options.HostOptions.EnableHealthChecker && len(options.HostOptions.EtcdEndpoints) > 0 {
 		_, err := host_health.InitHostHealthManager(h.HostId, h.onHostDown)
@@ -1622,6 +1653,8 @@ func NewHostInfo() (*SHostInfo, error) {
 
 	res.Nics = make([]*SNIC, 0)
 	res.IsRegistered = make(chan struct{})
+	res.SysError = make(map[string]string)
+	res.SysWarning = make(map[string]string)
 	return res, nil
 }
 
diff --git a/pkg/hostman/hostinfo/hostinfohelper.go b/pkg/hostman/hostinfo/hostinfohelper.go
index a1767ab478..20c6f0b8cf 100644
--- a/pkg/hostman/hostinfo/hostinfohelper.go
+++ b/pkg/hostman/hostinfo/hostinfohelper.go
@@ -349,8 +349,10 @@ func NewNIC(desc string) (*SNIC, error) {
 	if err := nic.BridgeDev.PersistentMac(); err != nil {
 		return nil, err
 	}
-	if err := nic.BridgeDev.DisableDHCPClient(); err != nil {
+	if isDHCP, err := nic.BridgeDev.DisableDHCPClient(); err != nil {
 		return nil, errors.Wrap(err, "disable dhcp client")
+	} else if isDHCP {
+		Instance().SysWarning["dhcp"] = "dhcp client is enabled before host agent start, please disable it"
 	}
 
 	var dhcpRelay []string