diff --git a/src/inc/mnode.h b/src/inc/mnode.h
index b608defc6a1a86847f7d211f560fc2e2c5d9731a..ecfd041b0ab5a2fec6a3be9c7dc53e0e5111cfbb 100644
--- a/src/inc/mnode.h
+++ b/src/inc/mnode.h
@@ -45,6 +45,12 @@ extern int   mgmtShellConns;
 extern int   mgmtDnodeConns;
 extern char  mgmtDirectory[];
 
+extern int tsAcctUpdateSize;
+extern int tsDbUpdateSize;
+extern int tsDnodeUpdateSize;
+extern int tsMnodeUpdateSize;
+extern int tsUserUpdateSize;
+extern int tsVgUpdateSize;
 
 typedef struct {
   uint32_t   privateIp;
@@ -256,96 +262,9 @@ typedef struct {
   char     payload[];  /* payload for wildcard match in show tables */
 } SShowObj;
 
-extern SAcctObj  acctObj;
-extern SDnodeObj dnodeObj;
-
-
-// shell API
-int  mgmtInitShell();
-void mgmtCleanUpShell();
-int mgmtRetriveUserAuthInfo(char *user, char *spi, char *encrypt, uint8_t *secret, uint8_t *ckey);
-
-// user API
-int       mgmtInitUsers();
-SUserObj *mgmtGetUser(char *name);
-int mgmtCreateUser(SAcctObj *pAcct, char *name, char *pass);
-int mgmtDropUser(SAcctObj *pAcct, char *name);
-int mgmtUpdateUser(SUserObj *pUser);
-int mgmtGetUserMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int mgmtRetrieveUsers(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-void mgmtCleanUpUsers();
-
-// metric API
-int mgmtAddMeterIntoMetric(STabObj *pMetric, STabObj *pTable);
-int mgmtRemoveMeterFromMetric(STabObj *pMetric, STabObj *pTable);
-int mgmtGetMetricMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int mgmtRetrieveMetrics(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-
-// DB API
-/* void    mgmtMonitorDbDrop(void *unused); */
-void mgmtMonitorDbDrop(void *unused, void *unusedt);
-int mgmtAlterDb(SAcctObj *pAcct, SAlterDbMsg *pAlter);
-int mgmtUseDb(SConnObj *pConn, char *name);
-int mgmtAddVgroupIntoDb(SDbObj *pDb, SVgObj *pVgroup);
-int mgmtAddVgroupIntoDbTail(SDbObj *pDb, SVgObj *pVgroup);
-int mgmtRemoveVgroupFromDb(SDbObj *pDb, SVgObj *pVgroup);
-int mgmtAddMetricIntoDb(SDbObj *pDb, STabObj *pMetric);
-int mgmtRemoveMetricFromDb(SDbObj *pDb, STabObj *pMetric);
-int mgmtMoveVgroupToTail(SDbObj *pDb, SVgObj *pVgroup);
-int mgmtMoveVgroupToHead(SDbObj *pDb, SVgObj *pVgroup);
-int mgmtGetDbMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int mgmtRetrieveDbs(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-void mgmtCleanUpDbs();
-
-// vGroup API
-int     mgmtInitVgroups();
-SVgObj *mgmtGetVgroup(int vgId);
-SVgObj *mgmtCreateVgroup(SDbObj *pDb);
-int  mgmtDropVgroup(SDbObj *pDb, SVgObj *pVgroup);
-void mgmtSetVgroupIdPool();
-int  mgmtGetVgroupMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int  mgmtRetrieveVgroups(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-void mgmtCleanUpVgroups();
-
-// meter API
-int      mgmtInitMeters();
-STabObj *mgmtGetTable(char *meterId);
-STabObj *mgmtGetTableInfo(char *src, char *tags[]);
-int mgmtRetrieveMetricMeta(SConnObj *pConn, char **pStart, SSuperTableMetaMsg *pInfo);
-int mgmtCreateMeter(SDbObj *pDb, SCreateTableMsg *pCreate);
-int mgmtDropMeter(SDbObj *pDb, char *meterId, int ignore);
-int mgmtAlterMeter(SDbObj *pDb, SAlterTableMsg *pAlter);
-int mgmtGetTableMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int mgmtRetrieveMeters(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-void     mgmtCleanUpMeters();
-SSchema *mgmtGetTableSchema(STabObj *pTable);  // get schema for a meter
-
-
-// dnode API
-
-int mgmtGetMnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int mgmtRetrieveMnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-
-
-
-
-int  mgmtGetVnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
-int  mgmtRetrieveVnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
-
-
-void mgmtSetModuleInDnode(SDnodeObj *pDnode, int moduleType);
-int mgmtUnSetModuleInDnode(SDnodeObj *pDnode, int moduleType);
-
-
-extern int tsDnodeUpdateSize;
-extern int tsVgUpdateSize;
-extern int tsDbUpdateSize;
-extern int tsUserUpdateSize;
-extern int tsAcctUpdateSize;
-extern int tsMnodeUpdateSize;
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif  // TDENGINE_MGMT_H
+#endif
diff --git a/src/mnode/inc/mgmtDb.h b/src/mnode/inc/mgmtDb.h
index 7c29b618906b89d19e33db710970eb590c1b9740..79c3509ece15dc6380ea63d1104a282851ef3616 100644
--- a/src/mnode/inc/mgmtDb.h
+++ b/src/mnode/inc/mgmtDb.h
@@ -22,13 +22,28 @@ extern "C" {
 
 #include "mnode.h"
 
-int mgmtInitDbs();
-int mgmtUpdateDb(SDbObj *pDb);
+void mgmtMonitorDbDrop(void *unused, void *unusedt);
+int mgmtAlterDb(SAcctObj *pAcct, SAlterDbMsg *pAlter);
+int mgmtUseDb(SConnObj *pConn, char *name);
+int mgmtAddVgroupIntoDb(SDbObj *pDb, SVgObj *pVgroup);
+int mgmtAddVgroupIntoDbTail(SDbObj *pDb, SVgObj *pVgroup);
+int mgmtRemoveVgroupFromDb(SDbObj *pDb, SVgObj *pVgroup);
+int mgmtAddMetricIntoDb(SDbObj *pDb, STabObj *pMetric);
+int mgmtRemoveMetricFromDb(SDbObj *pDb, STabObj *pMetric);
+int mgmtMoveVgroupToTail(SDbObj *pDb, SVgObj *pVgroup);
+int mgmtMoveVgroupToHead(SDbObj *pDb, SVgObj *pVgroup);
+int mgmtGetDbMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+int mgmtRetrieveDbs(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
+void mgmtCleanUpDbs();
+
+
+int32_t mgmtInitDbs();
+int     mgmtUpdateDb(SDbObj *pDb);
 SDbObj *mgmtGetDb(char *db);
 SDbObj *mgmtGetDbByMeterId(char *db);
-int mgmtCreateDb(SAcctObj *pAcct, SCreateDbMsg *pCreate);
-int mgmtDropDbByName(SAcctObj *pAcct, char *name, short ignoreNotExists);
-int mgmtDropDb(SDbObj *pDb);
+int     mgmtCreateDb(SAcctObj *pAcct, SCreateDbMsg *pCreate);
+int     mgmtDropDbByName(SAcctObj *pAcct, char *name, short ignoreNotExists);
+int     mgmtDropDb(SDbObj *pDb);
 
 #ifdef __cplusplus
 }
diff --git a/src/mnode/inc/mgmtDnode.h b/src/mnode/inc/mgmtDnode.h
index 8c835493af354c757b776be7122f6eca945180fd..a881601364b99ad14b4b487543c1e4e4afc199ea 100644
--- a/src/mnode/inc/mgmtDnode.h
+++ b/src/mnode/inc/mgmtDnode.h
@@ -41,6 +41,9 @@ int32_t mgmtRetrieveConfigs(SShowObj *pShow, char *data, int rows, SConnObj *pCo
 int32_t mgmtGetModuleMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
 int32_t mgmtRetrieveModules(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
 
+int32_t mgmtGetVnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+int32_t mgmtRetrieveVnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
+
 extern int32_t    (*mgmtInitDnodes)();
 extern void       (*mgmtCleanUpDnodes)();
 extern SDnodeObj* (*mgmtGetDnode)(uint32_t ip);
@@ -52,6 +55,8 @@ extern int32_t    (*mgmtGetScoresMeta)(SMeterMeta *pMeta, SShowObj *pShow, SConn
 extern int32_t    (*mgmtRetrieveScores)(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
 extern bool       (*mgmtCheckConfigShow)(SGlobalConfig *cfg);
 
+extern SDnodeObj dnodeObj;
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/mnode/inc/mgmtDnodeInt.h b/src/mnode/inc/mgmtDnodeInt.h
index 83d30884148b1db191fe6685c2d601e6458ad3eb..20de92b6ef08730779f36c6e94222fa5521b3013 100644
--- a/src/mnode/inc/mgmtDnodeInt.h
+++ b/src/mnode/inc/mgmtDnodeInt.h
@@ -24,7 +24,8 @@ extern "C" {
 #include <stdbool.h>
 #include "mnode.h"
 
-// dnodeInt API
+extern void *mgmtStatusTimer;
+
 int mgmtSendCreateMsgToVgroup(STabObj *pTable, SVgObj *pVgroup);
 int mgmtSendRemoveMeterMsgToDnode(STabObj *pTable, SVgObj *pVgroup);
 int mgmtSendVPeersMsg(SVgObj *pVgroup);
diff --git a/src/mnode/src/mgmtMnode.spec.c b/src/mnode/inc/mgmtMnode.h
similarity index 64%
rename from src/mnode/src/mgmtMnode.spec.c
rename to src/mnode/inc/mgmtMnode.h
index d32639823be88c1db33f1a70a4b0154441163402..94ec307c43e23c70a00b7ab29adf5a1ed29acc51 100644
--- a/src/mnode/src/mgmtMnode.spec.c
+++ b/src/mnode/inc/mgmtMnode.h
@@ -13,9 +13,22 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _DEFAULT_SOURCE
+#ifndef TDENGINE_MGMT_MNODE_H
+#define TDENGINE_MGMT_MNODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
 #include "mnode.h"
 
-int mgmtGetMnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn) { return TSDB_CODE_OPS_NOT_SUPPORT; }
+extern int32_t (*mgmtGetMnodeMeta)(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+extern int32_t (*mgmtRetrieveMnodes)(SShowObj *pShow, char *data, int32_t rows, SConnObj *pConn);
+
+#ifdef __cplusplus
+}
+#endif
 
-int mgmtRetrieveMnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn) { return 0; }
+#endif
diff --git a/src/mnode/inc/mgmtShell.h b/src/mnode/inc/mgmtShell.h
new file mode 100644
index 0000000000000000000000000000000000000000..22650adc3d9e29d405415e83ce92142e32cbc195
--- /dev/null
+++ b/src/mnode/inc/mgmtShell.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TDENGINE_MGMT_SHELL_H
+#define TDENGINE_MGMT_SHELL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "mnode.h"
+
+int  mgmtInitShell();
+void mgmtCleanUpShell();
+int mgmtRetriveUserAuthInfo(char *user, char *spi, char *encrypt, uint8_t *secret, uint8_t *ckey);
+
+extern int32_t (*mgmtCheckRedirectMsg)(SConnObj *pConn, int32_t msgType);
+extern int32_t (*mgmtProcessAlterAcctMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+extern int32_t (*mgmtProcessCreateDnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+extern int32_t (*mgmtProcessCfgMnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+extern int32_t (*mgmtProcessDropMnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+extern int32_t (*mgmtProcessDropDnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+extern int32_t (*mgmtProcessDropAcctMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+extern int32_t (*mgmtProcessCreateAcctMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/mnode/inc/mgmtSystem.h b/src/mnode/inc/mgmtSystem.h
index 6f0c669e158cf14429fbab1a08e85f0831a6bf1f..6bbea549c72c7733808c4c776e367916350316d3 100644
--- a/src/mnode/inc/mgmtSystem.h
+++ b/src/mnode/inc/mgmtSystem.h
@@ -20,30 +20,17 @@
 extern "C" {
 #endif
 
-int  mgmtInitRedirect();
+#include <stdint.h>
 
-void mgmtCleanUpRedirect();
+int32_t mgmtStartSystem();
+void    mgmtCleanUpSystem();
 
-void*mgmtRedirectAllMsgs(char *msg, void *ahandle, void *thandle);
-
-void mgmtSdbWorkAsMasterCallback();
-
-void mgmtSetDnodeOfflineOnSdbChanged();
-
-void mgmtPrintSystemInfo();
-
-int  mgmtInitSystem();
-
-int  mgmtStartCheckMgmtRunning();
-
-void mgmtDoStatistic(void *handle, void *tmrId);
-
-void mgmtStartMgmtTimer();
-
-int mgmtStartSystem();
-void mgmtStopSystem();
-
-void mgmtCleanUpSystem();
+extern int32_t (*mgmtInitSystem)();
+extern int32_t (*mgmtCheckMgmtRunning)();
+extern void    (*mgmtDoStatistic)(void *handle, void *tmrId);
+extern void    (*mgmtStartMgmtTimer)();
+extern void    (*mgmtStopSystem)();
+extern void    (*mgmtCleanUpRedirect)();
 
 #ifdef __cplusplus
 }
diff --git a/src/mnode/inc/mgmtTable.h b/src/mnode/inc/mgmtTable.h
index c5fe623c4d4e34aab20e565c19d1fd92aba514d5..f4a5466ff85116efce61e98c2eabc5e4bf908db3 100644
--- a/src/mnode/inc/mgmtTable.h
+++ b/src/mnode/inc/mgmtTable.h
@@ -25,8 +25,27 @@ extern "C" {
 #include <stdint.h>
 #include "mnode.h"
 
+int      mgmtInitMeters();
+STabObj *mgmtGetTable(char *meterId);
+STabObj *mgmtGetTableInfo(char *src, char *tags[]);
+int      mgmtRetrieveMetricMeta(SConnObj *pConn, char **pStart, SSuperTableMetaMsg *pInfo);
+int      mgmtCreateMeter(SDbObj *pDb, SCreateTableMsg *pCreate);
+int      mgmtDropMeter(SDbObj *pDb, char *meterId, int ignore);
+int      mgmtAlterMeter(SDbObj *pDb, SAlterTableMsg *pAlter);
+int      mgmtGetTableMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+int      mgmtRetrieveMeters(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
+void     mgmtCleanUpMeters();
+SSchema *mgmtGetTableSchema(STabObj *pTable);  // get schema for a meter
+
 int32_t mgmtFindTagCol(STabObj * pTable, const char * tagName);
 
+int mgmtAddMeterIntoMetric(STabObj *pMetric, STabObj *pTable);
+int mgmtRemoveMeterFromMetric(STabObj *pMetric, STabObj *pTable);
+int mgmtGetMetricMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+int mgmtRetrieveMetrics(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
+
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/mnode/inc/mgmtUser.h b/src/mnode/inc/mgmtUser.h
new file mode 100644
index 0000000000000000000000000000000000000000..52f19baff049695f85cf01f651aa39c52b72c947
--- /dev/null
+++ b/src/mnode/inc/mgmtUser.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TDENGINE_MGMT_USER_H
+#define TDENGINE_MGMT_USER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "mnode.h"
+
+int       mgmtInitUsers();
+SUserObj *mgmtGetUser(char *name);
+int       mgmtCreateUser(SAcctObj *pAcct, char *name, char *pass);
+int       mgmtDropUser(SAcctObj *pAcct, char *name);
+int       mgmtUpdateUser(SUserObj *pUser);
+int       mgmtGetUserMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+int       mgmtRetrieveUsers(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
+void      mgmtCleanUpUsers();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/mnode/inc/mgmtVgroup.h b/src/mnode/inc/mgmtVgroup.h
new file mode 100644
index 0000000000000000000000000000000000000000..121ae000b00f7433526f2581c7a0c7c955f99b2f
--- /dev/null
+++ b/src/mnode/inc/mgmtVgroup.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TDENGINE_MGMT_VGROUP_H
+#define TDENGINE_MGMT_VGROUP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "mnode.h"
+
+int     mgmtInitVgroups();
+SVgObj *mgmtGetVgroup(int vgId);
+SVgObj *mgmtCreateVgroup(SDbObj *pDb);
+int     mgmtDropVgroup(SDbObj *pDb, SVgObj *pVgroup);
+void    mgmtSetVgroupIdPool();
+int     mgmtGetVgroupMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn);
+int     mgmtRetrieveVgroups(SShowObj *pShow, char *data, int rows, SConnObj *pConn);
+void    mgmtCleanUpVgroups();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/mnode/src/mgmtAcct.c b/src/mnode/src/mgmtAcct.c
index 1fcfc4bb08425ee8f156cca25ef144c440afa832..67b14c319e36b615e9ec7690a1dd715ddde94b6c 100644
--- a/src/mnode/src/mgmtAcct.c
+++ b/src/mnode/src/mgmtAcct.c
@@ -17,6 +17,8 @@
 #include "os.h"
 #include "mnode.h"
 #include "mgmtAcct.h"
+#include "mgmtTable.h"
+#include "mgmtUser.h"
 #include "tschemautil.h"
 
 extern void *userSdb;
diff --git a/src/mnode/src/mgmtBalance.c b/src/mnode/src/mgmtBalance.c
index 5b32ff0405d40d7ed1c52543b00f1f2159dbd37c..aa7448865f4b4a1e72a63881217b40363563b95e 100644
--- a/src/mnode/src/mgmtBalance.c
+++ b/src/mnode/src/mgmtBalance.c
@@ -15,6 +15,7 @@
 
 #define _DEFAULT_SOURCE
 #include "mgmtBalance.h"
+#include "mgmtDnode.h"
 #include "dnodeModule.h"
 #include "tstatus.h"
 #include "tglobalcfg.h"
diff --git a/src/mnode/src/mgmtDb.c b/src/mnode/src/mgmtDb.c
index bb764ce0f94f16edecfa721261bf59deb4b56c2a..c8bed2e497b529fc746e3efa7f6bbec910ece76e 100644
--- a/src/mnode/src/mgmtDb.c
+++ b/src/mnode/src/mgmtDb.c
@@ -22,6 +22,8 @@
 #include "mgmtBalance.h"
 #include "mgmtDnodeInt.h"
 #include "mgmtUtil.h"
+#include "mgmtVgroup.h"
+#include "mgmtTable.h"
 #include "tschemautil.h"
 #include "tstatus.h"
 #include "mnode.h"
@@ -73,7 +75,7 @@ void mgmtGetAcctStr(char *src, char *dest) {
   *dest = 0;
 }
 
-int mgmtInitDbs() {
+int32_t mgmtInitDbs() {
   void *    pNode = NULL;
   SDbObj *  pDb = NULL;
   SAcctObj *pAcct = NULL;
diff --git a/src/mnode/src/mgmtDnode.c b/src/mnode/src/mgmtDnode.c
index c96f331be828980f8a5f643f6ec7b40e66efd405..c3791ab8d1c2ec97c7904ebeb5e9d940828f122c 100644
--- a/src/mnode/src/mgmtDnode.c
+++ b/src/mnode/src/mgmtDnode.c
@@ -387,7 +387,7 @@ int mgmtRetrieveConfigs(SShowObj *pShow, char *data, int rows, SConnObj *pConn)
   return numOfRows;
 }
 
-int mgmtGetVnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn) {
+int32_t mgmtGetVnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn) {
   int cols = 0;
 
   if (strcmp(pConn->pAcct->user, "root") != 0) return TSDB_CODE_NO_RIGHTS;
@@ -460,7 +460,7 @@ int mgmtGetVnodeMeta(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn) {
   return 0;
 }
 
-int mgmtRetrieveVnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn) {
+int32_t mgmtRetrieveVnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn) {
   int        numOfRows = 0;
   SDnodeObj *pDnode = NULL;
   char *     pWrite;
diff --git a/src/mnode/src/mgmtDnodeInt.c b/src/mnode/src/mgmtDnodeInt.c
index 7e8c733b62aa8e1eaa0da0c936923e04e1738709..ef47510810004a736b67db5a196deb60ca462b48 100644
--- a/src/mnode/src/mgmtDnodeInt.c
+++ b/src/mnode/src/mgmtDnodeInt.c
@@ -22,6 +22,8 @@
 #include "mgmtBalance.h"
 #include "mgmtDnode.h"
 #include "mgmtDb.h"
+#include "mgmtVgroup.h"
+#include "mgmtTable.h"
 #include "tutil.h"
 #include "tstatus.h"
 #include "tsystem.h"
diff --git a/src/mnode/src/mgmtSystem.spec.c b/src/mnode/src/mgmtMnode.c
similarity index 56%
rename from src/mnode/src/mgmtSystem.spec.c
rename to src/mnode/src/mgmtMnode.c
index a047f6d8569a974a9d5c1189404e5368d360bfe3..83171fc1491537480e2ca595af2e8ed86dba26a0 100644
--- a/src/mnode/src/mgmtSystem.spec.c
+++ b/src/mnode/src/mgmtMnode.c
@@ -14,25 +14,10 @@
  */
 
 #define _DEFAULT_SOURCE
-#include <arpa/inet.h>
+#include "mgmtMnode.h"
 
-#include "dnodeSystem.h"
-#include "mnode.h"
-
-extern void *mgmtTmr;
-extern void *mgmtStatusTimer;
-
-void mgmtProcessDnodeStatus(void *handle, void *tmrId);
-
-int mgmtInitSystem() { return mgmtStartSystem(); }
-
-int32_t mgmtStartCheckMgmtRunning() { return 0; }
-
-void mgmtDoStatistic(void *handle, void *tmrId) {}
-
-void mgmtStartMgmtTimer() { taosTmrReset(mgmtProcessDnodeStatus, 500, NULL, mgmtTmr, &mgmtStatusTimer); }
-
-void mgmtStopSystem() {}
-
-void mgmtCleanUpRedirect() {}
+int32_t mgmtGetMnodeMetaImp(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn) { return TSDB_CODE_OPS_NOT_SUPPORT; }
+int32_t (*mgmtGetMnodeMeta)(SMeterMeta *pMeta, SShowObj *pShow, SConnObj *pConn) = mgmtGetMnodeMetaImp;
 
+int32_t mgmtRetrieveMnodesImp(SShowObj *pShow, char *data, int32_t rows, SConnObj *pConn) { return 0; }
+int32_t (*mgmtRetrieveMnodes)(SShowObj *pShow, char *data, int32_t rows, SConnObj *pConn) = mgmtRetrieveMnodesImp;
diff --git a/src/mnode/src/mgmtShell.c b/src/mnode/src/mgmtShell.c
index 5cf0ab5623be9ec410b0a8e28546e1fa7f66a584..1204ba9720a3f35a1d430c19519fb6fbbaa0609c 100644
--- a/src/mnode/src/mgmtShell.c
+++ b/src/mnode/src/mgmtShell.c
@@ -24,9 +24,13 @@
 #include "mgmtDb.h"
 #include "mgmtDnode.h"
 #include "mgmtGrant.h"
+#include "mgmtMnode.h"
 #include "mgmtProfile.h"
+#include "mgmtShell.h"
 #include "mgmtTable.h"
+#include "mgmtUser.h"
 #include "mgmtUtil.h"
+#include "mgmtVgroup.h"
 #include "taosmsg.h"
 #include "tlog.h"
 #include "tstatus.h"
@@ -48,17 +52,6 @@ void      mgmtInitProcessShellMsg();
 int       mgmtRedirectMsg(SConnObj *pConn, int msgType);
 int       mgmtKillQuery(char *queryId, SConnObj *pConn);
 
-int mgmtCheckRedirectMsg(SConnObj *pConn, int msgType);
-int mgmtProcessAlterAcctMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessCreateMnodeMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessCreateDnodeMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessCfgMnodeMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessDropMnodeMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessDropDnodeMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessDropAcctMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessCreateAcctMsg(char *pMsg, int msgLen, SConnObj *pConn);
-int mgmtProcessCfgDnodeMsg(char *pMsg, int msgLen, SConnObj *pConn);
-
 void mgmtProcessTranRequest(SSchedMsg *pSchedMsg) {
   SIntMsg * pMsg = (SIntMsg *)(pSchedMsg->msg);
   SConnObj *pConn = (SConnObj *)(pSchedMsg->thandle);
@@ -1537,3 +1530,43 @@ void mgmtInitProcessShellMsg() {
   mgmtProcessShellMsg[TSDB_MSG_TYPE_KILL_STREAM] = mgmtProcessKillStreamMsg;
   mgmtProcessShellMsg[TSDB_MSG_TYPE_KILL_CONNECTION] = mgmtProcessKillConnectionMsg;
 }
+
+int32_t mgmtCheckRedirectMsgImp(SConnObj *pConn, int32_t msgType) {
+  return 0;
+}
+int32_t (*mgmtCheckRedirectMsg)(SConnObj *pConn, int32_t msgType) = mgmtCheckRedirectMsgImp;
+
+int32_t mgmtProcessAlterAcctMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_ALTER_ACCT_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessAlterAcctMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessAlterAcctMsgImp;
+
+int32_t mgmtProcessCreateDnodeMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_CREATE_DNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessCreateDnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessCreateDnodeMsgImp;
+
+int32_t mgmtProcessCfgMnodeMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_CFG_MNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessCfgMnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessCfgMnodeMsgImp;
+
+int32_t mgmtProcessDropMnodeMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_DROP_MNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessDropMnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessDropMnodeMsgImp;
+
+int32_t mgmtProcessDropDnodeMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_DROP_DNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessDropDnodeMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessDropDnodeMsgImp;
+
+int32_t mgmtProcessDropAcctMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_DROP_ACCT_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessDropAcctMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessDropAcctMsgImp;
+
+int32_t mgmtProcessCreateAcctMsgImp(char *pMsg, int32_t msgLen, SConnObj *pConn) {
+  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_CREATE_ACCT_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
+}
+int32_t (*mgmtProcessCreateAcctMsg)(char *pMsg, int32_t msgLen, SConnObj *pConn) = mgmtProcessCreateAcctMsgImp;
\ No newline at end of file
diff --git a/src/mnode/src/mgmtShell.spec.c b/src/mnode/src/mgmtShell.spec.c
deleted file mode 100644
index 5d7786ccd363fba58a480824485c402ad2405096..0000000000000000000000000000000000000000
--- a/src/mnode/src/mgmtShell.spec.c
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#define _DEFAULT_SOURCE
-#include <arpa/inet.h>
-#include "mnode.h"
-
-int mgmtCheckRedirectMsg(SConnObj *pConn, int msgType) { return 0; }
-
-int mgmtProcessAlterAcctMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_ALTER_ACCT_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
-
-int mgmtProcessCreateDnodeMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_CREATE_DNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
-
-int mgmtProcessCfgMnodeMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_CFG_MNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
-
-int mgmtProcessDropMnodeMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_DROP_MNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
-
-int mgmtProcessDropDnodeMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_DROP_DNODE_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
-
-int mgmtProcessDropAcctMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_DROP_ACCT_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
-
-int mgmtProcessCreateAcctMsg(char *pMsg, int msgLen, SConnObj *pConn) {
-  return taosSendSimpleRsp(pConn->thandle, TSDB_MSG_TYPE_CREATE_ACCT_RSP, TSDB_CODE_OPS_NOT_SUPPORT);
-}
\ No newline at end of file
diff --git a/src/mnode/src/mgmtSystem.c b/src/mnode/src/mgmtSystem.c
index ec1fbcb3cedbd6cbb4af1d332eddb38d0638c58c..3ed29fdd0912d9483cdc404d59e315f38ac22b68 100644
--- a/src/mnode/src/mgmtSystem.c
+++ b/src/mnode/src/mgmtSystem.c
@@ -18,9 +18,18 @@
 
 #include "dnodeSystem.h"
 #include "mnode.h"
-#include "tsdb.h"
+#include "mgmtAcct.h"
+#include "mgmtBalance.h"
+#include "mgmtDb.h"
+#include "mgmtDnode.h"
+#include "mgmtDnodeInt.h"
+#include "mgmtVgroup.h"
+#include "mgmtUser.h"
 #include "mgmtSystem.h"
+#include "mgmtTable.h"
+#include "mgmtShell.h"
 #include "dnodeModule.h"
+#include "tsdb.h"
 
 // global, not configurable
 char               mgmtDirectory[128];
@@ -76,7 +85,7 @@ int mgmtStartSystem() {
     mkdir(mgmtDirectory, 0755);
   }
 
-  if (mgmtStartCheckMgmtRunning() != 0) {
+  if (mgmtCheckMgmtRunning() != 0) {
     mPrint("TDengine mgmt module already started...");
     return 0;
   }
@@ -152,3 +161,24 @@ int mgmtStartSystem() {
 
   return 0;
 }
+
+int32_t mgmtInitSystemImp() { return mgmtStartSystem(); }
+int32_t (*mgmtInitSystem)() = mgmtInitSystemImp;
+
+int32_t mgmtCheckMgmtRunningImp() { return 0; }
+int32_t (*mgmtCheckMgmtRunning)() = mgmtCheckMgmtRunningImp;
+
+void mgmtDoStatisticImp(void *handle, void *tmrId) {}
+void (*mgmtDoStatistic)(void *handle, void *tmrId) = mgmtDoStatisticImp;
+
+void mgmtStartMgmtTimerImp() {
+  taosTmrReset(mgmtProcessDnodeStatus, 500, NULL, mgmtTmr, &mgmtStatusTimer);
+}
+void (*mgmtStartMgmtTimer)() = mgmtStartMgmtTimerImp;
+
+void mgmtStopSystemImp() {}
+void (*mgmtStopSystem)() = mgmtStopSystemImp;
+
+void mgmtCleanUpRedirectImp() {}
+void (*mgmtCleanUpRedirect)() = mgmtCleanUpRedirectImp;
+
diff --git a/src/mnode/src/mgmtTable.c b/src/mnode/src/mgmtTable.c
index 8f686703558188010e483622211c03e6901c7125..e7a4aebb9cee00835e8a2f1754415b032a54c4dc 100644
--- a/src/mnode/src/mgmtTable.c
+++ b/src/mnode/src/mgmtTable.c
@@ -22,7 +22,9 @@
 #include "mgmtUtil.h"
 #include "mgmtDb.h"
 #include "mgmtDnodeInt.h"
+#include "mgmtVgroup.h"
 #include "mgmtSupertableQuery.h"
+#include "mgmtTable.h"
 #include "taosmsg.h"
 #include "tast.h"
 #include "textbuffer.h"
diff --git a/src/mnode/src/mgmtUser.c b/src/mnode/src/mgmtUser.c
index dd97d7b377800cee24e9a4f4fa6bd65033128eaa..1e2a782d09583ba30719664c3b981bfcb458da3c 100644
--- a/src/mnode/src/mgmtUser.c
+++ b/src/mnode/src/mgmtUser.c
@@ -17,8 +17,10 @@
 #include "os.h"
 
 #include "mnode.h"
-#include "mgmtGrant.h"
 #include "mgmtAcct.h"
+#include "mgmtUser.h"
+#include "mgmtGrant.h"
+#include "mgmtTable.h"
 #include "tschemautil.h"
 #include "ttime.h"
 
diff --git a/src/mnode/src/mgmtUtil.c b/src/mnode/src/mgmtUtil.c
index 99f57b9bae9aedf89b29e1efb4acc1ae506a0e38..645758401b78f0ce6b2875d79f967240e516db14 100644
--- a/src/mnode/src/mgmtUtil.c
+++ b/src/mnode/src/mgmtUtil.c
@@ -17,6 +17,7 @@
 #include "os.h"
 #include "mnode.h"
 #include "mgmtUtil.h"
+#include "mgmtTable.h"
 #include "tschemautil.h"
 
 bool mgmtTableCreateFromSuperTable(STabObj* pTableObj) {
diff --git a/src/mnode/src/mgmtVgroup.c b/src/mnode/src/mgmtVgroup.c
index 7b01fdca6c1ab7de6cc5701c724b86432c6194f5..2f4c78f2a8cea31ff5047eaf75c73968da58ddf1 100644
--- a/src/mnode/src/mgmtVgroup.c
+++ b/src/mnode/src/mgmtVgroup.c
@@ -21,6 +21,8 @@
 #include "mgmtDb.h"
 #include "mgmtDnode.h"
 #include "mgmtDnodeInt.h"
+#include "mgmtVgroup.h"
+#include "mgmtTable.h"
 #include "tschemautil.h"
 #include "tlog.h"
 #include "tstatus.h"