diff --git a/patches/systemvm/debian/config/etc/init.d/cloud-early-config b/patches/systemvm/debian/config/etc/init.d/cloud-early-config
index 0f97ebf5cee..2eeb951d366 100755
--- a/patches/systemvm/debian/config/etc/init.d/cloud-early-config
+++ b/patches/systemvm/debian/config/etc/init.d/cloud-early-config
@@ -283,6 +283,7 @@ setup_apache2() {
 }
 
 setup_redundant_router() {
+    rm /tmp/rrouter.lock
     ip route delete default
     cp /root/redundant_router/keepalived.conf.templ /etc/keepalived/keepalived.conf
     cp /root/redundant_router/conntrackd.conf.templ /etc/conntrackd/conntrackd.conf
diff --git a/patches/systemvm/debian/config/root/redundant_router/backup.sh b/patches/systemvm/debian/config/root/redundant_router/backup.sh
index db7811e0ce3..8efe190028d 100644
--- a/patches/systemvm/debian/config/root/redundant_router/backup.sh
+++ b/patches/systemvm/debian/config/root/redundant_router/backup.sh
@@ -1,8 +1,32 @@
 #!/bin/bash
 
+LOCK=/tmp/rrouter.lock
+locked=0
+
+# Wait the lock
+for i in `seq 1 5`
+do
+    if [ ! -e $LOCK ]
+    then
+        touch $LOCK
+        locked=1
+        break
+    fi
+    sleep 1
+    echo sleep 1
+done
+
+if [ $locked -eq 0 ]
+then
+    echo Status: fail to get the lock! >> /root/keepalived.log
+    exit
+fi
+
 echo To backup called >> /root/keepalived.log
 /root/redundant_router/disable_pubip.sh
 echo Disable public ip $? >> /root/keepalived.log
 /root/redundant_router/primary-backup.sh backup
 echo Switch conntrackd mode backup $? >> /root/keepalived.log
 echo Status: BACKUP >> /root/keepalived.log
+
+rm $LOCK
diff --git a/patches/systemvm/debian/config/root/redundant_router/master.sh b/patches/systemvm/debian/config/root/redundant_router/master.sh
index 22ac940e21d..76253c0042f 100644
--- a/patches/systemvm/debian/config/root/redundant_router/master.sh
+++ b/patches/systemvm/debian/config/root/redundant_router/master.sh
@@ -1,8 +1,32 @@
 #!/bin/bash
 
+LOCK=/tmp/rrouter.lock
+locked=0
+
+# Wait the lock
+for i in `seq 1 5`
+do
+    if [ ! -e $LOCK ]
+    then
+        touch $LOCK
+        locked=1
+        break
+    fi
+    sleep 1
+    echo sleep 1
+done
+
+if [ $locked -eq 0 ]
+then
+    echo Status: fail to get the lock! >> /root/keepalived.log
+    exit
+fi
+
 echo To master called >> /root/keepalived.log
 /root/redundant_router/enable_pubip.sh
 echo Enable public ip $? >> /root/keepalived.log
 /root/redundant_router/primary-backup.sh primary
 echo Switch conntrackd mode primary $? >> /root/keepalived.log
 echo Status: MASTER >> /root/keepalived.log
+
+rm $LOCK