When the system has many NICs and IP addresses (such as an internal network and an external network), ZStack defaults to select the NIC IP address used by the system default route.

Also, you can run the following command to manually specify the IP address listened by the ZStack service:
[root@ceph-host ~]# zstack-ctl configure management.server.ip=${MANAGEMENT_IP}    //${MANAGEMENT_IP} is the IP address specified by the user.
[root@ceph-host ~]# zstack-ctl restart_node   //Restart the management node.