1. apt-get install ddclient

2. mkdir /etc/ddclient

3. copy ddclient.conf to /etc/ddclient

4. scp ddclient-3.9.0/ddclient alfred@172.16.13.250:/tmp

5. copy ddclient-3.9.0/ddclient to /usr/sbin/

6. scp /etc/default/ddclient to target server

7. copy /etc/default/ddclient to target server's /etc/default/ddclient

8. apt-get install libdata-validate-ip-perl
   apt-get install libjson-any-perl

Remark: Need to use "systemctl start ddclient.service" to start the service