CDC(Change Data Capture) is made up of two components, the CDD and the CDT. CDD is stand for Change Data Detection and CDT is stand for Change Data Transfer.
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/hduser/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
Warning: Permanently added '192.168.56.118' (ECDSA) to the list of known hosts.
hduser@192.168.56.118: Permission denied (publickey).