Harden the firewalls of Docker host and Docker ubuntu containers by DC ADD list. Cyber attackers are the ultimate sources of the vulnerabilities of all computing systems. DC (DeepCyber) ADD (Attacker Details Dataset) is priceless, actionable and sustainable information for defending the computing systems of every commercial business and government agency. Using the ADD Black IP List (BIL), enterprises can block all types of access from the attackers' IPs to harden cybersecurity for more effective network and application defense