How to get Docker Containers to talk to each other on CIS-hardened Ubuntu 18.04

TL/DR: iptables rules are dropping the packets! The setup We’re preparing to go through an ISO 27001 security audit at work.One requirement is to ensure that all operating systems are locked down. We chose to follow the Center for Internet Security (CIS) Level 1 benchmark for Ubuntu. Conveniently, Microsoft Azure has pre-configured CIS images, but […]