Docker
Docker security
Docker security repository included books, blogs, video, tools and cases. here
Threat model
A docker threat model is an excellent way to close the security gaps, know what you've got, and understand what you're doing.
Container security
Ressource for Container Security / hardening including the full lifecycle here
Container Security Checklist here
Image security
An article on how to make your Docker image more secure here
Container training
Materials (slides, scripts, demo app, and other code samples) used for various workshops, tutorials, and training sessions around the themes of Docker, containers, and orchestration. here