Red Hat Training
A Red Hat training course is available for Red Hat Enterprise Linux
Chapter 2. Building Containers
It is necessary to maintain a mechanism that permits you to update your containers, so that they can be patched when security vulnerabilities that apply to those containers are discovered. An understanding of how containers are built helps maintain them properly.
To minimize the risk of having security vulnerabilities in your containers, you need to make it possible to update your containers so that you can apply security patches to them. To make your containers reliably updateable you need to leverage as much of the existing packaging infrastructure and tooling as possible. This means that you will have to use Yum. In this respect, running containers is no different than running any other distribution. All the rules that you’re familiar with apply: you should use RPM if you can.