These provide curated Docker images intended to be the default, go-to versions of a container for a particular project or application (e.g. Nginx, Ubuntu, MySQL).

MySQL is also available as a Docker image. Many of the most common options in MySQL can be changed by passing command-line flags to the container.

In this How to Make Tech Work tutorial, Jack Wallen shows how to create a Docker volume that can be used for any number of containers.