How can certain Docker containers used by COYO be accessed?
On page 4 of the document "COYO System Architecture & Technology Stack", you can find the individual ports via which you can access certain Docker containers used by COYO.
How is communication controlled between the Docker containers?
If you link one Docker container to another, it can access all of the ports of the linked container. Otherwise, the host system itself exclusively offers access to the ports that have been explicitly released.