Docker

Question 1

COPY command

Answer 1

copies from host file system to container filesystem

Question 2

where on the host do docker VOLUME mounts appear by default

Answer 2

On *NIX based systems, like here: /var/lib/docker/volumes/8e0b3a9d5c544b63a0bbaa788a250e6f4592d81c089f9221108379fd7e5ed017/_data/ - [https://blog.container-solutions.com/understanding-volumes-docker]