what does VOLUME command do in Dockerfile?

Question

I am having it difficulty in understanding added advantage of VOLUME(https://docs.docker.com/engine/reference/builder/#volume) .

In Dockerfile one can have mkdir to cre

Answer 1

A volume is very helpful when we don't want to lose data once the container is deleted. A configuration file, a database data, etc. Hence, you are able to use the same volume with a complete new docker container. If you only create a directory within the Dockefile, the data inside the folder will be deleted toghether with the container.