Question

What is the directive within a Dockerfile that creates a mount point inside instantiated containers that can be used to mount external volumes?

A) COPY

B) VOLUME

C) ADD

D) RUN

Answer 1

The directive in a Dockerfile that creates a mount point for mounting external volumes is VOLUME. It designates a directory within a container that can be used to access external data.

Step-by-step explanation:

The directive within a Dockerfile that creates a mount point inside instantiated containers for mounting external volumes is VOLUME. The VOLUME instruction creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers. For example, to create a volume within a container, you might see a line in a Dockerfile like VOLUME /myvol. This does not mount the volume but instead signals to Docker that the specified directory should be treated as a mount point.