Dockerfiles

Question 1

Dockerfile FROM does

Answer 1

Required. Indicates the base image to start from.

Question 2

Docker ENV

Answer 2

Sets environmental variables. Often includes the version in the image

Question 3

Dockerfile processing order

Answer 3

Every command adds an image layer on top, so order matters!

Question 4

Dockerfile RUN

Answer 4

Includes CLI commands to run

Use && syntax to add commands without adding a layer

Question 5

Dockerfile EXPOSE

Answer 5

The ports that should be open

Question 6

CMD

Answer 6

Required, the final command that runs when starting the container.

Question 7

WORKDIR

Answer 7

Sets the working directory

Preferred to RUN cd /path/

Question 8

COPY

Answer 8

Transfers a local file to the location

Question 9

Are ENVs inherited from upstream images?

Answer 9

No.