Computer scienceSystem administration and DevOpsDockerBuilding images with Dockerfile

Dockerfile (COPY, ADD, ENV, ARG)

ARG variables in practice

Report a typo

You have the following Dockerfile.

ARG VERSION
FROM ubuntu:$VERSION
 
LABEL author=HyperUser 

ENV $HOST_FILE=demo.txt
ENV IMAGE_DESTINATION="/tmp"
COPY $HOST_FILE $IMAGE_DESTINATION

ENTRYPOINT ["ls", "/tmp"]

What will happen if you build an image with this command?

$ docker build -t ubuntu:v1 .

Select one option from the list

Build will fail due to incorrect ENV variable format inside the Dockerfile.

Build will fail because you didn't pass the ARG variable in the build command.

Docker will build the image with the latest Ubuntu image.

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