Computer scienceSystem administration and DevOpsDockerBuilding images with Dockerfile

Dockerfile (COPY, ADD, ENV, ARG)

ENV variables in practice

Report a typo

Your working directory contains a Dockerfile and a demo.txt file.

FROM ubuntu:22.04
 
LABEL author=HyperUser 

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

ENTRYPOINT ["ls", "/tmp"]

What will happen when you run docker build -t ubuntu:v1 . command?

Select one option from the list

The demo.txt file will be copied to /tmp directory.

Copying will fail because you don't have a file named HOST_FILE to copy to the image.

Copying will fail because ENV variable declarations are wrong.

Docker will build the image successfully.

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