Passing build arguments to Dockerfile and converting them as environment variables

Imagine you are building a dockerfile and you need to control the build process using an ENV variable which you pass from outside during the build process.

In our case, the variable is MODE. MODE can have 2 values DEV and PROD. By Default we need the value to be DEV

The dockerfile for thesame is given belwo

Dockerfile

ARG MODE=DEV
ENV MODE=$MODE

Now to pass the value during build process use the

docker build --build-arg MODE=PROD -t test-docker-image .