Tag: arg

1. ARG is only available during build
2. ENV is available can be available during build as well as after the build

FROM httpd
ARG arg1
ENV env1=evalue1
ENV env2=${arg1}
ENV env3=evalue3

docker build --build-arg arg1=atest -t httpd-test .

docker run -d --env-file=env_file  httpd-test