hubgit/docker-env-arg.md

Last active February 4, 2019 13:27

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Sources of variables in docker-compose.yml, Dockerfile, and the applications they start

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docker-env-arg.md

Used in docker-compose.yml

environment variables in the shell where docker-compose is run
values set in an .env file in the folder where docker-compose is run

Used in Dockerfile

build args set in docker-compose.yml (build > args, object) and imported with ARG in Dockerfile
values set with ARG in Dockerfile

Used in the app (environment variables in Dockerfile)

values set in the file linked to by env_file in docker-compose.yml
values set in the environment array in docker-compose.yml
values set with ENV in Dockerfile

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