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Given the following configuration:
mysql:
environment:
MY_MYSQL_PORT:
image: mysql
ports:
- "${MY_MYSQL_PORT}:3306"
There's a way to provide a fallback value for MY_MYSQL_PORT without relying on wrapper scripts? I already tested like bash ${MY_MYSQL_PORT-3306} but it doesn't work.
953
Docker Compose allows us to pass environment variables in via command line or to define them in our shell. However, it's best to keep these values inside the actual Compose file and out of the command line.
Overriding a single value in your docker-compose . env file is reasonably simple: just set an environment variable with the same name in your shell before running your docker-compose command.
Stops containers and removes containers, networks, volumes, and images created by up .
Fetch Using docker exec Command Here, we are executing the /usr/bin/env utility inside the Docker container. Using this utility, you can view all the environment variables set inside Docker containers.
They implemented that feature with compose 1.9 release:
Added support for shell-style inline defaults in variable interpolation.
The supported forms are ${FOO-default} (fall back if FOO is unset) and ${FOO:-default} (fall back if FOO is unset or empty).
Release Notes Docker Compose 1.9
143
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