Compose supports declaring default environment variables in an environment file named
.env placed in the folder where the
docker-compose command is executed (current working directory).
These syntax rules apply to the
envfile to be in
#(i.e. comments) are ignored.
Values present in the environment at runtime will always override those defined inside the
.envfile. Similarly, values passed via command-line arguments take precedence as well.
Environment variables defined in the
.envfile are not automatically visible inside containers. To set container-applicable environment variables, follow the guidelines in the topic Environment variables in Compose, which describes how to pass shell environment variables through to containers, define environment variables in Compose files, and more.
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