Env_file property
The Compose env_file property specifies a file containing environment-variable definitions to load into a service.
Learn Docker in a Month of Lunches, Second Edition
The Compose env_file property specifies a text file whose key/value lines are loaded into a service container as environment variables.
- How it is used
- Injects shared application configuration into service containers through a referenced text file.
- How deep it goes
- Explains the property, key=value parsing, sharing rationale, and log-based verification, but not file syntax beyond lines and equals signs.
- Examples
- Uses logging.debug.env and logging.information.env in todo-web development and Compose configurations.
- What you can do after
- Operate/configure a Compose service with externalized environment variables and verify their effect through container logs.
Read how Learn Docker in a Month of Lunches, Second Edition explains env_file property →
Build Financial Software with Generative AI (From Scratch)
An env_file directive is a Docker Compose configuration directive that loads environment variables from a specified file into a service.
- How it is used
- Loads service environment variables from a named file, replacing hardcoded credentials and other configuration values.
- How deep it goes
- Explains directive purpose, naming choices, source-control handling, documentation, and application retrieval without detailing broader Compose behavior.
- Examples
- Uses .sql_server.conf, .env, webapp.env, PostgreSQL variables, and a postgres service configuration.
- What you can do after
- Operate/configure a Compose service by moving credentials into an environment file and reading them through application environment variables.
Read how Build Financial Software with Generative AI (From Scratch) explains env_file property →
Related concepts
- .env fileuses · A .env file is a plain-text configuration file containing environment-variable assignments that applications or tools can load at runtime.
- environment variableproduces · An environment variable is a named value supplied through an operating-system or process environment and made available to programs for runtime configuration or information.
- Dockerused by · Docker is a platform and ecosystem for building, distributing, and running applications in containers.
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