mirror of https://github.com/docker/compose.git
44 lines
1.3 KiB
Markdown
44 lines
1.3 KiB
Markdown
<!--[metadata]>
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+++
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title = "Environment file"
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description = "Declaring default environment variables in file"
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keywords = ["fig, composition, compose, docker, orchestration, environment, env file"]
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[menu.main]
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parent = "workw_compose"
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weight=10
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+++
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<![end-metadata]-->
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# Environment file
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Compose supports declaring default environment variables in an environment
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file named `.env` placed in the folder `docker-compose` command is executed from
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*(current working directory)*.
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Compose expects each line in an env file to be in `VAR=VAL` format. Lines
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beginning with `#` (i.e. comments) are ignored, as are blank lines.
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> Note: Values present in the environment at runtime will always override
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> those defined inside the `.env` file. Similarly, values passed via
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> command-line arguments take precedence as well.
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Those environment variables will be used for
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[variable substitution](compose-file.md#variable-substitution) in your Compose
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file, but can also be used to define the following
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[CLI variables](reference/envvars.md):
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- `COMPOSE_API_VERSION`
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- `COMPOSE_FILE`
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- `COMPOSE_HTTP_TIMEOUT`
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- `COMPOSE_PROJECT_NAME`
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- `DOCKER_CERT_PATH`
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- `DOCKER_HOST`
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- `DOCKER_TLS_VERIFY`
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## More Compose documentation
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- [User guide](index.md)
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- [Command line reference](./reference/index.md)
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- [Compose file reference](compose-file.md)
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