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dockertopia 2022-08-29 10:41:43 +01:00
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compose/envvars-precedence.md
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@ -8,7 +8,7 @@ keywords: compose, environment, env file
1. Passed from the command-line [`docker compose run --env <KEY[=[VAL]]>`](../../engine/reference/commandline/compose_run/#options).
2. Passed from/set in `compose.yaml` service's configuration, from the [environment key](../../compose/compose-file/#environment).
3. Passed from/set in `compose.yaml` service's configuration, from the [env_file key](../../compose/compose-file/#env_file).
4. Passed from/set in Container Image in [ENV directive](../../engine/reference/builder/#env).
4. Passed from/set in Container Image in the [ENV directive](../../engine/reference/builder/#env).
### Precedence quick overview table
The table below provides a quick overview of how interpolation works when using all environment variables on Compose, using `TAG`, an environmental variable defining the version for an image, as an example.