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Clarify environment and env_file docs 

Add note to say that environment variables will not be automatically
made available at build time, and point to the `args` documentation.

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
This commit is contained in:
Aanand Prasad 2016-07-20 12:23:51 +01:00
parent e1b7510e4a
commit 4fb7033d9c
1 changed files with 10 additions and 0 deletions
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docs/compose-file.md
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@ -274,6 +274,11 @@ beginning with `#` (i.e. comments) are ignored, as are blank lines.
# Set Rails/Rack environment
RACK_ENV=development
> **Note:** If your service specifies a [build](#build) option, variables
> defined in environment files will _not_ be automatically visible during the
> build. Use the [args](#args) sub-option of `build` to define build-time
> environment variables.
### environment
Add environment variables. You can use either an array or a dictionary. Any
@ -293,6 +298,11 @@ machine Compose is running on, which can be helpful for secret or host-specific
- SHOW=true
- SESSION_SECRET
> **Note:** If your service specifies a [build](#build) option, variables
> defined in `environment` will _not_ be automatically visible during the
> build. Use the [args](#args) sub-option of `build` to define build-time
> environment variables.
### expose
Expose ports without publishing them to the host machine - they'll only be