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Update build.md 

Explicitly stated that you must add --build-arg for each build argument.
Added multiple arguments to example of `--build-arg` usage.
Fix for https://github.com/docker/docker.github.io/issues/6248

Signed-off-by: Preston Cowley <cowlinator@gmail.com>
This commit is contained in:
Preston Cowley 2018-03-26 14:28:49 -07:00
parent d3efe30878
commit ad44e2d45e
1 changed files with 2 additions and 2 deletions
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docs/reference/commandline/build.md
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@ -411,13 +411,13 @@ files. The `ARG` instruction lets Dockerfile authors define values that users
can set at build-time using the `--build-arg` flag: can set at build-time using the `--build-arg` flag:
```bash ```bash
$ docker build --build-arg HTTP_PROXY=http://10.20.30.2:1234 . $ docker build --build-arg HTTP_PROXY=http://10.20.30.2:1234 --build-arg FTP_PROXY=http://40.50.60.5:4567 .
``` ```
This flag allows you to pass the build-time variables that are This flag allows you to pass the build-time variables that are
accessed like regular environment variables in the `RUN` instruction of the accessed like regular environment variables in the `RUN` instruction of the
Dockerfile. Also, these values don't persist in the intermediate or final images Dockerfile. Also, these values don't persist in the intermediate or final images
like `ENV` values do. like `ENV` values do. You must add `--build-arg` for each build argument.
Using this flag will not alter the output you see when the `ARG` lines from the Using this flag will not alter the output you see when the `ARG` lines from the
Dockerfile are echoed during the build process. Dockerfile are echoed during the build process.