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Use binary-only images for installing Composer (#11170) 

Document optimal way of copying Composer binary using `COPY --from` in Dockerfiles by using binary-only image.
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Grzegorz Korba 2022-11-03 21:50:22 +01:00 committed by GitHub
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@ -173,17 +173,21 @@ docker pull composer/composer
docker run --rm -it -v "$(pwd):/app" composer/composer install docker run --rm -it -v "$(pwd):/app" composer/composer install
``` ```
To add Composer to an existing **Dockerfile**: To add Composer to an existing **Dockerfile** you can simply copy binary file from pre-built, low-size images:
```Dockerfile ```Dockerfile
COPY --from=composer/composer /usr/bin/composer /usr/bin/composer # Latest release
COPY --from=composer/composer:latest-bin /composer /usr/bin/composer
# Specific release
COPY --from=composer/composer:2-bin /composer /usr/bin/composer
``` ```
Read the [image description](https://hub.docker.com/r/composer/composer) for further usage information. Read the [image description](https://hub.docker.com/r/composer/composer) for further usage information.
**Note:** Docker specific issues should be filed [on the composer/docker repository](https://github.com/composer/docker/issues). **Note:** Docker specific issues should be filed [on the composer/docker repository](https://github.com/composer/docker/issues).
**Note:** You may also use `composer` instead of `composer/composer` as image name above. It is shorter and is a Docker official image but is not published directly by us and thus usually receives new releases with a delay of a few days. **Note:** You may also use `composer` instead of `composer/composer` as image name above. It is shorter and is a Docker official image but is not published directly by us and thus usually receives new releases with a delay of a few days. **Important**: short-aliased images don't have binary-only equivalents, so for `COPY --from` approach it's better to use `composer/composer` ones.
## Using Composer ## Using Composer