How to install PHP composer inside a docker container

Question

I try to work out a way to create a dev environment using docker and laravel.

I have the following dockerfile:

FROM php:7.1.3-fpm  RUN apt-get update && apt-get install -y libmcrypt-dev \     mysql-client libmagickwand-dev --no-install-recommends \     && pecl install imagick \     && docker-php-ext-enable imagick \ && docker-php-ext-install mcrypt pdo_mysql && chmod -R o+rw laravel-master/bootstrap laravel-master/storage 

Laravel requires composer to call composer dump-autoload when working with database migration. Therefore, I need composer inside the docker container.

I tried:

RUN curl -sS https://getcomposer.org/installer | php -- \ --install-dir=/usr/bin --filename=composer 

But when I call

docker-compose up docker-compose exec app composer dump-autoload 

It throws the following error:

rpc error: code = 13 desc = invalid header field value "oci runtime error: exec failed: container_linux.go:247: starting container process caused \"exec: \\\"composer\\\": executable file not found in $PATH\"\n" 

I would be more than happy for advice how I can add composer to the PATH within my dockerfile or what else I can do to surpass this error.

Thanks for your support. Also: this is the gitub repository if you need to see the docker-compose.yml file or anything else.

Answer 1

In Dockerfile :

COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer