How do I install composer in container of docker? - laravel

Question

I am new at docker and docker-compose and I am developing a Laravel-project on docker and docker-compose with Laradock as following a tutorial(not sure whether It is a correct way or not to refer this situation though).
I want to install the composer in this environment to be able to use the composer command.
As a matter of fact, I wanted to do seeding to put data into DB that I made by php artisan make:migrate but this error appeared.
include(/var/www/laravel_practice/vendor/composer/../../database/seeds/AdminsTableSeeder.php): failed to open stream: No such file or directory
So I googled this script to find a solution that will solve the error then I found it.
It says, "Do composer dump-autoload and try seeding again", so I followed it then this error appeared.
bash: composer: command not found
Because I have not installed composer into docker-container.
My docker's condition is like this now.
・workspace
・mysql
・apache
・php-fpm
Since I have not installed the composer, I have to install it into docker-container to solve the problem, BUT I have no idea how to install it into docker-container.
So could anyone tell me how to install composer into docker-container?
Thank you.
here is the laradock/mysql/Dockerfile and laravelProject/docker-compose.yml.
ARG MYSQL_VERSION=5.7
FROM mysql:${MYSQL_VERSION}
LABEL maintainer="Mahmoud Zalt <mahmoud#zalt.me>"
#####################################
# Set Timezone
#####################################
ARG TZ=UTC
ENV TZ ${TZ}
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && chown -R mysql:root /var/lib/mysql/
COPY my.cnf /etc/mysql/conf.d/my.cnf
CMD ["mysqld"]
EXPOSE 3306
version: '2'
services:
db:
image: mysql:5.7
ports:
- "6603:3306"
environment:
- MYSQL_ALLOW_EMPTY_PASSWORD=true
- MYSQL_DATABASE=laravelProject
- LANG=C.UTF-8
volumes:
- db:/var/lib/mysql
command: mysqld --sql-mode=NO_ENGINE_SUBSTITUTION --character-set-server=utf8 --collation-server=utf8_unicode_ci
web:
image: arbiedev/php-nginx:7.1.8
ports:
- "8080:80"
volumes:
- ./www:/var/www
- ./nginx.conf:/etc/nginx/sites-enabled/default
volumes:
db:

Answer 1

You can build your own image and use it in your Docker compose file.
FROM php:7.2-alpine3.8
RUN apk update
RUN apk add bash
RUN apk add curl
# INSTALL COMPOSER
RUN curl -s https://getcomposer.org/installer | php
RUN alias composer='php composer.phar'
# INSTALL NGINX
RUN apk add nginx
I used the PHP alpine image as my base image because it's lightweight, so you might have to install other dependencies yourself. In your docker-compose file
web:
build: path/to/your/Dockerfile/directory
image: your-image-tag
ports:
- "8080:80"
volumes:
- ./www:/var/www
- ./nginx.conf:/etc/nginx/sites-enabled/default

Answer 2

You could do something like this:
FROM php:8.0.2-apache
RUN apt-get update && apt-get upgrade -y
RUN apt-get install -y mariadb-client libxml2-dev
RUN apt-get autoremove -y && apt-get autoclean
RUN docker-php-ext-install mysqli pdo pdo_mysql xml
COPY --from=composer /usr/bin/composer /usr/bin/composer
the argument COPY --from= should solve your problem.

Answer 3

FROM php:7.3-fpm-alpine
RUN docker-php-ext-install pdo pdo_mysql
RUN docker-php-ext-install mysqli && docker-php-ext-enable mysqli
RUN php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer
RUN apk update
RUN apk upgrade
RUN apk add bash
RUN alias composer='php /usr/bin/composer'