Composer memory limit docker - php

Question

I have a problem with composer install on docker. This is my docker-compose file:
version: '3'
services:
webserver:
image: nginx:latest
ports:
- 80:80
- 433:433
volumes:
- ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
- ./:/var/www/html/
links:
- php-fmp
- db
networks:
- app-network
php-fmp:
build: docker/php-fmp
volumes:
- ./:/var/www/html/
ports:
- 9000:9000
links:
- db
networks:
- app-network
db:
image: mysql
ports:
- 3306:3306
volumes:
- /var/lib/mysql
command: --default-authentication-plugin=mysql_native_password
restart: always
environment:
- MYSQL_DATABASE=goexpress
- MYSQL_USER=root
- MYSQL_PASSWORD=root
- MYSQL_ROOT_PASSWORD=docker
networks:
- app-network
networks:
app-network:
driver: bridge
I try to execute docker-compose run php-fmp composer install it starts after some minutes it shows memory limit xxxxxxxxx. I have tried also memory_limit=-1.
My laptop memory: 6GB.
In another pc it works perfect.
Before upgrade of memory it has worked. Memory before was 4GB now it is 6GB. The project that I want to run is symfony.

Answer 1

Composer has its own COMPOSER_MEMORY_LIMIT environment variable, but uses php.ini's memory_limit by default when its own variable is not set. https://getcomposer.org/doc/03-cli.md#composer-memory-limit
With Docker Compose you will need to pass COMPOSER_MEMORY_LIMIT as an environment variable to the container where Composer is installed. Your docker-compose.yml file would look like this:
services:
php-fmp: //the name of your container (as per your question)
environment:
- COMPOSER_MEMORY_LIMIT=-1 //-1 means unlimited
This environment variable would be taken into account every time you run Composer with docker-compose:
docker-compose exec php-fmp composer [your composer command]

Answer 2

Instead of php -d memory_limit=-1 composer install try COMPOSER_MEMORY_LIMIT=-1 composer install. Composer starts a new php process, that does not adhere to the setting you provide and it might even override the config (I'm not a 100% sure about that).
If that still does not help open the preferences for Docker (by clicking on the icon in the task bar) under the Advanced tab you can specify how many cores and how much memory docker is allowed to consume. I think the default is 2GB and you might want to change that to e.g. 4GB.