Why is my Docker Symfony project with Composer consuming so much memory?

Question

Description

I'm deploying my symfony project in prod. It works fine when I simply run docker-compose up. However I'm getting an issue with my deploy script and try accessing the web page in my navigator.

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes) in /var/www/redaph/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php on line 107

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 65536 bytes) in /var/www/redaph/vendor/composer/ClassLoader.php on line 444

What is weird is that, in my dockerfile I specify that I want my PHP_MEMORY_LIMIT to be at 256M. When I enter my container I see the following:

root@125de315edca:/var/www/redaph# php -i | grep memory_limit memory_limit => 128M => 128M 

Question

Why is my Docker Symfony project consuming so much memory?

If this is normal then: How do I correctly increase the PHP_MEMORY_LIMIT in my dockerfile?

deploy_prod.sh

#!/usr/bin/env bash PROJECT=symfony docker-compose up -d docker exec redaph_symfony_1 php bin/console d:s:u --force docker exec redaph_symfony_1 php bin/console c:c 

Dockerfile:

FROM php:7.2-apache ENV \ APACHE_ADMIN_EMAIL=webmaster@localhost \ PHP_TIME_ZONE=Europe/London \ PHP_MEMORY_LIMIT=256M \ PHP_UPLOAD_MAX_FILESIZE=32M \ PHP_POST_MAX_SIZE=32M ARG WORK_DIR WORKDIR $WORK_DIR COPY composer.lock $WORK_DIR COPY composer.json $WORK_DIR ENV COMPOSER_ALLOW_SUPERUSER 1 RUN apt-get update \ && apt-get install -y -f apt-transport-https \ libicu-dev \ libfreetype6-dev \ libjpeg62-turbo-dev \ libpng-dev \ libpq-dev \ acl \ cron \ git \ zip \ && pecl install mongodb \ && docker-php-ext-enable mongodb \ && docker-php-ext-install \ exif \ gd \ intl \ opcache \ pdo_mysql \ pdo_pgsql \ zip \ && curl -sS https://getcomposer.org/installer | php \ && mv composer.phar /usr/local/bin/composer \ && composer install --no-dev --prefer-dist --optimize-autoloader --no-scripts \ && chown -R www-data:www-data $WORK_DIR \ && apt-get clean \ && rm -rf /var/lib/apt/lists/* \ && a2enmod rewrite \ && service cron start 

Answer 1

It's most likely that your docker image lacks writing permissions for folder where logs are stored which causes monolog to run out of memory (loops of errors).

Solution: Change permissions of the logs folder, or get info about "buffer_size":https://symfony.com/doc/2.0/reference/configuration/monolog.html (not sure if this will work with all handlers)