Docker – Why is the Docker Symfony project with Composer consuming so much memory

composerdockerdocker-composesymfony

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

Best Answer

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)

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