I ran into some issue with symfony install within docker. I would like to create a docker image, that automaticly install symfony and runs it. I’m using docker-compose. Here is my docker-compose.yml file:
version: "3"
networks:
nginx-php81-mysql8-node:
services:
# nginx
nginx-service:
image: nginx:stable-alpine
container_name: nginx-container
ports:
- "8080:80"
volumes:
- ./app:/var/www/html
- ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
depends_on:
- php81-service
- mysql8-service
# php
php81-service:
build:
context: .
dockerfile: docker/php/Dockerfile
container_name: php81-container
ports:
- "8000:8000"
volumes:
- ./app:/var/www/html
- ./docker/php/conf.d/xdebug.ini:/usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
- ./docker/php/conf.d/error_reporting.ini:/usr/local/etc/php/conf.d/error_reporting.ini
Here is my Dockerfile:
FROM php:8.1-fpm
WORKDIR /var/www/html
RUN apt-get update && apt-get install -y zlib1g-dev g++ git libicu-dev zip libzip-dev zip
&& docker-php-ext-install intl opcache pdo pdo_mysql
&& pecl install apcu
&& docker-php-ext-enable apcu
&& docker-php-ext-configure zip
&& docker-php-ext-install zip
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
RUN curl -sS https://get.symfony.com/cli/installer | bash
RUN mv /root/.symfony5/bin/symfony /usr/local/bin/symfony
RUN composer create-project symfony/skeleton:^6.3 .
RUN pecl install xdebug
&& docker-php-ext-enable xdebug
RUN touch /var/log/xdebug.log &&
chmod 777 /var/log/xdebug.log
The problem is, when my image is building, I can see that is creating the symfony project, I can’t see any error in the process. But, when I enter the container, my /var/www/html folder is empty, there should be the files of the symfony project.
EDIT
Okey now I know what is the problem. Because I mount my local app folder to the container it is empty. When I run the container, my empty folder has benne mounted.
So, is there a way to install symfony inside the container and the same time map the folder to my local folder?
2
Answers
An alternative is create the symfony project outside the docker container, and then in your docker-compose mount the volume, specifying where is your symfony project and where you want to mount it inside de docker container.
I hope this could help you.
This is an issue with understanding the difference between Build Time and Run Time.
Your Dockerfile is a set of instructions that dictates your Image build. Volumes get mounted when your Container runs.
You’re installing your files into your Image’s working directory, and then when you run your image, you’re mounting an empty folder into that same directory, leading to…. an empty project.
A good example on how to get around this is to look at how some popular applications set up the installation process for their images at run time. They typically do this by creating an Entrypoint Script (which runs when the containers start), checking for the existence of certain key files, and then copying over the sources from a different directory into the working directory.
Here’s an example of how WordPress does it: https://github.com/docker-library/wordpress/tree/master/latest/php8.2/fpm-alpine
At build time, they install the code into
/usr/src/wordpressfrom their own repository: https://github.com/docker-library/wordpress/blob/master/latest/php8.2/fpm-alpine/Dockerfile#L100Then in their Entrypoint, they check for certain files and folders. If they don’t exist, they copy them into
/var/www/html: https://github.com/docker-library/wordpress/blob/master/latest/php8.2/fpm-alpine/docker-entrypoint.sh#L34tl;dr; Use ENTRYPOINTs to assist in handling your runtime needs inside your build.