Persist Symfony upgrade in Docker container - php

Question

I have a PHP-based Docker container with Composer and Symfony installed inside of it. But each time I start that container, a message from Symfony appears, proposing to download & install the last version (and to activate TLS), which I do (for both). So I think the upgrade doesn't persist, how can I solve this ? (thank you in advance)
Thank you for your answers, everyone. The docker-composer.yaml and php/Dockerfile are made from a French tutorial video, slightly modified due to improvements noted in the Youtube comment section: The video is called "Un environnement de développement Symfony 5 avec Docker et Docker-compose" from Yoandev Co. Here is the docker-compose.yaml :
version: "3.8"
services:
db:
image: mariadb
container_name: db_SF_tuto_2
restart: always
volumes:
- db-data2:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: admin
MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
networks:
- dev2
phpmyadmin:
image: phpmyadmin
container_name: phpmyadmin_SF_tuto_2
restart: always
depends_on:
- db
ports:
- 8090:80
environment:
PMA_HOST: db
networks:
- dev2
maildev:
image: maildev/maildev
container_name: maildev_SF_tuto_2
command: bin/maildev --web 80 --smtp 25 --hide-extensions STARTTLS
ports:
- "8091:80"
restart: always
networks:
- dev2
www:
build: php
container_name: www_SF_tuto_2
ports:
- "8742:8000"
volumes:
- ./php/vhosts:/etc/apache2/sites-enabled
- ./:/var/www
restart: always
networks:
- dev2
networks:
dev2:
volumes:
db-data2:
… and php/Dockerfile :
FROM php:7.4-apache
RUN echo "ServerName localhost" >> /etc/apache2/apache2.conf \
\
&& apt-get update \
&& apt-get install -y --no-install-recommends \
locales apt-utils git libicu-dev g++ libpng-dev libxml2-dev libzip-dev libonig-dev libxslt-dev unzip \
\
&& echo "en_US.UTF-8 UTF-8" > /etc/locale.gen \
&& echo "fr_FR.UTF-8 UTF-8" >> /etc/locale.gen \
&& locale-gen \
\
&& curl -sS https://getcomposer.org/installer | php -- \
&& mv composer.phar /usr/local/bin/composer \
\
&& curl -sS https://get.symfony.com/cli/installer | bash \
&& mv /root/.symfony/bin/symfony /usr/local/bin \
\
&& docker-php-ext-configure \
intl \
&& docker-php-ext-install \
pdo_mysql gd opcache intl zip calendar xsl \
\
&& pecl install apcu && docker-php-ext-enable apcu
WORKDIR /var/www/

Answer 1

As you have discovered, container storage is temporary and any changes done in it will be discarded when the container is removed. Note that you can stop a running container and the changes will still be there the next time you launch it, but docker-compose down does remove it, so every time you boot up your symfony binary is being reloaded from the image.
If you want for the updates to persist you'll have to create a volume.
However, since your current installation directory already contains binaries from your base image I'd suggest installing to a different directory and mount that.
In your Dockerfile, change the installation target. Since its a new directory you need to add it to the current $PATH so the tools can be executed.
FROM php:7.4-apache
RUN echo "ServerName localhost" >> /etc/apache2/apache2.conf \
\
&& apt-get update \
&& apt-get install -y --no-install-recommends \
locales apt-utils git libicu-dev g++ libpng-dev libxml2-dev libzip-dev libonig-dev libxslt-dev unzip \
&& echo "en_US.UTF-8 UTF-8" > /etc/locale.gen \
&& echo "fr_FR.UTF-8 UTF-8" >> /etc/locale.gen \
&& locale-gen \
\
&& mkdir /opt/bin -p \
&& curl -sS https://getcomposer.org/installer | php -- --install-dir /opt/bin --filename composer \
&& curl -sS https://get.symfony.com/cli/installer | bash -s - --install-dir /opt/bin \
\
&& docker-php-ext-configure \
intl \
&& docker-php-ext-install \
pdo_mysql gd opcache intl zip calendar xsl \
\
&& pecl install apcu && docker-php-ext-enable apcu
ENV PATH /opt/bin:$PATH
WORKDIR /var/www/
Now specify where to map the volume in the docker-compose.yml file:
www:
# ...
volumes:
# Specify the mount point.
# If you use short syntax here, a volume will be created every restart.
- phptools:/opt/bin
volumes:
# Declare a named volume so it can be remounted
phptools:
Run docker-compose build and docker-compose up.