I'm running my project on a PHP-FPM docker container (config file details below). When I build the container and try to run Composer, I get an error reporting that the PHP extension is missing. However, I think my build file covers these extensions (seedocker/php-fpm/Dockerfilebelow).

It turns out that the container was built with php8.2 as the default version. I've been able to change the symlink to set the default version back to php8.1 but this doesn't seem to be the right solution. Can anyone suggest a better solution?

How do I know the container is running 8.2: Inside the container I runphp --versionand get:

root@fee8cc9ff790:/application# php --version PHP 8.2.0 (cli) (built: Dec 8 2022 13:56:08) (NTS)

Thenwhich phpgave me:

root@fee8cc9ff790:/application# which php /usr/bin/php

I followed the symlink to the PHP binary linked in/etc/alternatives:

phar -> /usr/bin/phar8.2 phar.phar -> /usr/bin/phar.phar8.2 php -> /usr/bin/php8.2 phpdbg -> /usr/bin/phpdbg8.2

This doesn't seem right to me. I was able to relink them to their 8.1 versions and everything seems to be running fine now, but what happens when I rebuild the container?

My file details:

docker-compose.yml

############################################################################### # Generated on docker.io # ############################################################################### version: '3.9' services: mailhog: image: 'mailhog/mailhog:latest' redis: image: 'redis:alpine' mysql: image: 'mysql:8.0.27' working_dir: /application platform: linux/amd64 environment: - MYSQL_ROOT_PASSWORD= - MYSQL_DATABASE= - MYSQL_USER= - MYSQL_PASSWORD= webserver: image: 'nginx:alpine' working_dir: /application volumes: - '.:/application' - './docker/nginx/nginx.conf:/etc/nginx/conf.d/default.conf' php-fpm: build: docker/php-fpm working_dir: /application/ volumes: - '.:/application' - './docker/php-fpm/php-ini-overrides.ini:/etc/php/8.1/fpm/conf.d/99-overrides.ini' - './docker/php-fpm/php-ini-overrides.ini:/etc/php/8.1/cli/conf.d/99-overrides.ini'

docker-compose.override.yml

############################################################################### # Generated on phpdocker.io # ############################################################################### version: '3.9' services: mailhog: ports: - '8026:8025' mysql: ports: - '33061:3306' webserver: ports: - '801:80'

docker/php-fpm/Dockerfile

FROM phpdockerio/php:8.1-fpm WORKDIR "/application" RUN apt-get update; apt-get -y --no-install-recommends install git php-xdebug php8.1-mysql php8.1-sqlite mysql-client php8.1-redis; apt-get clea n; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/*