Symfony, Docker container fpm, apache : could not find driver [doctrine:database:create]

I’m trying to create symfony 5.4 project using docker with a container for apache, php fpm, symfony, mysql db. but actualy i don’t succed to create my database, i get this error:

In AbstractMySQLDriver.php line 128:
                                                          
  An exception occurred in driver: could not find driver  
                                                          

In Exception.php line 18:
                         
  could not find driver  
                         

In PDOConnection.php line 40:
                         
  could not find driver  

this doctrine conf : config/packages/doctrine.yaml:

doctrine:
    dbal:
        url: '%env(resolve:DATABASE_URL)%'
        
        # IMPORTANT: You MUST configure your server version,
        # either here or in the DATABASE_URL env var (see .env file)
        #server_version: '13'
    orm:
        auto_generate_proxy_classes: true
        naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
        auto_mapping: true
        mappings:
            App:
                is_bundle: false
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'AppEntity'
                alias: App

this is extensions activated :

;extension=bz2
extension=curl
;extension=ffi
;extension=ftp
;extension=fileinfo
extension=gd2
;extension=gettext
;extension=gmp
;extension=intl
;extension=imap
;extension=ldap
extension=mbstring
;extension=exif      ; Must be after mbstring as it depends on it
extension=mysqli
;extension=oci8_12c  ; Use with Oracle Database 12c Instant Client
;extension=odbc
;extension=openssl
;extension=pdo_firebird
extension=pdo_mysql
;extension=pdo_oci
;extension=pdo_odbc
;extension=pdo_pgsql
;extension=pdo_sqlite
;extension=pgsql
;extension=shmop

; The MIBS data available in the PHP distribution must be installed.
; See http://www.php.net/manual/en/snmp.installation.php
;extension=snmp

;extension=soap
extension=sockets
;extension=sodium
extension=sqlite3
;extension=tidy
;extension=xmlrpc

this my Docker-compose-stack-file:

version: '3.8'

services:
   myApp-back-apache:
    image: localhost:5000/apache
    working_dir: /var/www
    volumes:
      - type: bind
        source: myApp-back
        target: /var/www
     
    ports:
      - 8081:80
    environment:
      HTTPD_FPM_HOST: myApp-back-fpm
      HTTPD_FPM_PORT: 9000

  myApp-back-fpm:
    image: php:7.4-fpm
    working_dir: /var/www/html
    volumes:
      - type: bind
        source: myApp-back
        target: /var/www/html
  
  myApp-back-db:
    image: "mariadb:10.6.5"
    environment:  
      MYSQL_ROOT_USER: root
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: root
    volumes:
      - myApp-back-db:/var/lib/mysql
    ports:
      - "3309:3306"

volumes:
  myApp-back-db:
    external: true

and My file .env:

DATABASE_URL="mysql://root:root@127.0.0.1:3309/db_name?serverVersion=5.7&charset=utf8mb4"

Answer

1. Are you sure you are running php -m on the docker container and not your host?(quite common mistake)

2. In your symfony(fpm) docker container 127.0.0.1 and localhost resolve to the container itself, not your host machine which has the db exposed on port 3309. Try changing your DATABASE_URL to mysql://root:root@myApp-back-db:3306. Also, you can try setting url to host.docker.internal if you are on mac or windows.

3. Create a docker file for fpm and install mysql ext:

docker-composer:

myApp-back-fpm:
    build:
        context: .
    working_dir: /var/www/html
    volumes:
      - type: bind
        source: myApp-back
        target: /var/www/html

Dockerfile:

FROM php:7.4-fpm

RUN docker-php-ext-install pdo pdo_mysql;