Multiple database systems seems not to work

Build Environment Databases
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1

Hello,

I have a monolithic repository which is compound of two Symfony application, one uses a Postgresql database, the other one uses Mysql.

When I tried to setup databases schema through steps, it’ works for the Postgresql, but it didn’t work for Mysql, I got the error An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or dir ectory, I conclude that my php image couldn’t connect to the mysql server.

This is my config.yml

version: 2
jobs:
  build:
    working_directory: /app/acme
    docker:
      - image: studapart/php
        environment:
          SYMFONY_ENV: test
          SYMFONY_DEBUG: false
          POSTGRESQL_ADDON_HOST: localhost
          POSTGRESQL_ADDON_DB: studapart_test
          POSTGRESQL_ADDON_USER: studapart
          POSTGRESQL_ADDON_PORT: 5432
          MYSQL_ADDON_HOST: localhost
          MYSQL_ADDON_PORT: 3306
          MYSQL_ADDON_DB: pro_test
          MYSQL_ADDON_USER: studapart
          MYSQL_ADDON_PASSWORD: studapartpwd
          BEHAT_SCREENSHOT_DIR: /tmp/behat/screenshots
      - image: circleci/postgres:9.5.6-alpine
        environment:
          PGDATA: /dev/shm/pgdata/data
          POSTGRES_USER: studapart
          POSTGRES_DB: studapart_test
          POSTGRES_PASSWORD: studapartpwd
      - image: circleci/mysql:5.6
        environment:
          MYSQL_PORT: 3306
          MYSQL_USER: studapart
          MYSQL_DATABASE: pro_test
          MYSQL_PASSWORD: studapartpwd
...
    steps:
...
      - run:
          name: Install db
          command: |
            cd back # The application using Postgresql
            bin/console doctrine:database:create -n --if-not-exists # No problem
            bin/console doctrine:schema:drop --force --full-database -vvv # No problem
            bin/console doc:mig:mig --no-interaction # No problem
            cd ../pro # The application using Mysql
            bin/console doctrine:database:create -n --if-not-exists # Error : No such file or directory
            bin/console doctrine:schema:drop --force --full-database -vvv
            cat codeigniter/fixtures/schema.sql | docker exec -i acme_mysql_1 mysql --user=studapart --password=studapartpwd pro_test
            bin/console doc:mig:mig --no-interaction