Laravel won't connect to database server that set in .env file

Question

I started a new Laravel 9.x + JsonApi project on docker-compose with 2 containters, 'web' and 'mysql'. Artisan migrations, seeding and db:show works fine. But when I'm trying to load a page from browser or Postman, it returns DB error

`SQLSTATE[HY000] [2002] php.network_getaddresses: getaddrinfo for mariadb failed: Temporary failure in name resolution

select * from redirects where redirects . id = 1 limit 1 `

The weird part is that my DB host is mysql and 'mariadb' string is never mentioned in my code (except some vendor files), nor in docker files, nor in.env file. I also checked container environment variables - nothing there.

Artisan scripts work fine.

Here are my settings, if it helps. Mariadb was never mentioned, it was mysql from the very beginning.

docker-compose.yml

version: "3.4"
services:
  mysql:
    image: mysql
    volumes: 
      - mysql_db:/var/lib/mysql
    ports:
      - 3306:3306
    environment:
      - MYSQL_ROOT_PASSWORD=***
      - MYSQL_DATABASE=url_shortener
  web:
    build:
      dockerfile: Dockerfile.web.dev
      context: .
    #image: php:alpine
    volumes:
      - "./:/app"
      - "/app/src/vendor"
      - web_root_home:/root
    working_dir: /app/src/
    command: "php artisan serve --host=0.0.0.0 --port=7999"
    ports:
      - 8000:7999
    depends_on:
      - mysql
volumes:
  mysql_db:
  web_root_home:

Dockerfile.web.dev

#FROM php
FROM bitnami/laravel
WORKDIR /app/src/
COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer
ENV COMPOSER_ALLOW_SUPERUSER=1
RUN apt update
RUN apt install -y git build-essential vim mc mlocate
RUN pecl install xdebug
COPY ./src /app/src
COPY ./src/composer.json ./
COPY ./src/.env ./
RUN composer install
RUN php artisan key:generate

CMD ["php", "artisan", "serve", "--host=0.0.0.0", "--port=8000"]

.env (DB part)

DB_CONNECTION=mysql
DB_HOST=mysql
DB_PORT=3306
DB_DATABASE=url_shortener
DB_USERNAME=root
DB_PASSWORD=***

app/config/database.php wasn't changed

artisan db:show

root@a3c873713ee1:/app/src# php artisan db:show

  MySQL 8 ...................................................................
  Database .................................................... url_shortener
  Host ................................................................ mysql
  Port ................................................................. 3306
  Username ............................................................. root
  URL .......................................................................
  Open Connections ........................................................ 3
  Tables .................................................................. 6
  Total Size ........................................................ 0.09MiB

  Table .......................................................... Size (MiB)
  redirects ............................................................ 0.02
  failed_jobs .......................................................... 0.02
  migrations ........................................................... 0.02
  personal_access_tokens ............................................... 0.02
  password_resets ...................................................... 0.02
  users ................................................................ 0.02

migrations and seeding works fine, I can connect to mysql from the host laptop. All seeds data are there

I tried to clear config cache, didn't help

root@a3c873713ee1:/app/src# php artisan config:clear

   INFO  Configuration cache cleared successfully.

I also reloaded containers, no luck as well

Stack trace isn't useful error screenshot

I'm out of ideas what to try and where it takes this mariadb host at all.

Answer 1

I could solve the problem by defining the DATABASE_URL=mysql://root:PASSWORD@mysql/url_shortener in my.env file. Still no idea where it got mariadb host from.