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

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. I still have no idea where it got mariaDB host from.