Laravel with Docker issue connecting MySQL

Question

Steps I follow to setup Laravel using Docker: in my local system I don't have installed PHP, Composer, Apache, MySQL, phpMyAdmin, etc. I only have Git and Docker install in my system.

1. git clone https://github.com/laravel/laravel.git

2. create docker-composer.yml file on project root.

   version: "3"
   services:
     db:
     image: mysql:5.7
     environment:
       MYSQL_ROOT_PASSWORD: pass
       MYSQL_DATABASE: db
       MYSQL_USER: root
       MYSQL_PASSWORD: pass
     ports:
       - "3306:3306"
   
   web:
     image: php:7.2.2-apache
     container_name: web_laravel
     depends_on:
       - db
     volumes:
       - ./:/var/www/html/
     ports:
       - "4000:80"
     stdin_open: true
     tty: true
   
   phpmyadmin:
     image: phpmyadmin/phpmyadmin
     depends_on:
       - db
     external_links:
       - db:mysql
     ports:
       - "9191:80"
     environment:
       MYSQL_USER: root
       MYSQL_PASSWORD: pass
       MYSQL_ROOT_PASSWORD: pass
       PMA_HOST: db
   

3. run command from project root.

   docker-compose up
   

   This command will fetch all the images (php:7.2.2-apache, phpmyadmin/phpmyadmin, mysql:5.7) from local cache or Docker Hub and start three containers for these images.

   Now I need to interact with php:7.2.2-apache image's container called web_laravel (see in yml file) so I can add PHP extensions and Composer to run Laravel project.

4. run this command.

   docker exec -it web_laravel /bin/bash
   

   Now I have access to run any command in running web_laravel container so I've installed Composer and PHP extensions like mbstrings, pdo, pdo_mysql etc.

   Then install Laravel dependency using composer install, set permission for storage and bootstrap/cache folders and run php artisan key:generate.

   open localhost:4000 and I'm able to see Laravel home page:

   

At this point all is good. The problem starts now when I'm connecting to my DB.

Next command to run (I'm still within container):

  php artisan migrate

and the errors are:

 Illuminate\Database\QueryException  : SQLSTATE[HY000] [2002] No such file or directory (SQL: select * from information_schema.tables where table_schema = blog and table_name = migrations)

 Illuminate\Database\QueryException  : could not find driver (SQL: select * from information_schema.tables where table_schema = blog and table_name = migrations)

I'm able to open phpMyAdmin (http://localhost:9191) and can create DB, table and operations related DB. I've DB called blog.

MySQL env variables:

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=blog
DB_USERNAME=root
DB_PASSWORD=pass

Answer 1

I think you have a couple of issues, the first is that laravel .env configuration should point to the MySQL container, not localhost

DB_HOST=127.0.0.1

should be

DB_HOST=db

And the other error you talked about, is not related to Docker

Illuminate\Database\QueryException : SQLSTATE[HY000] [2002] No such file or directory (SQL: select * from information_schema.tables where table_schema = blog and table_name = migrations)

Illuminate\Database\QueryException : could not find driver (SQL: select * from information_schema.tables where table_schema = blog and table_name = migrations)

it's probably related to a missing dependency, you should run

composer require doctrine/dbal

Also, you said:

now I have access to run any command in running web_laravel container so I've installed composer and php extensions like mbstrings, pdo, pdo_mysql etc.

You should build your image on top of PHP 7/Apache image, and add those to the build dockerfile, because your changes (php extensions, configurations...etc) are not persistent. I would suggest you use Laradock or any other existing Laravel/docker environment.