MySQL Docker doesn't allow connections from another container - mysql

Question

Since 2 hours I've got the problem that my MySQL container doesnt' allow connections from my laravel application (order). Every time I try to connect I get the following message (from laravel logs):
[2019-08-08 15:20:18] production.ERROR: SQLSTATE[HY000] [1045] Access
denied for user 'root'#'172.21.0.3' (using password: YES)
{"exception":"[object] (Doctrine\DBAL\Driver\PDOException(code:
1045): SQLSTATE[HY000] [1045] Access denied for user
'root'#'172.21.0.3' (using password: YES) at
/var/www/laravel/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:31,
PDOException(code: 1045): SQLSTATE[HY000] [1045] Access denied for
user 'root'#'172.21.0.3' (using password: YES) at
/var/www/laravel/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:27)
I've changed nothing in the configs or the DB. I just restarted all container with 'docker-compose restart'.
Here's my docker-compose file:
version: "2"
services:
nginx-proxy:
image: jwilder/nginx-proxy
container_name: nginx-proxy
restart: always
networks:
- webgateway
ports:
- "80:80"
- "443:443"
volumes:
- /var/run/docker.sock:/tmp/docker.sock:ro
- conf:/etc/nginx/conf.d
- vhost:/etc/nginx/vhost.d
- html:/usr/share/nginx/html
- dhparam:/etc/nginx/dhparam
- certs:/etc/nginx/certs
letsencrypt:
image: jrcs/letsencrypt-nginx-proxy-companion
container_name: nginx-proxy_le
volumes_from:
- nginx-proxy
volumes:
- /var/run/docker.sock:/var/run/docker.sock:ro
networks:
- webgateway
order:
container_name: order
image: e-order:latest
restart: always
volumes:
- /var/e-order/storage:/var/www/laravel/storage/app
- /var/e-order/logs:/var/www/laravel/storage/logs
networks:
- webgateway
- order_net
environment:
- VIRTUAL_HOST={URL}
- LETSENCRYPT_HOST={URL}
- LETSENCRYPT_EMAIL={MAIL}
- DB_HOST=order-db
- DB_USERNAME=root
- DB_PASSWORD={ROOT_PW}
- DB_DATABASE=e-order
- PHP_MEM_LIMIT=2048
env_file:
- /var/e-order/config/production.env
order-db:
image: mysql
container_name: order-db
restart: always
volumes:
- /var/e-order/database:/var/lib/mysql
networks:
- order_net
environment:
- MYSQL_DATABASE=e-order
- MYSQL_USER={USER}
- MYSQL_PASSWORD={PW}
- MYSQL_ROOT_PASSWORD={ROOT_PW}
networks:
webgateway:
order_net:
volumes:
conf:
vhost:
html:
dhparam:
certs:
An my production config file (linked with 'env_file'):
APP_NAME=e-order
APP_ENV=production
APP_DEBUG=false
APP_URL={URL}
MIX_ENV_MODE=production
DB_CONNECTION=mysql
BROADCAST_DRIVER=log
CACHE_DRIVER=file
QUEUE_CONNECTION=database
SESSION_DRIVER=database
SESSION_LIFETIME=120
TELESCOPE_HARDCORE=true
I've checked the configuration in the application the password which will be used to create the connection is correct and exactly as in the docker-compose file stated.
I'm able to connect directly on the mysql container when I connect to it with 'docker container exec -it order-db bash' and use the comment 'mysql -u root -p' and enter the root password as in the docker-compose file stated.
The host for the root user is set correctly. This is the way I've already checked that:
mysql> select user, host from mysql.user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| root | % |
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
7 rows in set (0.00 sec)
Privileges are also correct (I mean its the root use).
I've also checked the ip addresses. The appliaction was '172.21.0.3' and the db was '172.21.0.2' so they are in the same subnet the connection should be possible in my opinion.
Is there something locked in the mysql config? Or why isn't it working after just a quick restart.

Answer 1

I've downgraded the mysql version from 8.0 to 5.7 and now it's working like a charm. Not sure why but I'm in contact with the guy's from mysql to find a reason/solution.
Edit 18.05.2020:
A little edit after some time. I'm using the Maria DB Image since then and never had such problems.