Connection error mariadb + wordpress with docker

Question

I have a docker-compose where I pick up two containers, one with mariadb and one with wordpress.

The problem

I receive a connection failure, apparently the user loses and cannot perform authentication.

wp-mysql | 2019-08-09 13:21:16 18 [Warning] Aborted connection 18 to db: > 'unconnected' user: 'unauthenticated' host: '172.31.0.3' (This connection > closed normally without authentication)

Situation

When I go to http: // localhost: 8010 the wordpress service is available, but with an error connecting to the database.

The docker-compose.yml ...

version: '3'

services:
  db:
    container_name: wp-mysql
    image: mariadb
    volumes:
       - $PWD/data:/var/lib/mysql
    environment:
       MYSQL_ROOT_PASSWORD: 12345678
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress
    ports:
       - "3307:3306"
    networks:
       - my_net
    restart: on-failure

  wp:
    depends_on:
       - db
    container_name: wp-web
    volumes:
       - "$PWD/html:/var/www/html"
    image: wordpress
    ports:
       - "8010:80"
    environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
    networks:
       - my_net

networks:
  my_net:

Error:

wp-mysql | 2019-08-09 13:21:16 18 [Warning] Aborted connection 18 to db: > 'unconnected' user: 'unauthenticated' host: '172.31.0.3' (This connection > closed normally without authentication)

Where is the configuration error?

Why can't the wordpress container not use the user created in the mariadb container environment?

Answer 1

Finally solve it.

After going around and helped by the user @JackNavaRow the solution came out.

It was as simple as rebooting the system and deleting the volumes.

Pick up the containers and everything worked ok.

I leave it here in case anyone encounters this problem, that does not give more turns.