Issue getting docker to access my database properly with wordpress - mysql

Question

I'm new to docker all together - but am trying to setup a local test environment to play with some wordpress things.
So I went to the docker site and pulled up a default docker .yml file on how to get it going easily.
I've made just a couple changes, but mostly this is a straight forward document.
version: '3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql2
restart: always
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: somerootwordpresspw
MYSQL_DATABASE: testdatabase
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
volumes:
- ./WP-TEST/:/var/www/html/
depends_on:
- db
image: wordpress:latest
ports:
- "80:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data:
When I run docker-compose up with the above .yml file, I see this error:
MySQL "CREATE DATABASE" Error: Access denied for user 'wordpress'#'%' to database 'wordpress'
Which I find odd, because I'm naming the database testdatabase, so why is it trying to create a database named wordpress?
When I connected with SQL Pro, I could see testdatabase, but according to the console it's trying to create wordpress db.
How do I get it to connect to my named DB, instead of constantly failing to create wordpress?

Answer 1

So I think I got it.
It was really simple. In my wordpress portion of my .yml file I needed to include WP_DB_NAME: testdatabase
By doing that, it used my named testdatabase to install wordpress to.
Hope this helps people who might stumble across this.
Now the .yml file looks like this:
version: '3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql2
restart: always
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: somerootwordpresspw
MYSQL_DATABASE: testdatabase
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
volumes:
- ./WP-TEST/:/var/www/html/
depends_on:
- db
image: wordpress:latest
ports:
- "80:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_NAME: testdatabase
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data: