Unable to connect to MySQL database in docker container - mysql

Question

I'm honestly tired of this. I've tried every possible solution but it still refuses to connect.
Here is my docker-compose file:
version: '3'
services:
# Database
db:
image: mysql:5.7
container_name: db
restart: always
env_file: .env
environment:
- MYSQL_ROOT_HOST=%
- MYSQL_ROOT_PASSWORD=root
- MYSQL_DATABASE=$MYSQL_DATABASE
- MYSQL_USER=$MYSQL_USER
- MYSQL_PASSWORD=$MYSQL_PASSWORD
networks:
- backend
# Wordpress
wp:
depends_on:
- db
image: wordpress:php7.3-fpm
container_name: wordpress
restart: always
env_file: .env
environment:
- WORDPRESS_DB_HOST=db:3306
- WORDPRESS_DB_USER=$MYSQL_USER
- WORDPRESS_DB_PASSWORD=$MYSQL_PASSWORD
- WORDPRESS_DB_NAME=$MYSQL_DATABASE
volumes:
- ./wordpress:/var/www/html
networks:
- backend
# Nginx
nginx:
depends_on:
- wp
image: nginx
restart: always
ports:
- "80:80"
volumes:
- ./wordpress:/var/www/html
- ./nginx-conf:/etc/nginx/conf.d
networks:
- backend
networks:
backend:
driver: bridge
I've tried 127.0.0.1, 0.0.0.0, db, docker inspect db to get ip address of the container. All of them fail to connect. I've used Sequel Pro, MySQL Workbench and DataGrip.
The setup works completely fine. Its just that I cant connect to the database outside the container.
I even checked the mysql host privileges in the container and got:
% root
% wordpress (name of the user I created)
...
Am I missing something?

Answer 1

In order to reach your database from the host machine with an sql client you need to map the MYSQL database port to the host machine.
In your Compose file add the port mapping to your db service.
db:
...
ports:
- "3306:3306"
I believe you are using the default port based on your Wordpress service.
Then configure your SQL client to 127.0.0.1 and port 3306.

Answer 2

MYSQL Changes
MY.ini changes in c:\programdata\mysql\mysql server 8.0
Add Bind_address=0.0.0.0
Save as Admin - Check timestam
Create one App user - Dont user mysql Root user for app
drop user 'username'#localhost;
FLUSH PRIVILEGES;
CREATE USER 'username'#'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'#'localhost' WITH GRANT OPTION;
CREATE USER 'username'#'%' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'#'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;
Restart the MYSQL Server
Restart Docker for Windows
Check Hosts files in C:\Windows\System32\drivers\etc if host.docker.internal variable is updated correctly
# Added by Docker Desktop
10.0.0.6 host.docker.internal
10.0.0.6 gateway.docker.internal
Application Changes:
User host.docker.internal in JDBC URL in app.properties
spring.datasource.url=jdbc:mysql://host.docker.internal:3306/test
spring.datasource.username=username
spring.datasource.password=password
maven install should work
docker run <repo/repo>:image should work fine. now