Django docker could not access MYSQL in host server (using docker-compose) - mysql

Question

I have a working django application run via docker to be used for production. Currently, its also using a mysql database which is also hosted using docker. This actually works fine.
However, as what I learned, hosting mysql database on docker may not be a preferable way to do it in production. Which is why I wanted to use my host server, which has mysql running instead. My problem is, I can't seem to make it my django app connect to the host server's mysql server.
This is my docker-compose file.
version: '3.9'
networks:
default:
external: true
name: globalprint-shared-network
services:
#db:
# image: mysql:5.7
# ports:
# - "3307:3306"
# hostname: globalprint-db
# restart: always
# volumes:
# - production_db_volume:/var/lib/mysql
# env_file:
# - .env.prod
app:
build:
context: .
ports:
- "8001:8000"
volumes:
- production_static_data:/vol/web
hostname: globalprint-backend
restart: always
env_file:
- .env.prod
# depends_on:
# - db
proxy:
build:
context: ./proxy
hostname: globalprint-backend-api
volumes:
- production_static_data:/vol/static
restart: always
ports:
- "81:80"
depends_on:
- app
volumes:
production_static_data:
production_db_volume:
I actually have tried adding this in app service and made but still it did not work:
extra_hosts:
host.docker.internal:host-gateway
My django settings for database is also this one. Its actually referencing to an environment variable but the value for host is host.docker.internal and port is 3306:
DATABASES = {
'default': {
'ENGINE': env('DATABASE_ENGINE_MYSQL'),
'NAME': env('MYSQL_DATABASE'),
'USER': env('MYSQL_USER'),
'PASSWORD': env('MYSQL_PASSWORD'),
'HOST': env('DATABASE_HOST'), # localhost Or an IP Address that your DB is hosted on
'PORT': env('DATABASE_PORT'),
}
}
Can anyone tell what did I do wrong here? Appreciate any help on this. Thank you.