Access denied for user 'root' (using password: NO) - docker

Question

This is my docker-compose file, everytime I run the docker-compose up command I get the error specified in the title. I have tried running docker-compose config and everything matches.
version: "3.8"
services:
phedon-service:
build: .
restart: always
ports:
- "8080:8080"
networks:
- phedon
depends_on:
- phedon_db
env_file:
- .env
phedon_db:
image: "mariadb:10.6"
container_name: mariadb
restart: always
healthcheck:
test: [ "CMD", "mariadb-admin", "--protocol", "tcp" ,"ping" ]
timeout: 3m
interval: 10s
retries: 10
ports:
- "3307:3306"
networks:
- phedon
environment:
-MYSQL_DATABASE: "phedondb"
-MYSQL_USER: "root"
-MYSQL_PASSWORD: "12345"
-MYSQL_ROOT_PASSWORD: "12345"
env_file:
- .env
networks:
phedon:

Answer 1

your services.db.environment must be a mapping, not a list.
we can omit the root user password with MARIADB_ALLOW_EMPTY_ROOT_PASSWORD
db:
image: "mariadb:10.6"
container_name: mariadb
restart: always
healthcheck:
test: [ "CMD", "mariadb-admin", "--protocol", "tcp" ,"ping" ]
timeout: 3m
interval: 10s
retries: 10
ports:
- "3333:3306"
environment:
MYSQL_DATABASE: "phedondb"
MYSQL_USER: "phedon"
MYSQL_PASSWORD: "12345"
MARIADB_ALLOW_EMPTY_ROOT_PASSWORD: true
If you like to use the root password
For the admin ping command, we've to provide the password for the DB server. This can be done in different ways.
Using the MYSQL_PWD environment var.
Using the -p flag in the docker CLI
Creating some credentials file
services:
db:
image: "mariadb:10.6"
container_name: mariadb
restart: always
healthcheck:
test: [ "CMD-SHELL", "mysqladmin ping" ]
timeout: 3m
interval: 10s
retries: 10
ports:
- "3333:3306"
environment:
MYSQL_DATABASE: "phedondb"
MYSQL_USER: "phedon"
MYSQL_PASSWORD: "12345"
MYSQL_ROOT_PASSWORD: "12345"
MYSQL_PWD: "12345"