docker aws rails 本番環境

Question

ec2上にdockerとrailsをデプロイしようと思っています。

しかし、We're sorry, but something went wrong.がでてしまいデプロイできません。logを見たところ

2020-11-23T12:11:33.019501Z 2 [Note] Access denied for user 'root'@'172.22.0.5' (using password: YES)

で止まっていることがわかりました。
いろいろサイトを見てみたところ自己解決できず質問させていただきました。
docker-compose.ymlが原因なのかと思うのですが解決方法がわからずもしわかる方がいれば教えてほしいです。。
宜しくお願いします。

# MySQL. Versions 6.1.10 and up are supported.
#
# Install the MySQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   https://dev.mysql.com/doc/refman/5.7/en/password-hashing.html
#
default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: password
  host: db

development:
  <<: *default
  database: app_development

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: app_test

# As with config/secrets.yml, you never want to store sensitive information,
# like your database password, in your source code. If your source code is
# ever seen by anyone, they now have access to your database.
# Instead, provide the password as a unix environment variable when you boot
# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
# for a full rundown on how to provide these environment variables in a
# production deployment.
#
# On Heroku and other platform providers, you may have a full connection URL
# available as an environment variable. For example:
#
#   DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase"
#
# You can use this database configuration with:
#
#   production:
#     url: <%= ENV['DATABASE_URL'] %>
#
production:
  <<: *default
  database: <%= ENV['DB_NAME'] %>
  username: <%= ENV['DB_USERNAME'] %>
  password: <%= ENV['DB_PASSWORD'] %>
  host: <%= ENV['DB_HOSTNAME'] %>

version: '3'
services:
  app:
    build:
      context: .
    env_file:
      - ./environments/db.env
    command: bundle exec puma -C config/puma.rb
    volumes:
      - .:/music_app
      - public-data:/music_app/public
      - tmp-data:/music_app/tmp
      - log-data:/music_app/log
    depends_on:
      - db
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: strongrootpassword
    env_file:
      - ./environments/db.env
    volumes:
      - db-data:/var/lib/mysql
  web:
    build:
      context: containers/nginx
    volumes:
      - public-data:/music_app/public
      - tmp-data:/music_app/tmp
    ports:
      - 80:80
    depends_on:
      - app
volumes:
"docker-compose.yml" 38L, 736C

DB_NAME=musicapp_production
DB_USERNAME=admin
DB_PASSWORD=052589Nao
DB_HOSTNAME=RDSエンドポイント.amazonaws.com