http://localhost:ポート番号を変更する方法 - Qiita

version: "3" services: app: build: context: . dockerfile: Dockerfile ports: - "3000:3000" tty: true stdin_open: true command: bash -c "bundle exec rails s -p 3000 -b '0.0.0.0'" depends_on: - db db: image: mysql:8.0.16 command: --default-authentication-plugin=mysql_native_password restart: always environment: MYSQL_HOST: 127.0.0.1 MYSQL_DATABASE: app_development MYSQL_USERNAME: root MYSQL_ROOT_PASS