dockerからmysqlに接続できない【ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)】 - Qiita

$ mysql -u root -p Enter password: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) version: '3' services: node: build: context: . dockerfile: Dockerfile volumes: - ./:/usr/src/app command: sh -c "npm run dev" ports: - '3000:3000' db: image: mysql:latest restart: always hostname: my-mysql env_file: - .env environment: MYSQL_USER: sample_user