Servidor MySQL5 e Redis com docker-compose v3

.env

MYSQL_ROOT_PASSWORD=root
MYSQL_DATABASE=dbname

docker-compose.yml

version: '3'

services:
  db:
    image: mysql:5
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD
      - MYSQL_DATABASE
    ports:
      - 3306:3306
  redis:
    image: redis:alpine