docker-compose.yml

version: "3.1"

services:
  php:
    image: php:7.2-apache_ext-mysqli
    build: .
    volumes:
      - ./src:/var/www/html
    networks:
      - backend
    secrets:
      - secret-phrase
      - secret-in-a-file
      - mysql_password
    environment:
      - "MY_ENV_VAR=Lorem ipsum dolor sit amet"
      - SECRET_FILE_PATH=/run/secrets/secret-in-a-file
      # database configs
      - MY_DB_PASSWORD_FILE=/run/secrets/mysql_password
      - MY_DB_USER=user
      - MY_DB_HOST=mysql
      - MY_DB_DATABASE=mydb

  mysql:
    image: mysql:8
    networks:
      - backend
    environment:
      - MYSQL_USER=user
      - MYSQL_PASSWORD_FILE=/run/secrets/mysql_password
      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/mysql_root_password
      - MYSQL_DATABASE=mydb
    secrets: 
      - mysql_password
      - mysql_root_password
    # this command is required in order to login with user/password
    command: --default-authentication-plugin=mysql_native_password

networks:
  backend:

secrets:
  secret-phrase:
    external: true
  secret-in-a-file:
    external: true
  mysql_password:
    file: ./mysql_password.txt
  mysql_root_password:
    file: ./mysql_root_password.txt