Docker-compose 報錯：Unsupported config option for services: 'mysql'

今天在運行Docker-compose 時報如下錯誤：

ERROR: The Compose file ‘./docker-compose.yml’ is invalid because:
Unsupported config option for services: ‘mysql’

經過檢查發現是頭部忘記加版本的問題
version: ‘2’
修改後如下：

version: '2'
services:
  mysql:
    image: mysql:8
    ports:
      - "3306:3306"
    volumes:
      - ./mysql:/var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=Wmh1073437487
      - MYSQL_USER=xiaohong
      - MYSQL_PASSWORD=Wmh1073437487
      - MYSQL_DATABASE=wordpress
      - MYSQL_RANDOM_ROOT_PASSWORD=1
    restart: always

運行後正常