我正在尝试开发一个expressapi，它可以在本地机器上正常工作。我用的是docker，但在docker和heroku redis的生产上没有用
dockerfile文件

FROM node:latest

WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install 

COPY . .

EXPOSE 5000

CMD ["npm","start"]

docker.compose.yml文件

version: '3'
services:

  mongo:
    container_name: mongo
    image: mongo

    ports:
      - '27017:27017'
  redis:
    container_name: redis
    image: redis

  app:
    container_name: password-manager-docker
    image: app
    restart: always
    build: .

    ports:
      - '80:5000'
    links: 
      - mongo
      - redis
    environment: 
      MONGODB_URI: ${MONGODB_URI}
      REDIS_URL: ${REDIS_URL}   
      clientID: ${clientID}
      clientSecret : ${clientSecret}
      PORT: ${PORT}
      REDIS_HOST: ${REDIS_HOST}
      JWT_SECRET_KEY: ${JWT_SECRET_KEY}
      JWT_EXPIRE: ${JWT_EXPIRE}
      REFRESH_TOKEN: ${REFRESH_TOKEN}
      JWT_REFRESH_SECRET_KEY: ${JWT_REFRESH_SECRET_KEY}
      JWT_REFRESH_EXPIRE: ${JWT_REFRESH_EXPIRE}
      JWT_COOKIE: ${JWT_COOKIE}
      SMTP_HOST: ${SMTP_HOST}
      SMTP_PORT: ${SMTP_PORT}
      SMTP_USER: ${SMTP_USER}
      SMTP_PASS: ${SMTP_PASS}

redis文件

const asyncRedis = require('async-redis');
//process.env.REDIS_HOST's value is redis
const redisClient = asyncRedis.createClient({port:6379,host:process.env.REDIS_HOST || "127.0.0.1"});
redisClient.on("connect",() => {
  console.log(`Redis: ${host}:${port}`);
})
redisClient.on('error', function(err) {
  // eslint-disable-next-line no-console
  console.log(`[Redis] Error ${err}`);
});

heroku上的错误是“[redis]error error:redis connection to 127.0.0.1:6379 failed-connect econnrefered 127.0.0.1:6379”。它在没有 Docker 的情况下在heroku工作，但它不工作。谢谢你的帮助