Docker Redis 错误：连接 ECONNREFUSED 127.0.0.1:6379

Question

我正在遵循 youtube 上的教程，在 Express、Node.js、Mongo 和 Redis 中创建一个简单的 dockerized CRUD 应用程序。我停留在关于使用会话和 Redis 进行身份验证的视频 3:06:57。

我发送 POST 时遇到的最初问题如下

ClientClosedError: The client is closed
    at Commander._RedisClient_sendCommand (/app/node_modules/@node-redis/client/dist/lib/client/index.js:408:31)
    at Commander.commandsExecutor (/app/node_modules/@node-redis/client/dist/lib/client/index.js:166:154)
    at Commander.BaseClass.<computed> [as set] (/app/node_modules/@node-redis/client/dist/lib/commander.js:8:29)
    at RedisStore.set (/app/node_modules/connect-redis/lib/connect-redis.js:65:21)
    at Session.save (/app/node_modules/express-session/session/session.js:72:25)
    at Session.save (/app/node_modules/express-session/index.js:406:15)
    at ServerResponse.end (/app/node_modules/express-session/index.js:335:21)
    at ServerResponse.send (/app/node_modules/express/lib/response.js:221:10)
    at ServerResponse.json (/app/node_modules/express/lib/response.js:267:15)
    at exports.login (/app/controllers/authController.js:45:28)
[nodemon] app crashed - waiting for file changes before starting...

我发现上面的问题是由于Redis版本引起的，如果没有记错的话，教程视频使用的是Redis 3.0+，但我使用的是Redis 6.0+。所以我添加了这一行，redisClient.connect().catch(console.error);但发生了第二个问题。

Error: connect ECONNREFUSED 127.0.0.1:6379
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1138:16) {
  errno: -111,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 6379
}

源文件如下：

index.js:

const express = require("express");
const mongoose = require("mongoose");
const session = require("express-session");
const redis = require("redis");
let RedisStore = require("connect-redis")(session);

const { MONGO_PASSWORD, MONGO_IP, MONGO_PORT, MONGO_USER, REDIS_URL, REDIS_PORT, SESSION_SECRET } = require("./config/config");


let redisClient = redis.createClient({
    host: REDIS_URL,
    port: REDIS_PORT,
})

// let redisClient = createClient({ 
//     host: REDIS_URL,
//     port: REDIS_PORT 
// });
 
//redisClient.connect().catch(console.error);

redisClient.on('error', err => {console.log('Error ' + err);});

docker-compose.yml:

version : "3"
services :
  node-app:
    build : .
    ports:
      - "3000:3000"
    environment:
      - PORT=3000
    depends_on:
      - mongo

  mongo:
    image: mongo
    environment:
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=password
    volumes:
      - mongo-db:/data/db

  redis:
    image: redis
    
volumes:
  mongo-db:

docker-compose.dev.yml:

version : "3"
services :
  node-app:
    build:
      context: .
      args:
        NODE_ENV: development
    volumes:
      - ./:/app
      - /app/node_modules
    environment:
      - NODE_ENV=development
      - MONGO_USER=admin
      - MONGO_PASSWORD=password
      - SESSION_SECRET=secret
      
    command: npm run dev
  mongo:
    environment:
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=password

config.js:

module.exports = {
    MONGO_IP: process.env.MONGO_IP || "mongo",
    MONGO_PORT: process.env.MONGO_PORT || 27017,
    MONGO_USER: process.env.MONGO_USER,
    MONGO_PASSWORD: process.env.MONGO_PASSWORD,
    REDIS_URL: process.env.REDIS_URL || "redis",
    REDIS_PORT: process.env.REDIS_PORT || 6379,
    SESSION_SECRET: process.env.SESSION_SECRET 
}

我检查了 redis 容器日志，它已启动并正在运行。它还应该与节点应用程序位于同一网络中。

码头命令：docker-compose -f docker-compose.yml -f docker-compose.dev.yml up -d

来自导师的完整源代码https://github.com/Sanjeev-Thiyagarajan/node-docker

Answer 1

Redis 客户端在 Redis v4 中不起作用。将 redisClient 代码替换为：

let redisClient = redis.createClient({
    legacyMode: true,
    socket: {
        port: REDIS_PORT,
        host: REDIS_URL
    }
})

redisClient.connect().catch(console.error)