Node.js连接到MySQL Docker容器ECONNREFUSED

Question

在您将此问题标记为重复之前,请注意我确实阅读了其他答案,但这并没有解决我的问题.

我有一个Docker撰写文件,包含两个服务:

version: "3"
services:
  mysql:
    image: mysql:5.7
    environment:
      MYSQL_HOST: localhost
      MYSQL_DATABASE: mydb
      MYSQL_USER: mysql
      MYSQL_PASSWORD: 1234
      MYSQL_ROOT_PASSWORD: root
    ports:
      - "3307:3306"
    expose:
      - 3307
    volumes:
      - /var/lib/mysql
      - ./mysql/migrations:/docker-entrypoint-initdb.d
    restart: unless-stopped
  web:
    build:
      context: .
      dockerfile: web/Dockerfile
    volumes:
      - ./:/web
    ports:
      - "3000:3000"
    environment:
      NODE_ENV: development
      PORT: 3000
    links:
      - mysql:mysql
    depends_on:
      - mysql
    expose:
      - 3000
    command: ["./wait-for-it.sh", "mysql:3307"]

/网络/ Dockerfile:

FROM node:6.11.1

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY package.json /usr/src/app/
RUN npm install

COPY . /usr/src/app

CMD [ "npm", "start" ]

后docker-compose up --build服务启动,但是"wait-for-it.sh"等待MySQL的开始(所以暂时DB连接测试时,我不使用它时,脚本超时,我就等到控制台显示MySQL是准备接受传入连接)

当MySQL从主机运行时,我可以使用Sequel Pro登录并查询数据库并从中获取样本记录 ./mysql/migrations

我也可以通过SSH连接到正在运行的MySQL容器并执行相同操作.

但是,我的Node.js应用程序ECONNREFUSED 127.0.0.1:3307在连接时会产生

MySQL初始化:

import * as mysql from 'promise-mysql'

const config = {
    host: 'localhost',
    database: 'mydb',
    port: '3307',
    user: 'mysql',
    password: '1234',
    connectionLimit: 10
}

export let db = mysql.createPool(config);

MySQL查询:

import { db } from '../db/client'

export let get = () => {

return db.query('SELECT * FROM users', [])
    .then((results) => {
        return results

    })
    .catch((e) => {
        return Promise.reject(e)
    })
}

击中网址时调用的路由/

import { Router } from 'express';
import * as repository from '../repository'
export let router = Router();

router.get('/', async (req, res) => {

    let users;

    try{
        users = await repository.users.get();
    } catch(e){
        // ECONNREFUSED 127.0.0.1:3307
    }

    res.render('index', {
        users: users
    });
});

它不太可能是竞争条件,因为在Node.js失败的同时,我可以使用Sequel Pro或SSH查询正在运行的Docker容器和查询.所以这可能是Node.js无法访问MySQL容器的情况？

{
    error: connect ECONNREFUSED 127.0.0.1:3307
    code: 'ECONNREFUSED',
    errno: 'ECONNREFUSED',
    syscall: 'connect',
    address: '127.0.0.1',
    port: 3307,
    fatal: true
}

Answer 1

这个:

mysql:
    image: mysql:5.7
    environment:
    ...
    ports:
      - "3307:3306"

意味着Docker会将3307主机端口映射到3306容器的端口.所以你可以从Sequel访问localhost:3307.

但是,这并不意味着容器正在存在3307; 容器实际上仍在听取3306.当其他容器尝试访问mysqlDNS时,它会转换为内部容器IP,因此您必须连接到3306.

因此,您的节点配置应如下所示:

const config = {
    host: 'mysql',
    database: 'mydb',
    port: '3306',
    user: 'mysql',
    password: '1234',
    connectionLimit: 10
}

这在你的docker-compose.yml中:

command: ["./wait-for-it.sh", "mysql:3306"]