docker mysql 出现错误：连接 ECONNREFUSED

Question

尝试从微服务中连接数据库，连接数据库失败

错误：连接 ECONNREFUSED 172.18.0.2:3306

service/index.js

var http = require('http');

//create a server object:
http.createServer(function (req, res) {
    res.write('Hello World!'); //write a response to the client
    res.end(); //end the response
}).listen(8080); //the server object listens on port 8080

console.log("Listening at 8080");

var mysql = require('mysql');

var con = mysql.createConnection({
    host: "database",
    user: "root",
    password: "password"
});

con.connect(function(err) {
    if (err) throw err;
    console.log("Database Connected!");
});

docker-compose.yml

version: '3'

services:
  database:
    build:
      ./database
    ports:
      - "6603:3306"
    image: "test-mysql"
    container_name: "test-mysql"

  service:
    build:
      ./service
    ports:
      - "8080:8080"
    depends_on:
      - database
    image: "test-nodejs"
    container_name: "test-nodejs"
    restart: on-failure

我尝试使用不同的设置连接到数据库。

1) 没有端口

var con = mysql.createConnection({
    host: "database",
    user: "root",
    password: "password"
});

2) 指定端口3306

var con = mysql.createConnection({
    host: "database",
    user: "root",
    password: "password"
    port: 3306
});

3) 指定端口6603

var con = mysql.createConnection({
    host: "database",
    user: "root",
    password: "password",
    port: 6603
});

数据库/Dockerfile

FROM mysql

ENV MYSQL_DATABASE=test
ENV MYSQL_ROOT_PASSWORD=password

EXPOSE 6603:3306

COPY ./schema.sql /docker-entrypoint-initdb.d/

基本上我的node.js微服务如何发现数据库服务？

---

编辑

我怀疑在 nodejs 启动时数据库还没有准备好，所以我在连接到数据库之前添加了一些延迟并更改了错误

更新代码

setTimeout(function(){

    var mysql = require('mysql');

    var con = mysql.createConnection({
        host: "database",
        user: "root",
        password: "password"
    });

    con.connect(function(err) {
        if (err) throw err;
        console.log("Database Connected!");
    });

}, 20 * 1000);

输出

Error: ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

Answer 1

数据库端口没有被翻译，因为它在容器中。只需在您的应用中使用 3306

Answer 2

可能您使用的 MySQL 版本不支持您尝试的登录。尝试使用 mysql v5.7：

docker run -d -p 6603:3306 --name mysql-container -e MYSQL_ROOT_PASSWORD=password mysql:5.7

Answer 3

你错过了订单：

先连接数据库，再监听端口。

var http = require('http');
var mysql = require('mysql');

var con = mysql.createConnection({
  host: "database",
  user: "root",
  password: "password"
 } );

con.connect(function(err) {
  if (err) throw err;
  console.log("Database Connected!");
});

 //create a server object:
 http.createServer(function (req, res) {
 res.write('Hello World!'); //write a response to the client
 res.end(); //end the response
  }).listen(8080); //the server object listens on port 8080

console.log("Listening at 8080");