超时错误 |Google Cloud SQL database with NodeJS.

Question

我在谷歌云上创建了一个mysql数据库，我想从一个单独的节点Web应用程序（也在谷歌云上运行）访问它。我首先在计算机上本地测试连接，当我在本地运行以下代码时，我可以成功建立与数据库的连接并查看其中的数据。

'use strict';
// [START app]
const express = require('express');
const bodyParser = require('body-parser');
const path = require('path');
const app = express();
const mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'Cloud SQL IP',
  user      : 'username',
  password  : 'password',
  database  : 'db_name'
});

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))
// parse application/json
app.use(bodyParser.json())
// Make globals.js accessible
app.use(express.static(__dirname + '/'));

app.get('/', (req, res) => {
    connection.connect();
    connection.query('SELECT * FROM Users', function (error, results, fields) {
        if (error) throw error;
        console.log(results);
    });
    connection.end();
    res.status(200).send('Hello World!');
});
app.get('/login', (req, res) => {
    res.status(200).send();
});
// [START server]
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`App listening on port ${PORT}`);
  console.log('Press Ctrl+C to quit.');
});
// [END app]

但是，当我在我的谷歌应用引擎中运行相同的代码时（用于在端口 8080 上进行调试并在 https://myapp.appspot.com 上完全部署），我收到以下超时错误：

{ Error: connect ETIMEDOUT
    at Connection._handleConnectTimeout         (/home/megan_cooper2900/project/node_modules/mysql/lib/Connection.js:419:13)
at Socket.g (events.js:292:16)
at emitNone (events.js:86:13)
at Socket.emit (events.js:185:7)
at Socket._onTimeout (net.js:338:8)
at ontimeout (timers.js:386:14)
at tryOnTimeout (timers.js:250:5)
at Timer.listOnTimeout (timers.js:214:5)
--------------------
at Protocol._enqueue (/home/megan_cooper2900/project/node_modules/mysql/lib/protocol/Protocol.js:145:48)
at Protocol.handshake (/home/megan_cooper2900/project/node_modules/mysql/lib/protocol/Protocol.js:52:23)
at Connection.connect (/home/megan_cooper2900/project/node_modules/mysql/lib/Connection.js:130:18)
at app.get (/home/megan_cooper2900/journeyma/app.js:31:13)
at Layer.handle [as handle_request] (/home/megan_cooper2900/project/node_modules/express/lib/router/layer.js:95:5)
at next (/home/megan_cooper2900/project/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/home/megan_cooper2900/project/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/home/megan_cooper2900/project/node_modules/express/lib/router/layer.js:95:5)
at     /home/megan_cooper2900/project/node_modules/express/lib/router/index.js:281:22
    at Function.process_params         (/home/megan_cooper2900/project/node_modules/express/lib/router/index.js:335:12)
  errorno: 'ETIMEDOUT',
  code: 'ETIMEDOUT',
  syscall: 'connect',
  fatal: true }

为什么这在谷歌应用引擎应用程序上不起作用？

Answer 1

在 mysql 的连接配置中，host 在 App Engine 上不起作用。你必须使用socketPath.socketPath 是要连接到的 unix 域套接字的路径。使用时，将忽略主机和端口。（在 App Engine flex 上使用环回转移知识，这让我砰砰��它的值是云 SQL 实例连接名称

所以在你的例子中，它应该看起来像这样：/cloudsql/my-project-12345：us-central1：mydatabase

var connection = mysql.createConnection({
  socketPath     : '/cloudsql/my-project-12345:us-central1:mydatabase',
  user      : 'username',
  password  : 'password',
  database  : 'db_name'
});

如果您在 GCloud 上使用 Postgres，这是一个类似的过程，在这里有答案

Answer 2

我也

遇到了同样的问题，我正在使用Kubernetes pods访问我的CloudSQL实例。我通过增加配置中的超时得到了修复。

cloudSqlConfig: {
    connectionLimit: 10,
    host: 'your-host-ip',
    user: process.env.DB_USERNAME,
    password: process.env.DB_PASSKEY,
    database: 'myDB',
    connectTimeout: 20000,
    waitForConnections: true,
    queueLimit: 0
},