因此，当我启动服务器时，大约有 60% 的时间会出现此错误。
[2014-10-31T00:55:30.763Z] ERROR: main/4588 on vagrant-centos65.vagrantup.com: undefined (err.errorno=ETIMEDOUT, err.code=ETIMEDOUT, err.syscall=connect, err.fatal=true)
Error: connect ETIMEDOUT
at Connection._handleConnectTimeout (/vagrant/node_modules/mysql/lib/Connection.js:346:13)
at Socket.g (events.js:180:16)
at Socket.emit (events.js:92:17)
at Socket._onTimeout (net.js:326:8)
at Timer.unrefTimeout [as ontimeout] (timers.js:427:13)
at Protocol._enqueue (/vagrant/node_modules/mysql/lib/protocol/Protocol.js:135:48)
at Protocol.handshake (/vagrant/node_modules/mysql/lib/protocol/Protocol.js:52:41)
at Connection.connect (/vagrant/node_modules/mysql/lib/Connection.js:109:18)
at /vagrant/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:41:16
at sequelizeResolver (/vagrant/node_modules/sequelize/lib/promise.js:32:12)
at new Promise (/vagrant/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:82:37)
at new SequelizePromise (/vagrant/node_modules/sequelize/lib/promise.js:28:17)
at ConnectionManager.connect (/vagrant/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:23:10)
From previous event:
at new Promise (/vagrant/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:82:37)
at new SequelizePromise (/vagrant/node_modules/sequelize/lib/promise.js:28:17)
at ConnectionManager.connect (/vagrant/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:23:10)
at ConnectionManager.$connect (/vagrant/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:200:41)
at Object.pool.Pooling.Pool.create (/vagrant/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:163:14)
at createResource (/vagrant/node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:261:13)
at dispense (/vagrant/node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:253:9)
at Object.me.acquire (/vagrant/node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:319:5)
From previous event:
at new Promise (/vagrant/node_modules/sequelize/node_modules/bluebird/js/main/promise.js:82:37)
at new SequelizePromise (/vagrant/node_modules/sequelize/lib/promise.js:28:17)
at ConnectionManager.getConnection (/vagrant/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:183:10)
at module.exports.Sequelize.query (/vagrant/node_modules/sequelize/lib/sequelize.js:590:85)
at module.exports.QueryInterface.createTable (/vagrant/node_modules/sequelize/lib/query-interface.js:151:29)
at /vagrant/node_modules/sequelize/lib/model.js:413:34
From previous event:
at module.exports.Model.sync (/vagrant/node_modules/sequelize/lib/model.js:408:20)
at /vagrant/node_modules/sequelize/lib/sequelize.js:730:20
Possibly unhandled Error: undefined
at Promise._settlePromiseAt (/vagrant/node_modules/sequelize/lib/promise.js:66:18)
From previous event:
at module.exports.Sequelize.sync (/vagrant/node_modules/sequelize/lib/sequelize.js:713:22)
at Object.<anonymous> (/vagrant/server.js:111:3)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
其他 40% 的时间都没有问题。这仅在我切换到 OS X 时才开始发生，但它都在流浪者中运行，所以这无关紧要。有任何想法吗？
编辑:
所以我缩小了问题所在。如果我忙于在代码中的任何地方等待约 10 秒(即使在开始时!)，我也可以重现该错误，例如
'use strict';
for (var i = 0; i < 1e10; i+=2){}
var express = require(...
所以看起来调用 sequelize.sync() 时间太长会导致这个错误。但为什么？
最佳答案
这看起来 Sequelize 无法成功连接到您的数据库并且超时。
首先确保您的数据库实际上正在运行，并且您可以使用与 sequelize 应用程序相同的来自 vagrant box 的连接参数进行连接。假设您正在运行 MySQL，您可以通过以下方式执行此操作:
vagrant ssh
然后从流浪盒子
mysql -usteven -pstevenspassword -hhostameofserver.com
这至少将确认应用程序能够连接到数据库。
此外，如果您的数据库与您的应用程序在同一台机器上运行，您可以尝试通过 UNIX 套接字而不是通过网络进行连接，如下所示:
var sequelize = new Sequelize('database', 'username', 'password', {
host: '127.0.0.1',
port: 3306,
logging: false,
dialect: 'mysql',
dialectOptions: {
socketPath: '/var/run/mysql.sock'
},
pool: {
maxConnections: 5,
maxIdleTime: 30
}
});
关于node.js - sequelize.sync() 期间的 ETIMEDOUT，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/26665750/