Question

我有NODE.JS应用程序，可与远程MySQL数据库一起使用。在我的本地计算机（Windows 10）中，应用程序已成功连接到远程MySQL数据库。我将sequelize库用于此任务。 MySQL数据库为每个用户提供40个最大连接池。当我在Docker服务器中的CentOS中运行此应用程序时，我注意到错误。尝试连接到Docker容器中的远程MySQL数据库时，应用程序引发错误。您认为此问题的原因可能是什么？我该如何解决这个问题？

错误：

Unable to connect to remote MySQL database: { SequelizeConnectionError: connect ETIMEDOUT
    at Utils.Promise.tap.then.catch.err (/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:149:19)
    at tryCatcher (/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/node_modules/bluebird/js/release/promise.js:512:31)
    at Promise._settlePromise (/node_modules/bluebird/js/release/promise.js:569:18)
    at Promise._settlePromise0 (/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/node_modules/bluebird/js/release/promise.js:690:18)
    at _drainQueueStep (/node_modules/bluebird/js/release/async.js:138:12)
    at _drainQueue (/node_modules/bluebird/js/release/async.js:131:9)
    at Async._drainQueues (/node_modules/bluebird/js/release/async.js:147:5)
    at Immediate.Async.drainQueues [as _onImmediate] (/node_modules/bluebird/js/release/async.js:17:14)
    at processImmediate (timers.js:632:19)
  name: 'SequelizeConnectionError',
  parent:
   { Error: connect ETIMEDOUT
       at Connection._handleTimeoutError (/node_modules/mysql2/lib/connection.js:173:17)
       at listOnTimeout (timers.js:324:15)
       at processTimers (timers.js:268:5)
     errorno: 'ETIMEDOUT',
     code: 'ETIMEDOUT',
     syscall: 'connect',
     fatal: true },
  original:
   { Error: connect ETIMEDOUT
       at Connection._handleTimeoutError (/node_modules/mysql2/lib/connection.js:173:17)
       at listOnTimeout (timers.js:324:15)
       at processTimers (timers.js:268:5)
     errorno: 'ETIMEDOUT',
     code: 'ETIMEDOUT',
     syscall: 'connect',
     fatal: true } }

JS ：

const Sequelize = require('sequelize');

// "max_user_connections" resource for "db_user" user is "40".
const sequelize = new Sequelize('db_name', 'db_user', 'db_password', {
    host: 'HOST',
    port: '3306',
    dialect: 'mysql',
    pool: {
        max: 15,
        min: 5,
        idle: 20000,
        evict: 15000,
        acquire: 30000
    }
});

sequelize.authenticate().then(() => {
    console.log('Connection to remote MySQL database has been established successfully.');
}).catch(err => {
    console.error('Unable to connect to remote MySQL database:', err);
});

module.exports = sequelize;

依赖项：

"sequelize": "^4.42.0",
"mysql2": "^1.6.4"

无法连接到Node.js应用程序（DOCKER）中的远程MySQL数据库？

0 个答案: