问题的起因是，在阿里云的ECS上尝试部署Egg的项目的，但是一直报

 ERROR 449 nodejs.SequelizeAccessDeniedError: Access denied for user 'root'@'localhost' (using password: YES)
[egg-scripts]     at Utils.Promise.tap.then.catch.err (/home/egg/hc_user/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:141:19)
[egg-scripts]     at tryCatcher (/home/egg/hc_user/node_modules/bluebird/js/release/util.js:16:23)
[egg-scripts]     at Promise._settlePromiseFromHandler (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:512:31)
[egg-scripts]     at Promise._settlePromise (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:569:18)
[egg-scripts]     at Promise._settlePromise0 (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:614:10)
[egg-scripts]     at Promise._settlePromises (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:690:18)
[egg-scripts]     at _drainQueueStep (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:138:12)
[egg-scripts]     at _drainQueue (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:131:9)
[egg-scripts]     at Async._drainQueues (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:147:5)
[egg-scripts]     at Immediate.Async.drainQueues [as _onImmediate] (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:17:14)
[egg-scripts]     at runCallback (timers.js:693:18)
[egg-scripts]     at tryOnImmediate (timers.js:664:5)
[egg-scripts]     at processImmediate (timers.js:646:5)
[egg-scripts] name: "SequelizeAccessDeniedError"
[egg-scripts] parent: {"code":"ER_ACCESS_DENIED_ERROR","errno":1045,"sqlState":"28000","sqlMessage":"Access denied for user 'root'@'localhost' (using password: YES)"}
[egg-scripts] original: {"code":"ER_ACCESS_DENIED_ERROR","errno":1045,"sqlState":"28000","sqlMessage":"Access denied for user 'root'@'localhost' (using password: YES)"}

数据库是阿里云的RDS Mysql，已开白名单，在ECS上尝试过ping RDS 的链接，可以ping通。 尝试过在RDS多加一个testuser的用户，配置上testuser的账号密码后，还是报一样的错误。如果 user 改变了 ‘root’@‘localhost’ 这里应该会变成’testuser’@‘localhost’ 的吧？ config.prod.js 的配置如下

'use strict';
module.exports = () => {
  const config = exports = {};
  // change to your own sequelize configurations
  config.sequelize = {
    dialect: 'mysql',
    port: 3306,
    hostname: '2123123123123123.mysql.rds.aliyuncs.com',
    database: 'test',
    user: 'testuser',
    password: '12123123123',
    define: {
      underscored: false,
    },
  };
  return config;
};

config.default.js 中没有sequelize 的配置，config.local.js 中的sequelize 配置也改成和config.prod.js 问题一样。 数据库的账号密码也在dms-rds.aliyun.com/main.do 上试过登陆，是没有问题的。 因为这个ECS 是用来测试的，所以内部也安装了一个mysql。 目前不清楚到底项目是按那个配置在运行，链接的mysql是那个，用那个账号密码来链接。 ECS上部署的项目 是用

egg-scripts start --daemon

来运行的，同样也有试过

EGG_SERVER_ENV=prod  egg-scripts start --daemon
// 或者 
export NODE_ENV=production  &&  egg-scripts start --daemon

问题一样。

为了了解项目的目前情况，加了一个app.js 的文件

'use strict';
class AppBootHook {
  constructor(app) {
    console.log('\x1B[31m%s\x1b[0m:', `constructor... app: ${JSON.stringify(app)}`);
    app.beforeStart(() => {
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor beforeStart app.config.env: ${app.config.env}, process.env.NODE_ENV: ${process.env.NODE_ENV}`);
    });
    app.ready((...a) => {
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor ready...  a: ${JSON.stringify(a)}`);
    });

    app.beforeClose((...a) => {
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor beforeClose...  a: ${JSON.stringify(a)}`);
    });

    app.once('server', server => {
      // websocket
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor once('server')...  server: ${JSON.stringify(server)}`);
    });
    app.on('error', (err, ctx) => {
      // report error
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor on('error')...  ctx: ${JSON.stringify(ctx)} , err: ${JSON.stringify(err)}`);
    });
    app.on('request', ctx => {
      // log receive request
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor on('request')...  ctx: ${JSON.stringify(ctx)}`);
    });
    app.on('response', ctx => {
      // ctx.starttime is set by framework
      const used = Date.now() - ctx.starttime;
      app.logger.info('\x1B[31m%s\x1b[0m:', `constructor on('response')...  ctx: ${JSON.stringify(ctx)}, used: ${used}`);
      // log total cost
    });

  }

  async beforeStart(...a) {
    console.log('\x1B[31m%s\x1b[0m:', `beforeStart...  a: ${JSON.stringify(a)}`);
  }

  async ready(...a) {
    console.log('\x1B[31m%s\x1b[0m:', `ready...  a: ${JSON.stringify(a)}`);
  }

  configDidLoad(...a) {
    // Config,plugin files have did load.
    console.log('\x1B[31m%s\x1b[0m:', `configDidLoad...  a: ${JSON.stringify(a)}`);
  }

  async didLoad(...a) {
    // All files have did load, start plugin here.
    console.log('\x1B[31m%s\x1b[0m:', `didLoad...  a: ${JSON.stringify(a)}`);
  }

  async willReady(...a) {
    // All plugins have started, can do some thing before app ready
    console.log('\x1B[31m%s\x1b[0m:', `willReady...  a: ${JSON.stringify(a)}`);
  }

  async didReady(...a) {
    // Worker is ready, can do some things
    // don't need to block the app boot.
    console.log('\x1B[31m%s\x1b[0m:', `didReady...  a: ${JSON.stringify(a)}`);
  }

  async serverDidReady(...a) {
    // Server is listening.
    console.log('\x1B[31m%s\x1b[0m:', `serverDidReady...  a: ${JSON.stringify(a)}`);
  }

  async beforeClose(...a) {
    // Do some thing before app close.
    console.log('\x1B[31m%s\x1b[0m:', `beforeClose...  a: ${JSON.stringify(a)}`);
  }
}

module.exports = AppBootHook;

在本地 egg-bin dev 的时候输出的是

在ECS上 运行 egg-scripts start --daemon 的时候

> egg-scripts start --daemon

[egg-scripts] Starting egg application at /home/egg/hc_user
[egg-scripts] Run node /home/egg/hc_user/node_modules/egg-scripts/lib/start-cluster {"title":"egg-server-hc_user","framework":"/home/egg/hc_user/node_modules/egg","baseDir":"/home/egg/hc_user"} --title=egg-server-hc_user
[egg-scripts] Save log file to /root/logs
[egg-scripts] Wait Start: 1...
[egg-scripts] Wait Start: 2...
[egg-scripts] tail -n 100 /root/logs/master-stderr.log
[egg-scripts] Got error when startup: 
[egg-scripts] 2018-10-12 10:38:39,134 ERROR 449 nodejs.SequelizeAccessDeniedError: Access denied for user 'root'@'localhost' (using password: YES)
[egg-scripts]     at Utils.Promise.tap.then.catch.err (/home/egg/hc_user/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:141:19)
[egg-scripts]     at tryCatcher (/home/egg/hc_user/node_modules/bluebird/js/release/util.js:16:23)
[egg-scripts]     at Promise._settlePromiseFromHandler (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:512:31)
[egg-scripts]     at Promise._settlePromise (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:569:18)
[egg-scripts]     at Promise._settlePromise0 (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:614:10)
[egg-scripts]     at Promise._settlePromises (/home/egg/hc_user/node_modules/bluebird/js/release/promise.js:690:18)
[egg-scripts]     at _drainQueueStep (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:138:12)
[egg-scripts]     at _drainQueue (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:131:9)
[egg-scripts]     at Async._drainQueues (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:147:5)
[egg-scripts]     at Immediate.Async.drainQueues [as _onImmediate] (/home/egg/hc_user/node_modules/bluebird/js/release/async.js:17:14)
[egg-scripts]     at runCallback (timers.js:693:18)
[egg-scripts]     at tryOnImmediate (timers.js:664:5)
[egg-scripts]     at processImmediate (timers.js:646:5)
[egg-scripts] name: "SequelizeAccessDeniedError"
[egg-scripts] parent: {"code":"ER_ACCESS_DENIED_ERROR","errno":1045,"sqlState":"28000","sqlMessage":"Access denied for user 'root'@'localhost' (using password: YES)"}
[egg-scripts] original: {"code":"ER_ACCESS_DENIED_ERROR","errno":1045,"sqlState":"28000","sqlMessage":"Access denied for user 'root'@'localhost' (using password: YES)"}

还没有加载到app.js 的感觉。 请问，要怎样去解决这个问题？ egg.js 的生命周期方法，有在egg-sequelize测试数据库链接前的方法吗？