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我有一个在 EC2 (Centos) 实例上运行的 NodeJS 服务器。我已经通过 AWS CodePipeline 设置了构建和部署管道。NodeJS 服务器设置为 systemd 服务。发布管道的部署阶段，服务器无法连接到我设置的 MongoDB。当我通过命令行使用以下命令运行服务时：
sudo systemctl restart myserver.service服务器连接到数据库。我无法弄清楚为什么它在我手动运行时有效，但在通过 CodeDeploy 部署后无效。以下是相关文件的内容：

应用规范.yaml

version: 0.0
os: linux
files:
  - source: /
    destination: /home/centos/my-server
hooks:
  BeforeInstall:
    - location: scripts/cleanup.sh
      timeout: 300
      runas: root
  AfterInstall:
    - location: scripts/install_dependencies.sh
      timeout: 300
      runas: root
    - location: scripts/update_service.sh
      timeout: 300
      runas: root
  ApplicationStart:
    - location: scripts/start_server.sh
      timeout: 300
      runas: root
  ApplicationStop:
    - location: scripts/stop_server.sh
      timeout: 300
      runas: root

启动服务器.sh

#!/bin/bash

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 9080
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 9443

sudo systemctl daemon-reload
sudo systemctl restart myserver.service

我的服务器服务

[Unit]
Description=Node.js My server
[Service]
ExecStart=/usr/bin/node /home/centos/my-server/index.js
WorkingDirectory=/home/centos/my-server/
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=my-server-log
Environment=PATH=/usr/bin:/usr/local/bin
Environment=NODE_ENV=production

[Install]
WantedBy=multi-user.target

index.js

const winston = require('winston');
const express = require('express');
const logging = require('./startup/logging');
const config = require('./startup/config');
const routes = require('./startup/routes');
const db = require('./startup/db');
const validation = require('./startup/validation');
const redirect = require('./startup/redirect');

const app = express();

const successMessage = async () => {
  const message = 'my-server is up and running and ready for requests..';
  winston.info(message);
  console.log(message);
};

const startServer = async () => {
  await logging();
  await config();
  await routes(app);
  await db();
  await validation();
  await redirect(app);

  await successMessage();
};

startServer();

数据库.js

const mongoose = require('mongoose');
const winston = require('winston');
const nconf = require('nconf');
const fs = require('fs');

module.exports = async function () {
  // Get the mongodb credentials from config memory
  const ipAddress = fs.existsSync('/.dockerenv')
    ? nconf.get('mongodb:dockerIPAddress')
    : nconf.get('mongodb:ipAddress');
  const port = nconf.get('mongodb:port');
  const username = encodeURIComponent(nconf.get('mongodb:username'));
  const password = encodeURIComponent(nconf.get('mongodb:password'));
  const database = nconf.get('mongodb:database');

  const mongoUrl = `mongodb://${username}:${password}@${ipAddress}:${port}/${database}?authSource=admin`;

  mongoose
    .connect(mongoUrl, {
      useNewUrlParser: true,
      useUnifiedTopology: true,
      useCreateIndex: true,
      useFindAndModify: false,
    })
    .then(() => winston.info('Connected to mongodb successfully..'))
    .catch((err) => winston.error('Could not connect to MongoDB!!!', err));
};

我检查了syslog, journalctl, codedeploy 日志，没有错误。并且当服务器没有连接到数据库时不会抛出任何错误。如果有人可以提供帮助，那就太棒了。

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