Digital Ocean Droplet中的MongoDB连接错误

问题描述

我正在将我的MERN应用程序部署到Digital Ocean Droplet(Ubuntu 20.04服务器)上.

I am in the process of deploying my MERN app to a Digital Ocean droplet (Ubuntu 20.04 server).

我已经将GitHub存储库克隆到了Droplet，并使用 npm install 安装了依赖项.接下来，当我使用 npm start 启动服务器时，出现以下错误:

I have cloned my GitHub repo to the droplet, installed the dependencies using npm install. Next, when I am starting the server using npm start, I get the following error:

该错误实质上表明 mongoose.connect()的第一个参数是未定义的，必须为字符串.但是，在我的本地计算机上一切正常，当我console.log process.env.MONGO_URI 时，我得到了连接字符串.

The error essentially says that the first parameter to mongoose.connect() is undefined and must be a string. However, everything works fine in my local machine and when I console.log process.env.MONGO_URI, I get the connection string.

server/config/db.js

server/config/db.js

const mongoose = require("mongoose");
const colors = require("colors");
const dotenv = require("dotenv");

dotenv.config();

const connectDB = async () => {
  try {
    const conn = await mongoose.connect(process.env.MONGO_URI, {
      useNewUrlParser: true,
      useCreateIndex: true,
      useUnifiedTopology: true,
    });
    console.log(`MongoDB connected: ${conn.connection.host}`.cyan.bold);
  } catch (error) {
    console.error(`Error: ${error.message}`.red.bold.underline);
    process.exit(1);
  }
};
2;
module.exports = connectDB;

为什么在Digital Ocean Droplet中启动服务器时出现此错误?

Why am I getting this error while starting the server in my Digital Ocean droplet?

推荐答案

dotenv 不会加载系统变量.

使用

MONGO_URI=XXXXXXX

https://github.com/motdotla/dotenv#usage

DB_HOST=localhost
DB_USER=root
DB_PASS=s1mpl3

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