node.js - digitalocean ubuntu 18.4 上的 Mongodb / nodejs 问题

Question

我在 digitalocean 上使用 ubuntu 18.4 设置了 droplets，我安装了 nodejs 和 mongodb。

当我尝试通过 nodejs 连接到我的 API 时，我在执行 pm2 日志时收到此错误：

0|index    | App is running at http://localhost:5000 in development mode
0|index    | test Press CTRL-C to stop
0|index    | 
0|index    | You have triggered an unhandledRejection, you may have 
forgotten to catch a Promise rejection:
0|index    | App is running at http://localhost:5000 in development mode
0|index    | test Press CTRL-C to stop
0|index    | 
0|index    | You have triggered an unhandledRejection, you may have 
forgotten to catch a Promise rejection:
0|index    | App is running at http://localhost:5000 in development mode
0|index    | test Press CTRL-C to stop
0|index    | 
0|index    | You have triggered an unhandledRejection, you may have 
forgotten to catch a Promise rejection:

/root/.pm2/logs/index-error.log last 15 lines:
0|index    |     at deprecated (internal/util.js:47:15)
0|index    |     at connect 
 (/var/www/xxx/xxx/node_modules/mongodb/lib/operations/mongo_client_ops.js:179:3)
0|index    |     at connectOp (/var/www/xxx/xxx/node_modules/mongodb/lib/operations/mongo_client_ops.js:283:3)
0|index    |     at executeOperation (/var/www/xxx/xxx/node_modules/mongodb/lib/utils.js:420:24)
0|index    |     at MongoClient.connect (/var/www/xxx/xxx/node_modules/mongodb/lib/mongo_client.js:168:10)
0|index    |     at Promise (/var/www/xxx/xxx/node_modules/mongoose/lib/connection.js:493:12)
0|index    |     at new Promise (<anonymous>)
0|index    |     at NativeConnection.Connection.openUri (/var/www/xxx/xxx/node_modules/mongoose/lib/connection.js:490:19)
0|index    |     at Mongoose.createConnection (/var/www/xxx/xxx/node_modules/mongoose/lib/index.js:190:17)
0|index    |     at Object.<anonymous> (/var/www/xxx/xxx/index.js:6:30)
0|index    |     at Module._compile (module.js:652:30)
0|index    |     at Object.Module._extensions..js (module.js:663:10)
0|index    |     at Module.load (module.js:565:32)
0|index    |     at tryModuleLoad (module.js:505:12)
0|index    |     at Function.Module._load (module.js:497:3)

Mongodb 运行完美，我的 nodejs 代码是这样的：

const express     = require('express')
const session     = require('express-session');
const bodyParser  = require('body-parser');
const path        = require('path')
const mongoose    = require('mongoose');
const connection  = mongoose.createConnection(process.env.MONGODB_URI);
const app         = (module.exports = express());

mongoose.connect("mongodb://localhost:27017/Lab", function (err) {
   if (err) console.error('Could not connect to mongodb.');
});
...
app.listen(app.get('port'), () => {
console.log(
  'App is running at http://localhost:%d in %s mode',
  app.get('port'),
  app.get('env')
);
   console.log('test Press CTRL-C to stop\n');
});

在控制台上我可以看到消息：

0|index    | App is running at http://localhost:5000 in development mode
0|index    | test Press CTRL-C to stop

所以我认为我的 nodejs 应用程序运行良好，但与 mongodb 的连接有问题，有人可以帮助我吗？

**** 更新当我运行： CLI 上的 mongo 我有这个：

MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.6.3
Server has startup warnings: 
2018-08-04T09:56:28.449+0000 I STORAGE  [initandlisten] 
2018-08-04T09:56:28.449+0000 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2018-08-04T09:56:28.449+0000 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2018-08-04T09:56:29.619+0000 I CONTROL  [initandlisten] 
2018-08-04T09:56:29.619+0000 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-08-04T09:56:29.619+0000 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-08-04T09:56:29.619+0000 I CONTROL  [initandlisten] 

谢谢你。

标签： node.jsmongodbdigital-ocean