无法使用 Node.js 创建 MongoDB 数据库

Question

I am trying to run the below program to create a mongo database using Node.js by running node app.js .

app.js

var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://hostname:27017/mydb";

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  console.log("Database created!");
  db.close();
});

Below is the error I'm getting:-

(node:20815) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.

MongoNetworkError: failed to connect to server [hostname_fqdn:27017] on first connect [Error: connect ECONNREFUSED 10.127.45.59:27017
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1134:16) {
  name: 'MongoNetworkError'
}]
    at Pool.<anonymous> (/root/myfolder/node_modules/mongodb/lib/core/topologies/server.js:438:11)
    at Pool.emit (events.js:223:5)
    at /root/myfolder/node_modules/mongodb/lib/core/connection/pool.js:562:14
    at /root/myfolder/node_modules/mongodb/lib/core/connection/pool.js:995:11
    at /root/myfolder/node_modules/mongodb/lib/core/connection/connect.js:32:7
    at callback (/root/myfolder/node_modules/mongodb/lib/core/connection/connect.js:280:5)
    at Socket.<anonymous> (/root/myfolder/node_modules/mongodb/lib/core/connection/connect.js:310:7)
    at Object.onceWrapper (events.js:313:26)
    at Socket.emit (events.js:223:5)
    at emitErrorNT (internal/streams/destroy.js:92:8) {
  name: 'MongoNetworkError'
}

The file/node_modules/package.json all are located in a CentOS Virtual Machine.

Answer 1

You need to start the MongoDB Service after installing.

Edited:

If you have already started service and connecting mongo via terminal, then try to remove mongo lock file (rm /var/lib/mongodb/mongod.lock) and repair mongod (mongod -–repair). Now start mongo service and see if you can connect. I had similar issue with EC2 and Compass and tried above to resolve.