how to connect MongoDB in Cloud9?

Question

I have a problem with the connection database MongoDB in Cloud9 Please help to resolve this issue!

var MongoClient = require("mongodb").MongoClient;
var port = process.env.PORT;
var ip   = process.env.IP;
MongoClient.connect("mongodb://"+ip+":"+port+"/test",function(error,db){
        if(!error){
         console.log("We are connected");   
        }
        else{
         console.dir(error); //failed to connect to [127.4.68.129:8080]               
        }
});

Output:

Running Node Process
Your code is running at 'http://demo-project.alfared1991.c9.io'.
Important: use 'process.env.PORT' as the port and 'process.env.IP' as the host in your scripts!
[Error: failed to connect to [127.4.68.129:8080]]

Answer 1

If you follow https://docs.c9.io/setting_up_mongodb.html this link, you will setup and run your mongodb daemon under your workspace.

And if you take a look at the output of ./mongod, you'll find out this output:

2015-08-22T12:46:47.120+0000 [initandlisten] MongoDB starting : pid=7699 port=27017 dbpath=data 64-bit host=velvetdeth-express-example-1804858

Just copy the host and port value to your mongodb config, set up the database url, in this case is:

mongodb://velvetdeth-express-example-1804858:27017

Answer 2

process.env.PORT and process.env.IP are the port and IP address for your application, not your database. You'll want to pull your Mongo connection string from your MongoDB provider.

Below is the hello world example from the Node.js homepage modified to use the two environment variables.

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(process.env.PORT || 1337, process.env.IP || '127.0.0.1');