mongoose connection options

mongoose-options.js

/* Mongoose 3.8.x configuration settings
 *
 * As discussed in: www.blogpost.com
 */
 
var mongoose = require('mongoose');
var uriUtil = require('mongodb-uri');

/* 
 * Mongoose by default sets the auto_reconnect option to true.
 * We recommend setting socket options at both the server and replica set level.
 * We recommend a 30 second connection timeout because it allows for 
 * plenty of time in most operating environments.
 */
 
var options = { server: { socketOptions: { keepAlive: 1, connectTimeoutMS: 30000 } }, 
                replset: { socketOptions: { keepAlive: 1, connectTimeoutMS : 30000 } } };       

/*
 * Mongoose uses a different connection string format than MongoDB's standard.
 * Use the mongodb-uri library to help you convert from the standard format to
 * Mongoose's format.
 */
 
var mongodbUri = 'mongodb://user:pass@host:port/db';
var mongooseUri = uriUtil.formatMongoose(mongodbUri);

mongoose.connect(mongooseUri, options);
var conn = mongoose.connection;             

conn.on('error', console.error.bind(console, 'connection error:'));  

conn.once('open', function(err) {                                                                                                                                         
  if(err) throw err;
  // Wait for the database connection to establish, then start the app.
  app.listen(3000);                                                          
});