Mongoose autoReconnect option

Question

I'm trying to set up the MongoDB auto reconnection feature via Mongoose. Every way that I have tried to pass the option has had no effect, or at least the reconnected event isn't being emitted.

What I've tried:

mongoose.createConnection("mongodb://localhost:27017/test", { auto_reconnect: true }); mongoose.createConnection("mongodb://localhost:27017/test", { autoReconnect: true }); mongoose.createConnection("mongodb://localhost:27017/test", { server: { auto_reconnect: true } }); mongoose.createConnection("mongodb://localhost:27017/test", { server: { autoReconnect: true } }); 

If one of these is correct, the reconnected event should be triggered and a message should be logged in the console, however this never happens.

If there is a delay before the reconnection, does anyone know how to configure it?

Thanks in advance

For anyone looking into this, take a look at this and this issue in mongoose repository.

Answer 1

I had the same question as you, and robertklep's solution didn't work for me either. I found when MongoDB service is stopped, an error event is triggered, but the connection.readyState is still 1 (connected). That may be why it didn't auto reconnect.

This is what I have now:

  var db = mongoose.connection;    db.on('connecting', function() {     console.log('connecting to MongoDB...');   });    db.on('error', function(error) {     console.error('Error in MongoDb connection: ' + error);     mongoose.disconnect();   });   db.on('connected', function() {     console.log('MongoDB connected!');   });   db.once('open', function() {     console.log('MongoDB connection opened!');   });   db.on('reconnected', function () {     console.log('MongoDB reconnected!');   });   db.on('disconnected', function() {     console.log('MongoDB disconnected!');     mongoose.connect(dbURI, {server:{auto_reconnect:true}});   });   mongoose.connect(dbURI, {server:{auto_reconnect:true}}); 

Answer 2

Plucked from http://bites.goodeggs.com/posts/reconnecting-to-mongodb-when-mongoose-connect-fails-at-startup/

This worked for me:

var mongoose = require('mongoose') var mongoUrl = "mongodb://localhost:27017/test"  var connectWithRetry = function() {   return mongoose.connect(mongoUrl, function(err) {     if (err) {       console.error('Failed to connect to mongo on startup - retrying in 5 sec', err);       setTimeout(connectWithRetry, 5000);     }   }); }; connectWithRetry();