Mongodb: failed to connect to server on first connect

499 Asked by Ajit yadav in Devops , Asked on Jun 14, 2021

I get the following error:

Warning { MongoError: failed to connect to server [mongodb:27017] on first connect at Pool. (/Users/michaelks/Desktop/users/node_modules/mongodb-core/lib/topologies/server.js:325:35) at emitOne (events.js:96:13) at Pool.emit (events.js:188:7) at Connection. (/Users/michaelks/Desktop/users/node_modules/mongodb-core/lib/connection/pool.js:270:12) at Connection.g (events.js:292:16) at emitTwo (events.js:106:13) at Connection.emit (events.js:191:7) at Socket. (/Users/michaelks/Desktop/users/node_modules/mongodb-core/lib/connection/connection.js:173:49) at Socket.g (events.js:292:16) at emitOne (events.js:96:13) at Socket.emit (events.js:188:7) at connectErrorNT (net.js:1025:8) at _combinedTickCallback (internal/process/next_tick.js:74:11) at process._tickCallback (internal/process/next_tick.js:98:9) name: 'MongoError', message: 'failed to connect to server [mongodb:27017] on first connect' }

Even though I get this in the terminal window where I run Mongo:

2016-12-25T03:45:23.715+0100 I NETWORK [initandlisten] connection accepted from 127.0.0.1:58868 #8 (8 connections now open)

It kinda looks like there is a connection.

I've tried both

$ mongod

and

$ brew services start mongo

This is my test_helper.js

const mongoose = require('mongoose'); mongoose.connect('mongodb:localhost/users_test'); mongoose.connection .once('open', () => console.log('Good to go!')) .on('error', (error) => {

console.warn('Warning', error);

});

I have not specifically made the db "users_test" as I am under the impression that mongoose or mongo or both will do this on the fly.

I've tried both "localhost" and "127.0.0.1". I'm on OSX 10.11.5 I'm running Node 7.3.0 and Mongo 3.2.9

What am I doing wrong? How do I figure out what's wrong?

Answered by akash Mishra

By using the below-mentioned codes you can solve mongoerror: failed to connect to server [localhost:27017] on first connect, you can use :

mongoose.connect('mongodb://localhost/users_test');

or

mongoose.connect('localhost/users_test');

or

mongoose.connect('localhost','users_test');

But not mongoose.connect('mongodb:localhost/users_test');it doesn't match the right hostname (mongodb instead of localhost)

Mongodb: failed to connect to server on first connect

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