How mongodb work in docker, How to connect with mongodb


For connecting to remote mongo (which started into container):
1. Pull mongo image from docker hub: docker pull mongo
2. Run image: docker run --name my_mongo -p 27017:27017 -d mongo
3. I connected to mongo from my nodejs app:

const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');

// Connection URL
const url = 'mongodb://localhost:27017';

// Database Name
const dbName = 'myproject';

// Create a new MongoClient
const client = new MongoClient(url, { useUnifiedTopology: true });

// Use connect method to connect to the Server
client.connect(function(err) {
  assert.equal(null, err);
  console.log("Connected successfully to server");

  const db = client.db(dbName);


Hope it will help anyone :slight_smile:

Best regards,
Daniil G

if mongodb is installed on dockerhost, you need to change mongod.conf settings, under net
change bindIp from to # this will accept remote connections
and change MONGODB_URI=mongodb://<YOURMACHINEIP>:27017/SampleDB

I hope this helps

I tried this and got:

                    throw error;

AssertionError [ERR_ASSERTION]: null == MongoServerSelectionError: connect ECONNREFUSED
    at Timeout._onTimeout (C:\Users\RachelCohen\DockerProject\ApiGenerator\node_modules\mongodb\lib\sdam\topology.js:330:38)
    at listOnTimeout (node:internal/timers:557:17)    at processTimers (node:internal/timers:500:7) {
  reason: TopologyDescription {    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined,
    servers: Map(1) {

Are you know what the problem is?
thank you