I'm new in nodeJS, started learning by following a trailer on youtube, everything goes well until I added the connect function if mongodb,
mongo.connect("mongodb://localhost:27017/mydb")
when I run my code on cmd (node start-app), get the following error,
MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]
Could someone explain me which step I missed ?
my code :
var express = require("express");
var MongoClient = require('mongodb');
var url = "mongodb://localhost:27017/mydb";
var webService = require("./webService");
var server = express();
MongoClient.connect(url, function (err, db) {
if (err) throw err;
console.log("Database created!");
db.close();
});
server.use(express.urlencoded({ extended: true }));
server.set('views', __dirname);
server.get('/', function (request, response) {
response.sendFile(__dirname + '/MainPage.html');
});
server.get('/Sign', function (request, response) {
response.render(__dirname + '/Sign.ejs');
});
server.post("/signUp", webService.signUp);
server.post("/createUser", webService.createUser);
server.listen(5500);
You have to install MongoDB database server first in your system and start it.
Use the below link to install MongoDB
https://docs.mongodb.com/manual/installation/
If you have installed MongoDB check if the server is in which state (start/stop). Try to connect through mongo shell client.
Many of them don't add this, especially in AWS EC2 Instance, I had the same issue and tried different solutions.
Solution: one of my database URL inside the code was missing this parameter 'authSource', adding this worked for me.
mongodb://myUserName:MyPassword#ElasticIP:27017/databaseName?authSource=admin
I faced same issue but after a lot of RND. I found that whts the problem so run this command on your terminal.
sudo service mongod start
then run mongo on terminal
After trying EVERY solution google came up with on stack overflow, I found what my particular problem was. I had edited my hosts file a long time ago to allow me to access my localhost from my virtualbox.
Removing this entry solved it for me, along with the correct installation of mongoDB from the link given in the above solution, and including the correct promise handling code:
mongoose.connect('mongodb://localhost/testdb').then(() => {
console.log("Connected to Database");
}).catch((err) => {
console.log("Not Connected to Database ERROR! ", err);
});
Following the logic behind #CoryM's answer above :
After trying EVERY solution google came up with on stack overflow, I found what my particular problem was. I had edited my hosts file a long time ago to allow me to access my localhost from my virtualbox.
Removing this entry solved it for me...
I had edited my hosts file too for Python Machine Learning setup 2 months ago. So instead of removing it because I still need it, I use 127.0.0.1 in place of localhost and it worked :
mongoose.connect('mongodb://127.0.0.1/testdb')
Your IP address probably changed.
If you've recently restarted your modem, this changes your IP which was probably whitelisted on Atlas.
Soooo, you'll need to jump back onto Atlas and add your new IP address to the whitelist under Security>Network Access.
This had occurred to me and I have found out that it was because of faulty internet connection. If I use the public wifi at my place, which blocks various websites for security reasons, Mongo refuses to connect. But if I were to use my own mobile data, I can connect to the database.
If the mongoDB server is already installed and if you are unable to connect from a remote host then follow the below steps,
Login to your machine, open mongodb configuration file located at /etc/mongod.conf and change the bindIp field to specific ip / 0.0.0.0 , after that restart mongodb server.
sudo vi /etc/mongod.conf
The file should contain the following kind of content:
systemLog:
destination: file
path: "/var/log/mongodb/mongod.log"
logAppend: true
storage:
journal:
enabled: true
processManagement:
fork: true
net:
bindIp: 127.0.0.1 // change here to 0.0.0.0
port: 27017
setParameter:
enableLocalhostAuthBypass: false
Once you change the bindIp, then you have to restart the mongodb, using the following command
sudo service mongod restart
Now you'll be able to connect to the mongodb server, from remote server.
I solved this problem by upgrading major version of mongoose:
Before doing this, make sure (using mongo shell) that you have the correct URL and a running mongo server is available at that URL and the problem still persists.
"dependencies": {
- "mongoose": "^5.4.13",
+ "mongoose": "^6.2.4",
}
just run mongod in terminal on the base folder if everything has been set up like installing mongo db and the client for it like mongoose. After running the command run the project file that you are working on and then the error shouldn't appear.
You can check detail of error by running this command
sudo service mongod status
if error is something like this
Failed to unlink socket file /tmp/mongodb-27017.sock Unknown error
Fatal Assertion 40486 at src/mongo/transport/transport_layer_asio.cpp 670
simply running this will resolve your issue
rm /tmp/mongodb-27017.sock
I don't know if this might be helpful, but when I did this it worked:
Command mongo in terminal.
Then I copied the URL which mongo command returns, something like
mongodb://127.0.0.1:*port*
I replaced the URL with this in my JS code.
first create folder by command line mkdir C:\data\db (This is for database)
then run command mongod --port 27018 by one command prompt(administration mode)- you can give name port number as your wish
I had this issue while working at the local Starbucks and I remembered that when I initially set up my database through Mongo Atlas. I set my IP address to be able to access the database. After looking through several threads, I changed my IP address on Atlas and the issue went away. Hope this helps someone.
This worked for me.
mongoose.Promise = global.Promise;
.connect(
"mongodb://127.0.0.1:27017/mydb",
{ useNewUrlParser: true, useCreateIndex: true, useUnifiedTopology: true}).then(db => {
console.log("Database connected");
}).catch(error => console.log("Could not connect to mongo db " + error));
I was using localhost, so i changed it to:
mongodb://127.0.0.1:27017/mydb
My problem was the wrong port number for mongoDB server.
I had:
DATABASE_URL= "mongodb://localhost:3000/node-express-mongodb-server"
in my .env file (my environmental variables), but I had written it before running mongoDB server. So when I ran the mongoDB server, it wrote a different port number and I had to change it. I changed it to the right port number (which was written on my cmd window by mongoDB):
DATABASE_URL= "mongodb://localhost:27017/node-express-mongodb-server"
and now it works fine.
if you are a Mac user just upgrade your homeBrew from terminal:
$ brew upgrade
$ mongod --config usr/local/etc/mongod.config
$ Xcode-select --install
$ mongo
1) If you haven't installed mongodb, install it.
2) open a new terminal, type "mongo". This is going to connect you to a MongoDB instance running on your localhost with default port 27017:
mongoose.connect('mongodb://localhost:27017/').then(() => {
console.log("Connected to Database");
}).catch((err) => {
console.log("Not Connected to Database ERROR! ", err);
});
Better just connect to the localhost Mongoose Database only and create your own collections. Don't forget to mention the port number. (Default: 27017)
For the best view, download Mongoose-compass for MongoDB UI.
This one helped me.
Try creating a new folder, if your MongoDB is installed in C:\Program Files the folder should be called db and in a folder data.
C:\data\db
When you start the mongod there should be a log where the db 'isnt found'.
So when none of the above solutions worked for me, after installing everything correctly, I thought to restart the system.
It's working now.
Note that I did everything said above, but no luck. The only restart worked for me.!!
You may also want to restart once.
You have to install MongoDB database server first in your system and start it.
Use the below link to install MongoDB
If you have already installed MongoDB database in your system then you have to check that your DB is in start position or not with the help of following steps:
press CTRL + Shift + Esc
go to the service tab and search for Mongo
check the status - it may be stopped. So click on the Services tab at the bottom right corner and again search for MongoDB
Click on it and start the DB by right click or in left panel.
If the error happens on macbook run this command to keep the mongodb server running.
mongod --config /usr/local/etc/mongod.conf --fork
The issue majorly is that your mongodb server is rejecting the connection it might be that the server is not on/active eventhough it has been installed on your macbook.
In my case the problem was that there was another instance of mongoDB server running I had shutdown my computer without stopping the server hence when I tried running mongosh it gives me that error. Try restarting the computer it will shutdown all the servers and the erro was gone.
I was trying to connect, without starting the service.
This is how i fixed the error (MacOS env).
$ brew services start mongodb-community#6.0
$ mongosh // connected to db and fixed the error.
$ brew services stop mongodb-community#6.0
For me the problem resolved when I started the MongoDB on port other than 27017. Even though nothing was running on 27017 but the problem resolved when I started it on another port.
To do that navigate to the /etc/mongod.conf and change the port: 27017 to some other port like port: 27019.
Then restart the service by:
sudo systemctl restart mongod.service.
And then try to connect to MongoDB by specifying the --port parameter like:
mongod --port 27019, or
mongo --port 27019
Best!
this was my erros:
Connecting to: mongodb://127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000&appName=mongosh+1.6.2
MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017
SOLUTION:
The best Answes is if you using mac M1 and M2
use restrat with sudo like below
MongoNetworkError solution
sudo brew services restart mongodb-community#6.0
I connected to a VPN and the connection accomplished. I was using school's WiFi which has some restrictions apparently.
I guess you must be connecting to cloud.mongodb.com to your cluster.
One quick fix is to go to the connection tab and add your current IP address(in the cluster portal of browser or desktop app). The IP address must have changed due to a variety of reasons, such as changing the wifi.
Just try this approach, it worked for me when I got this error.
You need to initialize your mongoDB database first, you can run "mongod" in your terminal and then it will be working fine.
Related
I use Robo 3T as a UI tool for MongoDB on a Windows 8 machine. Now I've deployed the DB to production on a Ubuntu 14 server in Amazon EC2 cloud. When I try to connect from the Windows machine to the Ubuntu one via Robo 3T, I receive the following error:
Cannot connect to the MongoDB at [http://12.345.678.90]:27017.
Error: No unix socket support on windows
Is that a problem I need to fix on my computer by installing something? or it's an issue of Mongo 3T?
If it's an issue on my Windows, what do I have to install in order to make it work?
If it's a Mongo 3T issue, do you know another UI that does support connecting from Windows to Ubuntu?
Perhaps an EC2 solution?
Or maybe some settings I need to change in Robo 3T?
I've tried changing "http" to "mongodb" to no avail. I've also tried removing the protocol prefix as suggested here but I ended up with the error:
Cannot connect to the MongoDB at 12.345.678.90:27017.
Error: Network is unreachable.
Do you have a bindIP setting in your mongo configuration file? Probably that can cause the error.
Either remove the bindIp configuration or allow your IP to access mongo server.
(restart your service after changes the configuration).
I just downloaded Compass to be able to see my database. npm start goes through but the connection times out. I use curl to keep it open. Once everything is running smoothly, I try to connect on Compass and it says the connection is closed.
Here is what I have in my db.js
mongo.connect('mongodb://localhost:3000/Loc8r', {server: {socketOptions: {keepAlive: 3000}}});
If you are using default settings, mongod is probably running on port 27017 so you can use mongo.connect('mongodb://localhost/Loc8r').
io.adapter(redis({ host: config.redisHost, port: config.redisPort }));
Both the confif.redisHost and config.redisPort are the correct values, but when I try to connect from my code I get the error -
'Error: Redis connection to 104.xxx.xx.xxx:6379 failed - connect ECONNREFUSED 104.xxx.xx.xxx:6379'
In redis.conf I've changed the bind to 0.0.0.0 as well as removing it completely and I've also tried setting protected mode to off just to try and get the connection working.
The IP and port are definitely, correct. Does anyone know why I might not be able to access the server from my code? My code is just being ran on my local machine and the redis server is being ran on a digital ocean ubuntu 14.04 machine. The status of the server is definitely running and I can access the redis-cli from the machine itself.
For some reason, it wasn't using redis.conf when I tried starting the server, I had to manually tell it to use it when starting up, now it's working.
I have MongoDB 3.2 installed on my Linux Red Hat server.
I am starting to access it and looking at the mongo Shell instructions.
For a Windows machine, the instructions want me to get to the command prompt and change dirs to the installation directory. The problem is, MongoDB is installed on my web server and not my local windows machine.
Question: does Mongo Shell apply to me then? How do I start using, connecting and accessing Mongo from my Windows and Mac machines?
[Note: I am a traditional MySQL / phpMyAdmin developer looking to advance to MongoDB]
Amendments:
(1) With the help of #AlexBlex I am progressing to trying to connect to my MongoDB on my server from Robomongo on my windows client. I get the following error when trying to setup my connection. I tried the address with just my server ip and with http://{my server ip}. Neither worked. See screen shot of error
(2) This is what I have in my current mongod.conf file:
#port=27017
bind_ip=127.0.0.1
(3) here is what my connection settings look like. Oddly, #AlexBlex's solution below shows an SSH tab on his Mac version. The Windows and Mac versions I just installed lacks that tab.
If you install MongoDB on your local machine, you can use the Mongo shell like below to connect to your remote server
mongo yourserver:27017/database
You will have to configure your Mongo server to allow remote connections. In order to achieve this you need to have the following line in your /etc/mongodb.conf file. You need to replace 10.0.0.2 with the ip address of your client machine.
bind_ip = 127.0.0.1,10.0.0.2
You need either ssh to the server where mongodb is installed, or install mongodb on local machine.
For robomongo to connect to remote host you need to ssh to the server, and check it listens on external interface:
lsof -i | grep 27017
In case it is bound to localhost only, you need to edit a line with bind_ip in /etc/mongodb.conf and restart the service.
I would recommend to keep it listening on the local interface only for security reasons, and use ssh tunnelling to connect:
I found the answer. #ShahNewasKhan is brilliant. See How to connect Robomongo to MongoDB
All you need to do is SSH to server and edit mongod.conf file:
uncomment #port=27017 to port=27017
comment bind_ip=127.0.0.1 to #bind_ip=127.0.0.1
restart mongodb via service mongod restart
Then create a mongo connection via your server ip in the address field and 27017 in the port field
Hope this helps mongo newbies and start-ups like me :) Good luck.
Now I just need to figure out how to make this secure. My concern is that anyone who knows my server ip can hack into my MongoDB
I am running two different instances on AWS, one for node application and other for mongoDB. I am trying to connect to mongoDB on other instance but not able to and failing with "504 Gateway timed out".
My db_conf.js to connect to node application is like below:
var express = require('express');
var mongodb = require('mongodb');
var url = "mongodb://<PUBLIC IP of mongoDB instance>:27017/local";
module.exports = url;
I have commented the "bind_ip" in mongodb.conf and restarted mongoDB.
Also, I have opened the port 27017 for the node application server's public IP from the security groups of mongoDB instance for both inbound and outbound but of no use.
Please suggest a way to achieve this(if there is any). Thanks in advance :)
All looks correct here, you do correctly open port 27017 on the mongoDB instance. Also, you may want to try and kill the original mongod server process, and restart it explicitly pointing to your config file so that it knows to use those settings. Something like the following should accomplish this (assuming your on a linux machine and your config file is in the default folder)-
sudo kill mongod PID
and then
sudo mongod --fork --config /etc/mongod.conf