I'm a begginer in NodeJS and when i run node MainApp.js in console I get this error:
C:\Assigment 2 (NodeJS)\node_modules\mongodb\lib\server.js:235
process.nextTick(function() { throw err; })
^
Error: getaddrinfo ENOTFOUND . .:27017
at errnoException (dns.js:26:10)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:77:26)
I don't know what this means. Inside MainApp I connect mongoose: mongoose.connect("./DataBase"); where DataBase is the folder where I run mongod --dbpath "C:\[...]\DataBase. The database server seems to start successfully, the console printing: [...] waiting for connections on port 27017.
server.js lines 231-236:
// Try to callback
try {
callback(err);
} catch(err) {
process.nextTick(function() { throw err; })
}
Package versions:
"express": "~4.13.1",
"mongodb": "~2.1.0",
"mongoose": "~4.3.1"
make sure that your database is up and running.
Go to your terminal and in your app directory run:
mongod
Then restart your node server and you should be good go
I do not understand the whole process yet, but I hope this answer will provide some insight:
It seems that running node or npm start without starting up the database returns this error.
If database is started, then changing
mongoose.connect("./DataBase"); (which previously caused the error)
to mongoose.connect('mongodb://localhost/database');fixes the issue.
Intuitively this seems to simply be the error MongoDB returns when it can't find the database used by the server, however this might not be the precise description of the issue.
If someone can provide further insight into the problem, such help would be appreciated.
I changed connection string from mongodb://localhost:27017/ to mongodb://127.0.0.1:27017/ and it worked.
Related
I have created a MongoDB Cloud Database to test my NodeJs Backend.
Ocassionally (probably the 70% of the time), I cant connect and the connect and the console throws the following error log:
node:internal/errors:464
ErrorCaptureStackTrace(err);
^
Error: querySrv ESERVFAIL _mongodb._tcp.cluster0.u08yi.mongodb.net
at QueryReqWrap.onresolve [as oncomplete] (node:dns:213:19) {
errno: undefined,
code: 'ESERVFAIL',
syscall: 'querySrv',
hostname: '_mongodb._tcp.cluster0.u08yi.mongodb.net'
}
The weird thing is that I can connect sometimes. Is it because it is free and then it is prone to fail? It is getting frustrating since sometimes I have to keep updating my nodemon hoping for the ddbb to connect.
I already allowed my IP access.
Im using Mongoose and connecting this way:
mongoose.connect(`mongodb+srv://username:password#cluster0.u08yi.mongodb.net/mydatabase?retryWrites=true&w=majority`,(err)=>{
if(err) throw err;
console.log("MongoDB Connected Successfully");
})
I have been trying to connect to Atlas using the university.mongodb.com connection string:
mongodb+srv://m001-student:m001-mongodb-basics#cluster0-jxeqq.mongodb.net/test
But the compass GUI gives the following error:
queryTxt ETIMEOUT cluster-0-jxeqq.mongodb.net
I created my own cluster and tried again. But unfortunately, the same error showed up. I tried to write a JavaSript code as (the angular placeholders had the actual values in them):
const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb+srv://<user>:<password>#cluster0.amffz.gcp.mongodb.net/<dbname>?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
if (err) return console.log(err);
const collection = client.db("test").collection("collection-1");
client.close();
});
...which gave me this error:
Error: queryTxt ETIMEOUT cluster0.amffz.gcp.mongodb.net
at QueryReqWrap.onresolve [as oncomplete] (dns.js:202:19) {
errno: undefined,
code: 'ETIMEOUT',
syscall: 'queryTxt',
hostname: 'cluster0.amffz.gcp.mongodb.net'
}
In Atlas, I enabled the Network Access in the Security option to :
0.0.0.0/0
I disabled my firewall just to be sure that the connection is not being blocked:
sudo ufw disable
But nothing seems to work.
Any help?
[Edit]
System Config: Ubuntu 20.04 LTS
I figured out that the machine which I was using had some problem with the connectivity.
I figured out the way to solve this. I uninstalled MongoDB. It seemed like it had some configuration issues.
I removed mongodb and mongoose npm packages as well.
Re-installed everything. And viola, it got connected!
mongodb connection error with node and express.
The error:
at QueryReqWrap.onresolve [as oncomplete] (dns.js:206:19) {
errno: undefined,
code: 'ECONNREFUSED',
syscall: 'querySrv',
hostname: '_mongodb._tcp.clustr0-a1rol.mongodb.net'
}
Here are some possible issues with this case:
Check your IP address is whitelisted with your MongoDB client
Check your connection URI once again to check the possible error with that.
Please check this other problem and solution. link
I have faced the same issue, whatever I done is:
restart my node server.
change my database user.
change my network and waiting sometime.
then tried to connect.
this time mongo connection was fine.
N.B- you can check your connection URI too, if its ok. then try with a different network.
I have been trying for a few days to connect my mongoDB to MEAN stack without success. Its running on AWS lightsail (Bitnami). The website itself is running fine, except for any pages that have an ajax/db call, as the database is not connecting/authenticating my connection string.
I am using the mongo,node, express part of the stack, I do not need or know any angular at present. I thought this would be easier than setting up on nodeJS and then adding mongoDB separately (well i did try that first with similar problems), I do intend to learn angualar in future so this is probably better long term. Server side set up is currently a weakness.
I am using mongoose for the connection. I can access the database using:
mongo admin --username root -p password via SSH.
I can also access the db via Rockmongo SSH. There is currently only one admin user in the database at present i.e. root.
My initial server/startup file is below:
server.js
const app = require('/opt/bitnami/apps/MYAPP/app.js');
require('dotenv').config({ path: 'variables.env' });
const mongoose = require("mongoose");
mongoose.Promise = global.Promise;
mongoose.connect(process.env.DATABASE_CONN);
app.listen(3000,function(){
console.log("Server has started!");
});
variables.env
DATABASE_CONN = mongodb://root:password#127.0.0.1:27017/MYAPPDATABASE
I have also tried many other connections strings, exchanging root for bitnami default user, etc.
When I go to my app folder and start the server (npm start or node server.js), the website starts up but with the below mongoDB authentication errors, below is only the first section.
> Server has started!
Connection error: { MongoError: Authentication failed.
at /opt/bitnami/apps/MYAPP/node_modules/mongoose/node_modules/mongodb-core/lib/con
nection/pool.js:595:61
at authenticateStragglers (/opt/bitnami/apps/MYAPP/node_modules/mongoose/node_modu
les/mongodb-core/lib/connection/pool.js:513:16)
at Connection.messageHandler (/opt/bitnami/apps/MYAPP/node_modules/mongoose/node_m
odules/mongodb-core/lib/connection/pool.js:549:5)
at emitMessageHandler (/opt/bitnami/apps/MYAPP/node_modules/mongoose/node_modules/
mongodb-core/lib/connection/connection.js:309:10)
at Socket.<anonymous> (/opt/bitnami/apps/MYAPP/node_modules/mongoose/node_modules/
mongodb-core/lib/connection/connection.js:452:17)
at emitOne (events.js:116:13)
at Socket.emit (events.js:211:7)
at addChunk (_stream_readable.js:263:12)
at readableAddChunk (_stream_readable.js:250:11)
at Socket.Readable.push (_stream_readable.js:208:10)
at TCP.onread (net.js:597:20)
name: 'MongoError',
message: 'Authentication failed.',
ok: 0,
errmsg: 'Authentication failed.',
code: 18,
codeName: 'AuthenticationFailed' }
Any help or direction would be much appreciated. Thank you kindly.
Mos.
OK. Solution found.
In the mongo.conf file I set the dbpath to /data/db
The mongo shell is pointed to /opt/bitnami/mongodb/tmp/mongodb-27017.sock "$#"
go to /opt/bitnami/mongodb/bin/mongo
change /opt/bitnami/mongodb/tmp/mongodb-27017.sock "$#" to /tmp/mongodb-27017.sock "$#"
Can do that using sudo nano /opt/bitnami/mongodb/bin/mongo then edit the file.
Still have noauth turned on, so next step is getting my db connection string to authenticate.
Hope it helps someone.
Thanks
Some improvement. I have edited mongo.conf for now to enable no auth. I then ran mongod which stated no /data/db folder for which it stores data. So I created the folders and ran mongod again. Now all pages work but the mongo shell command 'mongo' will not work on the terminal.
I think its because the mongod dbpath is set to data/db and the mongodb conf file dbpath is set to /opt/bitnami/mongodb/data/db.
So I am trying to update the mongod dbpath but it doesnt seem to update.
I've got a problem to connect my socketIO application (made with nodeJS) with my mongoDB.
I try to connect on an remote server, but its throws me error
Here's my code (there's no user/password set in the mongoDB) :
var url = "mongodb://192.168.1.5:27017/DB"
MongoClient.connect(url, function(err, db) {
console.log("test")
if (!err) {
console.log("test");
}
else {
console.dir(err)
throw err
}
// db.close();
});
And here's when I launch the server and I tried to launch the app in a navigator :
Server listening at port 80:
{ [MongoError: connect ECONNREFUSED] name: 'MongoError', message: 'connect ECONNREFUSED' }
/root/fys-realtime/examples/chat/node_modules/mongodb/lib/server.js:228
process.nextTick(function() { throw err; })
^
Error
at Error.MongoError (/root/fys-realtime/examples/chat/node_modules/mongodb/node_modules/mongodb-core/lib/error.js:13:17)
at Server.destroy (/root/fys-realtime/examples/chat/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:629:47)
at Server.close (/root/fys-realtime/examples/chat/node_modules/mongodb/lib/server.js:344:17)
at Db.close (/root/fys-realtime/examples/chat/node_modules/mongodb/lib/db.js:267:19)
at /root/fys-realtime/examples/chat/node_modules/mongodb/lib/db.js:196:12
at null.<anonymous> (/root/fys-realtime/examples/chat/node_modules/mongodb/lib/server.js:226:9)
at g (events.js:180:16)
at emit (events.js:98:17)
at null.<anonymous> (/root/fys-realtime/examples/chat/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:238:68)
at g (events.js:180:16)
This error is returned for several errors like :
server is not running
you need to authenticate user
this database does not exists
the mongodb port is not the default port
Check this. Normaly your problem is just one of these causes
For this to work you have to make the changes in /etc/mongod.conf
comment bind_ip=127.0.0.1 As if this line in not commented it Listen to local interface only.
One of the solutions is to change 127.0.0.1 to public ip or whatever the router provided you with in mongodb config file located in /etc
There could be few reasons for ECONNREFUSED error.
Checkpoints
Check if your port is not serving any other process.
Check if your mongod is running.
Check if you localHost is configured correctly with your id or not.
for more you can see this