I'm trying to set up an API on the Google App Engine standard environment but I'm having trouble connecting to a distant MongoDB instance.
I use a free M0 cluster on MongoDB Atlas, all IP are whitelisted. The Google App Engine firewall rules allow all traffic from all IP addresses to make sure the connection request is not blocked.
However, I cannot connect to my Mongo instance and I get the following error:
ERROR db_connection querySrv ESERVFAIL <mongo-url>.gcp.mongodb.net
To connect to the MongoDB instance I use Mongoose and do the following:
const db = await mongoose.connect(uri, { useNewUrlParser: true });
However db will always be null since I cannot connect. Is there a way to connect to MongoDB Atlas from App Engine Standard or do I have to use Cloud Datastore ?
I had to use the older version of the atlas url
It works for me with older driver version url:
You don't have to use Datastore. You can connect to a mongoDB hosted outside of Google servers, there is some example code here. I would also like to refer you to this documentation on connecting to external databases from the Standard Environment.
Making sure your firewalls are open is necessary (and you have already done that, so that's great).
MongoDB Node.JS drivers are listed here, depending on the version you use, different reference documents are available with connection samples (all listed on that same link).
Related
I haven't created an account in fastcomet yet, but I would like to ask the following questions. The site mentions that it supports node.js applications. So that means I can upload an express application right? How about MongoDB and mongoose? I can access MongoDB by typing in the terminal
$ mongod --dbpath=data -bind_ip 127.0.0.1
And the MongoDB URL in my case is
mongodb://localhost:27017/ilovearisti
How different would it be in fastcommet? I guess I'll have to contact them for the port numbers right?
Thanks,
Theo.
FastComet Team here! Indeed, our hosting plans are fully compatible with Node.js apps and you can have your project hosted on an appropriate package.
If you plan using the MongoDB database type in particular, our experience shows it requires a server solution with more resources and a higher level of private access. This way you would be able to accommodate the operation on an environment suitable for coding with Mongoose on top of the MongoDB driver for Node.js.
As for addressing your URL query, the default IP when starting a mongo instance is set to 127.0.0.1, so it is configured as localhost and port 27017. With this in mind, you only need to make changes on the IP configuration via the mongod daemon if you are using a remote database setup with a different IP address.
Having said all of the above, we can confirm that if you have created a database called iloveiristi, the MongoDB URL will be as follows:
mongodb://localhost:27017/iloveiristi
We hope this information proves useful and we wish you good luck with your project.
Best regards!
I've been working on a simple website using node.js, express, and MongoDB, with Heroku as the platform. I had a lot of issues early on trying to connect to my MongoDB Atlas cluster, resulting in Heroku throwing request timeout errors.
After some googling, I surmised that the issue was that the IP addresses Heroku sends requests to my DB from weren't whitelisted in Atlas. The simplest solution at that point was to egregiously set up so that any IP is considered whitelisted. Which actually works fine currently.
My actual question comes down to the fact that whitelisting all IPs hardly seems like a professional way to go about doing things.
What is a better solution?
You should only allow those IPs from which your application will connect to MongoDB Atlas. Allow all IPs is a bad practice and could make that MongoDB instance vulnerable.
I am trying to connect to a mongoDB Atlas cluster using my node app, it wasn't working so I tried it with the mongoDB Compass. It shows timeout error. I can't figure out the problem, I have already whitelisted my IP from the database.
I am behind a proxy (my college has a proxy) but I even tried it with mobile data but it still won't work.
I've connected to mLab using MongoClient.connect, but now I want to create a local database rather than use mLab. I've tried changing the URL to "mongodb://localhost:27017/mydb" to create a database locally as suggested, but I'm getting a failed to connect to server error. Is there anything I should install? Or am I just missing something?
First, install your mongoDB server:
https://docs.mongodb.com/manual/installation/
After that, you should be able to start your local mongodb server:
sudo service mongod start //in case of linux
Here the docs to start the mongodb server
Then, you will type mongo and the client command line will start.
And when typing use yourDatabase, mongo will create the database if
it does not exist.
Then, your server will be up, and the database created. Anyway, check the docs if you need the guides for windows or other systems.
First you need to understand how server works and mlab works. mLab is a company who provide database as a services. Means you no need to handle server hurdles, they take care server , backups , infrastructure etc. They provide mongodb server , You just need to create database on mongodb server's and use them.
Now comes to main points.
If you want use mongodb on your local system then you first need to install mongodb on your local system and then connect it.
I created a NodeJS app that connects with a MongoDB and it seems to work locally.
Now, after hosting the NodeJS application on a remote machine, I am trying to connect to a mongoDB that was already created on that machine. When I print out some of the environment variables, the only one I see of relevance seems to be :
MONGODB_PORT: 'tcp://172.30.204.90:27017',
I tried connecting like I usually do with
mongoose.connect('mongodb://localhost:27017/metadata/')
and replacing it with mongoose.connect('tcp://172.30.204.90:27017/metadata') but I get an error that says my URI needs to start with 'mongodb'.
So I tried replacing it with mongoose.connect('mongodb://172.30.204.90:27017/metadata') and it no longer throws any error. But on the MongoDB side I don't see any new connections happening and my app does not start up on the machine. What should I be putting in the URI?
Your URI should indeed start with mongodb:
mongoose.connect('mongodb://username:password#host:port/database?options...');
See this page for more information: https://docs.mongodb.com/manual/reference/connection-string/
Did you try to connect to the database from cli? Or Telnet to see that connection isn't blocked.