Install MongoDB on EC2 Instance – Solved Connection Issue From Public DNS

In this article, we’re going to install MongoDB on EC2 instance in AWS. Installing MongoDB on EC2 via aptitude is very simple. To install MongoDB on your EC2 Ubuntu system you can follow the official MongoDB-org package, which is maintained by MongoDB Inc.

Prerequisites

• AWS Account

Launch EC2 Instance

Pick any AMI (for this I am using ubuntu 20.04), select desired instance type, Storage, configure proper VPC, subnet, etc.

Create or pick an existing security group that has SSH port enabled in the inbound rule.

Launch instance with creating new or using existing keypair. For detail instructions on launching instances, follow the official documentation.

Install MongoDB on EC2

SSH into the server instance by running the following command: (Make sure your instance’s private key directory)

$ chmod 400 <keypair name>
$ ssh -i ~/dir/<keypair name> ubuntu@<EC2 instance IP address>

Now, import a private key repository package for MongoDB to install on your server:

$ wget -qO - https://www.mongodb.org/static/pgp/server-4.2.asc | sudo apt-key add -

And add sources to your system:

$ echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.2.list

Update the package:

$ sudo apt update

Now you’re ready to install MongoDB on your system:

$ sudo apt install -y mongodb-org

You’ve successfully installed MongoDB on your system, let’s start the mongo service and verify:

$ sudo systemctl start mongod
$ sudo systemctl status mongod

You can enable the service to start every time you reboot the system by running the following command:

$ sudo systemctl enable mongod

Here, you’ve successfully installed MongoDB on your Ubuntu Server in AWS.

Connect To Remote MongoDB Server

In this section, we’ll set up user authentication for mongo so that we can read and write to the MongoDB server.

User Setup

SSH into the server and type mongo to run mongo shell. For this tutorial, I’m gonna set up a user sagar and give read-write access to the example_db database.

use example_db

db.createUser({
    user: 'sagar',
    pwd: 'my-password',
    roles: [{ role: 'readWrite', db:'example_db'}]
})

Enable MongoDB access to all IPs

Edit /etc/mongod.conf file:

$ sudo nano /etc/mongod.conf

Look for the net line and comment out the bindIp line under it, which is currently limiting MongoDB connections to localhost.

Note: do not comment out the bindIp line without enabling authorization, authorization can be enabled by un-comenting # security section and adding authorization: 'enabled'.

# network interfaces
net:
    port: 27017
#    bindIp: 127.0.0.1   <-- comment out this

security:
    authorization: 'enabled'

Open port 27017 on your EC2 server

Go to Security Groups of your instance.
Edit the inbound rule on your server’s security group by allowing Custom TCP on port 27017 (you can set traffic source as anywhere 0.0.0.0/0 or as per your requirements).

Restart and Check Status of Mongo Daemon

Restart:

$ sudo service mongod restart

Check the status:

$ sudo service mongod status

If anything goes wrong or not, you can always check the logs:

$ sudo tail -f /var/log/mongodb/mongod.log

Accessing MongoDB

Using Mongo Shell:

Access the remote Mongo Database we just set up:

$ mongo -u sagar -p my-password <Instance's public IP>/example_db

Here you go, now you can read and write within the example_db database without ssh.

Using Mongo Client:

Host = mongodb://sagar:my-password@<Instance's public IP>/example_db
Port = 27017 (default)

Fix-1 Cannot access from other IPs

By default, the MongoDB server only allows connections from localhost(127.0.0.1). So, if you face an issue connecting the database, you can fix this by binding all IPs.

To allow connections from elsewhere in your VPC edit /etc/mongod.conf:

Look for the net line and replace bindIp value with 0.0.0.0, ::, to bind all IPV4 and IPV6 addresses, which is currently limiting MongoDB connections to localhost.

# network interfaces
net:
    port: 27017
    bindIp: 127.0.0.1   # change this to 0.0.0.0, to bind to all IP addresses

Note: make sure you have enabled authorization on security: section by adding authorization: 'enabled'(as we’ve already done above), to forbid the access to mongo database on your server.

Restart the mongo daemon(mongod).

Now, you’re good to go ahead.

Conclusion

In this tutorial, you have successfully learned to install MongoDB on EC2 and access from shell as well as Mongo clients.

EC2 related article:

• How To Resize Disk Space In EC2 Instance

Thank you!