How to enable auth and create user in mongodb?

To enable authentication and create a user in MongoDB, you’ll need to follow these steps:

Step 1: Enable Authentication

Open the MongoDB configuration file:

• The MongoDB configuration file is typically located at /etc/mongod.conf on Linux systems. The exact location might differ depending on your installation method and operating system.
• Open the file using a text editor. For example

sudo nano /etc/mongod.conf

Enable authentication:

• In the configuration file, find the security section and add the following line:

security:
  authorization: enabled

If the security section doesn’t exist, you can add it.

Step 2: Create an Administrative User

Start the MongoDB shell:

• You can start the MongoDB shell by running:

mongo

Switch to the admin database:

• Switch to the admin database where administrative users are usually stored:

use admin

Create an admin user:

• Use the following command to create a new administrative user with the userAdminAnyDatabase role:

db.createUser({
  user: "admin",
  pwd: "adminPassword",
  roles: [{ role: "userAdminAnyDatabase", db: "admin" }]
})

Replace "admin" with your desired username and "adminPassword" with a strong password.

Exit the MongoDB shell:

• Type exit to leave the MongoDB shell.

Restart MongoDB:

• After saving the changes to the configuration file, restart MongoDB to apply the changes:

sudo systemctl restart mongod