MongoDB – Create New User

After the MongoDB installation, I continued with creating a new root user which carries the admin right with password. It is recommended to secure the database with password all the time.

To do so, I used the Mongo command shell to run the commands.
1. Create the root user.

db.createUser({user:"admin", pwd:"admin123", roles:[{role:"root", db:"admin"}]})

The command prompt will show success message once the new user is created.

2. Enable Mongodb authentication
Edit the Mongodb service file ‘/lib/systemd/system/mongod.service’ with your editor on the ‘ExecStart’ line 9, add the new option ‘–auth’.

ExecStart=/usr/bin/mongod --quiet --auth --config /etc/mongod.conf

And here is where I faced the same problem again, I am unable to edit the file using the text editor because of the permission. If you able to edit, then continue with below steps.

3. Reload the systemd service using systemd daemon-reload
4. Restart MongoDB service.
5. Connect to the Mongodb shell with this command:
mongo -u admin -p admin123 –authenticationDatabase admin

Fill in using the userID and password set when we create new root user. Even I did not change the file, mongod.service, I am still able to connect to the MongoDB with my own userID and password. Below, showed the success login.

Lastly, you can show or list the databases by using command,

show dbs
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