Failed global initialization: BadValue: auth is not allowed when noauth is specified

This error occurs when you try to enable authentication for a MongoDB server that is running with the --noauth option. The --noauth option disables authentication, so you cannot enable it after starting the server.

To fix this error, you need to restart the MongoDB server without the --noauth option and then enable authentication. Here are the steps:

1. Stop the MongoDB server using the following command:

sudo systemctl stop mongod

2. Edit the MongoDB configuration file (/etc/mongod.conf) and remove the --noauth option from the command line options.

3. Save the changes and exit the editor.

4. Start the MongoDB server using the following command:

sudo systemctl start mongod

5. Once the server is running, you can enable authentication by creating a user and enabling authentication in the MongoDB configuration file.

Note that enabling authentication may require additional configuration changes, such as configuring SSL/TLS, setting up key files, and configuring authentication mechanisms. Refer to the MongoDB documentation for more information on how to set up authentication.