Скачать или смотреть Solving the Access Denied Error in MariaDB: Granting Permissions to New Users

Learn how to resolve the `Access Denied for User 'root'@ 'localhost'` error in MariaDB when trying to grant permissions to a new user. Step-by-step guidance provided here!
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This video is based on the question https://stackoverflow.com/q/72862895/ asked by the user 'user1666858' ( https://stackoverflow.com/u/1666858/ ) and on the answer https://stackoverflow.com/a/72863644/ provided by the user 'danblack' ( https://stackoverflow.com/u/10195153/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Access Denied Error in MariaDB

If you are facing the Access denied for user 'root'@ 'localhost' (using password: YES) error when trying to grant privileges to a new user in MariaDB, you're not alone. Many database administrators encounter this hurdle, especially when they believe they have the necessary permissions.

In this guide, we will take you through the process of understanding this error and solutions to effectively resolve it.

Understanding the Problem

Let's break down the issue:

You've successfully logged in to MariaDB as the root user using the command:

[[See Video to Reveal this Text or Code Snippet]]

You created a new user without issues:

[[See Video to Reveal this Text or Code Snippet]]

However, attempting to grant privileges leads to an access denied error:

[[See Video to Reveal this Text or Code Snippet]]

Despite having sufficient permissions, you still encounter problems when trying to access the database application.

Common causes of this problem often relate to missing privileges for the root user, particularly DELETE HISTORY, which can prevent granting all permissions effectively.

Solution Steps

1. Check Current Grants for the Root User

The first step is to verify the current privileges assigned to root@ localhost. You can do this by running the command:

[[See Video to Reveal this Text or Code Snippet]]

Notice if you see a list of privileges or just a single line indicating GRANT ALL PRIVILEGES ON .... The former suggests that there may be missing permissions.

2. Compare Privileges

To troubleshoot further, create a new user and check its privileges against those of root@ localhost. This comparison can shed light on what might be missing.

Create a new user:

[[See Video to Reveal this Text or Code Snippet]]

Check grants for both users:

[[See Video to Reveal this Text or Code Snippet]]

If you observe that root@ localhost is missing certain privileges that testuser has, then that’s the likely cause of your issue.

3. Adjust Privileges as Necessary

If you identify specific missing privileges, you can modify root@ localhost grants to include them. If DELETE HISTORY is indeed missing, consider adding it or granting the necessary privileges explicitly.

For example, you can run:

[[See Video to Reveal this Text or Code Snippet]]

Add any missing privileges that you’ve identified during your comparison.

4. Verification After Changes

After making these adjustments, you should verify the successful update of privileges:

[[See Video to Reveal this Text or Code Snippet]]

Try again to grant the all privileges to your new user:

[[See Video to Reveal this Text or Code Snippet]]

5. Testing Application Access

Check if your application begins to function normally with the newly granted permissions. If problems persist, ensure you correctly referenced the host for your new user and that the database is being accessed properly.

Conclusion

The Access Denied for User error can be frustrating, but by methodically checking your privileges and understanding the structure of user grants within MariaDB, you can rectify these issues. Always remember to keep a close eye on the privileges you assign and verify them regularly, especially when changing user roles.

Feel free to reach out if you have further questions or run into additional issues. Happy database management!