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A step-by-step guide on addressing the `401 Unauthorized` error when trying to register a GitLab Runner with your GitLab instance.
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This video is based on the question https://stackoverflow.com/q/68350421/ asked by the user 'Amie Joni' ( https://stackoverflow.com/u/11112262/ ) and on the answer https://stackoverflow.com/a/68744795/ provided by the user 'orespan' ( https://stackoverflow.com/u/11079609/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Resolve 401 Unauthorized Error When Registering GitLab Runner

If you're working with GitLab CI/CD and have ever attempted to register a GitLab Runner only to be greeted with a 401 Unauthorized error, you're not alone. This issue often arises when there are authentication hurdles that prevent the runner from connecting to the GitLab server. In this post, we'll explore a common scenario involving this problem and present a straightforward solution.

The Problem

When you attempt to register a GitLab Runner with a command like:

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

You may encounter an immediate error message:

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

This indicates that your runner cannot access the GitLab instance due to the required authentication that isn't being fulfilled.

Understanding the Cause

The reason for the 401 Unauthorized error typically revolves around the fact that the GitLab instance is secured with HTTPS, requiring proper authentication before granting access. Simply using HTTP in your registration command fails to provide the necessary credentials, resulting in the unauthorized response.

The Solution: Use HTTPS for Registration

To resolve this problem, a simple adjustment is often all that's needed. Instead of using HTTP, you should register the runner with HTTPS. Here’s how:

Step-by-Step Guide

Change the URL: Instead of registering with HTTP, ensure that you use the HTTPS URL of your GitLab instance. Modify your command as follows:

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

Execute the Command: Run the modified command in your terminal. This should include the necessary authentication and thus, grant your runner access to the GitLab instance.

Authentication: If prompted, provide the username and password for your GitLab account. In case you've set up credential storage previously, ensure it's functioning properly to avoid repeated prompts.

Benefits of this Approach

Enhanced Security: Utilizing HTTPS ensures that data transmitted between your GitLab Runner and the GitLab server is encrypted, protecting sensitive information such as usernames and passwords.

Streamlined Process: Using HTTPS can simplify your workflow and reduce friction when trying to connect or register various runners in the future.

Conclusion

The 401 Unauthorized error when registering a GitLab Runner often stems from trying to connect via HTTP instead of HTTPS. By implementing the changes outlined above, you should be able to secure your runner's registration with your GitLab instance and bypass these authentication issues.

If you continue to face hurdles, double-check your GitLab credentials or consult your system administrator for further assistance. Happy coding!