What should I do if I added a public key to gitlab but still don’t have access rights?

In our daily use of GitLab for code management, a problem we often encounter is "GitLab added the public key, but still does not have access rights." This problem particularly affects the progress of daily work for developers who use GitLab to achieve team collaboration. Therefore, it is necessary for us to understand the cause of the problem and how to solve it.

1. Cause of the problem

Adding a public key in GitLab is an authentication method based on the SSH protocol. When we create an SSH key on GitLab, we will get two files, one is the private key file and the other is the public key file. When adding a public key, we need to copy the public key contents to the SSH key in the user's personal settings. After adding the public key correctly, we only need to use the private key for authentication.

But sometimes, even if we add the SSH public key correctly, we still encounter the problem of no access rights. Why is this?

One possibility is that we did not add the correct public key, or the SSH key is not our own key. In addition, there are several possible reasons:

• The permissions of the authorized_keys file on the server are incorrectly set, and the file cannot be read, causing authentication failure.
• There is an error message in the local known_hosts file, causing the SSH connection to fail.
• The SSH public key in GitLab was added incorrectly and was not bound to the correct user.

2. Solution

When dealing with the problem that GitLab has added a public key and still has no access rights, we need to first check whether the public key and related settings are correct. The following are some general solutions:

• Check whether the public key and private key are correct: We need to check whether the local SSH private key and the public key added on GitLab match. If the public and private keys do not correspond, It will definitely cause authentication failure, and the SSH key needs to be regenerated and added to GitLab.
• Check authorized_keys file permission issues: Authorized_keys file permission issues on the server may prevent us from accessing GitLab. We need to confirm that the authorized_keys file has the correct permissions set, ensure that its owner is the Git user, and that the Git user has read permissions for the file.
• Conduct SSH connection test: We need to enter "ssh -T git@gitlab.example.com" through the command line, and enter "yes" to confirm when prompted. If "Welcome to GitLab" appears The SSH public key has been added correctly.
• Delete the known_hosts file: If the SSH connection fails, the reason may be that there is a lot of wrong information in the existing known_hosts file. We can delete the file and regenerate it by trying the SSH connection again.
• Check whether the SSH public key and user match. The SSH public key in GitLab must be correctly bound to the correct user, otherwise the project resources on GitLab will not be accessible.

3. Summary

Adding a public key to GitLab is a way to use the SSH protocol for authentication. It often happens that GitLab adds a public key and still does not have access rights. The problem. When solving this problem, we need to check whether the public key and related settings are correct, such as checking whether the public key and secret key match, checking authorized_keys file permission issues, performing SSH connection testing, etc.

As long as the steps are followed correctly, I believe this problem can be solved in most cases.

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