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I'm trying to setup Gitlab server. It flashes an error "Fingerprint cannot be generated" while adding ssh keys. I googled for the solutions and found a few possible problems that could cause this problem.

First was to ensure proper access from SELinux. Since I don't have SElinux installed, it can't be a problem.

Second was to make sure that ssh-keygen is installed and the keys generated do not have a pass phrase associated to it. Checked it and no issues.

Third was to check that user git can access the tmp directory created by Gitlab. I checked that too.

This is the link I followed to set gitlab.

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  • The permissions of /tmp should be 1777. All users can write there. Are you sure you have diagnosed your problem correctly? The git user needs access to a tmp directory inside the Gitlab source dir structure afaik & that may have to be adjusted, but not /tmp ?
    – Zanna ♦
    Sep 25, 2016 at 6:40
  • @Zanna I didn't know that. Anyway, I just checked for tmp inside Gitlab, made it accessible and it's still the same. Any other possible reason?
    – 7_R3X
    Sep 25, 2016 at 8:01
  • I don't know, but what makes you think it's a perms issue? Could you edit your question with a link to the instructions you're following or add more detailed error messages?
    – Zanna ♦
    Sep 25, 2016 at 8:03
  • @Zanna : Just changed the question. I'm not sure where to find the logs as I'm new to it.
    – 7_R3X
    Sep 25, 2016 at 8:38
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    +1 to your question & hope someone can answer it.
    – Zanna ♦
    Sep 25, 2016 at 8:48

1 Answer 1

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The problem is that the version of Gitlab installed from those instructions (version 6.9.2) is too old (current version is 8.14) - ssh-keygen was then outputting MD5 based Fingerprint hashes; the default is now SHA256. The solution, as garnered from - Fixing gitlab's "Fingerprint cannot be generated" error - is as follows:

  • Edit <path-to-gitlab>/app/models/key.rb
  • Change this line

cmd_output, cmd_status = popen(%W(ssh-keygen -lf #{file.path}), '/tmp')

  • With this one

cmd_output, cmd_status = popen(%W(ssh-keygen -E md5 -lf #{file.path}), '/tmp')

  • Restart Gitlab
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