Gitlab: cannot create ssh key

Question

I have this error when I add ssh-rsa key:

The form contains the following error: Key must be at least 4096 bits

To generate ssh-key (private and public) I execute ssh-keygen

Any idea how to solve my problem?

@barrycarter it doesn't work :( ssh-keygen -b option requires an argument -- b usage: ssh-keygen [-q] [-b bits] [-C comment] [-f output_keyfile] [-m format] [-N new_passphrase] [-t dsa | ecdsa | ed25519 | rsa] ssh-keygen -p [-f keyfile] [-m format] [-N new_passphrase] — zackzulg
– zackzulg, Commented Jul 14, 2022 at 15:24
Er, yes, I meant ssh-keygen -b 4096 or something-- I was suggesting you man ssh-keygen and look at the -b option — Barry Carter
– Barry Carter, Commented Jul 14, 2022 at 15:25

VonC · Accepted Answer · 2022-07-14 19:42:15Z

3

For testing, you can use a passphrase-less key with, while specifying the number of bits in the key to create:

 ssh-keygen -t rsa -b 4096 -P "" -f ~/.ssh/gitlab

If you need to copy the public key to GitLab, use the ~/.ssh/gitlab.pub file content.

To test it, create a ~/.ssh/config file with:

Host gitlab
  Hostname gitlab.com
  User git
  IdentityFile ~/.ssh/gitlab

And ssh -Tv gitlab to check if you get a Welcome message, confirming you are properly authenticated.

answered Jul 14, 2022 at 19:42

VonC

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