SSH Key Setup and Configuration for Passwordless Login

[Premas]

What would you like to see added?

SSH key authentication was failing on Cheaha, causing password prompts for both SSH and Open OnDemand (OOD) shell access. The issue was resolved by adding the ECDSA public SSH key to authorized_keys on login006:

cat ~/.ssh/id_ecdsa.pub >> ~/.ssh/authorized_keys

Write-up to be Added

Client-side setup (PC):

1. How to generate SSH keys (e.g., ssh-keygen -t ecdsa)

2. Adding the private key to the SSH agent (ssh-add ~/.ssh/id_ecdsa)

Server-side setup (Cheaha):

1. Adding the public key to ~/.ssh/authorized_keys on login006

2. Setting correct permissions: For instance,
   ~/.ssh/authorized_keys → 600

Where to add this?

https://docs.rc.uab.edu/cheaha/getting_started/

[bdu-birhanu]

Would it be ok to add the list of public key fingerprints, that need to be added to ~/.ssh/known_hosts, to our docs?
@wwarriner may also add details or comments on this.