Simple usage of ssh keys

Check existing keys:

ls ~/.ssh 

If no, generate a new key pair using ed25519 encryption:

ssh-keygen -t ed25519 # default use user@hostname

Get the public key:

cat ~/.ssh/id_ed25519.pub

You can give this public key to cluster manager or set it on GitHub to let this machine access the cluster or clone private repo via ssh.

For example, in ~/.ssh/config, we point the identity file to our private key path to access the remote machine (which stores our public key).

Host remote1
	HostName 192.168.0.1
	User me
	IdentityFile ~/.ssh/id_ed25519 # private key