How to run ssh-keygen non-interactively to generate a SSH key file


If you want to generate a key file using ssh-keygen, it will prompt you for a key password:

$ ssh-keygen -t ed25519 -f id_ed25519´
Generating public/private ed25519 key pair.
Enter passphrase (empty for no passphrase): 

For scripts and automated deployments, however, you want to avoid the prompt and disable the password encryption of the key.


Use -N "" to set an empty password:

ssh-keygen -t ed25519 -f id_ed25519 -N ""

For example:

$ ssh-keygen -t ed25519 -f id_ed25519 -N ""
Generating public/private ed25519 key pair.
Your identification has been saved in id_ed25519
Your public key has been saved in
The key fingerprint is:
SHA256:o/PVrBXpccLOjrVi6vfGWcmNtoubpINfrMxbz4EXtrU uli@uli-desktop
The key's randomart image is:
+--[ED25519 256]--+
|                 |
|                 |
|                 |
|           . .   |
|        S   *.++.|
|       . . B B*+o|
|      o  ...#++E |
|       o.+=%+B.. |
|       .+=X*B.+. |