SSH Server Pubkey Auth

Kevin FOO

Jun 17, 2025

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Setup ssh server that authenticates using pubkey and disable password authentication.

sudo apt install openssh-server -y

Then edit the config file

sudo vim /etc/ssh/sshd_config

Set to the following below

PasswordAuthentication no
PermitRootLogin no
UsePAM no
KbdInteractiveAuthentication no

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PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

In your client, assuming your pubkey is at its default location. Cat the pubkey copy it.

cat .ssh/id_ed25519.pub

Paste the copied pubkey to the server authorized_key

vim .ssh/authorized_key

Restart ssh server

sudo systemctl restart sshd

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