[Rocky] add new user to use SSH key

sudo add user xxxxx

sudo passwd xxxxx

#enter password to login console

sudo usermod -aG wheel xxxxx  #add  sudo permission

sudo mkdir -p /home/newuser/.ssh

sudo chmod 700 /home/newuser/.ssh

sudo chown newuser:newuser /home/newuser/.ssh  

#generate key with default opt 

ssh-keygen

#Cài OpenSSH lên windows 11:

Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0
Start-Service sshd
Set-Service -Name sshd -StartupType 'Automatic'
New-NetFirewallRule -Name sshd -DisplayName "OpenSSH Server (sshd)" -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 22
 

#rename file public key, copy file private key về PC:

cd /home/xxxxx/.ssh

mv id_rsa.pub authorized_keys 

scp id_rsa userpc@PCip:/C:/Users/userpc/.ssh

#copy publick key to rocky:

scp userpc@PCip:/C:/Users/userpc/.ssh/authorized_keys .ssh

Nếu kết nối báo key bị từ chối (server refused our key): 

di chuyển vào thư mục .ssh và chmod cho file key về 600:

chmod 600 authorized_keys