ssh cheatsheet

Jul 31, 2024 • Cheatsheet/ssh • 1 min read

To use this script:

Generate an SSH key pair if you haven't already:
```
ssh-keygen -t rsa -b 4096 -f ~/.ssh/nas_rsa
```

Copy the public key to the NAS:

ssh-copy-id -i ~/.ssh/nas_rsa.pub [email protected]

On the NAS, configure sudo to allow the admin user to run poweroff without a password. Add this line to the sudoers file (use visudo):
```
admin ALL=(ALL) NOPASSWD: /sbin/poweroff, /sbin/shutdown
```
Save the script with a .sh extension (e.g., nas_shutdown.sh), make it executable (chmod +x nas_shutdown.sh), and run it.

Attempt to shut down the NAS

if ssh -i "$SSH_KEY_PATH" -o StrictHostKeyChecking=no -o ConnectTimeout="$TIMEOUT" "$ADMIN_USER@$NAS_IP" 'sudo -n poweroff'; then
    log_message "Shutdown command sent successfully to NAS"
else
    log_message "Error: Failed to send shutdown command to NAS"
    exit 1
fi