We want that our NUT sends a shutdown order when there is not suply and the battery goes down. But it could be useful too to shut down a Cybertheque computers, computer classroom, ….
For this we must install a SSH server in Negro (WinXP). And generate a simetric RSA key for connecting automatically and secure.
We will install freeSSHd (http://freesshd.com), it is a free ssh server for windows, based on OpenSSH.
- We will install as a service in order to start when the system boots.
- Create an ups user who login with Public Key:
In the server upsd machine create the keys and their permissions (read and write only the root) for better security:
elite:~# ssh-keygen -t rsa -q -f /etc/nut/rsa_ups Enter passphrase (empty for no passphrase): Enter same passphrase again: elite:~# chmod 600 /etc/nut/rsa_up*
Copy the public file (rsa_ups.pub) to C:\Archivos de programa\freeSSHd\:
Renaming rsa_ups.pub with the user name: C:\Archivos de programa\freeSSHd\ups
Now Windows PC must accept tothe command (using the private key):
ssh -i /etc/nut/rsa_ups ups@negro.lebrijo.com “shutdown -s -f -t 60″
In our NUT we will do:
- Create the script with shutdown orders apagado_sistema.sh:
#!/bin/sh
# Shutting down the desctop computer (if it will be up) ssh -i /etc/nut/rsa_ups ups@negro.lebrijo.com “shutdown -s –f” # Shutting down the server /sbin/shutdown -h +0
- Change the permissions, to execute the script:
chmod 744 /etc/nut/*.sh