Question

12

How could I shutdown a remote host, in my network thru ssh, with a local host?

rated 0 times [ 12] [ 0] / answers: 1 / hits: 32919 / 3 Years ago, tue, august 24, 2021, 6:48:34

The question is simple.

What would be the script I would have to use to shut down a computer in my network thru ssh.

Normaly i would go to command line and:

ssh desktop



delik@desktop's password: 



delik@desktop:~$ sudo shutdown -P 0

To power on I created a file and wrote:

wakeonlan xx:xx:xx:xx:xx:xx

And gave it the executable bit

That way to power on it requires only a double click. Would i be capable of doing the same to shutdown?

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fittecanap

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4 Years ago

answered 3 Years ago allowiel · Accepted Answer

For the following I am assuming that the user you are going to use in remote-host is the same you use in local-host.

In order to do what you want, you have to first authorize your local-host to connect to you remote-host with no password. To do that you have to (as described here):

Install ssh:
```
sudo apt-get install ssh
```

Create public and private keys using ssh-key-gen on local-host by entering this command in your localhost:

ssh-keygen

You should save the generated key in:

/home/yourusername/.ssh/id_rsa

Press enter twice to leave the passphrase empty.

Your identification has been saved in /home/yourusername/.ssh/id_rsa.

Your public key has been saved in /home/yourusername/.ssh/id_rsa.pub.

The key fingerprint is:

XX:XX:XX:xX:XX:xX:XX:XX:XX:XX:XX:XX:XX:XX yourusername@local-host

Copy the public key to the remote-host using ssh-copy-id:
```
yourusername@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host

yourusername@remote-host's password:



Now try logging into the machine, with:



ssh remote-host
```
and check in .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting.

Note: ssh-copy-id appends the keys to the remote-host’s /home/yourusername/.ssh/authorized_key.

Login to remote-host without entering the password:
```
ssh remote-host

yourusername@remote-host:~$
```
Access to remote-host with no password. Success!

Now you have to be able to execute sudo shutdown -P 0 with no password. You can do that by modifying /etc/sudoers on remote-host with visudo. That way, user yourusername can execute the shutdown command with no password asked.

Login to the remote-host:
```
ssh remote.host
```

Run:
```
sudo visudo
```
By running visudo, you edit /etc/sudoers in a safe manner.

Add this line to the file:

yourusername ALL = NOPASSWD: /sbin/shutdown

After doing that, get back to your local-host, create a new empty file and paste this line, modifying the remote-host's name:
```
ssh remote.host sudo shutdown -P 0
```

Save and close the file, right-click on it to go to its Properties → Permissions, and tick Execute this file as a program.

Script done!