Example of how to reboot a Synology with a SSH rule

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I was looking for a solution to restart my always running Synology NAS like the System or Pimatic sudo reboot rule.

My steps for a working SSH connection Raspberry Pi to Synology:

SSH to Raspberry Pi

pi@raspberrypi (SSH login)

pi@raspberrypi> sudo passwd root
pi@raspberrypi> su root
root@raspberrypi> ssh-keygen -t rsa (without passphrase, in default folder)
root@raspberrypi> cd .ssh
root@raspberrypi> dir (shows id_rsa and id_rsa.pub private an public key file)
root@raspberrypi> cat id_rsa.pub (public key seems correct)
root@raspberrypi> ssh-copy-id root@192.168.1.100 (copy public key to Synology)

SSH to Synology

root@Synology-DiskStation (SSH login)

DiskStation> cd .ssh
DiskStation> dir (shows a known_host and the copied authorized_keys public key file)
DiskStation> cat authorized_keys (public key seems correct, equal with id_rsa.pub on Raspberry Pi)
DiskStation> cd
DiskStation> chmod 700 .ssh
DiskStation> chmod 644 .ssh/authorized_keys

Pimatic device

{
  "id": "system-restart",
  "name": "System Restart",
  "class": "ButtonsDevice",
  "buttons": [
    {
      "id": "system-restart-synology",
      "text": "Synology"
    }
  ]
},

Pimatic rule

{
  "id": "system-action-restart-synology",
  "name": "system-restart-synology",
  "rule": "if system-restart-synology is pressed then execute \"ssh root@192.168.1.100 'echo C >/dev/ttyS1'\"",
  "active": true,
  "logging": true
}

Synology command options

echo 1 >/dev/ttyS1

echo 1 = Power Off,
echo 0 = Button power,
echo C = Reset.

With execute. execute “your command”

With an url:

execute “curl http://<your-ip>:<your-port>/jsonrpc?request=<url-encoded-request> >/dev/null 2>&1”

I have the same problem only with my freenas. Tried to sudo npm install pimatic-wol but didn’t work.
Also i would like to know how this could this implemented into rule or device. Maybe something like a wol plugin?

if i understand you right it shouldnt be that hard. I have a created a switch in pimatic to power off/on my media server:

{
      "id": "servergreen",
      "name": "Media-Server",
      "class": "ShellSwitch",
      "onCommand": "sudo etherwake 6c:f0:49:74:xx:xx",
      "offCommand": "ssh georg@192.168.1.37 sudo poweroff"
}

note: Etherwake infos here: Has to be installed on your NAS.

There were some problems because pimatic creates the ssh session as the wrong user. You have to transfer the right rsa-keys so pimatic is allowed to ssh poweroff (also described here). If this is what you search i have to take some time and look up what exactly i did.

Pimatic doesn’t recognise etherwake or wakeonlan throws error, how do you deal with that?

Install etherwake: sudo apt-get install etherwake

@pimagic
guess you’ve already installed the shell-execute plugin.
you want to connect on port 22?
try execute "ssh username@192.168.1.100:22 -pw password poweroff"
or execute "ssh username@192.168.1.100 -p22 -pw password poweroff"

hm … guess above won’t work at all. maybe this helps.
I totally forgot about it. Did so to control another Pi!

http://www.linuxproblem.org/art_9.html

@leader21 -p22 or :22 gave a bad port error:

error [pimatic]: Error on evaluation of rule condition of rule system-action-restart-synology: Command failed: Bad port ‘w’

“ssh root@192.168.1.100 22” or “ssh root@192.168.1.100 22 -pw password poweroff” gave the same error (password is useless?):

error [pimatic]: Error on evaluation of rule condition of rule system-action-restart-synology: Command failed: Host key verification failed.

Thats why a RSA key is propably required. You don’t need a password anymore?

@pimagic said:

Thats why a RSA key is propably required. You don’t need a password anymore?

that’s correct.
the -pw at your above command will open a port called w, thats why this is not working.
if you go for the rsa key method you do not need to enter a password anymore.
try it and pls report back

Here you go:
information: Pimatic runs as root. If you want to ssh from pimatic to another computer the other computer needs the rsa keys of root.

1. Create password for root:
   sudo passwd root

2. Login as root:
   su root

3. Create root-rsa key:
   ssh-keygen -t rsa

4. Copy the root-rsa key to your server/nas:
   sudo cat /root/.ssh/id_rsa.pub | ssh user@server 'cat >> .ssh/authorized_keys’

Have to say: im no linux pro like others here but i did this yesterday and it worked for me. If it doesnt work for you google around it at let us know what the error of your pimatic rule gives.

@thymian Great that was doing the job, SSH connection finally, thanks!

And a working rule execute “ssh root@192.168.1.100 ‘echo C >/dev/ttyS1’”

I think a beter way for reboot and shutdown is the following:
reboot: execute "ssh root@192.168.1.100 ‘reboot’"
shutdown: execute “ssh root@192.168.1.100 ‘shutdown -h now’”

In this case the nas first stops al packages before going power down or reboot. Instead of doing this quite abrubt