[Solved] ssh to another host does not work: Host key verification failed.

---

Hey,

I tried to use a shellsensor to connect with ssh to another host and read some data. My pub key is configured and the command is working in shell:

pi@raspberrypi:~ $ ssh root@192.168.38.102 cat /sys/class/i2c-adapter/i2c-1/1-0010/ambient
353
pi@raspberrypi:~ $

When trying this in pimatic shell sensor it does not work:

error [pimatic-shell-execute,ShellSensor]: Error getting attribute value Umgebungslicht_Squeezebox_unten.Licht: undefined
error [pimatic-shell-execute]: [ShellSensor#Umgebungslicht_Squeezebox_unten] Error: Command failed: /bin/bash -c ssh root@192.168.38.102 cat /sys/class/i2c-adapter/i2c-1/1-0010/ambient
Host key verification failed.

Here the device:

    {
      "attributeName": "Licht",
      "attributeType": "number",
      "command": "ssh root@192.168.38.102 cat /sys/class/i2c-adapter/i2c-1/1-0010/ambient",
      "interval": 60000,
      "id": "Umgebungslicht_Squeezebox_unten",
      "name": "Umgebungslicht Squeezebox unten",
      "class": "ShellSensor"
    }

Is that a general problem of key authentification when using shell-plugin?

@Anduril said in ssh to another host does not work: Host key verification failed.:

Is that a general problem of key authentification when using shell-plugin

No. See https://forum.pimatic.org/topic/1827/solved-pimatic-ssh-rules-are-giving-error-host-key-verification-failed

Thanks @mwittig, so root has it’s own list of trusted hosts… that works now. Solving this one opens another problem for me: the private key I use in shell is not used by root, so the connection gets a permission denied. Where do I have to put my private key to be also used by root?

@Anduril said in ssh to another host does not work: Host key verification failed.:

Where do I have to put my private key to be also used by root?

You need to place the keys (e.g., id_rsa and id_rsa.pub) in /root/.ssh.
Make sure the private key is only r/w acessible for root.

thank you, it’s working now.