Getting SMART data without sudo?

[molnart]

I am trying to get smart data from my Proxmox drives. Proxmox has no sudo installed, nor I want to install it. I have enabled the smart plugin, but the agent is showing these errors:

check 'smart.disk.discovery' is not supported: Cannot fetch data: Failed to scan for devices: Cannot unmarshal JSON: invalid character 's' looking for beginning of value..

I suspect this is because the agent is trying to run smartctl as sudo.
The issue has been already mentioned here https://www.zabbix.com/forum/zabbix-...ge4#post450246 but with no apparent solution.

[troffasky]

What user is the Zabbix agent running as? Does that user have permission to run smartctl? If it's simply not necessary to use sudo then remove that from the script.

[molnart]

how do i remove sudo from the script? i was under the assumption that sudo is baked in into the code. zabbix agent is running under the zabbix user and is able to get data from smartctl

[troffasky]

Ahh OK, I assumed this was some agent parameter with a script.
But it looks like, as you say, it's hard-coded. Not much you can do to fix that.

https://www.zabbix.com/integrations/smart#content_smart_agent2

Best workaround I can think of is to create a dummy "sudo" script that just passes everything through, and setuid root on the smartctl binary [if your Zabbix user isn't able to run it].

[carles]

Maybe you can do that from the API: https://pve.proxmox.com/pve-docs/api-viewer/#/nodes/{node}/disks/smart

You can access it through shell: pvesh get /nodes/{node}/disks/smart

Hope it helps!

[wib5y]

Not sure if this will help in your case, however this was what worked in my case (Proxmox 8.3 and Zabbix 7.0.6):

1. Install sudo
2. Create a new sudoers file e.g. /etc/sudoers.d/zabbix
3. Add zabbix ALL=(ALL) NOPASSWD: /usr/sbin/smartctl to the new file
4. Change the permissions of the file to 0440
5. Check the config with visudo -c to make sure all is correct and that's it