To install a Proxmox QDevice (Quorum Device) on TrueNAS SCALE, the most stable and "native" method is to use a Sandbox (Jailmaker). This keeps the host OS clean while allowing you to run a standard Debian/Ubuntu environment where corosync-qnetd can reside. [1, 2] 
Step 1: Create a Sandbox on TrueNAS SCALE
If you haven't already, install [jailmaker](https://github.com/Jip-Hop/jailmaker) (a popular tool for managing LXC-like "sandboxes" on SCALE). [2, 3] 

   1. Open the TrueNAS Shell and navigate to your pool:
   
   cd /mnt/<YOUR_POOL>/jailmaker/
   
   2. Create a new sandbox (e.g., named qdevice):
   
   ./jlmkr.py create qdevice
   
   Choose Debian or Ubuntu as the OS when prompted.
   3. Start and enter the sandbox:
   
   ./jlmkr.py start qdevice
   ./jlmkr.py shell qdevice
   
   
Step 2: Install QNetd in the Sandbox
Now that you are inside the container/sandbox:

   1. Update and install the daemon:
   
   apt update && apt upgrade -y
   apt install corosync-qnetd -y
   
   2. Enable the service:
   
   systemctl enable --now corosync-qnetd
   
   3. Set a root password (Proxmox needs this to push certificates via SSH):
   
   passwd root
   
   4. Allow Root SSH Login (temporary requirement for setup):
   * Edit /etc/ssh/sshd_config and set PermitRootLogin yes.
      * Restart SSH: systemctl restart ssh (or sshd). [4, 5, 6, 7, 8] 
   
Step 3: Link to your Proxmox Cluster [9] 
Go to any Proxmox node's shell and run the setup command, pointing it to your TrueNAS sandbox IP. [7, 9] 

   1. Install the client on all Proxmox nodes:
   
   apt update && apt install corosync-qdevice -y
   
   2. Initialize the connection from one Proxmox node:
   
   pvecm qdevice setup <TRUENAS_SANDBOX_IP>
   
   Follow the prompts to accept the SSH fingerprint and enter the root password you set in Step 2.

Step 4: Verify Quorum
Check the status on your Proxmox node: [7, 10] 

pvecm status

Under Votequorum Information, you should now see 3 total votes (2 nodes + 1 QDevice), ensuring your cluster stays online even if one Proxmox node fails.
------------------------------
Pro-tip: For the best stability, ensure your Sandbox has a Static IP so Proxmox doesn't lose the connection after a reboot. [8, 11] 
Do you need help configuring a static IP or automatic startup for this sandbox on TrueNAS?

[1] [https://www.reddit.com](https://www.reddit.com/r/truenas/comments/1bhud3y/jailmakersandboxes_is_a_gamechanger_for_lowend/)
[2] [https://www.truenas.com](https://www.truenas.com/docs/scale/24.04/scaletutorials/apps/sandboxes/)
[3] [https://ryeroxley.com](https://ryeroxley.com/index.php/2024/06/04/how-to-install-jailmaker-on-truenas-scale/)
[4] [https://forum.proxmox.com](https://forum.proxmox.com/threads/how-to-run-a-qdevice-in-docker.141679/#:~:text=FROM%20debian:bullseye%20RUN%20echo%20%27debconf%20debconf/frontend%20select,%2Ds%20EXPOSE%205403%20CMD%20%5B%20%22/sbin/init%22%20%5D)
[5] [https://www.apalrd.net](https://www.apalrd.net/posts/2022/cluster_qdevice/)
[6] [https://github.com](https://github.com/bcleonard/proxmox-qdevice)
[7] [https://www.apalrd.net](https://www.apalrd.net/posts/2022/cluster_qdevice/)
[8] [https://www.youtube.com](https://www.youtube.com/watch?v=VqyqsKUawRI)
[9] [https://www.saturnme.com](https://www.saturnme.com/how-to-install-and-configure-qdevice-for-a-2-node-proxmox-ve-cluster/)
[10] [https://www.truenas.com](https://www.truenas.com/community/threads/corosync-qdevice-in-a-jail.109045/)
[11] [https://www.truenas.com](https://www.truenas.com/docs/scale/scaletutorials/network/containernasbridge/#:~:text=After%20adding%20the%20bridge%20and%20to%20assign,access%20your%20TrueNAS%20storage%20from%20the%20container.)