proxmox add QDevice

[admin]

Prepare the External QDevice Server
Install the netdaemon package on the external Debian/Ubuntu system:

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sudo apt install corosync-qnetd

Enable root SSH access temporarily by editing /etc/ssh/sshd_config and setting PermitRootLogin yes.
Set a root password using sudo passwd root and restart the SSH service:

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sudo systemctl restart ssh

Install QDevice on Proxmox Nodes
Run the following command on all Proxmox VE cluster nodes to install the client package:

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apt update && apt install corosync-qdevice

Initialize and Configure the QDeviceFrom only one of your Proxmox cluster nodes, run the setup command referencing your external QDevice IP address:

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pvecm qdevice setup <qdevice_ip_address>

Accept fingerprints or input credentials if prompted. The command safely distributes configuration files and certificates across the cluster.Verify the StatusCheck that the quorum device is actively communicating and providing a vote by running:

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pvecm status