Installation of the quorum device requires that you install the pcs and corosync-qnetd packages on the system where you intend to run the quorum device service and then install the corosync-qdevice package on each of the nodes in the existing cluster.

1. On the system assigned to run the quorum device service, run:

   sudo dnf install -y pcs corosync-qnetd

2. Enable and start the systemd pcsd service by running:

   sudo systemctl enable --now pcsd

3. If you're running a firewall on the quorum device service host, you must open the firewall ports to allow the host to communicate with the cluster. For example, run:

   sudo firewall-cmd --permanent --add-service=high-availability
   sudo systemctl restart firewalld

4. On the quorum device service host, enable and start the quorum device service by setting the Pacemaker configuration for the node to use the net model. Run:

   sudo pcs qdev setup model net --enable --start

   This command creates a configuration for the host and names the node qdev. It sets the model to net and enables and starts the node. The command triggers the corosync-qnetd daemon to load and run at boot.

5. On each of the nodes within the existing cluster, install the corosync-qdevice package by running:

   sudo dnf install -y corosync-qdevice