Installing and Enabling a Quorum Device

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.

On the system assigned to run the quorum device service, run:
```
sudo dnf install -y pcs corosync-qnetd
```
Enable and start the systemd pcsd service by running:
```
sudo systemctl enable --now pcsd
```
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
```
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.
On each of the nodes within the existing cluster, install the corosync-qdevice package by running:
```
sudo dnf install -y corosync-qdevice
```