In this chapter, we learned about one of the most powerful features of Proxmox, the built-in firewall. We learned what it is and how to implement it to protect the entire cluster, Proxmox host nodes, and virtual machines. We learned how to manage the firewall rules and configuration using both the GUI and CLI. Proxmox adds security where it is needed the most. By leveraging a flexible and granular firewall protection at a hypervisor level, we are now able to have a better, secured cluster.
In the next chapter, we are going to learn about the Proxmox High Availability feature for VMs, which has been completely redesigned from the ground up. The new changes have brought higher stability while making management and configuration a much simpler task.