Book Image

Mastering Proxmox - Third Edition

By : Ahmed
4 (1)
Book Image

Mastering Proxmox - Third Edition

4 (1)
By: Ahmed

Overview of this book

Proxmox is an open source server virtualization solution that has enterprise-class features for managing virtual machines, for storage, and to virtualize both Linux and Windows application workloads. You'll begin with a refresher on the advanced installation features and the Proxmox GUI to familiarize yourself with the Proxmox VE hypervisor. Then, you'll move on to explore Proxmox under the hood, focusing on storage systems, such as Ceph, used with Proxmox. Moving on, you'll learn to manage KVM virtual machines, deploy Linux containers fast, and see how networking is handled in Proxmox. You'll also learn how to protect a cluster or a VM with a firewall and explore the new high availability features introduced in Proxmox VE 5.0. Next, you'll dive deeper into the backup/restore strategy and see how to properly update and upgrade a Proxmox node. Later, you'll learn how to monitor a Proxmox cluster and all of its components using Zabbix. Finally, you'll discover how to recover Promox from disaster strikes through some real-world examples. By the end of the book, you'll be an expert at making Proxmox work in production environments with minimal downtime.
Table of Contents (17 chapters)

Firewall issues

This section shows issues regarding the Proxmox firewall feature.

Issue – rules are created and a firewall is enabled for vNIC, but rules do not get applied

On rare occasions, due to changes in the network interface or other reasons, the firewall service may get stuck. In such cases, we can restart the service using the following command:

    # systemctl restart pve-firewall

If the previous command does not help, then check the syslog of the node to look for a clue. If nothing helps, then a reboot will clear any firewall issues. As of Proxmox VE 5.0, if a firewall becomes inactive, it does not fall back on a predefined set of protection; a firewall simply becomes nonexistent.

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