What is Proxmox?

Timo Wevelsiep•Updated: 01.07.2026

Editorial note: Versions, commands and prices may change. Please verify critical steps independently before production use. This guide does not replace individual consulting.

Proxmox Virtual Environment (Proxmox VE or PVE for short) is an open-source platform for virtualization and containers. It lets companies run virtual machines and containers on their own hardware, managed centrally through a web interface, with no per-core licensing costs. Proxmox is arguably the best-known open-source alternative to VMware vSphere and Microsoft Hyper-V.

Proxmox VE is based on Debian GNU/Linux and combines two virtualization technologies in one product: KVM for full virtual machines and LXC for lightweight Linux containers. It is licensed under the AGPLv3, owned by the Austrian company Proxmox Server Solutions GmbH, and ties you to no vendor, neither for hardware nor for operations. That is the decisive difference from proprietary platforms whose vendors can change prices or restructure products, as recently happened with VMware after the Broadcom acquisition.

What Proxmox is used for

Proxmox is the foundation for your own private cloud. Typical use cases:

Server consolidation: Many physical servers are merged onto a few powerful nodes running dozens of VMs and containers.
Replacing VMware: Companies migrate away from costly vSphere licensing to an economical, sovereign platform.
High availability: Business-critical applications run resilient in a cluster; if a node fails, VMs restart automatically on another.
Test and development environments: Quickly provisioned, isolated environments with snapshots and clones.
Hosting open-source applications: Nextcloud, GitLab, databases and more, cleanly separated in their own VMs or containers.

How Proxmox is structured

A Proxmox setup consists of a few clearly defined building blocks:

KVM (Kernel-based Virtual Machine) is the hypervisor for full virtual machines. Any guest OS, including Windows, runs on it.
LXC (Linux Containers) provides resource-efficient containers that share the host kernel, ideal for many small Linux services.
The web interface manages nodes, VMs, containers, storage and networking centrally in the browser. Everything is also controllable via a REST API and the command line.
Clustering via Corosync joins multiple nodes into a federation with shared management.
Storage: Proxmox supports ZFS, Ceph, LVM, NFS and more, from a local disk to distributed, highly available storage.
Proxmox Backup Server (PBS) adds deduplicated, incremental and encrypted backups to the platform.

This manageable architecture is one reason Proxmox runs reliably, from a single server to a multi-node cluster.

What Proxmox actually does

Beyond simply starting VMs, Proxmox handles the tasks that make production operations practical:

High availability (HA): If a node fails, VMs are automatically restarted on a healthy node.
Live migration: Running VMs are moved between nodes without interruption, e.g. for maintenance.
Snapshots and clones: Freeze states, roll back or create templates for new systems.
Integrated firewall: Rules at cluster, node and VM level.
Role and permission management: Fine-grained access control, including LDAP or OpenID integration.
Backup and restore: Scheduled backups, deduplicated and encrypted with PBS.

Proxmox vs. VMware vs. Hyper-V

	Proxmox VE	VMware vSphere	Microsoft Hyper-V
Model	Open source (AGPLv3)	Proprietary	Proprietary
Licensing cost	None (optional support subscription)	Core-based subscription	Windows Server licence
Virtualization	KVM (VMs) + LXC (containers)	ESXi hypervisor	Hyper-V hypervisor
Vendor lock-in	None	High	Medium (Microsoft ecosystem)
Storage	ZFS, Ceph, LVM, NFS and more	vSAN, VMFS	Storage Spaces
Data sovereignty	Full, your own infrastructure	At setup, but costly	Microsoft-centric
Best for	Sovereign private cloud without a licensing trap	Existing VMware estates	Windows-centric environments

Honestly: for an existing, deeply integrated VMware estate a switch can mean effort. But once licensing cost, data sovereignty or independence matter, many companies find no way around Proxmox, it is the most mature open-source standard.

When Proxmox is worth it

Proxmox is the right choice if you:

want to cut licensing costs, especially after the VMware price changes,
need data sovereignty and want to control your infrastructure yourself,
run a private cloud on your own or rented hardware (e.g. at Hetzner),
need high availability without expensive add-on licences,
or want to stay independent of a single vendor.

For a single small system a single-node setup is often enough. From production use with several applications onward, a cluster becomes the sensible foundation.

Next steps

In the other articles of this hub we show how to set Proxmox up cleanly, migrate from VMware and build a high-availability cluster. If you'd rather not run Proxmox yourself, we handle design, setup and operations: learn more on our Proxmox & Private Cloud page and about migrating from VMware to Proxmox.

You'd rather not run Proxmox yourself? WZ-IT handles setup, operations and maintenance – GDPR-compliant from Germany.

Managed Proxmox →

Frequently Asked Questions

Answers to the most important questions

Yes. Proxmox VE is licensed under the AGPLv3 and is completely free to use, with no licensing fees and no limit on CPUs, cores or VMs. An optional enterprise subscription provides access to the more stable enterprise repository and vendor support. It is not required to run Proxmox, but recommended in enterprise environments.

Proxmox VE is open source with no per-core licensing costs, while VMware vSphere is proprietary and, since the Broadcom acquisition, moved to core-based subscriptions. Technically Proxmox uses KVM and LXC, VMware uses the ESXi hypervisor. For many companies Proxmox is the economical and sovereign alternative without vendor lock-in.

A VM (via KVM) virtualizes complete hardware and can run any operating system, including Windows. An LXC container shares the host kernel and is therefore more lightweight and resource-efficient, but only runs Linux. Proxmox manages both in the same interface.

No. Proxmox runs on standard x86-64 hardware. For clusters and high availability, multiple nodes with similar specs plus shared or replicated storage (e.g. ZFS or Ceph) are recommended. Dedicated servers from providers such as Hetzner work well too.

Yes. Proxmox VE ships with a built-in import wizard for VMware VMs. Existing virtual machines can be taken over, often with manageable effort. We regularly support such migrations and handle planning, the move and ongoing operations.