Proxmox VE
| License | FOSS problems | Maintenance | SSO | Users | Tested |
|---|---|---|---|---|---|
| AGPLv3Copyleft license. If you modify it and run it as a service, you must publish your changes. Surrounding linked code must also be open. | Single-vendor governed, paid subscription for the enterprise repo and support | Active | — | Unlimited | ❌ |
Description
Proxmox VE is an open-source virtualization platform — KVM for full VMs, LXC for containers — that's grown cloud-management features (clustering, a web UI, API-driven automation) on top. Closer to a VMware vSphere replacement than a multi-tenant IaaS platform like OpenStack or CloudStack: built for operating your own virtualization infrastructure, not for building a product to sell capacity on top of.
Features
- KVM and LXC — full virtual machines and lightweight containers under one platform, not just one or the other.
- Clustering and web UI — multi-node management and API-driven automation, grown on top of what started as a single-node virtualization tool.
- Enterprise repository and support — an optional paid subscription (billed per CPU socket per year) unlocks the enterprise update repository and vendor support with an SLA — not a license fee, since the software itself is fully usable and licensed for commercial use without paying anything.
Usage patterns
- VMware replacement — its main growth driver recently: enterprises fleeing vSphere licensing changes after Broadcom's 2023 acquisition, replacing their own internal virtualization infrastructure rather than building a multi-tenant cloud product.
- Not built for large-scale multi-tenant public cloud — lacks the purpose-built multi-tenancy, quota/project isolation, and massive-scale orchestration OpenStack and CloudStack are actually designed around. Growing upmarket (multi-cluster management), but still generally regarded as a different tier of tool for that specific use case.
License and governance
AGPLv3 — free and open source, fully usable commercially without paying anything; the paid subscription is for support and the enterprise repository, not the software license itself. Single-vendor governed: published by Proxmox Server Solutions GmbH (Vienna, Austria), not a foundation — the same single-company-behind-an-AGPL-project shape as Nextcloud and CiviCRM, though without those two's CLA requirement on contributions.
Conclusion
Why you would — a real, actively-growing open alternative to VMware for operating your own virtualization infrastructure, fully free and open source, with an optional paid tier for support and the enterprise repo rather than a license fee.
Why you wouldn't — it's not the same category of tool as OpenStack or CloudStack despite sitting in this same catalog section: built for operating virtualization infrastructure, not for the purpose-built multi-tenancy and scale those two are actually designed around. The right comparison is against VMware, not against a multi-tenant cloud platform.