When browsing VPS providers, two terms dominate: KVM and OpenVZ. The difference dictates how your server behaves, what OS you can run, and resource isolation.
OpenVZ: OS-Level Containerization
OpenVZ is not true virtualization. All VPS instances share the same Linux kernel. OpenVZ servers are cheap because providers can aggressively oversell resources.
The Risks of OpenVZ
You cannot install custom kernel modules like WireGuard or BBR. If a neighboring container causes a kernel panic, your VPS crashes too.
KVM: Full Hardware Virtualization
KVM transforms the Linux kernel into a Type-1 hypervisor. Your VPS has its own independent kernel. You can run Windows, FreeBSD, or any OS. Resources are strictly enforced.
Recommended KVM Providers
All top providers on our comparison page use KVM virtualization. 3V-Host and RockHoster offer full KVM with dedicated resources.
Frequently Asked Questions
Which should I choose?
If you need anything beyond basic PHP hosting, choose KVM. Real engineering requires KVM.
Can Docker run on OpenVZ?
It is extremely difficult. On KVM, Docker runs flawlessly.
Conclusion
The industry has rapidly shifted towards KVM. While OpenVZ remains budget-friendly, KVM is the undeniable standard for professional infrastructure.
