“VPS” gets slapped on very different products. The single biggest thing to check before you buy a cheap one is whether it’s KVM — and here’s why that matters.
A VPS (Virtual Private Server) is a slice of a physical server that behaves like its own machine: its own operating system, its own storage, its own root login. But how that slice is created changes what you can actually do with it.
KVM (Kernel-based Virtual Machine) is full hardware virtualization. Your VPS gets its own virtual hardware and its own kernel, just like a dedicated server in miniature. The host can't peek into your processes, and you can do low-level things a shared environment won't allow:
Container-based "VPS" share the host's kernel. They're cheaper for the provider to pack densely, which is why some rock-bottom offers are containers. The trade-offs: you usually can't change the kernel, swap and some modules may be unavailable, Docker can be fiddly, and "RAM" is sometimes oversold and burstable. For a lot of simple use cases that's fine — but you should know which one you're buying.
Running Docker or Kubernetes? Want to install a VPN, a custom kernel, or a mail stack? Need predictable performance for a game server or a database? Those all want KVM. Container VPS can do basic web hosting and lightweight bots, but they hit walls quickly.
Every VPS at overnight.host is KVM, running on dedicated single-tenant bare metal (dual E5-2697 v2, 128 GB ECC RAM per node) with SSD storage and 10 Gbps uplinks. You get full root, your own kernel, and reinstall/reboot from the panel. One honest caveat we put up front: VPS currently use shared IPv4 (NAT) with a dedicated SSH port — see NAT IPv4 vs a dedicated IP for what that does and doesn't affect.
For flexibility, yes — KVM gives you your own kernel, real dedicated RAM, Docker, swap and the ability to run any OS. Containers (OpenVZ/LXC) are cheaper to oversell but more limited. Pick based on your workload.
Yes. Full virtualization means Docker, nested containers and custom kernel features work normally.
Yes — a KVM VPS gives you complete root access and your own kernel.
KVM on single-tenant bare metal. No container repackaging.
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KVM Ubuntu LTS from €4.99/mo.
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