VPS 详情里的”虚拟化类型”决定了这台机的独立性和能干什么，买前看清。
KVM（主流首选）
完全虚拟化，有独立内核：能 DD 重装任意系统、跑 Docker / WireGuard、改内核参数，资源相对独立。建站、折腾、科学上网都推荐 KVM。
OpenVZ（OVZ）/ LXC
容器虚拟化，共享宿主内核：更轻、商家成本低、所以便宜。但限制多——不能改内核、有的服务跑不了（如某些内核模块）、内存常虚标、更容易被 超售。低价机常见。
怎么分辨
看商家标注；或登录后看能不能改内核、swapon 是否可用、/proc 是否受限。
建议
- 建站 / 要装 Docker、WG / 想 DD 系统 → KVM。
- 纯轻量自用、预算极低、能接受限制 → OVZ 也行（很多 NAT 小鸡 是 OVZ）。
挑机器趁退款期多测几次；想看在售机型去 库存监控。
The “virtualization type” listed in a VPS product description determines how independent the instance is and what it can do. Know this before you buy.
KVM (The Mainstream Choice)
Full virtualization with an independent kernel: you can reinstall any OS, run Docker / WireGuard, and tweak kernel parameters. Resources are relatively isolated. KVM is the recommended choice for web hosting, experimenting, and self-hosting.
OpenVZ (OVZ) / LXC
Container-based virtualization with a shared host kernel: lighter, cheaper for providers, and therefore cheaper for you. But it comes with limitations — you can’t modify the kernel, some services won’t run (e.g., certain kernel modules), RAM is often overstated, and overselling is more common. Frequently seen in budget plans.
How to Tell Which Type You Have
Check the provider’s product description; or once logged in, see if you can change kernel settings, whether swapon works, or whether /proc is restricted.
Recommendation
- Hosting a website / need Docker or WireGuard / want to reinstall the OS → KVM.
- Purely lightweight personal use, extremely tight budget, fine with limitations → OVZ works (many NAT VPS plans use OVZ).
Use the refund window to test thoroughly before committing. Visit the stock monitor to browse available plans.
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