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The official OpenVZ wiki defines OpenVZ as container-based virtualization for Linux; containers share the host kernel.
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Compare KVM, OpenVZ/LXC containers, VMware and Hyper-V by kernel, isolation, Windows support, nested virtualization and resource control.
The official OpenVZ wiki defines OpenVZ as container-based virtualization for Linux; containers share the host kernel.
KVM provides full virtual machines through Linux kernel virtualization; guests can run their own kernel and OS image.
OpenVZ and LXC containers share the host Linux kernel. Isolation is provided by namespaces, cgroups and related kernel mechanisms. This is efficient, but the guest does not boot an independent kernel.
KVM, VMware ESXi and Hyper-V expose virtual hardware to full VMs, allowing Windows and different Linux kernels to run more independently.
KVM uses Linux kernel virtualization and is commonly managed with QEMU/libvirt. Providers can expose virtual CPU topology, memory, disks and network devices to guests.
For Windows guests, custom ISOs, independent kernels, nested virtualization or specific kernel modules, a full-VM model is generally more suitable.
Container virtualization can provide low overhead and high density. It can be efficient for Linux services and lightweight instances. The tradeoff is less kernel independence than a full VM.
Docker and nested-container needs can be constrained by provider cgroup/kernel policy. Root access does not always mean every kernel feature is available in a container VPS.
VMware ESXi is a mature full-VM hypervisor ecosystem; Hyper-V integrates strongly with Windows Server and Microsoft tooling. For customers, the hypervisor name alone matters less than provider CPU, storage, HA and overcommit policies.
If you plan to run Proxmox, KVM inside a VM, Android emulators, WSL2/Hyper-V or another nested hypervisor, a KVM label is not enough. Confirm nested VT-x/AMD-V exposure with the provider.
On Linux, `systemd-detect-virt` can identify virtualization, although nesting and masking can affect results.
systemd-detect-virtlscpu | grep -E 'Hypervisor|Virtualization|Model name'grep -E 'vmx|svm' /proc/cpuinfo | headCPU sharing, memory ballooning/swap, storage backend and IOPS, snapshot/backup behavior, network and DDoS design often matter more. A poorly managed KVM host can be slow; a well-managed container host can be excellent for the right workload.
| Technology | Type | Guest kernel | Windows guest | Typical strength |
|---|---|---|---|---|
| KVM | Full VM | Independent | Yes | Flexibility / custom OS |
| OpenVZ/LXC | Container | Shared with host | No / Linux-focused | Low overhead |
| VMware ESXi | Full VM | Independent | Yes | Enterprise VM ecosystem |
| Hyper-V | Full VM | Independent | Yes | Microsoft integration |
Do not buy based on one benchmark, port label or CPU brand. Repeat tests at different times, avoid destructive storage tests on production data, and verify provider resource/fair-use policies in writing.
No. KVM describes virtualization type; CPU sharing or pinning is a separate provider policy.
Classic OpenVZ containers share a Linux kernel; Windows guests require a full-VM approach.
Share your software stack, concurrency, storage/database load and target region; size the server around the real bottleneck rather than RAM/core labels alone.