What Is a VPS? A Plain-English Answer
A VPS is one physical server sliced by a hypervisor into private machines, usually with their own kernel and root login. What that gets you, and where it stops.
Virtualization
Virtual machines on a VPS. Nested virtualization, when your provider allows it, and how to tell whether the CPU flags you need are actually there.
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VDS vs VPS: is there a difference?
VDS and VPS usually mean the same thing. Learn where the terms came from, and run four commands that show whether you bought a KVM machine or a container.
VPS nested virtualization: can you run Proxmox?
Most VPS hosts hide the vmx flag. Check yours with kvm-ok in one minute, then run KVM or Proxmox guests, with the exact error strings you will see.
Enable nested virtualization in Proxmox VE 9
Nested virtualization in Proxmox VE 9: check kvm_intel or kvm_amd, set nested=1 in modprobe.d, give the VM a host CPU, verify in the guest, or turn it off.
KVM vs Xen vs LXC: what your VPS runs
KVM, Xen and LXC decide whether your VPS has its own kernel, real swap, working nested virtualisation and honest steal time. Find out which one you bought.
Can your VPS run Firecracker microVMs?
Firecracker needs /dev/kvm, and most VPS plans never pass it through. Check yours in three commands, read the result, and know what to run when it is missing.