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Proxmox & virtualizationUpdated: 02/11/2026

Proxmox on Netcup: LXC, KVM and the SVM limit

Proxmox VE runs on Netcup root servers, but not every virtualization type is available by default. This guide separates LXC from KVM and shows the checks.

1. What works and what does not

Netcup root servers are themselves virtualized. Docker and LXC containers run normally. Proxmox VE can manage LXC. For real KVM VMs, Proxmox needs the SVM/VT-x flag; Netcup does not enable it by default and it must be confirmed with support before ordering.

  • LXC: normally possible; containers share the kernel.
  • KVM: only with SVM/VT-x enabled, not guaranteed.
  • Docker: runs independently of Proxmox.
  • Always check CPU flags first.

2. Check CPU flags

Before installing, check whether the hypervisor exposes virtualization flags. Without vmx/svm you cannot start KVM VMs; LXC remains possible.

egrep -c '(vmx|svm)' /proc/cpuinfo
# 0 = no KVM support visible
# >0 = flags visible, but support approval still required

Note: Even if flags are visible, Netcup may restrict usage. Confirm approval with support in writing.

3. Install Proxmox VE

Install Debian 12 minimal and add the Proxmox repository. For LXC you need templates; for KVM you additionally need SVM approval. The network bridge must carry the Netcup IP and gateway correctly.

# On Debian 12 (simplified)
echo "deb [signed-by=/usr/share/keyrings/proxmox-release-bookworm.gpg] http://download.proxmox.com/debian/pve bookworm pve-no-subscription" > /etc/apt/sources.list.d/pve.list
apt update && apt install proxmox-ve postfix open-iscsi
pveam update

Note: The exact repository and bridge configuration is in the official Proxmox docs. Wrong network settings can make the server unreachable.

4. LXC instead of KVM

If KVM is not enabled, LXC containers remain: lightweight, fast and sufficient for many services. For isolated kernels, Windows or nested hypervisors you need KVM and therefore support approval.

Official sources

Server FAQOfficial virtualization notes.Network configurationIP, gateway and bridge.Rescue systemAccess after network errors.Proxmox docsOfficial documentation.

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Frequently asked questions

Can I run KVM VMs in Proxmox on Netcup?

Not by default. The SVM/VT-x flag must be enabled by Netcup support. It is not guaranteed, may be chargeable, and should be clarified before ordering.

Source
Do LXC containers work without approval?

Yes. LXC shares the host kernel and does not need SVM passthrough. Docker also runs normally.

Why are CPU flags visible but KVM does not start?

Visible flags do not automatically mean approval. Netcup may restrict usage; confirm the terms with support and check the current notes.

Source