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Docs / LXC Containers / LXC Container Limitations vs KVM

LXC Container Limitations vs KVM

LXC containers are a genuinely useful second backend, but they're deliberately narrower than KVM in a few ways - worth knowing before you pick a virtualization type for a given workload:

  • No console/VNC access - a container has no virtual hardware to display, so there's no graphical console the way a KVM guest has. SSH is the only way in once networking is up.
  • No backups or cloning yet - the automated backup system and "clone a VPS" feature are currently KVM-only.
  • No extra volumes or PCI/GPU passthrough - both of those attach virtual/physical hardware to a VM in a way that doesn't have a container equivalent yet.
  • No "Create Template from VPS" - turning a running guest into a reusable template currently only works for KVM's disk-image-based guests.
  • Linux only - a container shares the host's kernel, so Windows (or any non-Linux OS) isn't possible under LXC. Use KVM for Windows guests.

None of these are permanent architectural limits - they're just not built yet. The panel is explicit about each one wherever it applies (e.g. the Console tab explains why it's unavailable for a container VPS, rather than just failing silently), so it should never be a surprise when one of these doesn't work for an LXC guest.