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Cloud · head to head

Cilium vs Proxmox VE

Cilium logo

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From
Free
Rated
-
Full reviewWebsite
Proxmox VE logo

Proxmox VE

Cloud

Open-source hypervisor combining KVM and LXC virtualisation

From
€120/year
Rated
-
Full reviewWebsite

The short version

  • Only Cilium has a free tier, so it costs nothing to try first.
  • Each has a real cost: Cilium requires a recent Linux kernel, which rules out older distributions and some managed environments; Proxmox VE per-socket licensing model: cost scales with CPU socket count, not vCore count, resulting in high costs for multi-socket servers
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Cilium and Proxmox VE actually diverge.

Attributes where Cilium and Proxmox VE differ
AttributeCiliumProxmox VE
Starting priceFree€120/year
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsKubernetes, LinuxLinux, Web, API, Self-hosted

Identical on both: user rating (Not yet rated), category (Cloud).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Cilium

  • eBPF datapath
  • Identity-based policy
  • Hubble observability
  • Sidecar-free mesh

Only in Proxmox VE

Nothing recorded that Cilium does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

Cilium

  • Kubernetes networking at a scale where iptables-based CNI performance degradesnot Proxmox VE
  • Network policy expressed on workload identity rather than fragile IP rulesnot Proxmox VE
  • Seeing which services actually talk to each other, and what policy is droppingnot Proxmox VE

Proxmox VE

  • Open-source datacenter virtualisation for hosting providers and cloud platformsnot Cilium
  • Cost-sensitive enterprise virtualisation replacing commercial hypervisorsnot Cilium
  • High-availability clustering for disaster recovery and business continuitynot Cilium
  • Container deployments using LXC as lighter-weight alternative to Dockernot Cilium
  • Hybrid VM and container workloads in a single management interfacenot Cilium
  • Backup and archival infrastructure alongside primary virtualisationnot Cilium

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Cilium

  • Requires a recent Linux kernel, which rules out older distributions and some managed environments
  • eBPF is genuinely hard to debug when it misbehaves, and the skill is rare on most teams
  • Broad scope — CNI, policy, mesh, observability — means the learning curve covers several domains at once

Proxmox VE

  • Per-socket licensing model: cost scales with CPU socket count, not vCore count, resulting in high costs for multi-socket servers
  • Linux-based host only; Windows hypervisors not supported, limiting adoption in Windows-focused organisations
  • Clustering and high-availability setup requires operational expertise and careful network configuration
  • Commercial support tiers limit advanced features (just-in-time access, network flow logs) to paid subscriptions
  • Smaller ecosystem of third-party plugins and integrations compared to VMware vSphere

Pricing, plan by plan

Cilium

Free
  • CiliumFree
    • Full functionality
    • No usage limits
    • Community support

Proxmox VE

€120/year
  • Community$120/year
    • Enterprise Repository access
    • Community forum support only
    • Per-socket subscription model
  • Basic$370/year
    • 3 support tickets per year
    • 1 business day response time
    • Stable updates and Enterprise Repository
  • Standard$550/year
    • 10 support tickets per year
    • 4-hour response time for critical issues
    • Remote SSH support and offline updates
  • Premium$1100/year
    • Unlimited support tickets
    • 2-hour response time for critical issues
    • Remote SSH support and offline updates

Which should you pick?

Choose Cilium if

  • You need ebpf datapath.
  • You want to start without paying.
  • You work on Kubernetes, Linux.
  • You also want identity-based policy.
Cilium review

Choose Proxmox VE if

  • You work on Linux, Web, API, Self-hosted.
Proxmox VE review

Questions people ask

Is Cilium or Proxmox VE better?
Neither clearly leads. Cilium starts at Free and Proxmox VE at €120/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or Proxmox VE?
Cilium has a free tier; the other does not. Paid plans start at Free for Cilium and €120/year for Proxmox VE.
Does Cilium or Proxmox VE run on more platforms?
Cilium runs on Kubernetes, Linux. Proxmox VE runs on Linux, Web, API, Self-hosted.
Can I use Cilium for free?
Yes. Cilium has a free tier, so you can try it without paying. Proxmox VE starts at €120/year.
What is Cilium best used for?
Cilium is most often used for kubernetes networking at a scale where iptables-based cni performance degrades, network policy expressed on workload identity rather than fragile ip rules, seeing which services actually talk to each other, and what policy is dropping. Of those, kubernetes networking at a scale where iptables-based cni performance degrades and network policy expressed on workload identity rather than fragile ip rules are not what Proxmox VE is typically brought in for.
What can Cilium do that Proxmox VE cannot?
Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

Yes, open source and CNCF-graduated. Isovalent sells an enterprise distribution and support.

Proxmox VE: What is the licensing model for Proxmox VE?

Proxmox VE is open-source and free to deploy. Optional subscription tiers provide technical support, priority response times, and access to the Enterprise Repository for stable update channels. All tiers include identical virtualisation features.

Source
Cilium: What does eBPF change?

It lets Cilium run packet-processing programs inside the kernel instead of relying on iptables rule chains, which behave poorly as the number of services grows.

Proxmox VE: Can I run Proxmox VE without a support subscription?

Yes. Community Edition (€120/year per socket) provides Enterprise Repository access with community-based support through forums. The core Proxmox VE platform is fully functional without any subscription.

Source
Cilium: Does Cilium replace a service mesh?

It can cover much of what a mesh does without sidecars, though full mesh feature sets still favour Istio or Linkerd.

Proxmox VE: What hypervisors does Proxmox VE support?

Proxmox VE includes both KVM for full virtualisation and LXC for Linux containers. It does not support Xen or Hyper-V. Workloads on those platforms must be migrated or reimplemented.

Source
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