Cloud · head to head
Cilium vs Longhorn
Cilium
Cloud
eBPF-based networking, observability and security for Kubernetes
- From
- Free
- Rated
- -
Longhorn
Cloud
Open source distributed block storage for Kubernetes, incubating at the CNCF
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Cilium requires a recent Linux kernel, which rules out older distributions and some managed environments; Longhorn there is no vendor and no SLA, so a production incident at three in the morning is your own problem unless you buy SUSE Rancher Prime support separately.
- They diverge on capability: Cilium covers eBPF datapath, Longhorn covers Per-volume controllers.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Cilium and Longhorn actually diverge.
Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), 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 Longhorn
- Per-volume controllers
- Synchronous replication
- Snapshots and backups
- Volume expansion
- Disaster recovery volumes
- Web interface
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 Longhorn
- Network policy expressed on workload identity rather than fragile IP rulesnot Longhorn
- Seeing which services actually talk to each other, and what policy is droppingnot Longhorn
Longhorn
- An on-premises Kubernetes cluster with local disks and no SAN that needs replicated persistent volumesnot Cilium
- Edge sites where shipping a storage array is impractical and three nodes is the whole clusternot Cilium
- A K3s deployment where the storage layer must be light enough to run alongside the workloadsnot Cilium
- A team that wants snapshots and S3 backups of persistent volumes without paying per-node storage licencesnot 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
Longhorn
- There is no vendor and no SLA, so a production incident at three in the morning is your own problem unless you buy SUSE Rancher Prime support separately.
- Synchronous replication across nodes means write latency depends on the slowest replica and the network between nodes, which makes it a poor fit for latency-sensitive databases.
- Every replica is a full copy, so three-way replication consumes three times the raw capacity, unlike erasure-coded systems that are far more space efficient.
- It is designed for block storage on modest clusters and does not scale to the node counts or throughput that Ceph or a commercial array handles, so growth eventually forces a migration.
- Recovery from certain degraded states, such as a volume stuck detaching or replicas failing to rebuild, requires manual intervention and knowledge of Longhorn internals that is not widely held.
Pricing, plan by plan
Cilium
Free- CiliumFree
- Full functionality
- No usage limits
- Community support
Longhorn
Free- LonghornFree
- Apache 2.0 licensed, no licence fee
- Community support via GitHub and Slack only
- No vendor SLA or escalation path
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.
Choose Longhorn if
- You need per-volume controllers.
- You want to start without paying.
- You work on Linux, Kubernetes.
- You also want synchronous replication.
Questions people ask
- Is Cilium or Longhorn better?
- Neither clearly leads. Cilium starts at Free and Longhorn at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cilium or Longhorn?
- Cilium starts at Free and Longhorn at Free.
- Does Cilium or Longhorn run on more platforms?
- Cilium runs on Kubernetes, Linux. Longhorn runs on Linux, Kubernetes.
- Can I use Cilium for free?
- Both have a free tier, so you can try either at no cost before committing.
- 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 Longhorn is typically brought in for.
- What can Cilium do that Longhorn cannot?
- Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Longhorn covers Per-volume controllers, Synchronous replication, Snapshots and backups, Volume expansion.
Answered from the vendors’ own pages
Cilium: Is Cilium free?
Yes, open source and CNCF-graduated. Isovalent sells an enterprise distribution and support.
Longhorn: Who do we call when it breaks?
Nobody, unless you buy SUSE Rancher Prime, which includes commercial support for Longhorn. This is the decisive question for production use.
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.
Longhorn: How much capacity does replication cost?
Full copies, so three replicas means three times the raw capacity. Budget accordingly rather than assuming erasure coding efficiency.
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.
Longhorn: Is it suitable for production databases?
For modest workloads yes, but synchronous replication adds write latency and high-transaction databases usually want something faster.
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