Softwr

Cloud · head to head

Cilium vs Zabbix

Cilium logo

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From
Free
Rated
-
Full reviewWebsite
Zabbix logo

Zabbix

Networking

Open source infrastructure and network monitoring with distributed proxies and templating

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Cilium requires a recent Linux kernel, which rules out older distributions and some managed environments; Zabbix the database is the scaling limit, and high frequency polling grows history tables fast enough that untuned installations hit housekeeping stalls and query timeouts within months.
  • They diverge on capability: Cilium covers eBPF datapath, Zabbix covers Agent and agentless collection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Cilium and Zabbix actually diverge.

Attributes where Cilium and Zabbix differ
AttributeCiliumZabbix
PlatformsKubernetes, LinuxLinux, Docker, Kubernetes, Web
CategoryCloudNetworking

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).

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 Zabbix

  • Agent and agentless collection
  • Templates
  • Low-level discovery
  • Distributed proxies
  • Trigger expressions
  • Escalation actions

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 Zabbix
  • Network policy expressed on workload identity rather than fragile IP rulesnot Zabbix
  • Seeing which services actually talk to each other, and what policy is droppingnot Zabbix

Zabbix

  • A service provider monitoring thousands of customer devices where per-device commercial licensing is the largest line itemnot Cilium
  • Branch or industrial sites with unreliable links that need local collection and bufferingnot Cilium
  • Mixed estates where the same tool must poll SNMP switches, Linux hosts, Windows servers and Java applicationsnot Cilium
  • Replacing an aging Nagios installation while keeping script-based checks that already existnot 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

Zabbix

  • The database is the scaling limit, and high frequency polling grows history tables fast enough that untuned installations hit housekeeping stalls and query timeouts within months.
  • Initial configuration is heavy; getting useful alerting rather than noise requires understanding trigger expressions, macros and template inheritance, which is a multi-week learning curve for a team new to it.
  • The AGPLv3 change at version 7.0 affects anyone offering Zabbix over a network as part of a commercial service, and that obligation is easy to inherit accidentally during an upgrade.
  • The web interface is functional rather than pleasant, and many sites end up running Grafana alongside it purely for presentation, which is a second system to maintain.
  • Upgrades between major versions touch the database schema and can take hours on large history tables, so the maintenance window is proportional to how much data you kept.

Pricing, plan by plan

Cilium

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

Zabbix

Free
  • ZabbixFree
    • No device, node or metric limits
    • Full feature set with no paid edition of the software
    • AGPLv3 from version 7.0 onward
  • Zabbix Technical Support$undefined/year
    • Tiered subscriptions with defined response times
    • Access to Zabbix engineers for configuration and performance issues
    • Bug fix priority and backports

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 Zabbix if

  • You need agent and agentless collection.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Web.
  • You also want templates.
Zabbix review

Questions people ask

Is Cilium or Zabbix better?
Neither clearly leads. Cilium starts at Free and Zabbix at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or Zabbix?
Cilium starts at Free and Zabbix at Free.
Does Cilium or Zabbix run on more platforms?
Cilium runs on Kubernetes, Linux. Zabbix runs on Linux, Docker, Kubernetes, Web.
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 Zabbix is typically brought in for.
What can Cilium do that Zabbix cannot?
Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Zabbix covers Agent and agentless collection, Templates, Low-level discovery, Distributed proxies.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

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

Zabbix: Is Zabbix genuinely free for commercial use?

The software has no licence fee at any scale. From version 7.0 it is AGPLv3, so offering it as a network service to third parties carries source distribution obligations.

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.

Zabbix: What is the real cost of running it?

Database administration and the person who tunes it. Budget for PostgreSQL with TimescaleDB and someone who owns the retention policy.

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.

Zabbix: How does it compare to a commercial per-device tool?

It removes the licence line entirely and adds an operations line. Below a few hundred devices the commercial tool is often cheaper in total; above that Zabbix wins clearly.

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