Cilium
Container networking software
DevOps software
Containerization software
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What is Cilium
Cilium is an open-source container networking, security, and observability platform for Kubernetes and other Linux-based environments. It uses eBPF in the Linux kernel to implement networking and enforce network policies, and it can provide service load balancing and visibility into network flows. It is typically used by platform engineering and DevOps teams operating Kubernetes clusters that need fine-grained network controls and runtime-level telemetry.
eBPF-based datapath performance
Cilium implements much of its networking and policy enforcement using eBPF programs in the Linux kernel. This design can reduce reliance on iptables-based rules and can improve scalability for high-churn container environments. It also enables deeper packet and flow visibility than many overlay-only CNIs because enforcement and telemetry occur close to the datapath.
Integrated network security controls
Cilium supports Kubernetes NetworkPolicy and also provides its own policy model for L3/L4 and (optionally) L7-aware controls. Policies can be expressed using Kubernetes identities (labels) rather than static IPs, which fits dynamic container scheduling. This helps teams standardize segmentation and zero-trust-style controls without deploying a separate network-policy engine.
Observability and troubleshooting tooling
Cilium includes built-in observability components (for example, flow visibility and service dependency mapping) that help operators troubleshoot connectivity and policy issues. This reduces the need to stitch together multiple tools for basic network-flow inspection in Kubernetes. The telemetry is closely tied to the enforcement point, which can make policy debugging more actionable.
Operational complexity and learning curve
Operating an eBPF-based CNI requires familiarity with kernel-level concepts, Cilium-specific components, and Kubernetes networking internals. Upgrades and configuration choices (for example, kube-proxy replacement, tunneling vs. native routing, and policy modes) can add operational overhead. Teams without strong platform engineering skills may find it harder to adopt than simpler CNIs.
Kernel and platform dependencies
Cilium’s feature set depends on Linux kernel capabilities and distribution-specific packaging, which can constrain older kernels or certain managed environments. Some advanced features may require newer kernels or specific settings, creating variability across node pools. This can complicate standardization across heterogeneous infrastructure.
Not a full DevOps suite
While Cilium supports networking, security, and observability, it does not replace broader CI/CD, GitOps, or application delivery tooling. Organizations often still need separate products for ingress management, service mesh features, or pipeline orchestration depending on requirements. This can lead to additional integration work in end-to-end platform stacks.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Cilium (Open Source) | Free (open-source) | eBPF-based CNI: networking, security, observability (Hubble). Maintained by the Cilium project; OSS distribution and docs available on the official site. |
| Isovalent Cilium (Commercial / Enterprise) | Custom pricing — contact sales | Commercial enterprise edition with support SLAs, enterprise features (extended observability, runtime security via Tetragon, platform integrations). No public, fixed pricing published on Isovalent's official site; customers are directed to contact Isovalent for purchase. |
Seller details
Isovalent
Mountain View, California, United States
2017
Private
https://www.isovalent.com/
https://x.com/isovalent
https://www.linkedin.com/company/isovalent
