Is Cilium or Docker better?

Neither clearly leads. Cilium starts at Free and Docker at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Cilium or Docker?

Cilium starts at Free and Docker at Free.

Does Cilium or Docker run on more platforms?

Cilium runs on Kubernetes, Linux. Docker runs on Linux, macOS, Windows.

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 Docker is typically brought in for.

What can Cilium do that Docker cannot?

Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Docker covers Container runtime, Docker Desktop, Docker Hub, Docker Compose.

Cloud · head to head

Cilium vs Docker

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From: Free
Rated: -

Full review Website

Docker

Technology

Accelerate how you build, share, and run applications

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: Cilium requires a recent Linux kernel, which rules out older distributions and some managed environments; Docker shared kernel creates security vulnerabilities when containers share the same OS kernel that can bypass container isolation
They diverge on capability: Cilium covers eBPF datapath, Docker covers Container runtime.

Where they differ

Only the attributes on which Cilium and Docker actually diverge.

Attributes where Cilium and Docker differ
Attribute	Cilium	Docker
Pricing model	Open source, no licence fee	Unknown
Platforms	Kubernetes, Linux	Linux, macOS, Windows
Category	Cloud	Technology
Founded	Unknown	2010

Identical on both: starting price (Free), 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 Docker

Container runtime
Docker Desktop
Docker Hub
Docker Compose
Container images
Dockerfile
Docker Swarm
BuildKit

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

Docker

Application containerizationnot Cilium
Microservicesnot Cilium
CI/CD pipelinesnot Cilium
Development environmentsnot Cilium
Cloud migrationnot 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

Docker

Shared kernel creates security vulnerabilities when containers share the same OS kernel that can bypass container isolation
Daemon socket exposure grants full root access to the host if compromised
Requires careful secrets management - credentials embedded in images or environment variables are easily harvested by attackers
Resource management complexity - misbehaving or compromised containers can consume all resources causing denial of service
Orchestration complexity - Docker Swarm is less capable than Kubernetes, requiring external tools for production deployments

Pricing, plan by plan

Cilium

Free

CiliumFree
- Full functionality
- No usage limits
- Community support

Docker

Free

No published plan breakdown. See the Docker review.

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 Docker if

You need container runtime.
You want to start without paying.
You work on Linux, macOS, Windows.
You also want docker desktop.

Docker review

Questions people ask

Is Cilium or Docker better?: Neither clearly leads. Cilium starts at Free and Docker at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or Docker?: Cilium starts at Free and Docker at Free.
Does Cilium or Docker run on more platforms?: Cilium runs on Kubernetes, Linux. Docker runs on Linux, macOS, Windows.
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 Docker is typically brought in for.
What can Cilium do that Docker cannot?: Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Docker covers Container runtime, Docker Desktop, Docker Hub, Docker Compose.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

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

Docker: What is Docker pricing?

Docker offers a freemium model with Docker Personal free, Docker Pro at $11/user/month, Docker Team at $16/user/month, and Docker Business at $24/user/month. Each tier includes Docker Desktop, Docker Hub, and Docker Scout with different usage limits.

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.

Docker: Can I use Docker in production?

Yes. Docker is used extensively in production environments. However, for container orchestration at scale, Kubernetes is typically paired with Docker to automate deployment, scaling, and management across clusters.

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.

Docker: What are the main security concerns with Docker?

Key security risks include container breakout vulnerabilities through shared kernel exploits, daemon socket exposure that grants root access if compromised, weak isolation between containers, and credential leakage if secrets are embedded in images.

Source

Docker: Does Docker integrate with CI/CD systems?

Yes. Docker integrates with Jenkins, GitHub, and other CI/CD systems. The typical workflow involves GitHub repositories triggering automated builds in Jenkins, which prepare Dockerfiles and push images to Docker Hub for deployment.

Source

Cilium vs Docker

Cilium

Docker

The short version

Where they differ

What each one covers

Only in Cilium

Only in Docker

What people use each for

Cilium

Docker

Where each one falls short

Cilium

Docker

Pricing, plan by plan

Cilium

Docker

Which should you pick?

Choose Cilium if

Choose Docker if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Cilium

More on Docker

Keep looking

Other head to heads