cAdvisor vs Thanos
A side-by-side comparison of two self-hosted monitoring & status options — licensing, setup difficulty, resource needs, and what each one replaces.
cAdvisor
Container resource usage and performance analysis
VS
Thanos
Highly available Prometheus setup with long-term storage
| Feature | cAdvisor | Thanos |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 96 · Excellent | 94 · Excellent |
| Category | Monitoring & Status | Monitoring & Status |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | Go |
| Setup difficulty | Easy | Hard |
| Min. RAM | 64 MB | 1,024 MB |
| Deployment | docker, kubernetes, binary | docker, kubernetes, helm |
| GitHub stars | ★ 19,440 | ★ 14,214 |
| First released | 2014 | 2018 |
| Replaces | Datadog | Datadog, Grafana Cloud |
What are cAdvisor and Thanos?
cAdvisor
cAdvisor provides container users with an understanding of the resource usage and performance characteristics of their running containers. It exposes per-container CPU, memory, network, and filesystem metrics.
- Per-container resource metrics
- Live web UI
- Prometheus metrics export
- Auto-discovers containers
Thanos
Thanos extends Prometheus with global query view, unlimited retention, and high availability. It uses object storage to keep metrics cheaply for years while presenting a single query endpoint across many Prometheus instances.
- Global query view
- Unlimited metric retention
- Object storage backend
- Downsampling for fast queries
cAdvisor vs Thanos: key differences
Both projects are written in Go. CAdvisor is the lighter option, starting around 64 MB of RAM against 1,024 MB for Thanos. CAdvisor is the more established project (first released 2014), while Thanos arrived in 2018.
Why pick each one
Choose cAdvisor if…
- Zero configuration
- Lightweight
Watch out for
- Limited historical retention
- Best paired with Prometheus
Choose Thanos if…
- Scales Prometheus to massive deployments
- Cheap long-term storage
Watch out for
- Complex multi-component architecture
- Steep learning curve
Frequently asked questions
Is cAdvisor or Thanos better?
cAdvisor is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Thanos if its specific feature set fits your needs better.
Are cAdvisor and Thanos free and open-source?
Yes. cAdvisor is licensed under Apache-2.0 and Thanos under Apache-2.0. Both can be self-hosted at no software cost.
Can I run cAdvisor and Thanos with Docker?
cAdvisor: yes. Thanos: yes.
Which is lighter on resources, cAdvisor or Thanos?
cAdvisor has the smaller minimum footprint at 64 MB of RAM, compared to about 1,024 MB for Thanos. Real-world usage depends on library size, user count, and enabled features.