Kairos
Kairos: An open-source immutable OS for teams running Kubernetes-focused edge and cloud fleets. Ranked #20 of 29 in Server Operating System by our editors (7.8/10); pricing: Free plan; best for immutable Kubernetes edge clusters.
At a glance
- Editor score7.8 / 10
- PricingFree plan
- Best forImmutable Kubernetes edge clusters
- Free planYes
- Paid fromFree
- License modelOpen_source
- Facts checked24 Sep 2026
Where it wins
- Builds images from upstream Linux distributions
- Automates installation, reset, and upgrade operations
- Integrates with k3s, k0s, kubeadm, and RKE2
Where it doesn't
- Focused on Kubernetes and edge deployments
- Requires configuration-file driven operational workflows
- Commercial support is separate from the open-source project
Our verdict on Kairos
Kairos is an open-source, immutable Linux operating system and meta-distribution for edge and cloud-native deployments. It is designed for teams building and operating fleets of edge devices or Kubernetes nodes, including small organizations and larger enterprise environments. Kairos supports multi-architecture deployments and can run in cloud or self-hosted settings. Its immutable model centers on controlled installation, reset, upgrade, and node-management operations rather than general-purpose server administration.
The project is available as a free, open-source operating system. Teams can build OS images from upstream Linux distributions and create ISO, cloud-image, and netboot artifacts with the Kairos Operator. Automated installation uses configuration files, while the installation WebUI accepts YAML input and provides syntax checking during live installation. This combination suits repeatable provisioning across device fleets. Commercial support is offered separately by Spectro Cloud, while Kairos itself does not require a paid operating-system plan.
Kubernetes compatibility is a central strength: integrations include k3s, k0s, kubeadm, and RKE2. Optional peer-to-peer networking supports self-coordinated edge clusters, adding a path for distributed nodes that need local coordination. The trade-off is focus. Organizations wanting a conventional Linux server with broad, non-Kubernetes administration features may prefer a more general distribution. Kairos is a strong fit when immutable nodes, repeatable image creation, and Kubernetes-oriented lifecycle management are priorities; it is less suitable when the primary requirement is a broadly configurable standalone server operating system.
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Kairos pricing
Kairos fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| License model | Open_source |
| Architecture support | Multi_arch |
| Management interface | Both |
| Long-term support | Not verified |
| Live kernel patching | Not verified |
| Container tooling | Yes |
| Commercial support | Yes |
| Deployment | Cloud, Self-hosted |
| Platforms | Linux, Web |
| Support | Community · 24/7 |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 4 integrations: k3s, k0s, kubeadm, RKE2 |
| Pricing | Free plan |
| Website | kairos.io |
| Facts checked | 24 Sep 2026 |
Kairos integrations
Kairos lists 4 integrations on its own site.
- k3s
- k0s
- kubeadm
- RKE2
Alternatives to Kairos
- Ubuntu ServerFree, multi-architecture Linux with five years of LTS maintenance and optional Pro services.9.4
- DebianA stable, broadly compatible server OS with APT, security updates and cloud images.9.3
- AlmaLinux OSA free RHEL-compatible Linux distribution for servers, cloud, containers and more.9.2
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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