K3s
What it is
K3s is a certified, lightweight Kubernetes distribution designed for IoT and edge computing. It is self-hosted and distributed as a single binary or minimal container image. The site describes the binary as under 70 MB, while documentation says under 100 MB. SQLite is the default datastore, with etcd, MySQL, and Postgres also available. K3s packages components including containerd or cri-dockerd, Flannel, CoreDNS, Traefik, ServiceLB, Kube-router, local-path-provisioner, and Spegel. Documented uses include edge deployments, homelabs, IoT, continuous integration, development, ARM single-board computers, air-gapped environments, and embedded Kubernetes. High availability can use an embedded datastore or an external MySQL, PostgreSQL, or etcd datastore. Air-gapped installation guidance covers private registries, manually deployed images, and an embedded registry mirror. Security documentation provides hardening guidance and CIS benchmark self-assessment guides. Releases are listed for x86_64, ARMv7, and ARM64. K3s is free, with no usage limits stated on the referenced pages.
For and against
For
- Free self-hosted distribution
- Single binary or minimal image
- Multiple datastore choices
- High-availability configurations
- Air-gapped installation options
Against
- No native Windows support
- Self-hosted deployment required
- Documentation gives differing binary-size figures
- Requires Kubernetes operational knowledge
The verdict
K3s packages core Kubernetes components into a compact distribution with broad edge and constrained-environment use cases. Its architecture, datastore choices, and air-gapped guidance support varied deployments, while Windows users need another platform.
Who it suits
K3s suits teams and individuals deploying self-hosted Kubernetes for edge, IoT, homelab, development, ARM, or air-gapped environments.
Plans and prices
K3s
No price or usage limits stated on the opened official pages
Read 7 Oct 2026 · k3s.io
On the record
- Air-gapped installs
- The installation guide documents air-gapped setups using a private registry, manually deployed images, or the embedded registry mirror.docs.k3s.io · read 7 Oct 2026
- Community support
- The FAQ directs users to known issues, GitHub issues and discussions, and the K3s channel in Rancher Slack for help.docs.k3s.io · read 7 Oct 2026
- Datastores
- SQLite is the default lightweight datastore, and etcd, MySQL, and Postgres are also available.docs.k3s.io · read 7 Oct 2026
- Footprint
- The site describes K3s as a single binary under 70 MB, while the documentation says under 100 MB.k3s.io · read 7 Oct 2026
- High availability
- K3s supports high-availability setups with an embedded datastore or external MySQL, PostgreSQL, or etcd datastore.docs.k3s.io · read 7 Oct 2026
- Included components
- K3s packages containerd or cri-dockerd, Flannel, CoreDNS, Traefik, ServiceLB, Kube-router, local-path-provisioner, and Spegel.docs.k3s.io · read 7 Oct 2026
- Integrations
- The upgrade documentation describes Kubernetes-native automated upgrades using Rancher's system-upgrade-controller.docs.k3s.io · read 7 Oct 2026
- Packaging
- K3s is distributed as a single binary or minimal container image.docs.k3s.io · read 7 Oct 2026
- Product
- K3s is a certified, lightweight Kubernetes distribution designed for IoT and edge computing.k3s.io · read 7 Oct 2026
- Security
- The security documentation provides hardening guidance and CIS benchmark self-assessment guides, which assume K3s runs with embedded etcd.docs.k3s.io · read 7 Oct 2026
- Supported architectures
- The site lists x86_64, ARMv7, and ARM64 releases.k3s.io · read 7 Oct 2026
- Use cases
- The documentation lists edge, homelab, IoT, continuous integration, development, ARM single-board computers, air-gapped environments, and embedded Kubernetes as use cases.docs.k3s.io · read 7 Oct 2026
- Windows support
- The FAQ states K3s does not natively support Windows.docs.k3s.io · read 7 Oct 2026
