k3s: SUSE's Lightweight Kubernetes Distribution Gains Ground for Small Clusters

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k3s, developed by SUSE under the Rancher project, is a fully CVE-compliant Kubernetes distribution packaged as a single binary of roughly 100 MB. Unlike standard Kubernetes, which requires multiple binaries and at least three server nodes for redundant etcd operation, k3s replaces etcd with SQLite by default and bundles Flannel as its CNI and a local-path-provisioner for storage. The distribution was originally designed for IoT, edge computing, and CI/CD pipelines, but has since proven viable for small-to-medium production environments. Installation requires only a single curl command, after which k3s automatically configures systemd services and makes the cluster immediately operational. The trade-off involves reduced granular control compared to vanilla Kubernetes, though proponents argue that overhead is rarely justified for startups or small DevOps teams.

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