Flux
Continuous delivery for Kubernetes
The Lens
Push a commit, cluster updates itself. Flux is a GitOps tool that makes Git the source of truth for your infrastructure. It watches your Git repos and container registries, detects changes, and reconciles your cluster to match. No CI/CD pipeline needed for deployments. Git IS the pipeline.
Fully free under Apache 2.0. CNCF graduated project. You get Git repository syncing, Kustomize and Helm support, image update automation, multi-tenancy, and notifications (Slack, Teams, webhooks). It runs as a set of controllers inside your Kubernetes cluster.
The catch: Flux is Kubernetes-only. If you're not on Kubernetes, this isn't for you. The learning curve assumes you already understand Kubernetes concepts (CRDs, controllers, namespaces, RBAC). Debugging reconciliation failures requires understanding both Flux's logic AND Kubernetes internals. And compared to Argo CD (the other major GitOps tool), Flux has no built-in UI; you either use the CLI or third-party dashboards like Weave GitOps.
Free vs Self-Hosted vs Paid
fully freeFully open source under Apache 2.0. CNCF graduated. No paid tier from the Flux project itself.
**Commercial offerings:** Weaveworks (Flux's original corporate sponsor) went bankrupt in 2024. ControlPlane and others now provide commercial support. Weave GitOps (the dashboard) has both free and enterprise versions.
**Self-hosting costs:** Flux controllers consume minimal resources: 256MB-1GB RAM total. The cost is your Kubernetes cluster itself, not Flux.
**Comparison:** Argo CD (also CNCF, also free) includes a web UI out of the box. If you want a visual dashboard for GitOps, Argo CD is more turnkey. Flux is more composable and lightweight if you're comfortable with the CLI.
Free. CNCF graduated with strong community support despite Weaveworks' closure.
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