Flux

Flux is GitOps for Kubernetes done the CNCF way. Point it at a Git repo, and it continuously reconciles your cluster state with what's in the repo. Change a YAML file, push it, Flux deploys it. No CI pipeline needed for deployments.

If you want Kubernetes deployments triggered by Git commits — not Jenkins jobs — Flux is one of two real options. ArgoCD is the main competitor: flashier UI, more features, but heavier to run. Flux is lighter, more composable, and integrates better with Helm and Kustomize. On the commercial side, Harness and Codefresh wrap GitOps in enterprise packaging.

Best for teams that want simple, reliable Kubernetes deployments without a heavy CD platform. Pairs beautifully with Terraform (infra) + Flux (app deployments).

The catch: Flux has no built-in UI. You'll need a third-party dashboard (Weave GitOps) or live in the terminal. The multi-tenancy story is weaker than ArgoCD's. And at ~8K stars, the community is smaller — fewer Stack Overflow answers when you get stuck.