Core Concepts of Flux and the GitOps Toolkit.
Flux is a tool for keeping Kubernetes clusters in sync with sources of configuration (like Git repositories), and automating updates to configuration when there is new code to deploy.
Flux version 2 (“Flux v2”) is built from the ground up to use Kubernetes' API extension system, and to integrate with Prometheus and other core components of the Kubernetes ecosystem. In version 2, Flux supports multi-tenancy and support for syncing an arbitrary number of Git repositories, among other long-requested features.
Flux v2 is constructed with the GitOps Toolkit, a set of composable APIs and specialized tools for building Continuous Delivery on top of Kubernetes.
Who is Flux for?
- cluster operators who automate provision and configuration of clusters;
- platform engineers who build continuous delivery for developer teams;
- app developers who rely on continuous delivery to get their code live.
The GitOps Toolkit is for platform engineers who want to make their own continuous delivery system, and have requirements not covered by Flux.
What can I do with Flux?
Flux is based on a set of Kubernetes API extensions (“custom
resources”), which control how git repositories and other sources of
configuration are applied into the cluster (“synced”).
For example, you create a
GitRepository object to mirror
configuration from a Git repository, then a
Kustomization object to
sync that configuration.
Flux works with Kubernetes' role-based access control (RBAC), so you can lock down what any particular sync can change. It can send notifications to Slack and other like systems when configuration is synced and ready, and receive webhooks to tell it when to sync.
flux command-line tool is a convenient way to bootstrap the
system in a cluster, and to access the custom resources that make up
Where do I start?
Get started with Flux v2!Following this guide will just take a couple of minutes to complete: After installing the
fluxCLI and running a couple of very simple commands, you will have a GitOps workflow setup which involves a staging and a production cluster.
If you should need help, please refer to our Support page.
More detail on what’s in Flux
- Source configuration from Git and Helm repositories, and S3-compatible buckets (e.g., Minio)
- Kustomize and Helm support
- Event-triggered and periodic reconciliation
- Integration with Kubernetes RBAC
- Health assessment (clusters and workloads)
- Dependency management (infrastructure and workloads)
- Alerting to external systems (webhook senders)
- External events handling (webhook receivers)
- Automated container image updates to Git (image scanning and patching)
- Policy-driven validation (OPA, Kyverno, admission controllers)
- Seamless integration with Git providers (GitHub, GitLab, Bitbucket)
- Interoperability with workflow providers (GitHub Actions, Tekton, Argo)
- Interoperability with Cluster API (CAPI) providers
Need help or want to contribute? Please see the links below. The Flux project is always looking for new contributors and there are a multitude of ways to get involved.
- Getting Started?
- Look at our Get Started guide and give us feedback
- Need help?
- First: Ask questions on our GH Discussions page
- Second: Talk to us in the #flux channel on CNCF Slack
- Please follow our Support Guidelines (in short: be nice, be respectful of volunteers' time, understand that maintainers and contributors cannot respond to all DMs, and keep discussions in the public #flux channel as much as possible).
- Have feature proposals or want to contribute?
Check out our events calendar, both with upcoming talks you can attend or past events videos you can watch.
We look forward to seeing you with us!
Get Started with Flux and the GitOps Toolkit.
Flux install, bootstrap, upgrade and uninstall documentation.
Flux and the GitOps Toolkit user guides.
Flux and the GitOps Toolkit use cases.
Migration guides for Flux v1 and Helm Operator users.
The GitOps Toolkit documentation.
The GitOps Toolkit development documentation.
The Flux Command-Line Interface documentation.
Flux and the GitOps Toolkit roadmap.
Flux and the GitOps Toolkit frequently asked questions.