Flux CD Has a Free API — GitOps Continuous Delivery for Kubernetes

Flux CD is the CNCF graduated GitOps toolkit for Kubernetes. It automatically syncs your cluster state with Git repositories — any change in Git is applied to your cluster within seconds.

Free, open source, used by companies like Deutsche Telekom, SAP, and D2iQ.

Why Use Flux?

• True GitOps — Git is the single source of truth for your cluster
• Multi-tenancy — multiple teams, multiple repos, one cluster
• Helm & Kustomize — native support for both
• Image automation — auto-update deployments when new images are pushed
• Notifications — Slack, Teams, Discord alerts on deploy events

Quick Setup

1. Install Flux

# Bootstrap with GitHub
flux bootstrap github \
  --owner=my-org \
  --repository=fleet-infra \
  --branch=main \
  --path=clusters/production

# Check status
flux check

2. Add a Git Source

flux create source git my-app \
  --url=https://github.com/my-org/my-app \
  --branch=main \
  --interval=1m

# Check via kubectl
kubectl get gitrepositories -A
kubectl get gitrepositories my-app -o json | jq '{url: .spec.url, ready: .status.conditions[-1].status, revision: .status.artifact.revision}'

3. Create a Kustomization

flux create kustomization my-app \
  --source=GitRepository/my-app \
  --path=./deploy \
  --prune=true \
  --interval=5m

# Check status
kubectl get kustomizations -A

4. Add Helm Release

# Add Helm repository
flux create source helm bitnami \
  --url=https://charts.bitnami.com/bitnami \
  --interval=1h

# Install chart
flux create helmrelease nginx \
  --source=HelmRepository/bitnami \
  --chart=nginx \
  --values=./values.yaml

# Check releases
kubectl get helmreleases -A -o json | jq '.items[] | {name: .metadata.name, status: .status.conditions[-1].reason, revision: .status.lastAppliedRevision}'

5. Image Automation

# Watch for new images
flux create image repository my-app \
  --image=ghcr.io/my-org/my-app \
  --interval=5m

# Auto-update policy
flux create image policy my-app \
  --image-ref=my-app \
  --select-semver='>=1.0.0'

# Check latest image
kubectl get imagerepositories
kubectl get imagepolicies -o json | jq '.items[] | {name: .metadata.name, latest: .status.latestImage}'

Python Example

from kubernetes import client, config

config.load_kube_config()
api = client.CustomObjectsApi()

# List all Flux Kustomizations
kusts = api.list_cluster_custom_object(
    group="kustomize.toolkit.fluxcd.io", version="v1", plural="kustomizations")

for k in kusts["items"]:
    name = k["metadata"]["name"]
    ready = any(c["type"]=="Ready" and c["status"]=="True" for c in k.get("status",{}).get("conditions",[]))
    revision = k.get("status",{}).get("lastAppliedRevision","N/A")[:12]
    print(f"Kustomization: {name} | Ready: {ready} | Revision: {revision}")

# List Helm Releases
helms = api.list_cluster_custom_object(
    group="helm.toolkit.fluxcd.io", version="v2", plural="helmreleases")

for h in helms["items"]:
    print(f"HelmRelease: {h['metadata']['name']} | Chart: {h['spec']['chart']['spec']['chart']} | Version: {h.get('status',{}).get('lastAppliedRevision','pending')}")

Key Resources

Resource	Group	Description
GitRepository	source.toolkit.fluxcd.io	Git source
HelmRepository	source.toolkit.fluxcd.io	Helm chart source
Kustomization	kustomize.toolkit.fluxcd.io	Kustomize deployment
HelmRelease	helm.toolkit.fluxcd.io	Helm chart deployment
ImageRepository	image.toolkit.fluxcd.io	Image tracking
ImagePolicy	image.toolkit.fluxcd.io	Image update policy

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