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Use flux support helm chart propagation

Flux is most useful when used as a deployment tool at the end of a Continuous Delivery pipeline. Flux will make sure that your new container images and config changes are propagated to the cluster.

Start up Karmada clusters

You just need to clone Karmada repo, and run the following script in Karmada directory.

hack/local-up-karmada.sh

Start up flux

curl -s https://fluxcd.io/install.sh | sudo bash

Install the toolkit controllers in the flux-system namespace:

flux install

tips:

The flux tool is installed on each cluster,Using flux Install requires scientific surfing

If flux is successfully installed, you can see the following Pod

[root@10-6-201-150 ~]# kubectl get pod -n flux-system
NAME                                       READY   STATUS    RESTARTS   AGE
helm-controller-55896d6ccf-dlf8b           1/1     Running   0          15d
kustomize-controller-76795877c9-mbrsk      1/1     Running   0          15d
notification-controller-7ccfbfbb98-lpgjl   1/1     Running   0          15d
source-controller-6b8d9cb5cc-7dbcb         1/1     Running   0          15d

helm chart propagation

Define a HelmRepository source

apiVersion: source.toolkit.fluxcd.io/v1beta1
kind: HelmRepository
metadata:
  name: podinfo
spec:
  interval: 1m
  url: https://stefanprodan.github.io/podinfo     
--- 
apiVersion: policy.karmada.io/v1alpha1
kind: PropagationPolicy
metadata:
  name: helm-repo
spec:
  resourceSelectors:
    - apiVersion: source.toolkit.fluxcd.io/v1beta1
      kind: HelmRepository
      name: podinfo
  placement:
    clusterAffinity:
      clusterNames:
        - member1
        - member2

Define a HelmRelease source

apiVersion: helm.toolkit.fluxcd.io/v2beta1
kind: HelmRelease
metadata:
  name: podinfo
spec:
  interval: 5m
  chart:
    spec:
      chart: podinfo
      version: 5.0.3
      sourceRef:
        kind: HelmRepository
        name: podinfo
---
apiVersion: policy.karmada.io/v1alpha1
kind: PropagationPolicy
metadata:
  name: helm-release
spec:
  resourceSelectors:
    - apiVersion: helm.toolkit.fluxcd.io/v2beta1
      kind: HelmRelease
      name: podinfo
  placement:
    clusterAffinity:
      clusterNames:
        - member1
        - member2

Apply those YAML to karmada-apiserver

[root@10-6-201-150 helm]# kubectl apply -f ../helm/
helmrelease.helm.toolkit.fluxcd.io/podinfo created
helmrepository.source.toolkit.fluxcd.io/podinfo created
propagationpolicy.policy.karmada.io/helm-release created
propagationpolicy.policy.karmada.io/helm-repo created

Switch to the distributed cluster

[root@10-6-201-150 ~]# kubectl config use-context member2
Switched to context "member2".
[root@10-6-201-150 ~]# kubectl get pod
NAME                      READY   STATUS    RESTARTS   AGE
podinfo-78c475b77-94x54   1/1     Running   0          104s
[root@10-6-201-150 ~]# helm list -A
NAME   	NAMESPACE	REVISION	UPDATED                               	STATUS  	CHART        	APP VERSION
podinfo	default  	1       	2022-05-21 07:14:50.73460681 +0000 UTC	deployed	podinfo-5.0.3	5.0.3
[root@10-6-201-150 ~]#

kustomize propagation

Define a Git repository source

apiVersion: source.toolkit.fluxcd.io/v1beta1
kind: GitRepository
metadata:
  name: podinfo
spec:
  interval: 1m
  url: https://github.com/stefanprodan/podinfo
  ref:
    branch: master
---
apiVersion: policy.karmada.io/v1alpha1
kind: PropagationPolicy
metadata:
  name: kust-git
spec:
  resourceSelectors:
    - apiVersion: source.toolkit.fluxcd.io/v1beta1
      kind: GitRepository
      name: podinfo
  placement:
    clusterAffinity:
      clusterNames:
        - member1
        - member2

Define a kustomization

apiVersion: kustomize.toolkit.fluxcd.io/v1beta2
kind: Kustomization
metadata:
  name: podinfo-dev
spec:
  interval: 5m
  path: "./deploy/overlays/dev/"
  prune: true
  sourceRef:
    kind: GitRepository
    name: podinfo
  validation: client
  timeout: 80s
---
apiVersion: policy.karmada.io/v1alpha1
kind: PropagationPolicy
metadata:
  name: kust-release
spec:
  resourceSelectors:
    - apiVersion: kustomize.toolkit.fluxcd.io/v1beta2
      kind: Kustomization
      name: podinfo-dev
  placement:
    clusterAffinity:
      clusterNames:
        - member1
        - member2