Add docs on "How to deploy Radius via helm chart using flux"

[Reshrahim]

Following the thread here - https://discord.com/channels/1113519723347456110/1113519723930468455/1181873374281080883

User needs some guidance on the following

"An example on how to deploy the helm chart using flux would be a great start. I feel there is something missing from the documentation. I had defined the namespace, and got issues with securityContext already exist... figured it could be that the helm chart created a namespace and set some permissions. after removing my namespace flux does not run the helm chart, and i guess its missing some mandatory configuration."

AB#10670

[rynowak]

Thanks @Reshrahim - We need to produce an example here, and then make sure that this works as-expected. It's possible we might have a few bugs. Regardless this should end up in the docs when we're done 👍

[ehrnst]

I'll add some more context on what happens in our AKS cluster

As usual when doing install through flux and kustomize we create three files. The helm deployment yaml file, a kustomize file and a namespace yaml. Below is my bare deployment of the YAML.

apiVersion: source.toolkit.fluxcd.io/v1beta2
kind: HelmRepository
metadata:
  name: radius
  namespace: radius-system
spec:
  url: https://radius.azurecr.io/helm/v1/repo
  interval: 10m

---

apiVersion: helm.toolkit.fluxcd.io/v2beta1
kind: HelmRelease
metadata:
  name: radius
  namespace: radius-system
spec:
  interval: 5m
  timeout: 15m0s
  chart:
    spec:
      chart: radius
      version: "0.27.0"
      sourceRef:
        kind: HelmRepository
        name: radius
        namespace: radius-system
      interval: 1m

From our flux logs i can see the following error

"level":"error","ts":"2023-12-07T07:21:25.575Z","msg":"Reconciler error","controller":"helmrelease","controllerGroup":"helm.toolkit.fluxcd.io","controllerKind":"HelmRelease","HelmRelease":{"name":"radius","namespace":"radius-system"},"namespace":"radius-system","name":"radius","reconcileID":"ab3b2bd4-7470-4724-88df-b8aa9d36f54e","error":"Helm install failed: error while running post render on files: map[string]interface {}(nil): yaml: unmarshal errors:\n  line 62: mapping key \"securityContext\" already defined at line 55"}

I had a brief look at the charts yaml files, and securityContext is defined. However I only see one per deployment

[rynowak]

Thanks @ehrnst this is helpful 👍