Allow service account to be set for Telegraf-DS

[sfitts]

This is the same change from #92 applied to the telegraf-ds chart.

Fixes #105

[jmorcar]

Here only is applied serviceaccount call in chart... but the complete serviceaccount creation where is it? Only use a call to serviceaccount in yaml deployment is not sufficient, and documentation chart not include any of that.

I refer to ClusterRole , ClusterRolebinding etc... like this

apiVersion: v1
kind: ServiceAccount
metadata:
  name: telegraf-reader
  namespace: default
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: telegraf-cluster-reader
  labels:
    rbac.authorization.k8s.io/aggregate-view-telegraf: "true"
    rbac.authorization.k8s.io/aggregate-view-telegraf-stats: "true"
rules:
  - nonResourceURLs: ["/stats", "/stats/*"]
    verbs: ["get", "watch", "list"]
  - apiGroups: [""]
    resources: ["persistentvolumes", "nodes", "pods", "deployments", "statefulsets", "nodes/proxy"]
    verbs: ["get", "watch", "list"]
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: telegraf-reader-role
aggregationRule:
  clusterRoleSelectors:
    - matchLabels:
        rbac.authorization.k8s.io/aggregate-view-telegraf-stats: "true"
    - matchLabels:
        rbac.authorization.k8s.io/aggregate-view-telegraf: "true"
    - matchLabels:
        rbac.authorization.k8s.io/aggregate-to-view: "true"
rules: [] # Rules are automatically filled in by the controller manager.
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: telegraf-reader-rolebinding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: telegraf-reader-role
subjects:
  - kind: ServiceAccount
    name: telegraf-reader
    namespace: default

I am using this config with kube_inventory plugin is fine, but with kubernetes input not working... I think is related with rbac definitions or maybe kubernetes plugin problem. I comment this in issues/6959#

[jmorcar]

An example of role definitions. If were possible to standardize a complete definition on template charts incluying that, for the almost kubernetes plugins.. or indicating in values.yaml how to add rules , verbs to rolebindings, this would complete the installation chart for kubernetes monitoring.

[nsteinmetz]

@jmorcar have a look at https://github.com/influxdata/helm-charts/tree/master/charts/telegraf-ds

This repo (tick-charts) is replaced by helm-charts one and we fixed the daemonset deployment