[stable/cluster-autoscaler] Add PDB (#4398)

* [stable/cluster-autoscaler] Add PDB

* [stable/cluster-autoscaler] Add missing Chart.yml meta

* Make maxUnavailable configurable

* Add labels and make configuration more robust

* Bump version for new feature

* Fixup readme

* Make pbb values a string to make it easier to switch off the default

stable/cluster-autoscaler/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 description: Scales worker nodes within autoscaling groups.
 icon: https://github.com/kubernetes/kubernetes/blob/master/logo/logo.png
 name: cluster-autoscaler
-version: 0.5.3
+version: 0.6.0
 appVersion: 1.1.0
 home: https://github.com/kubernetes/autoscaler
 sources:

stable/cluster-autoscaler/README.md

@@ -84,6 +84,7 @@ Parameter | Description | Default
 `image.tag` | Image tag (used if `cloudProvider=aws`) | `v1.1.0`
 `image.pullPolicy` | Image pull policy (used if `cloudProvider=aws`) | `IfNotPresent`
 `extraArgs` | additional container arguments | `{}`
+`podDisruptionBudget` | Pod disruption budget | `maxUnavailable: 1`
 `extraEnv` | additional container environment variables | `{}`
 `nodeSelector` | node labels for pod assignment | `{}`
 `podAnnotations` | annotations to add to each pod | `{}`

stable/cluster-autoscaler/templates/pdb.yaml

@@ -0,0 +1,17 @@
+{{- if .Values.podDisruptionBudget -}}
+apiVersion: policy/v1beta1
+kind: PodDisruptionBudget
+metadata:
+  labels:
+    app: {{ template "cluster-autoscaler.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+  name: {{ template "cluster-autoscaler.fullname" . }}
+spec:
+  selector:
+    matchLabels:
+      app: {{ template "cluster-autoscaler.name" . }}
+      release: {{ .Release.Name }}
+{{ .Values.podDisruptionBudget | indent 2 }}
+{{- end -}}

stable/cluster-autoscaler/values.yaml

@@ -39,6 +39,10 @@ extraArgs: {}
 ## Ref: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity
 ## affinity: {}
 
+podDisruptionBudget: |
+  maxUnavailable: 1
+  # minAvailable: 2
+
 ## Node labels for pod assignment
 ## Ref: https://kubernetes.io/docs/user-guide/node-selection/
 nodeSelector: {}