feat: Pod disruption budget (#324)

Signed-off-by: camaeel <[email protected]>

Author: camaeel

deploy/charts/vault-operator/README.md

@@ -17,6 +17,8 @@ The following table lists the configurable parameters of the Helm chart.
 | Parameter | Type | Default | Description |
 | --- | ---- | ------- | ----------- |
 | `replicaCount` | int | `1` | Number of replicas (pods) to launch. |
+| `pdb.create` | bool | `true` | Create pod disruption budget if replicaCount > 1. |
+| `pdb.minAvailable` | int | `1` | Min available for PDB. |
 | `image.repository` | string | `"ghcr.io/bank-vaults/vault-operator"` | Name of the image repository to pull the container image from. |
 | `image.pullPolicy` | string | `"IfNotPresent"` | [Image pull policy](https://kubernetes.io/docs/concepts/containers/images/#updating-images) for updating already existing images on a node. |
 | `image.tag` | string | `""` | Image tag override for the default value (chart appVersion). |

deploy/charts/vault-operator/templates/pdb.yaml

@@ -0,0 +1,24 @@
+{{- if and .Values.pdb.create (gt (int .Values.replicaCount) 1)  }}
+apiVersion: {{ include "common.capabilities.policy.apiVersion" . }}
+kind: PodDisruptionBudget
+metadata:
+  name: {{ include "vault-operator.fullname" . }}
+  labels:
+    helm.sh/chart: {{ include "vault-operator.chart" . }}
+    app.kubernetes.io/name: {{ include "vault-operator.name" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+    {{- with .Values.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+spec:
+  {{- if .Values.pdb.minAvailable }}
+  minAvailable: {{ .Values.pdb.minAvailable }}
+  {{- end }}
+  {{- if .Values.pdb.maxUnavailable }}
+  maxUnavailable: {{ .Values.pdb.maxUnavailable }}
+  {{- end }}
+  selector:
+    matchLabels: 
+      app.kubernetes.io/name: {{ include "vault-operator.name" . }}
+{{- end }}

deploy/charts/vault-operator/values.yaml

@@ -5,6 +5,14 @@
 # -- Number of replicas (pods) to launch.
 replicaCount: 1
 
+pdb:
+  # -- Create pod disruption budget if replicaCount > 1.
+  create: true
+  # -- Min available for PDB.
+  minAvailable: 1
+  # -- Max unavailable for PDB.
+  # maxUnavailable: 1
+
 image:
   # -- Name of the image repository to pull the container image from.
   repository: ghcr.io/bank-vaults/vault-operator