Adds pod disruption budget to Graylog

Signed-off-by: Alek Hrycaiko <[email protected]>

charts/graylog/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: graylog
 home: https://www.graylog.org
-version: 2.3.4
+version: 2.3.5
 appVersion: 5.0.3
 description: Graylog is the centralized log management solution built to open
   standards for capturing, storing, and enabling real-time analysis of terabytes

charts/graylog/templates/pod_disruption_budget.yaml

@@ -0,0 +1,18 @@
+{{- if .Values.graylog.podDisruptionBudget.create }}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: {{ template "graylog.fullname" . }}
+  labels:
+{{ include "graylog.metadataLabels" . | indent 4 }}
+spec:
+  {{- with .Values.graylog.podDisruptionBudget.minAvailable }}
+  minAvailable: {{ . }}
+  {{- end }}
+  {{- with .Values.graylog.podDisruptionBudget.maxUnavailable }}
+  maxUnavailable: {{ . }}
+  {{- end }}
+  selector:
+    matchLabels:
+{{ include "graylog.selectorLabels" . | indent 6 }}
+{{- end }}

charts/graylog/values.yaml

@@ -361,6 +361,13 @@ graylog:
   ##
   # maxUnavailable: 10%
 
+  ## See `kubectl explain poddisruptionbudget.spec` for more
+  ## ref: https://kubernetes.io/docs/tasks/run-application/configure-pdb/
+  podDisruptionBudget:
+    create: false
+    minAvailable: 1
+    #maxUnavailable: 1
+
   ## Graylog server pod termination grace period
   ##
   terminationGracePeriodSeconds: 120