feat: add pdb for making pixxel services fault tolerant (#116)

* feat: add pdb for making pixxel services fault tolerant

* fix: added additional pod labels to deployment so that pdb can target only deployment pods

* fix: replaced to non org specific labels

* feat: bump in minor version for new feature addition

* feat: added min available condition, also added a condition such that pdb can only attach to deployment whose replica count > 1, added flag to switch on/off pdb

* fix: removed minAvailable

Author: ajinkya6

stable/app/Chart.yaml

@@ -15,4 +15,4 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.5.4
+version: 0.6.0

stable/app/templates/deployment.yaml

@@ -22,6 +22,7 @@ spec:
         {{- end }}
       labels:
         {{- include "app.selectorLabels" . | nindent 8 }}
+        app.kubernetes.io/component: "deployment"
     spec:
       {{- with .Values.imagePullSecrets }}
       imagePullSecrets:
@@ -113,4 +114,4 @@ spec:
       {{- with .Values.tolerations }}
       tolerations:
         {{- toYaml . | nindent 8 }}
-      {{- end }}
+      {{- end }}

stable/app/templates/poddisruptionbudget.yaml

@@ -0,0 +1,12 @@
+{{- if and .Values.pdb.enabled (gt .Values.replicaCount 1) }}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: "{{ template "app.fullname" . }}-pdb"
+spec:
+  maxUnavailable: {{ .Values.pdb.maxUnavailable }}
+  selector:
+    matchLabels:
+      {{- include "app.selectorLabels" . | nindent 6 }}
+      app.kubernetes.io/component: "deployment"
+{{- end }}

stable/app/values.yaml

@@ -78,6 +78,10 @@ resources: {}
   # --   cpu: 100m
   # --   memory: 128Mi
 
+pdb:
+  enabled: false
+  maxUnavailable: 1
+
 nodeSelector: {}
 
 tolerations: []