feat: PDB (#1871)

Signed-off-by: OMPRAKASH MISHRA <[email protected]>

.github/workflows/merge.yml

@@ -56,6 +56,8 @@ jobs:
         --set backend.deploymentStrategy=RollingUpdate
         --set frontend.deploymentStrategy=RollingUpdate
         --set global.autoscaling=true
+        --set frontend.pdb.enabled=true
+        --set backend.pdb.enabled=true
   promote:
     name: Promote Images
     needs: [deploy-prod, vars]

README.md

@@ -44,9 +44,13 @@ Features:
 * Helm Package Manager for atomic deployments
 * Prometheus Metrics export from Backend/Frontend
 * Resource Tuning with Horizontal Pod Autoscaler (in TEST/PROD).
+* Affinity and Anti-Affinity for Scheduling on different worker nodes
+* Rolling updates with zero downtime in PROD
+* Database Migrations with Flyway
+* Pod Disruption Budgets for High Availability
 * Self Healing through Health checks
 * Sample application stack:
-    * Database: Postgres, PostGIS, backups
+    * Database: Postgres, PostGIS, backups, Flyway
     * Frontend: TypeScript, Caddy Server
     * Backend: TypeScript, Nest.js
     * Alternative backends for [Java/Quarkus, Go/Fiber and Python/FastAPI](https://github.com/bcgov/quickstart-openshift-backends)

charts/app/templates/backend/templates/pdb.yaml

@@ -9,6 +9,6 @@ metadata:
 spec:
   selector:
     matchLabels:
-      app.kubernetes.io/name: {{ include "backend.fullname" . }}
+      {{- include "backend.selectorLabels" . | nindent 6 }}
   minAvailable: {{ .Values.backend.pdb.minAvailable }}
 {{- end }}

charts/app/templates/frontend/templates/pdb.yaml

@@ -1,13 +1,14 @@
 {{- if and .Values.frontend.pdb  .Values.frontend.pdb.enabled }}
 ---
 apiVersion: policy/v1
+kind: PodDisruptionBudget
 metadata:
   name: {{ include "frontend.fullname" . }}
   labels:
     {{- include "frontend.labels" . | nindent 4 }}
 spec:
   selector:
     matchLabels:
-      app.kubernetes.io/name: {{ include "frontend.fullname" . }}
+      {{- include "frontend.selectorLabels" . | nindent 6 }}
   minAvailable: {{ .Values.frontend.pdb.minAvailable }}
 {{- end }}

charts/app/values.yaml

@@ -107,6 +107,9 @@ frontend:
   ingress:
     annotations:
       route.openshift.io/termination: "edge"
+  pdb:
+    enabled: false # enable it in PRODUCTION for having pod disruption budget.
+    minAvailable: 1 # the minimum number of pods that must be available during the disruption budget.
 
 crunchy: # enable it for TEST and PROD, for PR based pipelines simply use single postgres
   enabled: false