PRO-2745: allow sticky sessions to be enabled (#41)

* PRO-2745: allow sticky sessions to be enabled

* chart bump

* fix spaces

charts/application-core/Chart.yaml

@@ -15,4 +15,7 @@ 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: 1.2.0
+version: 1.3.0
+
+maintainers:
+  - name: Dominic DePasquale

charts/application-core/templates/ingress.yaml

@@ -12,6 +12,22 @@ metadata:
     {{- include "application-core.annotations" $ | nindent 4 }}
     {{- toYaml . | nindent 4 }}
   {{- end }}
+    {{- if not .Values.sessionAffinity.enabled }}
+    nginx.ingress.kubernetes.io/service-upstream: "true"
+    {{- end}}
+    {{- if .Values.sessionAffinity.enabled }}
+    nginx.ingress.kubernetes.io/affinity: "cookie"
+    {{- if .Values.sessionAffinity.cookieName }}
+    nginx.ingress.kubernetes.io/session-cookie-name: {{ .Values.sessionAffinity.cookieName | quote }}
+    {{- end }}
+    {{- if .Values.sessionAffinity.mode }}
+    nginx.ingress.kubernetes.io/affinity-mode: {{ .Values.sessionAffinity.mode | quote }}
+    {{- end }}
+    nginx.ingress.kubernetes.io/configuration-snippet: | 
+      {{- if .Values.sessionAffinity.enabled }}
+      proxy_set_header l5d-dst-override $service_name.$namespace.svc.cluster.local:$service_port;
+      {{- end }}
+    {{- end }}
 spec:
   ingressClassName: {{ .Values.ingress.className }}
   {{- if .Values.ingress.tls }}

charts/application-core/values.yaml

@@ -59,11 +59,15 @@ service:
   type: ClusterIP
   port: 8000
 
+sessionAffinity:
+  enabled: false
+  # cookieName: "JSESSIONID"
+  mode: persistent  # persistent|balanced
+
 ingress:
   enabled: false
   className: "nginx"
   annotations:
-    nginx.ingress.kubernetes.io/service-upstream: "true"
     external-dns.alpha.kubernetes.io/ingress-hostname-source: annotation-only
     # kubernetes.io/tls-acme: "true"
   hosts: