[AAI] Added Rolling Update Strategy

Addded preStop hook to let long-running tasks be finished
before the SIGTERM is invoked

Issue-ID: AAI-3368
Signed-off-by: Mohammad Hosnidokht <mohammad.hosnidokht@yoppworks.com>
Change-Id: I02cc0068a3588d94b3da9414685e6cd798e9976f

2 files changed, 32 insertions, 0 deletions

diff --git a/kubernetes/aai/components/aai-resources/templates/deployment.yaml b/kubernetes/aai/components/aai-resources/templates/deployment.yaml
index 501a706f47..fd4b1c3dc1 100644
--- a/kubernetes/aai/components/aai-resources/templates/deployment.yaml
+++ b/kubernetes/aai/components/aai-resources/templates/deployment.yaml
@@ -29,6 +29,12 @@ metadata:
     heritage: {{ .Release.Service }}
 spec:
   replicas: {{ .Values.replicaCount }}
+  minReadySeconds: {{ .Values.minReadySeconds }}
+  strategy:
+    type: {{ .Values.updateStrategy.type }}
+    rollingUpdate:
+      maxUnavailable: {{ .Values.updateStrategy.maxUnavailable }}
+      maxSurge: {{ .Values.updateStrategy.maxSurge }}
   selector:
     matchLabels:
       app: {{ include "common.name" . }}
@@ -72,6 +78,7 @@ spec:
       {{- end }}
     spec:
       hostname: aai-resources
+      terminationGracePeriodSeconds: {{ .Values.service.terminationGracePeriodSeconds }}
       initContainers: {{ include "common.certInitializer.initContainer" . | nindent 6 }}
       - name: {{ include "common.name" . }}-readiness
         command:
@@ -125,6 +132,10 @@ spec:
           value: '-Djavax.net.ssl.trustStore={{ .Values.certInitializer.credsPath }}/truststoreONAPall.jks -Djavax.net.ssl.trustStorePassword={{ .Values.certInitializer.truststorePassword }}'
         - name: TRUSTORE_ALL_PASSWORD
           value: {{ .Values.certInitializer.truststorePassword }}
+        - name: INTERNAL_PORT_1
+          value: {{ .Values.service.internalPort | quote }}
+        - name: INTERNAL_PORT_2
+          value: {{ .Values.service.internalPort2 | quote }}
         volumeMounts: {{ include "common.certInitializer.volumeMount" . | nindent 8 }}
         - mountPath: /etc/localtime
           name: localtime
@@ -173,6 +184,18 @@ spec:
         ports:
         - containerPort: {{ .Values.service.internalPort }}
         - containerPort: {{ .Values.service.internalPort2 }}
+        lifecycle:
+          # wait for active requests (long-running tasks) to be finished
+          # Before the SIGTERM is invoked, Kubernetes exposes a preStop hook in the Pod.
+          preStop:
+            exec:
+              command:
+                - sh
+                - -c
+                - |
+                  while (netstat -an | grep ESTABLISHED | grep -e $INTERNAL_PORT_1 -e $INTERNAL_PORT_2)
+                  do sleep 10
+                  done
         # disable liveness probe when breakpoints set in debugger
         # so K8s doesn't restart unresponsive container
         {{- if .Values.liveness.enabled }}
diff --git a/kubernetes/aai/components/aai-resources/values.yaml b/kubernetes/aai/components/aai-resources/values.yaml
index c2658a5503..2ec78c57c4 100644
--- a/kubernetes/aai/components/aai-resources/values.yaml
+++ b/kubernetes/aai/components/aai-resources/values.yaml
@@ -161,6 +161,14 @@ flavor: small
 flavorOverride: small
 # default number of instances
 replicaCount: 1
+# the minimum number of seconds that a newly created Pod should be ready
+minReadySeconds: 30
+updateStrategy:
+  type: RollingUpdate
+  # The number of pods that can be unavailable during the update process
+  maxUnavailable: 0
+  # The number of pods that can be created above the desired amount of pods during an update
+  maxSurge: 1
 
 # Configuration for the resources deployment
 config:
@@ -220,6 +228,7 @@ service:
   internalPort: 8447
   portName2: aai-resources-5005
   internalPort2: 5005
+  terminationGracePeriodSeconds: 120
 
 ingress:
   enabled: false