[AAI] Added Rolling Update Strategy to graphAdmin

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: Ie5d0c5b454bd99022e5a2307e5813a92a8713ebd

2 files changed, 32 insertions, 0 deletions

diff --git a/kubernetes/aai/components/aai-graphadmin/templates/deployment.yaml b/kubernetes/aai/components/aai-graphadmin/templates/deployment.yaml
index 791bf61004..45e4802ede 100644
--- a/kubernetes/aai/components/aai-graphadmin/templates/deployment.yaml
+++ b/kubernetes/aai/components/aai-graphadmin/templates/deployment.yaml
@@ -32,6 +32,12 @@ 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" . }}
@@ -45,6 +51,7 @@ spec:
         checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
     spec:
       hostname: aai-graphadmin
+      terminationGracePeriodSeconds: {{ .Values.service.terminationGracePeriodSeconds }}
     {{ if .Values.global.initContainers.enabled }}
       initContainers:
       - command:
@@ -89,6 +96,10 @@ spec:
           value: {{ .Values.global.config.userId | quote }}
         - name: LOCAL_GROUP_ID
           value: {{ .Values.global.config.groupId | quote }}
+        - name: INTERNAL_PORT_1
+          value: {{ .Values.service.internalPort | quote }}
+        - name: INTERNAL_PORT_2
+          value: {{ .Values.service.internalPort2 | quote }}
         volumeMounts:
         - mountPath: /etc/localtime
           name: localtime
@@ -125,6 +136,18 @@ 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-graphadmin/values.yaml b/kubernetes/aai/components/aai-graphadmin/values.yaml
index 03d034bf05..c29004e837 100644
--- a/kubernetes/aai/components/aai-graphadmin/values.yaml
+++ b/kubernetes/aai/components/aai-graphadmin/values.yaml
@@ -125,6 +125,14 @@ 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 graphadmin deployment
 config:
@@ -204,6 +212,7 @@ service:
   internalPort: 8449
   portName2: aai-graphadmin-5005
   internalPort2: 5005
+  terminationGracePeriodSeconds: 120
 
 ingress:
   enabled: false