[stable/mongodb-replicaset] liveness/startupProbe tuning (#23046)

* MongoDB liveness/startupProbe tuning

Signed-off-by: Bernard Grymonpon <bernard.grymonpon@oqton.com>

* Changes after review

- 1.18 as target k8s api version
- aligned the values and readme
- changed probe for the metrics server

Signed-off-by: Bernard Grymonpon <bernard.grymonpon@oqton.com>

stable/mongodb-replicaset/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: mongodb-replicaset
 home: https://github.com/mongodb/mongo
-version: 3.16.2
+version: 3.17.0
 appVersion: 3.6
 description: NoSQL document-oriented database that stores JSON-like documents with
   dynamic schemas, simplifying the integration of data in content-driven applications.

stable/mongodb-replicaset/README.md

@@ -108,6 +108,11 @@ The following table lists the configurable parameters of the mongodb chart and t
 | `readinessProbe.periodSeconds`      | Readiness probe period seconds                                            | `10`                                                |
 | `readinessProbe.successThreshold`   | Readiness probe success threshold                                         | `1`                                                 |
 | `readinessProbe.timeoutSeconds`     | Readiness probe timeout seconds                                           | `1`                                                 |
+| `startupProbe.failureThreshold`     | Startup probe failure threshold                                           | `60`                                                |
+| `startupProbe.initialDelaySeconds`  | Startup probe initial delay seconds                                       | `5`                                                 |
+| `startupProbe.periodSeconds`        | Startup probe period seconds                                              | `10`                                                |
+| `startupProbe.successThreshold`     | Startup probe success threshold                                           | `2`                                                 |
+| `startupProbe.timeoutSeconds`       | Startup probe timeout seconds                                             | `5`                                                 |
 | `extraContainers`                   | Additional containers to add to the StatefulSet                           | `[]`                                                |
 | `extraVars`                         | Set environment variables for the main container                          | `{}`                                                |
 | `extraLabels`                       | Additional labels to add to resources                                     | `{}`                                                |

stable/mongodb-replicaset/templates/mongodb-statefulset.yaml

@@ -221,6 +221,24 @@ spec:
             failureThreshold: {{ .Values.livenessProbe.failureThreshold }}
             periodSeconds: {{ .Values.livenessProbe.periodSeconds }}
             successThreshold: {{ .Values.livenessProbe.successThreshold }}
+{{- if semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion -}}
+          startupProbe:
+            exec:
+              command:
+                - mongo
+              {{- if .Values.tls.enabled }}
+                - --ssl
+                - --sslCAFile=/data/configdb/tls.crt
+                - --sslPEMKeyFile=/work-dir/mongo.pem
+              {{- end }}
+                - --eval
+                - "db.adminCommand('ping')"
+            initialDelaySeconds: {{ .Values.startupProbe.initialDelaySeconds }}
+            timeoutSeconds: {{ .Values.startupProbe.timeoutSeconds }}
+            failureThreshold: {{ .Values.startupProbe.failureThreshold }}
+            periodSeconds: {{ .Values.startupProbe.periodSeconds }}
+            successThreshold: {{ .Values.startupProbe.successThreshold }}
+{{- end }}
           readinessProbe:
             exec:
               command:
@@ -296,8 +314,24 @@ spec:
                   /bin/mongodb_exporter
                   --mongodb.uri {{ template "mongodb-replicaset.connection-string" . }}
                   --test
-            initialDelaySeconds: 30
-            periodSeconds: 10
+            initialDelaySeconds: {{ .Values.livenessProbe.initialDelaySeconds }}
+            periodSeconds: {{ .Values.livenessProbe.periodSeconds }}
+{{- if semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion -}}
+          startupProbe:
+            exec:
+              command:
+                - sh
+                - -c
+                - >-
+                  /bin/mongodb_exporter
+                  --mongodb.uri {{ template "mongodb-replicaset.connection-string" . }}
+                  --test
+            initialDelaySeconds: {{ .Values.startupProbe.initialDelaySeconds }}
+            timeoutSeconds: {{ .Values.startupProbe.timeoutSeconds }}
+            failureThreshold: {{ .Values.startupProbe.failureThreshold }}
+            periodSeconds: {{ .Values.startupProbe.periodSeconds }}
+            successThreshold: {{ .Values.startupProbe.successThreshold }}
+{{- end }}
 {{ end }}
         {{- if .Values.extraContainers }}
         {{- tpl (toYaml .Values.extraContainers) . | nindent 8 }}

stable/mongodb-replicaset/values.yaml

@@ -200,6 +200,15 @@ livenessProbe:
   periodSeconds: 10
   successThreshold: 1
 
+# Startup probe, will only be added since Kubernetes v1.16 or higher
+# When you have a lot of collections/indices, MongoDB need some time to start
+startupProbe:
+  initialDelaySeconds: 5
+  timeoutSeconds: 5
+  failureThreshold: 60
+  periodSeconds: 10
+  successThreshold: 2
+
 # Enables/disables the headless client service
 clientService:
   enabled: true