feat: Allow the user to set the operator update strategy

Signed-off-by: Tomas Tormo <[email protected]>

charts/cloudnative-pg/README.md

@@ -75,5 +75,6 @@ CloudNativePG Operator Helm Chart
 | serviceAccount.create | bool | `true` | Specifies whether the service account should be created. |
 | serviceAccount.name | string | `""` | The name of the service account to use. If not set and create is true, a name is generated using the fullname template. |
 | tolerations | list | `[]` | Tolerations for the operator to be installed. |
+| updateStrategy | object | `{}` | Update strategy for the operator. |
 | webhook | object | `{"livenessProbe":{"initialDelaySeconds":3},"mutating":{"create":true,"failurePolicy":"Fail"},"port":9443,"readinessProbe":{"initialDelaySeconds":3},"validating":{"create":true,"failurePolicy":"Fail"}}` | The webhook configuration. |
 

charts/cloudnative-pg/templates/deployment.yaml

@@ -29,6 +29,10 @@ spec:
   selector:
     matchLabels:
       {{- include "cloudnative-pg.selectorLabels" . | nindent 6 }}
+  {{- if .Values.updateStrategy }}
+  strategy:
+    {{- toYaml .Values.updateStrategy | nindent 4 }}
+  {{- end }}
   template:
     metadata:
       annotations:

charts/cloudnative-pg/values.yaml

@@ -32,6 +32,15 @@ fullnameOverride: ""
 hostNetwork: false
 dnsPolicy: ""
 
+# -- Update strategy for the operator.
+# ref: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#strategy
+# For example:
+#  type: RollingUpdate
+#  rollingUpdate:
+#    maxSurge: 25%
+#    maxUnavailable: 25%
+updateStrategy: {}
+
 crds:
   # -- Specifies whether the CRDs should be created when installing the chart.
   create: true