From 6a0bbda8a583f53f003a0ed3df60809d0a27bec3 Mon Sep 17 00:00:00 2001
From: Nathanael Liechti <technat@technat.ch>
Date: Tue, 19 Dec 2023 17:17:41 +0000
Subject: [PATCH] feat(helm): add topologySpreadConstraints and PDB

---
 charts/podinfo/templates/deployment.yaml |  4 ++++
 charts/podinfo/templates/pdb.yaml        | 14 ++++++++++++++
 charts/podinfo/values.yaml               |  7 +++++++
 3 files changed, 25 insertions(+)
 create mode 100644 charts/podinfo/templates/pdb.yaml

diff --git a/charts/podinfo/templates/deployment.yaml b/charts/podinfo/templates/deployment.yaml
index 87ed3735..aa2f7fb0 100644
--- a/charts/podinfo/templates/deployment.yaml
+++ b/charts/podinfo/templates/deployment.yaml
@@ -203,3 +203,7 @@ spec:
         secret:
           secretName: {{ template "podinfo.tlsSecretName" . }}
       {{- end }}
+    {{- with .Values.topologySpreadConstraints }}
+      topologySpreadConstraints:
+{{- toYaml . | nindent 8 }}
+    {{- end }}
\ No newline at end of file
diff --git a/charts/podinfo/templates/pdb.yaml b/charts/podinfo/templates/pdb.yaml
new file mode 100644
index 00000000..9057132f
--- /dev/null
+++ b/charts/podinfo/templates/pdb.yaml
@@ -0,0 +1,14 @@
+{{- if and .Values.podDisruptionBudget (gt (int .Values.replicaCount) 1) }}
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: {{ include "podinfo.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "podinfo.labels" . | nindent 4 }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "podinfo.selectorLabels" . | nindent 6 }}
+  {{- toYaml .Values.podDisruptionBudget | nindent 2 }}
+{{- end }}
diff --git a/charts/podinfo/values.yaml b/charts/podinfo/values.yaml
index 98ddbbb3..fddbf735 100644
--- a/charts/podinfo/values.yaml
+++ b/charts/podinfo/values.yaml
@@ -142,6 +142,13 @@ affinity: {}
 
 podAnnotations: {}
 
+# https://kubernetes.io/docs/concepts/workloads/pods/pod-topology-spread-constraints/
+topologySpreadConstraints: []
+
+# Disruption budget will be configured only when the replicaCount is greater than 1
+podDisruptionBudget: {}
+#  maxUnavailable: 1
+
 # https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes
 probes:
   readiness: