Add persistentVolumeClaimRetentionPolicy variable to values.yaml

This variable is used to set the persistentVolumeClaimRetentionPolicy value in the server-statefulset.yaml template, which is used to configure the retention policy for the PVCs used by the server statefulset.
hashicorp · Nov 8, 2023 · c782cbb · c782cbb
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commit c782cbb
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diff --git a/templates/server-statefulset.yaml b/templates/server-statefulset.yaml
@@ -24,6 +24,9 @@ spec:
   replicas: {{ template "vault.replicas" . }}
   updateStrategy:
     type: {{ .Values.server.updateStrategyType }}
+  {{- if and (semverCompare ">= 1.23-0" .Capabilities.KubeVersion.Version) (.Values.server.persistentVolumeClaimRetentionPolicy) }}
+  persistentVolumeClaimRetentionPolicy: {{ toYaml .Values.server.persistentVolumeClaimRetentionPolicy | nindent 4 }}
+  {{- end }}
   selector:
     matchLabels:
       app.kubernetes.io/name: {{ template "vault.name" . }}

diff --git a/test/unit/server-statefulset.bats b/test/unit/server-statefulset.bats
@@ -221,6 +221,73 @@ load _helpers
   [ "${actual}" = "OnDelete" ]
 }
 
+#--------------------------------------------------------------------
+# persistentVolumeClaimRetentionPolicy
+
+@test "server/standalone-StatefulSet: persistentVolumeClaimRetentionPolicy not set by default when kubernetes < 1.23" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -s templates/server-statefulset.yaml  \
+      --kube-version "1.22" \
+      . | tee /dev/stderr |
+      yq -r '.spec.persistentVolumeClaimRetentionPolicy' | tee /dev/stderr)
+  [ "${actual}" = "null" ]
+}
+
+@test "server/standalone-StatefulSet: unset persistentVolumeClaimRetentionPolicy.whenDeleted when kubernetes < 1.23" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -s templates/server-statefulset.yaml  \
+      --kube-version "1.22" \
+      --set 'server.persistentVolumeClaimRetentionPolicy.whenDeleted=Delete' \
+      . | tee /dev/stderr |
+      yq -r '.spec.persistentVolumeClaimRetentionPolicy.whenDeleted' | tee /dev/stderr)
+  [ "${actual}" = "null" ]
+}
+
+@test "server/standalone-StatefulSet: unset persistentVolumeClaimRetentionPolicy.whenScaled when kubernetes < 1.23" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -s templates/server-statefulset.yaml  \
+      --kube-version "1.22" \
+      --set 'server.persistentVolumeClaimRetentionPolicy.whenScaled=Delete' \
+      . | tee /dev/stderr |
+      yq -r '.spec.persistentVolumeClaimRetentionPolicy.whenScaled' | tee /dev/stderr)
+  [ "${actual}" = "null" ]
+}
+
+@test "server/standalone-StatefulSet: persistentVolumeClaimRetentionPolicy not set by default when kubernetes >= 1.23" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -s templates/server-statefulset.yaml  \
+      --kube-version "1.23" \
+      . | tee /dev/stderr |
+      yq -r '.spec.persistentVolumeClaimRetentionPolicy' | tee /dev/stderr)
+  [ "${actual}" = "null" ]
+}
+
+@test "server/standalone-StatefulSet: can set persistentVolumeClaimRetentionPolicy.whenDeleted when kubernetes >= 1.23" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -s templates/server-statefulset.yaml  \
+      --kube-version "1.23" \
+      --set 'server.persistentVolumeClaimRetentionPolicy.whenDeleted=Delete' \
+      . | tee /dev/stderr |
+      yq -r '.spec.persistentVolumeClaimRetentionPolicy.whenDeleted' | tee /dev/stderr)
+  [ "${actual}" = "Delete" ]
+}
+
+@test "server/standalone-StatefulSet: can set persistentVolumeClaimRetentionPolicy.whenScaled when kubernetes >= 1.23" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -s templates/server-statefulset.yaml  \
+      --kube-version "1.23" \
+      --set 'server.persistentVolumeClaimRetentionPolicy.whenScaled=Delete' \
+      . | tee /dev/stderr |
+      yq -r '.spec.persistentVolumeClaimRetentionPolicy.whenScaled' | tee /dev/stderr)
+  [ "${actual}" = "Delete" ]
+}
+
 #--------------------------------------------------------------------
 # replicas
 

diff --git a/values.yaml b/values.yaml
@@ -756,6 +756,14 @@ server:
     # Annotations to apply to the PVC
     annotations: {}
 
+  # Persistent Volume Claim (PVC) retention policy
+  # ref: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#persistentvolumeclaim-retention
+  # Example:
+  # persistentVolumeClaimRetentionPolicy:
+  #   whenDeleted: Retain
+  #   whenScaled: Retain
+  persistentVolumeClaimRetentionPolicy: {}
+
   # This configures the Vault Statefulset to create a PVC for audit
   # logs.  Once Vault is deployed, initialized, and unsealed, Vault must
   # be configured to use this for audit logs.  This will be mounted to