Introduce named volumes in Helm chart (#6972)

k8s/charts/seaweedfs/values.yaml

@@ -191,7 +191,7 @@ master:
   # Topology Spread Constraints Settings
   # This should map directly to the value of the topologySpreadConstraints
   # for a PodSpec. By Default no constraints are set.
-  topologySpreadConstraints: null
+  topologySpreadConstraints: ""
 
   # Toleration Settings for master pods
   # This should be a multi-line string matching the Toleration array
@@ -456,13 +456,13 @@ volume:
             matchLabels:
               app.kubernetes.io/name: {{ template "seaweedfs.name" . }}
               app.kubernetes.io/instance: {{ .Release.Name }}
-              app.kubernetes.io/component: volume
+              app.kubernetes.io/component: {{ $volumeName }}
           topologyKey: kubernetes.io/hostname
 
   # Topology Spread Constraints Settings
   # This should map directly to the value of the topologySpreadConstraints
   # for a PodSpec. By Default no constraints are set.
-  topologySpreadConstraints: null
+  topologySpreadConstraints: ""
 
   # Resource requests, limits, etc. for the server cluster placement. This
   # should map directly to the value of the resources field for a PodSpec,
@@ -538,6 +538,31 @@ volume:
     failureThreshold: 100
     timeoutSeconds: 30
 
+# Map of named volume groups for topology-aware deployments.
+# Each key inherits all fields from the `volume` section but can override
+# them locally—for example, replicas, nodeSelector, dataCenter, etc.
+# To switch entirely to this scheme, set `volume.enabled: false`
+# and define one entry per zone/data-center under `volumes`.
+#
+# volumes:
+#   dc1:
+#     replicas: 2
+#     dataCenter: "dc1"
+#     nodeSelector: |
+#      topology.kubernetes.io/zone: dc1
+#   dc2:
+#     replicas: 2
+#     dataCenter: "dc2"
+#     nodeSelector: |
+#      topology.kubernetes.io/zone: dc2
+#   dc3:
+#     replicas: 2
+#     dataCenter: "dc3"
+#     nodeSelector: |
+#      topology.kubernetes.io/zone: dc3
+#
+volumes: {}
+
 filer:
   enabled: true
   imageOverride: null
@@ -690,7 +715,7 @@ filer:
   # Topology Spread Constraints Settings
   # This should map directly to the value of the topologySpreadConstraints
   # for a PodSpec. By Default no constraints are set.
-  topologySpreadConstraints: null
+  topologySpreadConstraints: ""
 
   # updatePartition is used to control a careful rolling update of SeaweedFS
   # masters.
@@ -1146,7 +1171,7 @@ allInOne:
   # Topology Spread Constraints Settings
   # This should map directly to the value of the topologySpreadConstraints
   # for a PodSpec. By Default no constraints are set.
-  topologySpreadConstraints: null
+  topologySpreadConstraints: ""
 
   # Toleration Settings for master pods
   # This should be a multi-line string matching the Toleration array