Add support for optional node selector labels for kube-ovn OVS/OVN pods

This change introduces a new Helm value ovsNodesLabels that allows
adding custom node selector labels to ovs-ovn pods. For example:
 ovsNodesLabels:
  kube-ovn/role: ovs
This is useful in environments such as OpenStack-Helm, where operators
may want to schedule OVS/OVN pods only on specific nodes (e.g., compute
nodes) instead of deploying them cluster-wide. When ovsNodesLabels is
empty, only the default selector kubernetes.io/os: linux is applied.

Signed-off-by: Saeed Padari <sam137115@gmail.com>

Author: saeed-mcu

charts/kube-ovn-v2/templates/agent/agent-daemonset.yaml

@@ -231,6 +231,7 @@ spec:
         {{- end }}
       nodeSelector:
         kubernetes.io/os: "linux"
+        {{ .Values.ovsNodesLabels | toYaml | nindent 8 }}
       volumes:
         - name: usr-local-sbin
           emptyDir: {}

charts/kube-ovn-v2/templates/ovs-ovn/ovs-ovn-daemonset.yaml

@@ -180,6 +180,7 @@ spec:
           {{- end }}
       nodeSelector:
         kubernetes.io/os: "linux"
+        {{ .Values.ovsNodesLabels | toYaml | nindent 8 }}
       volumes:
         - name: usr-local-sbin
           emptyDir: {}

charts/kube-ovn-v2/templates/pinger/pinger-daemonset.yaml

@@ -156,6 +156,7 @@ spec:
             periodSeconds: 10
       nodeSelector:
         kubernetes.io/os: "linux"
+        {{ .Values.ovsNodesLabels | toYaml | nindent 8 }}
       volumes:
         - name: host-run-ovs
           hostPath:

charts/kube-ovn-v2/values.yaml

@@ -47,6 +47,13 @@ masterNodesLabels:
   kube-ovn/role: master
   # node-role.kubernetes.io/control-plane: ""
 
+# -- Label used to auto-identify ovs node.
+# Any node that has any of these labels will be considered a ovs node.
+# Note: This feature uses Helm "lookup" function, which is not compatible with tools such as ArgoCD.
+# @section -- Global parameters
+ovsNodesLabels: []
+  # kube-ovn/role: ovs
+
 # -- General configuration of the network created by Kube-OVN.
 # @section -- Network parameters of the CNI
 # @default -- "{}"