feature(leader_election): flag to disable leader election feature on controller (#11064)

charts/ingress-nginx/README.md

@@ -293,6 +293,7 @@ As of version `1.26.0` of this chart, by simply not providing any clusterIP valu
 | controller.containerSecurityContext | object | `{}` | Security context for controller containers |
 | controller.customTemplate.configMapKey | string | `""` |  |
 | controller.customTemplate.configMapName | string | `""` |  |
+| controller.disableLeaderElection | bool | `false` | This configuration disable Nginx Controller Leader Election |
 | controller.dnsConfig | object | `{}` | Optionally customize the pod dnsConfig. |
 | controller.dnsPolicy | string | `"ClusterFirst"` | Optionally change this to ClusterFirstWithHostNet in case you have 'hostNetwork: true'. By default, while using host network, name resolution uses the host's DNS. If you wish nginx-controller to keep resolving names inside the k8s network, use ClusterFirstWithHostNet. |
 | controller.electionID | string | `""` | Election ID to use for status update, by default it uses the controller name combined with a suffix of 'leader' |

charts/ingress-nginx/templates/_params.tpl

@@ -60,6 +60,9 @@
 {{- if .Values.controller.enableTopologyAwareRouting }}
 - --enable-topology-aware-routing=true
 {{- end }}
+{{- if .Values.controller.disableLeaderElection }}
+- --disable-leader-election=true
+{{- end }}
 {{- range $key, $value := .Values.controller.extraArgs }}
 {{- /* Accept keys without values or with false as value */}}
 {{- if eq ($value | quote | len) 2 }}

charts/ingress-nginx/values.yaml

@@ -83,6 +83,8 @@ controller:
   # -- This configuration enables Topology Aware Routing feature, used together with service annotation service.kubernetes.io/topology-mode="auto"
   # Defaults to false
   enableTopologyAwareRouting: false
+  # -- This configuration disable Nginx Controller Leader Election
+  disableLeaderElection: false
   # -- This configuration defines if Ingress Controller should allow users to set
   # their own *-snippet annotations, otherwise this is forbidden / dropped
   # when users add those annotations.