csbell

0. Requirements: There are no prior existing ingresses.
1. Add/Update configmap in each cluster: kubectl --context <clusterA,clusterB...> edit cm/ingress-uid -n kube-system
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data:
  provider-uid: 34e7fb390cc1a5a5  # 16-char hexstring must be *unique* per cluster (value doesn't matter)
  uid: e3bb67f220a0f898  # 16-char hexstring must be the *same* in each cluster
###
2. Propagate same ingress object in each cluster (type should be of NodePort with same NodePort value).
kubectl --context <clusterA,clusterB...> create -f youringress.yaml