changeAllIngressBackend.sh

#!/bin/bash
mkdir bkpIngressObjects
# clusters
for cluster in cluster1 cluster2
do
    mkdir bkpIngressObjects/${cluster}
    kubectl config use-context $cluster
    for ingObject in $(kubectl get ing -o custom-columns=NAME:.metadata.name | grep -v NAME)
        kubectl get ing/$ingObject -o json > bkpIngressObjects/${cluster}/${ingObject}.bkp.json
        kubectl get ing/$ingObject -o json | jq '(.spec.rules[].http.paths[].backend.serviceName) |= "maintenance-page"' > ing.tmp
        jq '(.spec.rules[].http.paths[].backend.servicePort) |= "80"' ing.txt | kubectl apply -f -
    done
    rm -f ing.tmp
done