get-masters

#!/bin/sh

cmd='
[foreach .items[] as $item
([[],[]];0;
if ($item.kind == "Node") then
 (if ($item.metadata.labels|has("node-role.kubernetes.io/master")) then
  [([(foreach $item.status.addresses[] as $address
   ([[],[]];0;
   if $address.type == "ExternalIP" then $address.address else null end))])] | flatten | map (select (. != null))[0]
  else null end)
 else null end)]|flatten | map(select (. != null))[]'

out=$(oc get nodes -o json | jq -r "$cmd")

[[ -z $out ]] && {
    cmd='
[foreach .items[] as $item
([[],[]];0;
if ($item.kind == "Node") then
 (if ($item.metadata.labels|has("node-role.kubernetes.io/master")) then
  [([(foreach $item.status.addresses[] as $address
   ([[],[]];0;
   if $address.type == "ExternalIP" then $address.address else null end)),
   (foreach $item.status.addresses[] as $address
   ([[],[]];0;
   if $address.type == "InternalIP" then $address.address else null end))])] | flatten | map (select (. != null))[0]
  else null end)
 else null end)]|flatten | map(select (. != null))[]'
  out=$(oc get nodes -o json | jq -r "$cmd")
}
echo $out