Kubectl "top pods-" on a given node

kubectl-top_node_pod

#!/bin/bash

function usage()
{
    echo Usage: $0 '[--cpu/-c|--memory/-m]' nodes...
    echo Sort by memory is the default
    exit ${1:-0}
}

node_names=()
sort_field=memory

while [ $# -gt 0 ]; do
    case "$1" in
        -c|--cpu)
            sort_field=cpu
        ;;
        -m|--memory)
            sort_field=memory
        ;;
        -h|--help)
            usage
        ;;
        *)
            node_names+=($1)
    esac
    shift
done

if [ "${#node_names[*]}" -lt 1 ]; then
    usage 1
fi


_IFS="$IFS" IFS='|'
kubectl top node --sort-by=$sort_field | grep -E "^(NAME|${node_names[*]})"
IFS="$_IFS"

for node_name in ${node_names[@]}; do
    echo
    t="Topping node $node_name"
    echo "$t"
    printf "%-${#t}s\n" = | tr ' ' =


    tpl='{{range $index, $pod := .items}}{{ if $index }}|{{else}}^({{end}}{{$pod.metadata.namespace}}\s+{{$pod.metadata.name}}\s{{end}}|NAME|[^a-zA-Z]).*'
    regex=$(kubectl get pod --field-selector=spec.nodeName=$node_name -A -o template --template="$tpl") || exit 1

    kubectl top pod --all-namespaces --sort-by=$sort_field $@ | grep --color=no -E "$regex"
done