Wraps original `check_ntp` to check NTP server by hostname instead of IP

check_ntp_by_hostname.sh

#!/bin/bash

TMP=$(mktemp)

for IP in $(dig +short 1.south-america.pool.ntp.org) ; do
        rm -f $TMP > /dev/null 2> /dev/null
        /usr/lib/nagios/plugins/check_ntp -H $IP > $TMP 2>&1
        EXIT_STATUS=$?

        if [ "$EXIT_STATUS" -eq 0 ] ; then
                break
        fi
done

cat $TMP
rm -f $TMP > /dev/null 2> /dev/null
exit $EXIT_STATUS