#!/bin/bash
cloudconfig=$(cat <<EOF
    if host \$NAMESERVER 1>/dev/null 2>&1; then
    case \$reason in
    BOUND|RENEW|REBIND|REBOOT) nsupdate -k /var/lib/dhcp/nsupdate.key << EOX
    server \$NAMESERVER
    update delete \$HOST_NAME A
    update add \$HOST_NAME \$TTL A \$HOST_ADDR
    send
    EOX
    ;;
    esac
    fi
EOF
)

echo "${cloudconfig}"
echo $BASH_VERSION