start-secure-dns.sh
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start-secure-dns.sh
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			#!/usr/bin/env bash

			# Licensed to the Apache Software Foundation (ASF) under one or more
			# contributor license agreements. See the NOTICE file distributed with
			# this work for additional information regarding copyright ownership.
			# The ASF licenses this file to You under the Apache License, Version 2.0
			# (the "License"); you may not use this file except in compliance with
			# the License. You may obtain a copy of the License at
			#
			# http://www.apache.org/licenses/LICENSE-2.0
			#
			# Unless required by applicable law or agreed to in writing, software
			# distributed under the License is distributed on an "AS IS" BASIS,
			# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
			# See the License for the specific language governing permissions and
			# limitations under the License.

			# Run as root to start secure datanodes in a security-enabled cluster.

			usage="Usage (run as root in order to start secure datanodes): start-secure-dns.sh"

			bin=`dirname "${BASH_SOURCE-$0}"`
			bin=`cd "$bin"; pwd`

			DEFAULT_LIBEXEC_DIR="$bin"/../libexec
			HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
			. $HADOOP_LIBEXEC_DIR/hdfs-config.sh

			if [ "$EUID" -eq 0 ] && [ -n "$HADOOP_SECURE_DN_USER" ]; then
			"$HADOOP_PREFIX"/sbin/hadoop-daemons.sh --config $HADOOP_CONF_DIR --script "$bin"/hdfs start datanode $dataStartOpt
			else
			echo $usage
			fi