hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/bin/start-secure-dns.sh

#!/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,
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# 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`

. "$bin"/../libexec/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