##### /etc/hosts #######################################################

10.42.23.101	master.cluster	master
10.42.23.102	slave1.cluster	slave1
10.42.23.103	slave2.cluster	slave2


##### /etc/profile.d/99-hadoop.sh ######################################

export HADOOP_PREFIX="/opt/hadoop"
export PATH="$PATH:/opt/hadoop/bin:/opt/hadoop/sbin"


##### /opt/hadoop/etc/hadoop/hadoop-env.sh #############################

export JAVA_HOME="/usr/lib/jvm/java-7-oracle"


##### /opt/hadoop/etc/hadoop/core-site.xml #############################

<configuration>
  <property>
    <name>fs.defaultFS</name>
    <value>hdfs://master:9000</value>
  </property>
</configuration>


##### /opt/hadoop/etc/hadoop/hdfs-site.xml #############################

<configuration>
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>/home/hadoop-admin/dfs/dn</value>
  </property>
  <property>
    <name>dfs.namenode.name.dir</name>
    <value>/home/hadoop-admin/dfs/nn</value>
  </property>
  <property>
    <name>dfs.permission.supergroup</name>
    <value>hadoop-admin</value>
  </property>
</configuration>


##### /opt/hadoop/etc/hadoop/mapred-site.xml ###########################

<configuration>
  <property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
  </property>
</configuration>


##### /opt/hadoop/etc/hadoop/yarn-site.xml #############################

<configuration>
  <property>
    <name>yarn.resourcemanager.hostname</name>
    <value>master</value>
  </property>
  <property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
  </property>
</configuration>


##### /opt/hadoop/etc/hadoop/slaves ####################################

slave1
slave2


##### COPYING THE CONFIGURATION ########################################

ssh slave1 (or slave2)
scp -r master:/opt/hadoop .
scp master:/etc/profile.d/99-hadoop.sh .
sudo mv hadoop /opt/hadoop
sudo cp 99-hadoop.sh /etc/profile.d/
rm 99-hadoop.sh
logout