上一节已经说道持久化IP和安装JDK
这一节继续搭建Hadoop分布式开发环境

一、安装Hadoop包

1、使用下载的hadoop-2.7.2.tar.gz，上传到虚拟机的/usr/local目录下。

2、将hadoop包进行解压缩：

   tar -zxvf hadoop-2.7.2.tar.gz

3、对hadoop目录进行重命名：

  mv hadoop-2.7.2 hadoop

4、配置hadoop相关环境变量

    vi ~/.bashrc 进入编辑器
    export HADOOP_HOME=/usr/local/hadoop --添加
    export PATH=$HADOOP_HOME/bin:$HADOOP_HOME/sbin --追加
    保存后执行 
    source ~/.bashrc

5、创建/usr/local/hadoop/dfs,/usr/local/hadoop/dfs/name,/usr/local/hadoop/dfs/data目录

mkdir /usr/local/hadoop/dfs
mkdir /usr/local/hadoop/dfs/name
mkdir /usr/local/hadoop/dfs/data

6、创建tmp目录

mkdir /usr/local/hadoop/tmp

二、修改相关配置文件

文件位于/usr/local/hadoop/etc/hadoop目录下（修改使用vi）

cd /usr/local/hadoop/etc/hadoop

• core-site.xml
  
  fs.defaultFS
  hdfs://master:9000
  
  
  io.file.buffer.size
  131072
  
  
  hadoop.tmp.dir
  file:/usr/local/hadoop/tmp
  Abase for other temporary directories.
  
  

• hdfs-site.xml

    <configuration>  
    <property>  
        <name>fs.defaultFS</name>  
        <value>hdfs://master:9000</value>  
    </property>  
    <property>  
        <name>io.file.buffer.size</name>  
        <value>131072</value>  
    </property>  
    <property>  
        <name>hadoop.tmp.dir</name>  
        <value>file:/usr/local/hadoop/tmp</value>  
        <description>Abase for other temporary   directories.</description>  
    </property>  
    </configuration> 

• mapred-site.xml

配置该文件时需要将mapred-site.xml.template重命名为mapred-site.xml

 mv mapred-site.xml.template mapred-site.xml --重命名

   <configuration>
   <property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
  </property>
  <property>
    <name>mapreduce.jobhistory.address</name>
    <value>master:10020</value>
  </property>
  <property>
    <name>mapreduce.jobhistory.webapp.address</name>
    <value>master:19888</value>
  </property>
</configuration>

• yarn-site.xml

       <configuration>  
        <property>  
               <name>yarn.nodemanager.aux-services</name>  
               <value>mapreduce_shuffle</value>  
        </property>  
        <property>     
                <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>  
               <value>org.apache.hadoop.mapred.ShuffleHandler</value>  
        </property>  
        <property>  
               <name>yarn.resourcemanager.address</name>  
               <value>master:8032</value>  
       </property>  
       <property>  
               <name>yarn.resourcemanager.scheduler.address</name>  
               <value>master:8030</value>  
       </property>  
       <property>  
            <name>yarn.resourcemanager.resource-tracker.address</name>  
             <value>master:8031</value>  
      </property>  
      <property>  
              <name>yarn.resourcemanager.admin.address</name>  
               <value>master:8033</value>  
       </property>  
       <property>  
               <name>yarn.resourcemanager.webapp.address</name>  
               <value>master:8088</value>  
       </property>  
           <property>
                <name>yarn.resourcemanager.hostname</name>
                <value>192.168.1.151</value>
       </property>
</configuration>  

• slaves文件

    slave1
    slave2