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Hadoop 2.x伪分布式环境搭建步骤：
1、修改hadoop-env.sh、yarn-env.sh、mapred-env.sh
方法：使用notepad++(beifeng用户)代开这三个文件
添加代码：export JAVA_HOME=/opt/modules/jdk1.7.0_67
2、修改core-site.xml、hdfs-site.xml、yarn-site.xml、mapred-site.xml配置文件
1）修改core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://Hadoop-senior02.beifeng.com:8020</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/opt/modules/hadoop-2.5.0/data</value>
</property>
</configuration>
2）修改hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.http-address</name>
<value>Hadoop-senior02.beifeng.com:50070</value>
</property>
</configuration>
3）修改yarn-site.xml
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.hostname</name>
<value>Hadoop-senior02.beifeng.com</value>
</property>
<property>
<name>yarn.log-aggregation-enable</name>
<value>true</value>
</property>
<property>
<name>yarn.log-aggregation.retain-seconds</name>
<value>86400</value>
</property>
</configuration>
4）修改mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>0.0.0.0:19888</value>
</property>
</configuration>
3、启动hdfs
1）格式化namenode:$ bin/hdfs namenode -format
2）启动namenode:$sbin/hadoop-daemon.sh start namenode
3）启动datanode:$sbin/hadoop-daemon.sh start datanode
4）hdfs监控web页面：http://hadoop-senior02.beifeng.com:50070
4、启动yarn
1）启动resourcemanager:$sbin/yarn-daemon.sh start resourcemanager
2）启动nodemanager:sbin/yarn-daemon.sh start nodemanager
3）yarn监控web页面：http://hadoop-senior02.beifeng.com:8088
5、测试wordcount jar包
1）定位路径：/opt/modules/hadoop-2.5.0
2）代码测试：
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原文地址：http://www.cnblogs.com/really0612/p/5469443.html
