hadoop-2.6.0为分布式安装

伪分布模式集群规划（单节点）
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- host - ip - soft - process -
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- single32 - 192.168.1.30 - jdk-6u32-linux-i586,hadoop-2.6.0 - NameNode、SecondaryNameNode、DataNode、ResourceManager、NodeManager、JobHistoryServer -
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一、修改主机名为single32
   vi /etc/sysconfig/network
       将HOSTNAME=localhost改为HOSTNAME=single32
   shift+zz

二、修改主机名与IP映射文件
   vi /etc/hosts
       添加192.168.1.30 single32
   shift+zz

三、关闭防火墙
   service iptables stop
   chkconfig iptables off
   chkconfig --list | grep iptables

四、配置ssh免密码登陆
   ssh-keygen -t rsa（三次回车）
   ssh-copy-id -i single32
   ssh single32
   exit

五、安装jdk
   cd /usr/local/
   ./jdk-6u32-linux-i586.bin
   mv jdk1.6.32 jdk
   vi /etc/profile
       export JAVA_HOME=/usr/local/jdk
       export PATH=.:$JAVA_HOME/bin:$PATH
   shift+zz

六、安装hadoop-2.6.0
   cd /usr/local/
   tar -zxvf hadoop-2.6.0.tar.gz
   mv hadoop-2.6.0 hadoop
   vi /etc/profile
       export JAVA_HOME=/usr/local/jdk
       export HADOOP_HOME=/usr/local/hadoop
       export PATH=.:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$JAVA_HOME/bin:$PATH
   shift+zz

七、修改hadoop/etc/hadoop下的配置文件（hadoop-env.sh、core-site.xml、hdfs-site.xml、yarn-site.xml、mapred-site.xml）
hadoop-env.sh
export JAVA_HOME=/usr/local/jdk

core-site.xml
       <configuration>
           <property>
               <name>fs.defaultFS</name>
               <value>hdfs://single32:9000</value>
           </property>
           <property>
               <name>hadoop.tmp.dir</name>
               <value>/usr/local/hadoop/tmp</value>
           </property>
           <property>
               <name>fs.trash.interval</name>
               <value>1440</value>
           </property>
       </configuration>

hdfs-site.xml
       <configuration>
           <property>
               <name>dfs.replication</name>
               <value>1</value>
           </property>
           <property>
               <name>dfs.permissions</name>
               <value>false</value>
           </property>
       </configuration>

yarn-site.xml
       <configuration>
           <property>
               <name>yarn.nodemanager.aux-services</name>
               <value>mapreduce_shuffle</value>
           </property>
       </configuration>

   mapred-site.xml
       <configuration>
           <property>
               <name>mapreduce.framework.name</name>
               <value>yarn</value>
           </property>
       </configuration>

八、格式化hdfs（只能格式化一次）
   cd /usr/local/hadoop/bin
   hdfs namenode -format

九、启动hadoop
   cd /usr/local/hadoop/sbin
   启动hdfs
       start-dfs.sh
   启动yarn
       start-yarn.sh
   启动historyserver
       mr-jobhistory-daemon.sh start historyserver

十、验证启动状态
   1、命令行验证：（如下进程表示启动成功）
       [root@single32 sbin]# jps
       3691 SecondaryNameNode
       3991 NodeManager
       3420 NameNode
       4270 JobHistoryServer
       3831 ResourceManager
       3539 DataNode
       4307 Jps
   2、web验证：（打开表示启动成功）
       验证hdfs启动状态：http://single32:50070/
       验证yarn启动状态：http://single32:8088/
       验证启动状态：http://single32:19888/

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hadoop-2.6.0为分布式安装

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