Hadoop2.2.0单节点伪分布式搭建

安装SSH

$ ssh-keygen -t dsa –P '' -f ~/.ssh/id_dsa
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

验证是否安装成功：

$ ssh –version$ ssh localhost

Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-23-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

Last login: Mon Feb 17 00:59:20 2014 from localhost.localdomain

安装 JDK(这里安装jdk1.7.0_45)

参考我的博客，链接如下：
http://blog.csdn.net/stanely_hwang/article/details/18883599

安装Hadoop

1.目录配置

在格式化前必须先建立好相应的目录，并赋予相应操作权限。

/home/hadoop	用户目录
/opt/hadoop/hadoop-2.2.0	软件home
/opt/hadoop/dfs/name	数据和编辑文件
/opt/hadoop/mapred/local	存放数据
/opt/hadoop/mapred/system	存放数据

 
创建完后,执行

$ sudo chmod –R a+w /opt/hadoop
获得目录权限
解压Hadoop tar.gz 压缩包到～/目录下

$ cd ~/ 

$ sudo  tar  –zxvf   hadoop-2.2.0.tar.gz

2.修改hadoop参数文件

以下所有配置文件的修改均在下面目录完成:
$  pwd
~/hadoop-2.2.0/etc/hadoop

编辑配置文件 

core-site.xml

$ vi core-site.xml

<configuration>
        <property>
            <name>fs.default.name</name>
            <value>hdfs://localhost:8020</value>
            <description>The name of the defaultfile system. Either the literal string "local" or a host:port forNDFS.
            </description>
            <final>true</final>
        </property>
</configuration>

编辑配置文件 

hdfs-site.xm

$ vi hdfs-site.xml

<configuration>         <property>                   <name>dfs.namenode.name.dir</name>                   <value>file:/opt/hadoop/dfs/name</value>                   <description>Determineswhere on the local filesystem the DFS name node should store the name table. Ifthis is a comma-delimited list of directories then the name table is replicatedin all of the directories, for redundancy. </description>                   <final>true</final>         </property>         <property>                   <name>dfs.datanode.data.dir</name>                   <value>file:/opt/hadoop/dfs/data</value>                   <description>Determineswhere on the local filesystem an DFS data node should store its blocks. If thisis a comma-delimited list of directories, then data will be stored in all nameddirectories, typically on different devices.Directories that do not exist areignored.                   </description>                   <final>true</final>         </property>         <property>                   <name>dfs.replication</name>                   <value>1</value>         </property>         <property>               <name>dfs.permissions</name>                <value>false</value>         </property></configuration>

编辑配置文件 

mapred-site.xml

$ vi mapred-site.xml

<configuration>         <property>                <name>mapreduce.framework.name</name>                <value>yarn</value>         </property>         <property>                   <name>mapred.system.dir</name>                   <value>file:/opt/hadoop/mapred/system</value>                   <final>true</final>         </property>         <property>                <name>mapred.local.dir</name>                <value>file:/opt/hadoop/mapred/local</value>                <final>true</final>         </property></configuration>

编辑配置文件 

yarn-site.xml

<configuration> <property> <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name> <value>mapreduce_shuffle</value>   <description>shuffle service that needsto be set for Map Reduce to run </description>  </property> </configuration>

编辑配置文件 

hadoop-env.sh

$ vi hadoop-env.sh

在hadoop-env.sh脚本文件中添加$JAVA_HOME,这里我将JDK安装在~/opt/jdk1.7文件下

export JAVA_HOME=~/opt/jdk1.7

启动hadoop

1.格式化namenode

到Hadoop安装目录的bin目录下执行（例如~/hadoop-2.2.0/bin目录下）

 $ ./hdfs namenode –format

2.开启守护进程

到Hadoop安装目录的sbin目录下执行（例如~/hadoop-2.2.0/sbin目录下）
 $  ./hadoop-daemon.sh start namenode

 $ ./hadoop-daemon.sh start datanode

3.开启yarn守护进程

到Hadoop安装目录的sbin目录下执行（例如～/hadoop-2.2.0/sbin目录下）

 $ ./yarn-daemon.sh start resourcemanager

 $ ./yarn-daemon.sh start nodemanager

4.检查进程是否启动

 $  jps

2912 NameNode
5499 ResourceManager
2981 DataNode
6671 Jps
6641 NodeManager
6473 SecondaryNameNode

5.查看hadoop管理页面

 http://localhost:8088
查看Namenode情况