安裝hadoop2.6.0僞分佈式環境

集羣環境搭建請見：http://blog.csdn.net/jediael_lu/article/details/45145767


1、環境準備
一、安裝linux、jdk
二、下載hadoop2.6.0，並解壓
三、配置免密碼ssh
（1）檢查是否能夠免密碼：  
$ ssh localhost
（2）若否：
$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

四、在/etc/profile中添加如下內容
#hadoop setting
export PATH=$PATH:/mnt/jediael/hadoop-2.6.0/bin:/mnt/jediael/hadoop-2.6.0/sbin
export HADOOP_HOME=/mnt/jediael/hadoop-2.6.0
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"

2、安裝hdfs
一、配置etc/hadoop/core-site.xml:
<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>
二、配置etc/hadoop/hdfs-site.xml:

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
</configuration>
三、格式化namenode
$ bin/hdfs namenode -format
四、啓動hdfs
$ sbin/start-dfs.sh
五、打開頁面驗證hdfs安裝成功
http://localhost:50070/
六、運行自帶示例
（1）建立目錄
  $ bin/hdfs dfs -mkdir /user
$ bin/hdfs dfs -mkdir /user/jediael
（2）複製文件
bin/hdfs dfs -put etc/hadoop input
（3）運行示例
$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0.jar grep input output 'dfs[a-z.]+’
（4）檢查輸出結果
$ bin/hdfs dfs -cat output/*
6       dfs.audit.logger
4       dfs.class
3       dfs.server.namenode.
2       dfs.period
2       dfs.audit.log.maxfilesize
2       dfs.audit.log.maxbackupindex
1       dfsmetrics.log
1       dfsadmin
1       dfs.servers
1       dfs.replication
1       dfs.file
（5）關閉hdfs
 $ sbin/stop-dfs.sh

3、安裝YARN
一、配置etc/hadoop/mapred-site.xml
<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
</configuration>
二、配置etc/hadoop/yarn-site.xml
<configuration>
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
</configuration>
三、啓動yarn
$ sbin/start-yarn.sh
四、打開頁面檢查yarn
 http://localhost:8088/
五、運行一個map-reduce job
$  bin/hadoop fs -mkdir /input
$ bin/hadoop fs -copyFromLocal /etc/profile /input
$ cd  /mnt/jediael/hadoop-2.6.0/share/hadoop/mapreduce
$ /mnt/jediael/hadoop-2.6.0/bin/hadoop jar hadoop-mapreduce-examples-2.6.0.jar wordcount /input /output
查看結果：
 $/mnt/jediael/hadoop-2.6.0/bin/hadoop fs -cat /output/*