ubuntn14.04--hadoop环境配置

设置ssh免密码登陆
    执行命令    (1)ssh-keygen -t rsa
                        (2)cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

安装jdk
    执行命令   

(1)cd /usr/local
(2)chmod u+x jdk-6u24-linux-i586.bin
(3)./jdk-6u24-linux-i586.bin
(4)mv jdk-1.6.0_24  jdk
(5)vi /etc/profile 增加内容如下:
        export JAVA_HOME=/usr/local/jdk
        export PATH=.:$JAVA_HOME/bin:$PATH

6)source /etc/profile

    验证:    java -version

安装hadoop    （下载地址     http://mirror.bit.edu.cn/apache/hadoop/common/）
    执行命令   

1)tar -zxvf hadoop-1.1.2.tar.gz
(2)mv hadoop-1.1.2 hadoop
(3)vi /etc/profile 增加内容如下:
        export JAVA_HOME=/usr/local/jdk
        export HADOOP_HOME=/usr/local/hadoop
        export PATH=.:$HADOOP_HOME/bin:$JAVA_HOME/bin:$PATH
(4)source /etc/profile
(5)修改conf目录下的配置文件hadoop-env.sh、core-site.xml、hdfs-site.xml、mapred-site.xml
(6)hadoop namenode -format
(7)start-all.sh

修改conf目录下的配置文件hadoop-env.sh、core-site.xml、hdfs-site.xml、mapred-site.xml

hadoop-env.sh

export JAVA_HOME=/usr/local/jdk

core-site.xml

<configuration>
  <property>
      <name>fs.default.name</name>
      <value>hdfs://lili:9000</value>
</property>
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/usr/local/hadoop/tmp</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>

mapred-site.xml

<configuration>
    <property>
        <name>mapred.job.tracker</name>
        <value>lili:9001</value>
    </property>
</configuration>