Linux_hadoop_install

1、 Build Linux env

my env is VM RedHat Linux 6.5 64bit
    set fixed IP    
              vim /etc/sysconfig/network-scripts/ifcfg-eth0

set IP to : 192.168.38.128

modify hostname： vim /etc/hosts

set hostname to :  itbuilder1

2、install JDK

config JDK env variables

3、install Hadoop env

download Apache hadoop pkg

addr：http://archive.apache.org/dist/hadoop/core/stable2/hadoop-2.7.1.tar.gz

3.1  Extract the package to the specified directory

create a dir : mkdir /usr/local/hadoop

extract file to dir : /usr/local/hadoop ：tar -zxvf hadoop-2.7.1.tar.gz -C /usr/local/hadoop

3.2 Modify the configuration file

hadoop2.7.1 version need to modify 5 config files :

1、hadoop-env.sh

2、core-site.xml

3、hdfs-site.xml

4、mapred-site.xml（mapred-site.xml.template）

5、yarn-site.xml

these file all under etc of hadoop, the detail dir is : /usr/local/hadoop/hadoop-2.7.1/etc/hadoop/

3.2.1 Modfiy env variable (hadoop-env.sh)

vim hadoop-env.sh

set up JDK root directory, as shown below:

export JAVA_HOME=/usr/java/jdk1.8.0_20

3.2.2  core-site.xml ,set namenode and temp file addr of HDFS.

<configuration>
        <!--set HDFS addr (NameNode) -->
            <property> 
                    <name>fs.defaultFS</name>
                    <value>hdfs://itbuilder1:9000</value>
            </property>
        <!--set dir of Hadoop runtime file storage directory-->
            <property> 
                    <name>hadoop.tmp.dir</name>
                    <value>/usr/local/hadoop/hadoop-2.7.1/tmp</value>
            </property> 
      </configuration>

3.2.3 hdfs-site.xml (set duplicate quantity)

<configuration>
          <property> 
                <name>dfs.replication</name>
                <value>1</value>
            </property>
        </configuration>

3.2.4 mapred-site.xml  ( tell hadoop that later MR runs on yarn )

<configuration>
                <property>
                      <name>mapreduce.framework.name</name>
                        <value>yarn</value>
                  </property>
            </configuration>

3.2.5 yarn-site.xml

<configuration>
                  <!-- tell nodemanager the way to get data is shuffle -->
                  <property> 
                              <name>yarn.nodemanager.aux-services</name>
                                <value>mapreduce_shuffle</value>
                    </property>

<!--set yarn addr (ResourceManager) -->
                    <property>
                              <name>yarn.resourcemanager.hostname</name>
                                <value>itbuilder1</value>
                    </property>

</configuration>

4、add hadoop to env variable

vim /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_20
export HADOOP_HOME=/usr/local/hadoop/hadoop-2.7.1
export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin

#refresh /etc/profile
 source /etc/profile

5、Initialize (format) file system (HDFS)
    #hadoop namenode -format 
    hdfs namenode -format

6、start hadoop （hdfs yarn）
./start-all.sh (need to input linux password)
./start-hdfs.sh
./start-yarn.sh

View the current process of opening by JPs command

[root@linuxidc ~]# jps
3461 ResourceManager
3142 DataNode
3751 NodeManager
3016 NameNode
5034 Jps
3307 SecondaryNameNode

Access the management interface :
http://192.168.38.128:50070 (hdfs management interface)
http://192.168.38.128:8088 (mr management interface)