Hadoop Installation Overview – Part1 – Single Node

Hadoop Installation Overview – Single Node Part1

Overview

This is the part1 of Hadoop installation document, We will be covering installing hadoop on a Single VM enviroment.
Both namenode and datanode will run on the same VM.

Assumption

This document assumes that

Installation Steps

Step1

Install VMWare Workstation, as mentioned above

Step2

Install ubuntu , as mentioned above.
**Note – Make sure you select the 32bit or 64bit version based on your windows version

Step3

Install OS Updates for ubuntu.
Go to Terminal and type
$ sudo apt-get update

Step4

Install OpenJDK6. Since hadoop is all java we need the JDK.
$apt-get install openjdk-6-jdk

Step5

Install Eclipse.
From UI go to software center and install eclipse

Step6

Open SSH Server
sudo apt-get install openssh-server

Step7

download hadoop 1.2.1.tar.gz

Step 8

Go to terminal and 

    $ cp hadoop 1.2.1.tar.gz ~ #copy to home dir 
    $ tar-xvf hadoop 1.2.1.tar.gz

Step9

#Open .bashrc and make the following settings
export JAVA_HOME=/usr/lib/jvm/java-6-openjdk-amd64 #checkout the home is pointing to jdk
export HADOOP_PREFIX=/softwares/hadoop-1.2.1
export PATH = $PATH:$HADOOP_PREFIX/bin;

Step10 – CONFIGURATION FILES

Configuration Settings, go to conf folder of your hadoop installation
  • core-site.xml
      $sudo gedit core-site.xml
  <property>
      <name>fs-default.name</name>
      <value>localhost:8020</name>
  </property>
  • hdfs-site.xml
      $sudo gedit hdfs-site.xml
  <property>
      <name>dfs.replication</name>
      <value>1</value>
  </property>
  <property>
      <name>dfs.perimissions</name>
      <value>false</value>
  </property>
  • mapred-site.xml
      $sudo gedit mapred-site.xml
  <property>
      <name>mapred.job.tracker</name>
      <value>localhost:8021</value>
  </property>
  • /etc/hosts
    make the entry of the machines ipaddress in hosts file
    $ifconfig
    $sudo gedit /etc/hosts
    192.168.1.129 mynode1
    192.168.1.129 localhost

Step11 – FINAL STEP

Generate SSH Keys and pass public key to datanode.
    $ ssh-keygen
    $ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
    #note this step is needed, since we have datanote and namenode on the same machine,  namenode communcates with the datanote and for that on a single node installation authorized_keys is needed.

Step12 – RUN HADOOP AND VERIFY

With Step11, Installation is complete, lets run the hadoop
    $ hadoop namenode -format 
    #Note - This should format the hdfs partition. you should see successfully formatted message
    $ start-dfs.sh 
    #This will start the namenode and secondary namenode daemon
    $ start-mapred.sh
    #This will start the jobtracker and tasktracker daemon
    $ jps 
    #verify all the daemons are running, you see 5 process running, namenode, secondary namenode, jobtracker,tasktracker 


    YOUR HADOOP IS RUNNING NOW, If you see any challenges post in the comments below.

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