RAGE UDAY KIRAN

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Chapter 1: Installation of Ubuntu, Creation of Users, and Enabling Direct Remote Login

  1. Select k machines and install ubuntu each of them. Check ubuntu installation.

  2. Assign an ipaddress to each machine.

    sudo nano /etc/netplan/01-network-manager-all.yaml

#copy and paste the below text

network:
  ethernets:
    ens18:
      addresses:
      - <specify_ip_address> #163.143.165.138/24
      nameservers:
        addresses:
        - <specify_name server> #163.143.1.100
        search: []
      routes:
      - to: default
        via: <specify_router> #163.143.165.1
version: 2

Save the file and exit (press Control + X, and Y). Next, type the following command on the terminal:

sudo netplan apply

  1. In every machine, create a sudo user with same the username.

    sudo useradd -m -s /bin/bash -G sudo hadoop

sudo passwd hadoop

  2. Login into every machine and create public and private keys.

    ssh-keygen -t rsa

#press enter key for simplicity

  3. Among k machines, select a machine as a master node. Consider the remaining machines as slave nodes. Note down the ipaddresses of master and slave machines. Please ensure that the machine representing the master node has high specs (CPU and RAM) to do processing.

    Example: 163.143.165.138 - master 163.143.165.139 - slave1 … # one can have any number of slaves

  4. In every machine, enter the ipaddress and hostname of every machine.

    sudo vi /etc/hosts

#add these sentences at the begining
163.143.165.138 master  
163.143.165.139 slave1

    Note: Please do not simply type master and slave1. Using ‘hostname’ check the name of the machine and type it.

  5. Copy the public ssh key from the master machine to all slave machines.

    ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@163.143.165.139
...

chmod 0600 ~/.ssh/authorized_keys

  6. From each slave machine, copy its public ssh to master machine.

     ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@163.143.165.139
 ...
 chmod 0600 ~/.ssh/authorized_keys

  7. Open the following ports by executing below commands in the terminal

     sudo ufw allow 9000
 sudo ufw allow 9001 
 sudo ufw allow 9870  #name node webui
 sudo ufw allow 8088  #resource node webui
 sudo ufw allow 19888 #mapreduce job history webui
 sudo ufw allow ssh

sudo ufw enable  
# press 'Y' when asked

Chapter 2: Installation of Java

Perform the below steps on every machine irrespective of master or slave.

  1. Install the latest version of Java JDK.

     sudo apt install openjdk-17-jdk -y

  2. In the .bashrc file, add java details to Java_home and path variables.

        nano .bashrc
 
    # enter the following text at the end of the file

     export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
     export PATH=$PATH:$JAVA_HOME/bin

Save the file and exit (press Control + X, and Y). Next, type the following commands on the terminal:

source .bashrc   #ensure no errors were generated
javac   #You should able see the commands that you can execute.

Chapter 3: Downloading, Unzipping, and Moving Hadoop folder to a common location

Perform the below steps on every machine irrespective of master or slave.

  1. Download the latest version of Hadoop system into your home directory.

    wget https://dlcdn.apache.org/hadoop/common/hadoop-3.4.0/hadoop-3.4.0.tar.gz

  2. Unzip the file.

    tar -zxvf hadoop-3.4.0.tar.gz

  3. Move the unzip folder into a common directory where other users can also access it. Rename the folder to “hadoop” to maintain consistency.

    mv hadoop-3.4.0 /opt/hadoop

  4. In the .bashrc file, upload the PATH variable and add other Hadoop variables.

    nano .bashrc

export PATH=$PATH:$JAVA_HOME/bin:/opt/hadoop/bin:/opt/hadoop/sbin
export HADOOP_OPTS=-Djava.net.preferIPv4Stack=true
export HADOOP_CONF_DIR=/opt/hadoop/etc/hadoop

Save the file and exit (press Control + X, and Y).

Chapter 4: Configuring the Hadoop directory

Chapter 4.1: Login into Master node and perform the below-mentioned steps.

  1. Enter into Hadoop directory

    sudo cd /opt/hadoop

  2. Open the core-site.xml file that exists in the /opt/hadoop/etc/hadoop folder.

    nano /opt/hadoop/etc/hadoop/core-site.html

  3. Copy and paste the below provided code.

      <configuration>
     <property> 
      <name>fs.default.name</name> 
      <value>hdfs://hadoop-master:9000/</value> 
     </property> 
     <property> 
       <name>dfs.permissions</name> 
       <value>false</value> 
     </property> 
  </configuration> Save the file and exit (press Control + X, and Y).

  4. Open the hdfs-site.xml file that exists in the /opt/hadoop/etc/hadoop folder and copy-paste the below provided text.

     <configuration>
   <property> 
      <name>dfs.data.dir</name> 
      <value>/opt/hadoop/hadoop/dfs/name/data</value>
      <final>true</final> 
   </property> 
   <property> 
      <name>dfs.name.dir</name> 
      <value>/opt/hadoop/hadoop/dfs/name</value> 
      <final>true</final> 
   </property> 
   <property> 
      <name>dfs.replication</name> 
      <value>1</value> 
   </property> 
 </configuration>

Save the file and exit (press Control + X, and Y).

Note: You can specify the replication value to be 2, 3, or more to ensure fault-tolerant.

  1. Create the following directories to save the data and names.

    mkdir /opt/hadoop/hadoop/dfs/name
mkdir /opt/hadoop/hadoop/dfs/name/data

  2. Open mapred-site.xml file that exists in the /opt/hadoop/etc/hadoop folder and copy-paste the below provided text.

     <configuration>
   <property> 
      <name>mapred.job.tracker</name> 
      <value>hadoop-master:9001</value> 
   </property> 
 </configuration> Save the file and exit (press Control + X, and Y).

  3. Open hadoop-env.sh file that exists in the /opt/hadoop/etc/hadoop folder and copy-paste the below provided text.

    export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
export HADOOP_OPTS=-Djava.net.preferIPv4Stack=true
export HADOOP_CONF_DIR=/opt/hadoop/etc/hadoop
export PATH=$PATH:$JAVA_HOME/bin:/opt/hadoop/bin:/opt/hadoop/sbin

Save the file and exit (press Control + X, and Y).

Chapter 4.2: Setting up the slave nodes

Option 1: Login into every slave node and perform all the above-mentioned steps mentioned for the Master node.

Option 2: You can simply copy the hadoop directory from the master node to each of the slave node.

   scp -r hadoop hadoop@slave1:/opt/
   ...

Save the file and exit (press Control + X, and Y).

Chapter 4.3: Configuring the master node

  1. Specify the ipaddress of the master node

    nano /opt/hadoop/etc/hadoop/masters

master1 #or type the ipaddress of the master node Save the file and exit (press Control + X, and Y).

  2. Specify the ipaddresses of the slave nodes

    nano /opt/hadoop/etc/hadoop/slaves

slave1 #mention the ipaddress of slave nodes
slave2
...

Save the file and exit (press Control + X, and Y).

  1. Format the master node to store hadoop data.

    /opt/hadoop/bin/hadoop namenode –format
               or
/opt/hadoop/bin/hadoop namenode   (for latest versions)

  2. Start the Hadoop services

    /opt/hadoop/sbin/start-all.sh

  3. Check the process running in master and a worker machines by executing the following command on the terminal:

    jps

  4. Open the browser and check the HDFS using the following URL:

    http://ipAddressMasterNode:9870/

Examaple: http://163.143.165.138:9870/