Configure hadoop cluster using ansible

In this post, i have created automation using ansible.I have created a playbook for configure hadoop cluster

Hadoop: Hadoop is an opensource software , which is used to manage Big data . Hadoop works master-slave cluster.

In hadoop cluster Name node and Data node are avilable , Data node share storage power to name node.

For learn more about ansible got to https://firsttalk26.medium.com/ansible-and-use-case-solved-using-ansible-1d90b18fafea

First of all need to configure ansible controller node and target node cluster. For this go to https://firsttalk26.medium.com/configure-docker-and-launch-container-using-ansible-93c8b708d20a

After configure ansible need to create playbook

Ansible Playbook:

- hosts: namenode
  tasks:
  - copy:
     src: "jdk-8u171-linux-x64.rpm"
     dest: "/root/"
  - copy:
      src: "hadoop-1.2.1-1.x86_64.rpm"
      dest: "/root/"
  - shell: java -version 2>&1 | grep version | awk '{print $3}' | sed 's/"//g'
    register: java_version
  - command: "rpm -ivh jdk-8u171-linux-x64.rpm"
    when: java_version.stdout != "1.8.0_171"
  - command: "hadoop version"
    register: hadoop_version
  - command: "rpm -ivh hadoop-1.2.1-1.x86_64.rpm"
    when:  hadoop_version.stdout_lines[0] != "Hadoop 1.2.1"
  - template:
      src: "name_node/core-site.xml.j2"
      dest: "/etc/hadoop/core-site.xml"
  - template:
      src: "name_node/hdfs-site.xml.j2"
      dest: "/etc/hadoop/hdfs-site.xml"
  - command: "ls -l /nn"
    register: folder_status
    ignore_errors: yes
  - file:
      path: "/nn"
      state: directory
    when: folder_status.rc != 0
  - command: "ls -l /nn/current/VERSION"
    register: version_status
    ignore_errors: yes
  - shell: "echo Y | hadoop namenode -format"
    when: version_status.rc != 0
  - shell: "jps | grep NameNode"
    register: namenode_status
    ignore_errors: yes
  - command: "hadoop-daemon.sh start namenode"
    when: namenode_status.rc != 0
 
- hosts: datanode
  tasks:
  - copy:
     src: "jdk-8u171-linux-x64.rpm"
     dest: "/root/"
  - copy:
      src: "hadoop-1.2.1-1.x86_64.rpm"
      dest: "/root/"
  - shell: java -version 2>&1 | grep version | awk '{print $3}' | sed 's/"//g'
    register: java_version
  - command: "rpm -ivh jdk-8u171-linux-x64.rpm"
    when: java_version.stdout != "1.8.0_171"
  - command: "hadoop version"
    register: hadoop_version
    ignore_errors: yes
  - debug:
      var: hadoop_version
  - command: "rpm -ivh hadoop-1.2.1-1.x86_64.rpm --force"
    when:  hadoop_version.rc != 0
  - template:
      src: "data_node/core-site.xml.j2"
      dest: "/etc/hadoop/core-site.xml"
  - template:
      src: "data_node/hdfs-site.xml.j2"
      dest: "/etc/hadoop/hdfs-site.xml"
  - command: "ls -l /dn"
    register: folder_status
    ignore_errors: yes
  - file:
      path: "/dn"
      state: directory
    when: folder_status.rc != 0
  - shell: "jps | grep DataNode"
    register: datanode_status
    ignore_errors: yes
  - command: "hadoop-daemon.sh start datanode"
    when: datanode_status.rc != 0

For configure namenode some file is used use below github repository for get full code for configure hadoop using ansible

https://github.com/firsttalk26/task11.git

After creating playbook run below command for do task in target node

ansible-playbook hadoop.yml