DevOps Classroom Series – 26/Dec/2020

Solving the Scenario

  • Exercise: Now try Writing an ansible playbook for install tomcat8 on ubuntu and centos
  • Solution:
  • We have configured 3 ansible nodes
    • 2 centos server with python 2.7
    • 1 ubuntu server with python 3.7
  • All the machines have a user ‘ansible’ configured for password less authentication
  • So first lets verify inventory Refer Here
  • We have ran ansible ping adhoc command Preview
  • ansible has predefined inventory parameters which can change ansible behavior for a node or group of nodes
    • ansible_host: This is DNS name
    • ansible_port: port for ssh (default will be 22)
    • ansible_user: Specifies the username that ansible will connect to node with
    • ansible_ssh_private_key_file: SSH private key file used to connect to node
    • ansible_python_interpreter: used to set manual path of python on node
    • ansible_become
    • ansible_become_method
    • ansible_sudo_pass
    • ansible_become_password
    • ansible_connection
    • ansible_shell_type
    • ansible_shell_executable
    • ansible_ssh_pass
  • Refer Here
  • To find some details about nodes we can use the setup module Refer Here
  • We can combine facts with ansible conditionals for conditional execution Refer Here
  • Refer Here for the changeset Preview
  • Now lets try to create a user as mentioned below
sudo useradd -m -U -d /opt/tomcat -s /bin/false tomcat
  • Refer Here for the changeset
  • Refer Here for the draft playbook with 3 steps of ubuntu automated
  • Refer Here for the draft playbook with 3 steps for centos automated
  • Exercise:
    • Correct the failures in playbook execution
    • Try creating only one playbook which does this 3 steps automation in centos and ubuntu
    • Observe the behavior of your playbook when it is executed multiple times

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