DevOps Classroomnotes 21/Mar/2022

Activity 2: Lets install jdk 11 on Redhat 8 machine

  • Lets find the manual steps to install openjdk 11 on RedHat 8 Refer Here for documentation to install openjdk 11
  • Create a Redhat 8 virtual machine (in any cloud or hypervisor of your choice)
  • We have verified that the manual steps are working
sudo yum install java-11-openjdk -y
  • For the module for yum Refer Here
  • In our lab setup we dont have a redhat 8 node, so lets add the redhat8 node as node2
  • Now we need to copy the key from ansible control node to node2
  • Refer Here for the changes made
  • Now execute the playbook
  • For installing java on two distributions of linux, we have used two seperate playbooks and two seperate inventory files which is not a good idea.
  • So as approach 1, lets try to write both the tasks in the same file
  • When we execute the ansible playbook, we have observed one extra step running Gathering facts.
  • Ansible facts are data related to the remote node which include os, ip addresses, memory, network and many work…. Refer Here
  • The module in ansible which can collect information about the node is setup Refer Here.
  • Lets run some adhoc commands to fetch information
    • ubuntu instance (node1):
    • redhat instance (node2)
  • To to write conditional statements Refer Here
  • Refer Here for the changes done and execute the playbook
  • When executing ansible-playbook we can see the debug/log information by adding -v or -vv or -vvv, -vvvv
  • Exercise:
    • Can you make changes in your existing playbook to install node js to work on Redhat 8.

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