Patches_and_installation1.txt

Patches and installation.

Story by Janathan Lozada De La Matta.

So we’ve learned how to update a system, restart the 
VM, reconnect, and install a RPM. 

  - name: update the system
    yum:
      name: "*"
      state: latest

In the first line, we give the task a meaningful name so we 
know what Ansible is doing. In the next line, the yum module 
updates the CentOS virtual machine (VM), then name: "*" 
tells yum to update everything, and, finally, state: latest 
updates to the latest RPM.

After updating the system, we need to restart and re-
connect:

  - name: restart system to reboot to newest kernel
    shell: "sleep 5 && reboot"
    async: 1
    poll: 0

  - name: wait for 10 seconds
    pause:
      seconds: 10

  - name: wait for the system to reboot
    wait_for_connection:
      connect_timeout: 20
      sleep: 5
      delay: 5
      timeout: 60

  - name: install epel-release
    yum:
      name: epel-release
      state: latest

The shell module puts the system to sleep for 5 seconds 
then reboots. We use sleep to prevent the connection from 
breaking, async to avoid timeout, and poll to fire & forget. 

We pause for 10 seconds to wait for the Vm to come back 
and use wait_for_connection to connect back to the Vm 
as soon as it can make a connection. 

Then we install epel-release to test the RPM installation. You can run this 
playbook  multiple  times  to  show  the  idempotent, and the 
only task that will show as changed is the reboot since we 
are using the shell  module.  You  can  use  changed_when: 
False to ignore the change when using the shell module if 
you expect no actual changes.