---
- hosts: localhost
  gather_facts: false

  vars:
    - a_var: derp

  pre_tasks:
    - name: pretask
      debug: msg="a pre task"
      changed_when: true
      notify: say hi

  roles:
    - role: simple
      derp: newval

  tasks:
    - name: task
      debug: msg="a task"
      changed_when: true
      notify: say hi

  post_tasks:
    - name: posttask
      debug: msg="a post task"
      changed_when: true
      notify: say hi

Example Playbook Code

---
- name: Update web servers
  hosts: web

  tasks:
  - name: Install Apache in centos7
    ansible.builtin.yum:
      name: httpd
      state: latest
  - name: Copy index.html
    ansible.builtin.copy:
      src: index.html
      dest: /var/www/html/index.html
  - name: Starting a Apache Server
    ansible.builtin.service:
      name: httpd
      state: started

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Ansible Fundamental tutorial by Manish in 2020

Ansible Advance Tutorial for Beginners with Demo 2020 — By DevOpsSchool

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Ansible with network module (Part 02) — By DevOpsSchool

Ansible with network module (Part 03) — By DevOpsSchool

Ansible with network module (Part 04) — By DevOpsSchool

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Ansible with network module (Part 06) — By DevOpsSchool

Ansible with network module (Part 07) — By DevOpsSchool

Ansible with network module (Part 08) — By DevOpsSchool

Ansible with network module (Part 09) — By DevOpsSchool

Ansible with network module (Part 10) — By DevOpsSchool

Ansible with network module (Part 11) — By DevOpsSchool

Ansible with network module (Part 12) — By DevOpsSchool

Ansible with network module (Part 13) — By DevOpsSchool

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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