Variables & Facts

name: nginx

name: "{{ package_name }}"

---
- name: Variables example
  hosts: all
  become: true
 
  vars:
    package_name: nginx
 
  tasks:
    - name: Install package
      apt:
        name: "{{ package_name }}"
        state: present

vim playbooks/variables.yml
ansible-playbook playbooks/variables.yml

# inventory.ini
[web]
web1 ansible_host=10.0.1.10 app_port=8080
 
[web:vars]
env=prod

- debug:
    msg: "App on {{ inventory_hostname }} port {{ app_port }} ({{ env }})"

ansible-playbook playbooks/extra-vars.yml -e "package=git"

vars:
  package: nginx   # default; -e overrides

ansible all -m setup
ansible all -m setup -a "filter=ansible_distribution"

- name: Show host info
  debug:
    msg: "{{ ansible_hostname }} / {{ ansible_default_ipv4.address }}"

- name: Install nginx on Ubuntu
  apt:
    name: nginx
    state: present
  when: ansible_distribution == "Ubuntu"

---
- name: Dynamic site
  hosts: all
  become: true
 
  tasks:
    - name: Install nginx
      apt:
        name: nginx
        state: present
 
    - name: Start nginx
      service:
        name: nginx
        state: started
        enabled: true
 
    - name: Create dynamic webpage
      copy:
        dest: /var/www/html/index.html
        content: |
          <h1>Welcome to DevOps</h1>
          <h2>Hostname: {{ ansible_hostname }}</h2>
          <h2>IP: {{ ansible_default_ipv4.address }}</h2>