5. Yaml file

YAML and Ansible Playbook

YAML is a simple markup language that can be used to represent structured data. (Yet Another Markup Language)

It is easy readable.
Structured data is represented by indentation.
It is easy to understand and maintain.
Space character is used to represent the indentation.
We do not use tab for indentation.
There are libraries available in most programming languages for working with YAML.
Each item in the Ansible list is a list of key/value pairs, commonly called a “hash” or a “dictionary”.

Ansible Playbook

A playbook is basically a plan for defining and orchestrating tasks to be executed on managed nodes. It allows you to automate repetitive tasks, authorize system arrangements, and manage infrastructure efficiently.

Simple YAML File for Webserver

---
  - name: install httpd
    hosts: node2
    tasks:
    - name: install httpd
      yum: name=httpd
    - name: enable apache
      service: name=httpd state=true state=started
    - name: content
      copy:
        content: "welcome to webserver"
        dest: /var/www/html/index.html
        mode: "0644"
    - name: open firewall port
      firewalld:
        service: httpd
        permanent: yes
        state: enabled

---
  - name: install httpd
    hosts: node2
    tasks:
    - name: install httpd
      yum: name=httpd
    - name: enable apache
      service: name=httpd state=true state=started
    - name: content
      copy:
        content: "welcome to webserver"
        dest: /var/www/html/index.html
        mode: "0644"
    - name: open firewall port
      firewalld:
        service: httpd
        permanent: yes
        state: enabled