I have been learning from this book Fabio Alessandro Locati, published under Packt>.

There is one simple exercise where there is an example of “Configuring a basic server”. The codes can be found

Enabling EPEL

To enable EPEL, in RHEL/CentOS 7, just install the epel-release package

--- 
- hosts: all 
  remote_user: ansible
  tasks: 
    - name: Ensure EPEL is enabled 
      yum: 
        name: epel-release 
        state: present 
      become: True 
    

Python bindings for SELINUX

Ansible is written in python, and mainly use the Python bindings to operate on the operating system.

--- 
- hosts: all 
  remote_user: ansible
  tasks: 
     - name: Ensure libselinux-python is present 
      yum: 
        name: libselinux-python  
        state: present 
      become: True 
    - name: Ensure libsemanage-python is present 
      yum: 
        name: libsemanage-python 
        state: present 
      become: True 

Firewall Settings

--- 
- hosts: all 
  remote_user: ansible
  tasks: 
    - name: Ensure FirewallD is running 
      service: 
        name: firewalld 
        state: started 
        enabled: True 
      become: True 
    - name: Ensure SSH can pass the firewall 
      firewalld: 
        service: ssh 
        state: enabled 
        permanent: True 
        immediate: True 
      become: True