Ansible

Ansible	Puppet
Push Mechanism	Pull Mechanism
Agentless	Master
Uses YAML Language	Use Puppet Language
User-Friendly	Not User-Friendly

Additional Features:

• Python-based: Ansible is built using Python, leveraging its robustness and wide community support.

• Ansible Galaxy: A repository where users can find and share Ansible roles, simplifying automation tasks.

• Protocol Support: Supports SSH for Linux and

  WinRM for Windows, ensuring versatile connectivity across different platforms.

Configure the Ansible Configuration File

Set the default private key in Ansible’s configuration file (ansible.cfg):

[defaults]
inventory = ~/ansible/hosts
host_key_checking = False
private_key_file = ~/.ssh/ansible_key
remote_user = ubuntu

• In order to avoid mentioning private key while running ansible-book

Ansible Ad Hoc Commands

Inventory:

• An inventory file lists remote server IPs and groups them for organizational purposes.

• Example: inventory
  

  [webserver]
  789.455.45.5
  
  [dbserver]
  75.658.48.3
  

Example Command:

• Execute a shell command across all servers in the inventory:
  

  ansible -i <inventory or hosts (mention path if NOT default)> all -m shell -a "sudo devopsclass"
  

  • -m: Modules used for specific tasks.
  • -a: Arguments passed to modules.

Ansible Playbook

Example first-playbook.yml:

---
- name: Install Nginx
  hosts: all
  become: true

  tasks:
    - name: Install Nginx
      apt:
        name: nginx
        state: present

    - name: Start Nginx
      service:
        name: nginx
        state: started

Running first-playbook.yml:

• Execute the playbook against servers listed in the inventory:
  

  ansible-playbook -i <inventory or hosts (mention path if NOT default)> first-playbook.yml
  

  OR

• If private key & other parameter not configured in ansible.cfg
  

   ansible-playbook -i ~/ansible/hosts --private-key=~/.ssh/ansible_key playbook.yml
  

Verbose Mode:

• Use -v or -vvv for increasing verbosity, aiding in understanding tasks executed by Ansible.

Ansible Galaxy

Overview:

• It's a command-line tool and online repository where you can search for roles developed by other users, contribute your own roles.

Roles in Ansible:

• Ansible Roles are a way of organizing your Ansible tasks, handlers, variables, and other configurations in a reusable and structured manner.

Example Role Initialization:

ansible-galaxy role init kubernetes

Directories and Files Created:

• defaults/main.yml: Default variables.

• files/: Static files for distribution.

• handlers/main.yml: Handlers triggered by tasks.

• meta/main.yml: Role metadata including dependencies.

• tasks/main.yml: Main list of tasks.

• templates/: Jinja2 templates directory.

• tests/: Testing directory.

• vars/: Additional variables.

• README.md: Role documentation and usage guidelines.

Feel free to share and spread the knowledge! 🌟😊 Enjoy Learning! 😊