Introduction to Ansible in RHEL- RHCE.pdf
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Ansible is a free, open-source automation tool used for infrastructure as code, allowing system provision, configuration, and application deployment. It operates without agents, using simple YAML files for playbooks, which consist of ordered tasks utilizing modules. Key components include control nodes, managed nodes, and roles, all aimed at automating repetitive tasks efficiently and securely.
Introduction to Ansible in RHEL- RHCE.pdf
- 2. Ansible ● Free automation tool that enables infrastructure as code ● Ansible Inc was purchased by Red Hat in 2015 ● Open-source and community driven ● Written in Python ● Used for ○ Provision system ○ Configure system ○ Deploy Apps ○ Manage system and Apps
- 3. Without Ansible : With Ansible :
- 4. Ansible Benefits ● Agentless and easy to use ● Automates repetitive tasks, saving time and reducing errors ● Flexible with simple, human-readable configuration files ● Secure with SSH-based operations ● Includes pre-built modules for diverse tasks ● Supports orchestration for systems, networks, storage, and cloud
- 5. Ansible Architecture Source : Ansible Architecture - Detailed Explanation - InterviewBit
- 6. Key Terminologies ● Control Node or Ansible Server : Manages and executes Ansible automation across managed nodes ● Inventory : Organized list of managed nodes in Ansible ● Managed node : A remote system, or host, that Ansible controls Source : Getting started with Ansible — Ansible Community Documentation
- 7. Source : Ansible Playbooks-javatpoint
- 8. ● Modules : Command meant to be executed on the client-side Examples of modules - 1. Install http 2. Enable http service 3. Start http service ● Task : Single action executed on managed nodes, such as installing a package etc. It can have multiple modules ● Play : Group of ordered tasks executed collectively ● Playbook : Automation files containing one or more plays detailing the sequential execution of tasks
- 9. ● A Task in Ansible uses a Module ● Multiple Modules for related Tasks form a Play ● Plays together make a Playbook ● Playbooks are written in YAML format
- 10. Ansible Roles ● Package various automation components together ● Components including tasks, handlers, variables, plugins, templates, and files ● Can be reused across different plays or playbooks ● Enable sharing and collaboration among automation users ● Stored at /etc/ansible/roles
- 11. Ansible Configuration Files ● /etc/ansible : Default directory ● /etc/ansible/ansible.cfg: Main configuration file for Ansible settings ● /etc/ansible/hosts: Lists managed nodes and their details ● /etc/ansible/roles/: Directory for organizing reusable playbook components.
- 12. ansible.cfg common parameters that can be defined in config file
- 13. Install Ansible ● Install ansible on rhel 9 Command : dnf install-y ansible-core Documentation-Installing Ansible — Ansible Community Documentation
- 14. ● Check ansible version and verify installation Command : ansible–version
- 15. YAML File Syntax
- 16. YAML File Syntax ● All tasks are executed in sequential order ● Each task is processed one at a time ● Indentation is extremely important ● No <tabs> only use spaces in yaml ● Empty lines have no value ● File extension is usually .yml or .yaml ● No difference in double quotes or NO quotes for a task name ● There is NO need to modify the file permission
- 17. Create First Playbook ● Make ‘playbooks’ dir in /etc/ansible and create ‘myfirstplaybook.yml’ Name of playbook Where to run Name of task Run ping module Declare task Start yml file
- 18. ● Check syntax of playbook Command : ansible-playbook--syntax-check /etc/ansible/playbook/myfirstplaybook.yml
- 19. ● Dry run the playbook before execution Command : ansible-playbook-check /etc/ansible/playbook/myfirstplaybook.yml
- 20. ● Run the playbook Command : ansible-playbook /etc/ansible/playbook/myfirstplaybook.yml
- 21. Ansible Modules Link : All modules — Ansible Documentation