Orchestration Tool Ansible

Posted By : Baldev Pal | 25-Feb-2021

 

What is Ansible

 

Ansible: Ansible an open-source IT configuration Management, Deployment and Orchestration Tool. They provide large productivity gains with a wide Variety of Automation Challenges.

 

Ansible History:

 

  • Michael Dehaan has developed an Ansible and the project was began in February 2012.

  • Redhat acquired the ansible tool in 2015.

  • Ansible is available for RHEL, Debian, Centos, Oracle, Linux.

 

Advantages:

 

  • Ansible is free to use by everyone.

  • It is very consistent, lightweight, constraints regarding the OS or underlying hardware are present.

  • It is very secure due to its agentless capabilities and open SSH security features.

  • Ansible does not need any special system administrator skill to install and use it.

  • Push Mechanism.

 

Disadvantages:

 

  • Insufficient user interface though ansible tower is GUI, it is still in development stages.

  • Cannot achieve full automation by ansible.

  • New to file market, therefore, limited support and document is available

 

Terms used in Ansible:

 

Ansible server: The machine where Ansible is installed and from which all task and playbook will be run.

 

Module: It is a set of similar command mean to be executed for the client-side.

 

Task: It is a section that consists of a single procedure to be completed.

 

Role: A way of organising tasks and related files to be later called in a playbook.

 

Fact: Information fetched from the client system from the global variables with the gather-facts operation.

 

Inventory: File containing data about the ansible client servers.

 

PlayExecution of a playbook.

 

Handler: It is called only if a notifier is present.

 

Notifier: It is a Section attributed to a task which calls a handler if the output is changed.

 

PlaybooksIt consists of code in YAML format, which describes tasks to be executed.

 

Host: Nodes, which are automated by Ansible.

 

Ansible Modules:

 

  • The ships with a number of modules that will be executed directly on remote hosts or through the playbook.

  • The module of library will be reside on any machine, and there are not server daemons, or databases required.

 

Ansible Playbook:

 

  • Playbook in ansible are written in YAML format.

  • It is human readable data serialization language. It is commonly used for configuration files.

  • Playbook is like a file where you write codes consist of vars, tasks, handlers, files, templates and roles.

  • Each playbook is composed of one or more ‘modules’ in a list Module is a colllection of configuration files.

  • Playbook are dvided into many section like-

 

Target Section: Define the host against which playbook task has to be executed.

 

Variable Section:Define variables.

 

Task Section:List of all modules that we need to run in an order.

 

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