Ansible is a configuration management, application deployment, and infrastructure orchestration open source automation platform. For DevOps engineers and system administrators, it’s a popular automation tool. System administrators sometimes experience burnout as a result of long hours and repeated work across several systems, but Ansible makes these duties easier to do.

Ansible can be used to perform tasks such as user creation, service administration, and software installation. Ansible is procedural rather than declarative, which means you write all of the required steps
in a YAML file and then run them sequentially on all target systems.

Roles

Complex task playbooks can get quite long, making them difficult to read and comprehend. Ansible roles are the answer to this problem. Long playbooks can be broken down into many files using roles, making each playbook easy to read and comprehend. Templates, files, variables, modules, and tasks make up a role. The primary goal of roles is to allow Ansible code to be reused.

DevOps engineers and sysadmins should aim to reuse their code whenever possible. Multiple playbooks can be stored in an Ansible role. If the role is appropriate for a given scenario, it can readily reuse code created by anyone. For example, develop a playbook for Apache hosting and then reuse the code by modifying the text of index.html to change parameters for another application or service.

The following tree command displays the directory structure of the user.example role

[user@host roles]$ tree user.example
user.example/
├── defaults
│
└── main.yml
├── files
├── handlers
│
└── main.yml
├── meta
│
└── main.yml
├── README.md
├── tasks
│
└── main.yml
├── templates
├── tests
│
├── inventory
│
└── test.yml
└── vars
└── main.yml

Using the ansible-galaxy command, all files are created empty at first. So, depending on the task, various folders can be used. Variables, for example, are stored in the vars directory. The primary playbook is main.yml, which can be found in the tasks directory. The templates directory is where Jinja templates are kept. The handlers directory is where handlers are kept.

Advantages of Ansible roles:

• Allow for content reusability
• Make large projects manageable

Ansible roles are structured directories containing sub-directories.

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Author: STEPS