Ansible Roles Tutorial

1. What is the use of roles in Ansible?
2. How do you write roles in Ansible?
3. What's the difference between Ansible playbook and roles?
4. How do you use handlers in Ansible roles?
5. What is Ansible structure?
6. What is Ansible task?
7. Where are Ansible roles stored?
8. How is a role name set?
9. How do I run Ansible locally?
10. What is Ansible Galaxy roles?
11. Why handlers are used in Ansible?
12. What is Idempotency in Ansible?
13. How do you call handlers in Ansible?

What is the use of roles in Ansible?

Roles provide a framework for fully independent, or interdependent collections of variables, tasks, files, templates, and modules. In Ansible, the role is the primary mechanism for breaking a playbook into multiple files. This simplifies writing complex playbooks, and it makes them easier to reuse.

How do you write roles in Ansible?

Create ansible role from scratch | Ansible roles example

1. Step 1: Create ansible role - motd.
2. Step 2: Create ansible tasks.
3. Step 3: Create ansible template.
4. Step 4: Create ansible variables.
5. Step 5 : Remove unwanted directories (Optional)
6. Step 6: Create ansible role playbook.
7. Step 7: Deploy ansible playbook roles.
8. Step 8: Verification.

What's the difference between Ansible playbook and roles?

Ansible playbook is a script file which contains all the tasks that need to be performed along with all the ingredients required to perform these tasks. Roles are ways of automatically certain var files, tasks, and handlers based on the known file structure.

How do you use handlers in Ansible roles?

Ansible 2.0

We used -s to tell Ansible to use sudo, -u to login as ubuntu user, and then pass the Playbook file. We can add a notify directive to the installation Task. This notifies any Handler named "Start Nginx" after the Task is run. Then we can create the Handler called "Start Nginx".

What is Ansible structure?

Ansible is a radically simple IT automation engine that automates cloud provisioning, configuration management, application deployment, intra-service orchestration, and many other IT needs.

What is Ansible task?

An Ansible® playbook is a blueprint of automation tasks—which are complex IT actions executed with limited or no human involvement. Ansible playbooks are executed on a set, group, or classification of hosts, which together make up an Ansible inventory.

Where are Ansible roles stored?

By default, Ansible looks for roles in two locations: in a directory called roles/ , relative to the playbook file. in /etc/ansible/roles.

How is a role name set?

Role Names

0, the role import process would alter the GitHub repository name to create the role name. ... To override the default name, set the role_name attribute in the role meta/main. yml file. The following snippet from a meta/main.

How do I run Ansible locally?

How to Run Ansible Playbook Locally

1. Method1: Specify Localhost in your hosts directive of your playbook.
2. Method2: Using local_action clause in the ansible playbook.
3. Method3: Add an entry in your Inventory.
4. Method4: Specify in the Ansible Command line. Why –limit is important here in method3.

What is Ansible Galaxy roles?

Ansible Galaxy is a repository for Ansible Roles that are available to drop directly into your Playbooks to streamline your automation projects. ... It is easy to get up and running with Ansible. Even a new sysadmin could start automating with Ansible in a matter of a few hours. Ansible automates using the SSH protocol.

Why handlers are used in Ansible?

Sometimes you want a task to run only when a change is made on a machine. For example, you may want to restart a service if a task updates the configuration of that service, but not if the configuration is unchanged. Ansible uses handlers to address this use case. Handlers are tasks that only run when notified.

What is Idempotency in Ansible?

When a playbook is executed to configure a system, the system should always have the same, well defined state. By its nature, Ansible tasks will only change the system if there is something to do. ... Most Ansible modules provide this idempotency.

How do you call handlers in Ansible?

Ansible provides several options for forcing handlers:

To force handlers that have been notified at a specific point within a playbook, you can use a meta task https://docs.ansible.com/playbooks_intro.html: tasks: shell: some tasks go here. meta: flush_handlers.