Lesson 3 of 4By Simplilearn
Last updated on Oct 22, 202018245DevOps is attracting a lot of attention these days, which means anything associated with it also gets the spotlight, inviting increased interest and scrutiny. Ansible is a heavily favored DevOps tool, specifically in the realm of software automation. Consequently, it has a higher profile.
Since Ansible is increasing in popularity, it stands to reason that more businesses and organizations are looking for candidates who have experience using it. This elevated demand means there’s a higher likelihood of having Ansible-related questions thrown at you during an interview.
How do you prepare for this probability? The following list of the most frequently asked Ansible-related questions (and their answers), ranging in level from beginner to advanced, will help you get started.
Granted, reading an article about interview questions is no substitution for gaining actual knowledge and experience with Ansible, whether through classes or hands-on work. Still, it does serve as a good refresher. After all, there’s a lot to know. By reading this article, you can get an extra edge that may be a difference-maker in your next interview.
Also, keep in mind that this list is not exhaustive, but no worries; we’re focusing on the two dozen questions most likely to be asked.
Let us now begin by looking at some of the Ansible interview questions and answers for beginners.
It is an open-source platform that facilitates configuration management, task automation, or application deployment. It is a valuable DevOps tool. It was written in Python and powered by Red Hat. It uses SSH to deploy SSH without incurring any downtime.
Ansible has many strengths, including:
CD stands for continuous delivery, and CI stands for continuous integration; both are software development practices.
In CD, developers build software that can be released into production at any given time. CI, on the other hand, consists of each developer uploading regularly scheduled integrations (usually daily), resulting in multiple integrations every day. Ansible is an ideal tool for CI/CD processes, providing a stable infrastructure for provisioning the target environment and then deploying the application to it.
Ansible is broken down into two types of servers: controlling machines and nodes. Ansible is installed on the controlling computer, and the controlling machines manage the nodes via SSH.
The controlling machine contains an inventory file that holds the node system’s location. Ansible runs the playbook on the controlling machine to deploy the modules on the node systems. Since Ansible is agentless, there’s no need for a third-party tool to connect the nodes.
You need a virtual machine with Linux installed on it, running with Python version 2.6 or higher.
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A playbook has a series of YAML-based files that send commands to remote computers via scripts. Developers can configure entire complex environments by passing a script to the required systems rather than using individual commands to configure computers from the command line remotely. Playbooks are one of Ansible’s strongest selling points and often referred to as the tool’s building blocks.
You can use either the Python installer or a Linux-based installation process, such as apt or yum.
It’s an enterprise-level web-based solution that increases Ansible’s accessibility to other IT teams by including an easy to use UI (user interface). Tower’s primary function is to serve as the hub for all of an organization’s automation tasks, allowing users to monitor configurations and conduct rapid deployments.
Next, let us look at the intermediate level Ansible interview questions.
idempotency is an important Ansible feature. It prevents unnecessary changes in the managed hosts. With idempotency, you can execute one or more tasks on a server as many times as you need to, but it won’t change anything that’s already been modified and is working correctly. To put it in basic terms, the only changes added are the ones needed and not already in place.
This is a tool bundled with Ansible to create a base directory structure. Galaxy is a website that lets users find and share Ansible content. You can use this command to download roles from the website:
$ ansible-galaxy install username.role_name
To create an encrypted file, use the ‘ansible-vault create’ command.
$ ansible-vault create filename.yaml
You will get a prompt to create a password, and then to type it again for confirmation. You will now have access to a new file, where you can add and edit data.
Facts are newly discovered and known system variables, found in the playbooks, used mostly for implementing conditionals executions. Additionally, they gather ad-hoc system information.
You can get all the facts by using this command:
$ ansible all- m setup
It’s a playbook control module used to control a password prompt. It’s set to True by default.
Users initiate ad hoc commands to initiate actions on a host without using a playbook. Consider it a one-shot command.
A play is a set of tasks that run on one or more managed hosts. Plays consist of one or more tasks. A playbook consists of one or more plays.
Learn to create your own playbooks, manage an entire cloud region, and more with the Ansible Foundation Training Course. Click to enroll now!
Configuration management tools help keep a system running within the desired parameters. They help reduce deployment time and substantially reduce the effort required to perform repetitive tasks. Popular configuration management tools on the market today include Chef, Puppet, Salt, and of course, Ansible.
Finally, let us go through the Ansible interview questions at an advanced level.
When there’s an extensive playbook involved, sometimes it’s more expedient to run just a part of it as opposed to the entire thing. That’s what tags are for.
You can filter out tasks in one of two ways:
In Ansible, a handler is similar to a regular task in a playbook, but it will only run if a task alerts the handler. Handlers are automatically loaded by roles/<role_name>/handlers/main.yaml. Handlers will run once, after all of the tasks are completed in a particular play.
There are three testing methods available:
Upgrading Ansible is easy. Just use this command: sudo pip install ansible==<version-number>
One of Ansible’s most basic rules is: “Always use {{ }} except when:”
You can access the controlling machine’s existing variables by using the “env” lookup plugin. For instance, to access the value of the management machine’s home environment variable, you’d enter:
local_home:”{{lookup(‘env’,’HOME’)}}”
If you want to keep secret data but still be able to share it publicly, then use Vault in playbooks. But if you’re using –v (verbose) mode and don’t want anyone to see the results, then use:
name: secret task
shell: /usr/bin/do_something --value={{ secret_value }}
no_log: True
Now that you have looked at the various Ansible interview questions from the beginner to the advanced level, check out What is Ansible? To learn more about this versatile tool. The next step is to learn how to become a trained, certified Ansible expert, and Simplilearn has you covered.
The Ansible Foundation Training Course gives you everything you need to know to become an expert. With just a little more than four hours of self-paced learning, you can gain valuable skills needed to start a rewarding career in DevOps. This course, coupled with the above interview information, puts you at the head of the pack!
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