Top 45 DevOps Interview Questions And Answers

Question 1

Are you more _Dev_ or _Ops_?

Accepted Answer

What the interview means is do you do more sysadmin work, or do you spend a lot of time working with developers on coding?

Question 2

Explain what is DevOps ?

Accepted Answer

**DevOps** is a newly emerging term in IT field, which is nothing but a practice that emphasizes the collaboration and communication of both software developers and other information-technology (IT) professionals. It focuses on delivering software product faster and lowering the failure rate of releases.

Question 3

What is Kubernetes? Why organizations are using it?

Accepted Answer

**Kubernetes** is an open-source system for automating deployment, scaling, and management of containerized applications. To understand what Kubernetes is good for, let's look at some examples: * You would like to run a certain application in a container on multiple different locations. Sure, if it's 2-3 servers/locations, you can do it by yourself but it can be challenging to scale it up to additional multiple location.
* Performing updates and changes across hundreds of containers
* Handle cases where the current load requires to scale up (or down)

Question 4

What is the most important thing DevOps helps us achieve?

Accepted Answer

The most important thing that DevOps helps us achieve is to get the changes into production as quickly as possible while minimising risks in software quality assurance and compliance. This is the primary objective of DevOps.

Question 5

What is meant by _Continuous Integration_?

Accepted Answer

*Continuous Integration (CI)* is a development practice that requires developers to integrate code into a shared repository several times a day. Each check-in is then verified by an automated build, allowing teams to detect problems early.

Question 6

What is the need for DevOps?

Accepted Answer

Nowadays instead of releasing big sets of features, companies are trying to see if small features can be transported to their customers through a series of release trains. This has many advantages like quick feedback from customers, better quality of software etc. which in turn leads to high customer satisfaction. To achieve this, companies are required to:

1.  Increase deployment frequency
2.  Lower failure rate of new releases
3.  Shortened lead time between fixes
4.  Faster mean time to recovery in the event of new release crashing

DevOps fulfills all these requirements and helps in achieving seamless software delivery.

Question 7

What does _Containerization_ mean?

Accepted Answer

*Containerisation* is a type of *virtualization* strategy that emerged as an alternative to traditional hypervisor-based virtualization.

In containerization, the operating system is shared by the different containers rather than cloned for each virtual machine. For example Docker provides a container virtualization platform that serves as a good alternative to hypervisor-based arrangements.

Question 8

Which are the top DevOps tools? Which tools have you worked on?

Accepted Answer

The most popular DevOps tools are:

*   **Git**: Version Control System tool
*   **Jenkins**: Continuous Integration tool
*   **Selenium**: Continuous Testing tool
*   **Puppet, Chef, Ansible**: Configuration Management and Deployment tools
*   **Nagios**: Continuous Monitoring tool
*   **Docker**: Containerization tool

Question 9

Why is _Continuous Monitoring_ necessary?

Accepted Answer

*Continuous Monitoring* allows timely identification of problems or weaknesses and quick corrective action that helps reduce expenses of an organization. Continuous monitoring provides solution that addresses three operational disciplines known as:

* continuous audit
* continuous controls monitoring
* continuous transaction inspection

Question 10

How is DevOps different from Agile/SDLC?

Accepted Answer

* Agile software development methodology focuses on the development of software.
* DevOps on the other hand is responsible for development as well as deployment of the software in the safest and most reliable way possible.

Top 45 DevOps Interview Questions

What is Kubernetes? Why organizations are using it?

Explain what is DevOps ?

What is meant by Continuous Integration?

What is the need for DevOps?

Are you more Dev or Ops?

What is the most important thing DevOps helps us achieve?

What is DevOps engineer's duty with regards to Agile development?

What's the next thing you would automate in your current workflow?

How is DevOps different from Agile/SDLC?

Why is Continuous Monitoring necessary?

What is post Mortem Meetings?

Can we consider DevOps as an Agile methodology?

How have you handled failed deployments?

What are the success factors for Continuous Integration?

What is the function of CI (Continuous Integration) server?

What is the role of a Configuration Management tool in DevOps?

Mention what are the key aspects or principle behind DevOps?

Which are the top DevOps tools? Which tools have you worked on?

What does Containerization mean?

What are the advantages of DevOps?

How would you assess how deployable a system is?

Which problems does a Container Orchestration solve?

What is the difference between Kubernetes and Docker?

How Do you update a live heavy traffic site with minimum or Zero Down Time?

How do all DevOps tools work together?

How would you prepare for a migration from one platform to another?

What is the difference between Resource Allocation and Resource Provisioning?

What are the differences between Continuous Integration, Continuous Delivery, and Continuous Deployment?

What do you know about Serverless model?

Classify Cloud Platforms by category

What's the difference between a Blue/Green Deployment and a Rolling Deployment?

If something breaks in production, how do you know about it?

How would you make key aspects of a software system traceable?

Explain a use case for Docker

What is Chef?

Tell me about the worst-run/best-run outage you’ve been a part of. What made it bad/well-run?

Explain Blue-Green deployment technique

How would you deploy software to 5000 nodes?

How is Container different from a Virtual Machine?

What is Vagrant and what is it used for?

What is Continuous Monitoring?

Why Continuous Integration is important for Agile?

How would you introduce Continuous Delivery in a successful, huge company for which the change from Waterfall to Continuous Delivery would be not trivial, because of the size and complexity of the business?

What is Canary Releasing?

Can you explain a relationship between container runtime and container orchestration?