DevOps Interview Questions And Answers
What might you check If a Linux-manufacture server all of a sudden begins getting moderate?
In the event that a Linux-manufacture server all of a sudden begins getting moderate, you will check for following three things
What is DevOps?
It 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.
Name the popular scripting language of DevOps?
Discuss your experience building bridges between IT Ops, QA and development?
DevOps is all about effective communication and collaboration. I’ve been able to deal with production issues from the development and operations sides, effectively straddling the two worlds. I’m less interested in finding blame or playing the hero than I am with ensuring that all of the moving parts come together.
What types of testing are needed?
Software teams will often look for the “fair weather” path to system completion; that is, they start from an assumption that software will usually work and only occasionally fail. I believe to practice defensive programming in a pragmatic way, which often means assuming that the code will fail and planning for those failures. I try to incorporate unit test strategy, use of test harnesses, early load testing; network simulation, A/B and multivariate testing etc.
Which scripting languages do you think are most important for a DevOps engineer?
As far as scripting languages go, the simpler the better. In fact, the language itself isn’t as important as understanding design patterns and development paradigms such as procedural, object-oriented, or functional programming.
How do you expect you would be required to multitask as a DevOps professional?
Focus attention on bridging communication gaps between Development and Operations teams.
Understand system design from an architect’s perspective, software development from a developer’s perspective, operations and infrastructure from the perspective of a seasoned Systems Administrator.
Execute – to be able to actually do what needs to be done.
What testing is necessary to ensure that a new service is ready for production?
DevOps is all about continuous testing throughout the process, starting with development through to production. Everyone shares the testing responsibility. This ensures that developers are delivering code that doesn’t have any errors and is of high quality, and it also helps everyone leverage their time most effectively.
What’s a PTR in DNS?
Pointer records are used to map a network interface (IP) to a hostname. These are primarily used for reverse DNS. Reverse DNS is setup very similar to how normal (forward) DNS is setup. When you delegate the DNS forward, the owner of the domain tells the registrar to let your domain use specific name servers.
Describe two-factor authentication?
Two-factor authentication is a security process in which the user provides two means of identification from separate categories of credentials; one is typically a physical token, such as a card, and the other is typically something memorized, such as a security code.
What other tools might help you in this role?
DevOps is so diverse and inclusive that it rarely ends with coding, testing and systems. A DevOps project might rely on database platforms like SQL training Hyderabad or NoSQL, data structure servers like Redis, or configuration and management issue tracking systems like Redmine. Web applications are popular for modern enterprises, making a background with Web servers, like Microsoft Internet Information Services, Apache Tomcat or other Web servers, beneficial. Make sure to bring across that you are familiar with Agile application lifecycle management techniques and tools.
Which are the top DevOps tools? Which tools have you worked on?
The most popular DevOps tools are mentioned below:
- 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
You can also mention any other tool if you want, but make sure you include the above tools in your answer.
The second part of the answer has two possibilities:
If you have experience with all the above tools then you can say that I have worked on all these tools for developing good quality software and deploying those softwares easily, frequently, and reliably.
If you have experience only with some of the above tools then mention those tools and say that I have specialization in these tools and have an overview about the rest of the tools.
How do all these tools work together?
Given below is a generic logical flow where everything gets automated for seamless delivery. However, this flow may vary from organization to organization as per the requirement.
- Developers develop the code and this source code is managed by Version Control System tools like Git etc.
- Developers send this code to the Git repository and any changes made in the code is committed to this Repository.
- Jenkins pulls this code from the repository using the Git plugin and build it using tools like Ant or Maven.
- Configuration management tools like puppet deploys & provisions testing environment and then Jenkins releases this code on the test environment on which testing is done using tools like selenium.
- Once the code is tested, Jenkins send it for deployment on the production server (even production server is provisioned & maintained by tools like puppet). After deployment, It is continuously monitored by tools like Nagios. Docker containers provide a testing environment to test the build features.