Table of Contents
- 1 Introduction
- 1.1 Question 1: What is “DevOps”?
- 1.2 Question 2: What are some of the most popular DevOps tools?
- 1.3 Question 3: What are the main differences from Agility?
- 1.4 Question 4: What’s Version control?
- 1.5 Question 5: What are the 4 key components of DevOps?
- 1.6 Question 6: What are the programming languages that are used in DevOps?
- 1.7 Question 7: How does AWS fit into DevOps?
- 1.8 Question 8: What is ‘Extreme Programming’?
- 1.9 Question 9: What is a ‘design pattern’?
- 1.10 Question 10: What is CBD’?
- 2 More In-depth DevOps Interview Questions
- 2.1 Question 1: Explain ‘branching’.
- 2.2 Question 2: How to copy Jenkins to another server?
- 2.3 Question 3: Name three methods that you’d use to secure Jenkins.
- 2.4 Question 4: Describe ‘automation testing’.
- 2.5 Question 5: What are the main benefits of using ‘automation testing’?
- 2.6 Question 6: What’s Memcached?
- 2.7 Question 7: If some data changes, how can you update Memcached?
- 2.8 Question 8: Why is the component of Continuous Testing so important for DevOps?
- 2.9 Question 9: Is Selenium a good testing tool?
- 2.10 Question 10: How can you maximize the efficiency of Continous Integration?
- 3 General Interview Tips
- 4 Conclusions
IntroductionWe’ll start off from the basic questions – the short and sweet ones. This is the type of questions you are most likely to receive in the beginning of your job interview. Basic DevOps interview questions don’t mean that they’re easy, though – they are just ones that usually don’t need to be explained or expanded upon with follow-ups.
Question 1: What is “DevOps”?Naturally, this is the very first question you’re bound to get asked. Your potential employers might even ask you to explain it in your own words. To put it very simply, DevOps is a philosophical method of shortening life cycles of system developments. The word itself is a combination of “development” and “operations”.
Question 2: What are some of the most popular DevOps tools?Git, Jenkins, Docker and Selenium are some of the more popular tools used in DevOps.
Question 3: What are the main differences from Agility?DevOps and Agility are often put together and against each other. It is very likely that one of your DevOps interview questions are going to be to compare and contrast the two. One of the main difference between the two is that while Agility is purely time-oriented, DevOps puts the same emphasis on both time and quality. This way, a high quality is ensured together with everything being delivered on time. Another big difference is that when it comes to feedback, Agility solemnly relies on the customers, while DevOps uses only self-monitoring. Both methods have legitimate arguments to back them up, but self-monitoring is still considered to be the better option. This is because it is seen as the more objective way of viewing potential issues. Moreover, faster reaction times can be achieved with self-monitoring rather than customer feedback.
Question 4: What’s Version control?People consider this to be one of the easier DevOps interview questions – it is a way to track all of the previous versions of specific files.
Question 5: What are the 4 key components of DevOps?Integration, testing, delivery and monitoring. All of these mentioned methods have the tag continuous attached to them – they don’t simply happen once or twice, rather, they are all ongoing processes.
Question 6: What are the programming languages that are used in DevOps?Primarily – Ruby, but Python can be used too.
Question 7: How does AWS fit into DevOps?
Question 8: What is ‘Extreme Programming’?Extreme Programming (more commonly known simply as XP) is a method of software development. XP’s main objective is customer satisfaction – all goals, resolutions and working methods are aimed towards this one goal. A lot of companies that use DevOps usually utilize XP, too.
Question 9: What is a ‘design pattern’?This is one of the many common terms that people who work with the DevOps model have to be familiar with. Because of this, it is very likely that you’ll get such DevOps engineer interview questions. To put it very simply, a design pattern is a solution to some sort of a problem that the developer comes across. These patterns help new developers to avoid possible problems and issues by, well… Showing possible patterns and solutions.
Question 10: What is CBD’?CBD, or Component-Based Development, is somewhat of a unique way to approach product development. With CBD, developers look for already existing, well-crafted and tested components to form a brand new and original product. This is done instead of the usual procedure, which is to craft a product from scratch.
More In-depth DevOps Interview QuestionsNow that you somewhat have the feel for the types of questions that you’ll be receiving during your job interview, we can start moving to more advanced DevOps interview questions. The “advanced” part here is that these questions usually require more of an in-depth answer, or there’s a follow-up.
Question 1: Explain ‘branching’.One of the more common DevOps coding interview questions – your explanation will show both your knowledge and experience from previous work that you have done. There are three main types of branching – task, feature and release branching. Task branching includes each task in different branches, with the task keys included in the branch names. Feature branching stores changes and modifications of a feature within a branch. When the work with the feature is said and done, the branch containing the feature is then combined (merged) with the master file. Finally, release branching lets you clone a branch so that when it’s released, you can still make changes to the clone.
Question 2: How to copy Jenkins to another server?
Question 3: Name three methods that you’d use to secure Jenkins.Out of all of the DevOps interview questions and answers that you could think of, this is one of those which offer you some leniency with your choice of responses. I can offer you some suggestions about the possible ways you could answer this question:
- Run periodic security audits.
- Configure a limit of access to the data stored at Jenkins.
- Make sure that the global security option is turned on.
Question 4: Describe ‘automation testing’.By default, manual systems are used to test the systems. This means that both a lot of human resources are required, and there’s more room for possible error. However, automation testing allows the implementation of automated processes that test systems for you.
Question 5: What are the main benefits of using ‘automation testing’?There are quite a few benefits for using automation testing in a workplace, so I’m just going to give you some examples of the most notable ones.
- As mentioned earlier, errors are less likely to occur.
- It saves both money and time.
- Allows performing huge tests that would otherwise take too much time.
Question 6: What’s Memcached?Memcached is an open-source memory object caching system. Memcached is mostly used to avoid repetitive SQL data fetching tasks that would take up a lot of time performing in a concurrent manner.
Question 7: If some data changes, how can you update Memcached?This is one of the hundreds likely DevOps engineer interview questions. Concrete topics like Memcached usually do have follow-up questions, so it’s a good idea to prepare for as many of them as you possibly can. There are two ways to update Memcache in such a scenario – either clear the cache after every update or reset the keys after an update has happened.
Question 8: Why is the component of Continuous Testing so important for DevOps?
Question 9: Is Selenium a good testing tool?Yes, actually, it is considered to be one of the better testing tools for DevOps-based operations. Selenium is open-source, can be used on different browsers, has awesome communities, supports the option of distributed testing and, last but not least, is completely free.
Question 10: How can you maximize the efficiency of Continous Integration?As you’ve probably noticed, this is a popular format for DevOps interview questions – the execution of the continuous processes is often a very important point for employers. There are a lot of things you could do to maximize efficiency when it comes to continuous integration. But just to name a few of the more well-known ones:
- Automate both the build and the deployment.
- Testing should be done in an exactly copied (cloned) environment in which the production processes are going to happen.
- Allow everyone to see the results of a build – this will enhance productivity and smoothen out the processes of communication.