Kubernetes interview questions

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Kubernetes interview questions

Prepare better for your Application developer interview with the top Kubernetes interview questions curated by our experts. The following list of interview questions on Kubernetes covers the conceptual questions for freshers and experts and helps you answer different questions like the difference between config map and secret, ways to monitor that a Pod is always running, ways to test a manifest without actually executing it.

Get well prepared with these interview questions and answers for Kubernetes. What is the difference between config map and secret? Differentiate the answers as with examples. Config maps ideally stores application configuration in a plain text format whereas Secrets store sensitive data like password in an encrypted format. Both config maps and secrets can be used as volume and mounted inside a pod through a pod definition file.

When a node is tainted, the pods don't get scheduled by default, however, if we have to still schedule a pod to a tainted node we can start applying tolerations to the pod spec. The mapping between persistentVolume and persistentVolumeClaim is always one to one.

Kubernetes Interview Questions - Kubernetes Interview Questions And Answers - Simplilearn

Even When you delete the claim, PersistentVolume still remains as we set persistentVolumeReclaimPolicy is set to Retain and It will not be reused by any other claims. Below is the spec to create the Persistent Volume.

What kind of object do you create, when your dashboard like application, queries the Kubernetes API to get some data? You should be creating serviceAccount. A service account creates a token and tokens are stored inside a secret object. By default Kubernetes automatically mounts the default service account.

However, we can disable this property by setting automountServiceAccountToken: false in our spec. Also, note each namespace will have a service account. A Pod always ensure that a container is running whereas the Job ensures that the pods run to its completion. Job is to do a finite task. By default Deployment in Kubernetes using RollingUpdate as a strategy.

Let's say we have an example that creates a deployment in Kubernetes. From the above, we can notice that one more replica set was added and then the other replica set was brought down.

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This is ideal in many scenarios where the container is running but somehow the application inside a container crashes. A pod spec which runs the main container and a helper container that does some utility work, but that is not necessarily needed for the main container to work.

The adapter container will inspect the contents of the app's file, does some kind of restructuring and reformat it, and write the correctly formatted output to the location. It connects containers with the outside world. It is a proxy that allows other containers to connect to a port on localhost. The only difference between replication controllers and replica sets is the selectors.

14 Kubernetes interview questions: For hiring managers and job seekers

Replication controllers don't have selectors in their spec and also note that replication controllers are obsolete now in the latest version of Kubernetes.As Kubernetes adoption grows, so does the need for IT pros with the skills and experience needed to run it in production. Signs suggest that demand for Kubernetes skills is pointing skyward.

That creates a tricky proposition for IT executives and hiring managers. The trickier part can be discerning between someone with deep production experience of the sort that requires months if not years of hands-on work and someone who has simply done a lot of reading and tinkering, especially given that Kubernetes v1. A [candidate] who can articulate many of the core concepts of Kubernetes and who also has intimate experience with the technology is going to be far ahead of their peers.

But it underlines the importance of understanding what you need and using that to inform your recruiting and screening process, and especially to ask the right interview questions. Someone with real-world experience will be able to pick up new concepts with ease. We asked Shemesh, Jones, and OpsRamp senior director of cloud management Xin Wang — all of whom have Kubernetes hiring experience — to recommend a range of good interview questions and prompts.

Shemesh advises starting with the basics — which could even include the most basic of questions, particularly in a preliminary phone screen: What is Kubernetes?

Fumbling that one might be a sign of a faker. Wang from OpsRamp offers examples:. Be prepared to describe how to build a node using tools like Minikube. If you want to fatten your list of capability-related questions, Shemesh from Jackpocket offers this list:.

There are some key differences between running Kubernetes in a test or dev environment and doing so in production. Looking for projects to keep your kids busy this summer - and teach them some tech at the same time? How about programming a tank and building a Raspberry Pi device? IT teams have had to take on new responsibilities and skills to rise to the challenges of the pandemic.

Here's how to encourage continuous learning without exhausting your team. What are some key workflows or processes that can be automated with Kubernetes?

Experts share six examples. Skip to main content. Kubernetes job interview questions: How to prepare.A recent nationwide U. This is all to say: IT leaders and recruiters are looking for Kubernetes skills across a significant range of technical roles and titles.

Kubernetes interview questions should gauge problem-solving skills.

Kubernetes Interview Questions: 5 to Help Get Hired in 2020

But the interview process will be particularly important when looking for Kubernetes skills because the technology is still relatively young. But finding experienced candidates is not always a given, so you may need to cast a wider net and consider people with an interest and aptitude for learning on the job.

In either scenario, Manville recommends a couple of starter questions to get going. You can, of course, mix up your preferred order or cherry-pick and adapt as you see fit. What are the benefits and challenges?

Here are several of his recommended questions when considering folks with some experience, but who are still learning. Question 5, in particular, speaks to the need for Kubernetes pros with a knack for troubleshooting and problem-solving, critical abilities beyond mastering the nuts and bolts of the platform itself. The fact that Kubernetes is rapidly evolving requires an interest in ongoing learning, even for people with deeper hands-on experience.

Top 20 Kubernetes Interview Questions & Answers You Need To Know in 2020

Would they throw up their hands, or embrace the shifting environment? This question helps an interviewer understand how candidates approach these issues. Kubernetes ecosystems provide a huge and growing number of resources from which to learn new skills.

Developers need to be comfortable with taking failure in stride, learning from sources that are not exclusive to their company, and sharing best practices with the community at large. Keep an open mind! What if you need candidates with more depth of experience? Let's examine some questions to gauge that:. Looking for projects to keep your kids busy this summer - and teach them some tech at the same time?

How about programming a tank and building a Raspberry Pi device? IT teams have had to take on new responsibilities and skills to rise to the challenges of the pandemic.

Here's how to encourage continuous learning without exhausting your team. What are some key workflows or processes that can be automated with Kubernetes? Experts share six examples. Skip to main content.

kubernetes interview questions

Filling Kubernetes jobs can be tricky because the technology is relatively young. Experts share interview questions to help hiring managers sort candidates — and help job seekers prepare.

By Kevin Casey March 27, Related content. Programmable tanks and Raspberry Pi: Try these kids tech projects. Kevin Casey writes about technology and business for a variety of publications.Kubernetes Interview Questions And Answers These Kubernetes questions will help you to crack your next Kubernetes job interview.

All the best for your future and happy learning. It groups containers that make up an application into logical units for easy management and discovery. Often, point-to-point integration may be used as the path of least resistance. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package. It supports Kubernetes natively and works on all Kubernetes setups, including our Deis Workflow setup.

It lets you put your environment and configuration into code and deploy it. This decouples infrastructure requirements from the application environment. A A node is an individual Linux host used to deploy and run your applications. Docker Cloud does not provide hosting services, so all of your applications, services, and containers run on your own hosts. Your hosts can come from several different sources, including physical servers, virtual machines or cloud providers. A A container cluster is a set of Compute Engine instances called nodes.

It also creates routes for the nodes, so that containers running on the nodes can communicate with each other. The Kubernetes API server does not run on your cluster nodes. A Kubelets run pods. The unit of execution that Kubernetes works with is the pod. A pod is a collection of containers that share some resources: they have a single IP, and can share volumes.

A Minikube is a tool that makes it easy to run Kubernetes locally.

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Minikube runs a single-node Kubernetes cluster inside a VM on your laptop for users looking to try out Kubernetes or develop with it day-to-day. This overview covers kubectl syntax, describes the command operations, and provides common examples.

For details about each command, including all the supported flags and subcommands, see the kubectl reference documentation. A Kubernetes, also sometimes called K8S K — eight characters — Sis an open source orchestration framework for containerized applications that was born from the Google data centers.

A Synopsis. The Kubernetes network proxy runs on each node. Service cluster ips and ports are currently found through Docker-links-compatible environment variables specifying ports opened by the service proxy. Kubernetes Interview Questions 22 Which process runs on Kubernetes master node?Jump to navigation.

Job interviews are hard for people on both sides of the table, but I've discovered that interviewing candidates for Kubernetes-related jobs has seemed especially hard lately. Why, you ask? For one thing, it's hard to find someone who can answer some of my questions.

Also, it has been hard to confirm whether they have the right experience, regardless of their answers to my questions. I'll skip over my musings on that topic and get to some questions that you should ask of any job candidate who would be working with Kubernetes.

I've always found this question to be one of the best ones to ask in interviews. I always hear, "I work with Kubernetes," but when I ask, "what is it? While he is not wrong, I'll give you a more detailed version. Kubernetes is a portable container orchestration tool that is used to automate the tasks of managing, monitoring, scaling, and deploying containerized applications.

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I've found that "an orchestration tool for deploying containerized applications" is probably as good as you're going to get as an answer, which in my opinion is good enough. While many believe Kubernetes adds a great deal more, overall, it offers many APIs to add to this core feature: container orchestration.

In my opinion, this is one of the best questions you can ask in an interview, as it at least proves whether the candidate knows what Kubernetes is. This question reveals a great first look at the complexity of Kubernetes. It shifts the conversation to an architectural overview and can lead to many interesting follow-up details. It has also been explained incorrectly to me an innumerable amount of times. More on Kubernetes What is Kubernetes? A node is the worker machine.

This machine can be a virtual machine VM or a physical machine, depending on whether you are running on a hypervisor or on bare metal. The node contains services to run containers, including the kubelet, kube-proxy, and container runtime.

All four of these details are important. For bonus points, an applicant could mention that, technically, a pod is the smallest deployable unit Kubernetes can create and manage—not a container. The best short answer I've received for this question is: "The node is the worker, and the pod is the thing the containers are in. Most of a Kubernetes administrator's job depends on knowing when to deploy what, and nodes can be very, very expensive, depending on where they are run.

I wouldn't want someone deploying nodes over and over when what they needed to do was deploy a bunch of pods. This question is one of my higher priority questions, but it may not be relevant for you and your team. In my organization, we don't use a graphical interface to manage our Kubernetes environments, which means command-line actions are all we do. So what is kubectl? It is the command-line interface to Kubernetes. You can get and set anything from there, from gathering logs and events to editing deployments and secrets.

It's always helpful to pop in a random question about how to use this tool to test the interviewee's familiarity with kubectl. How do you pronounce it? Well, that's up to you there's a big disagreement on the matterbut I will gladly point you to this great video presentation by my friend Waldo.

I haven't received an answer to this question on multiple interviews. I am not sure that namespaces are used as often in other environments as they are in the organization I work in.Kubernetes is the new powerful tool on the market in the devops realm. It is making waves in terms of its recent innovations.

Many companies have been created because of Kubernetes. Primarily in the devops realm but also some solutions in the on-prem territory. Kubernetes and its connection with Docker is providing the ability for engineers to service many servers and box setups in extremely easy ways. Kubernetes has created powerful bundles which has equipped ops engineers with everything they need to scale and service setups extremely easily.

Below is a list of the best Kubernetes interview questions and answers I could come up with. They are for both beginner and advanced ops engineers. As with all interview questions its important that you treat these as mock answers. You'll need to go through the questions and present your own answers, especially when in a technical interview session.

Kubernetes Interview Questions And Answers 2020

Most commonly, you will be pair programming with another ops engineer. So these questions will be helpful for you in the written or verbal part of the process. But you'll still need an extensive background with Kubernetes. Having personal projects you can use as examples of your experience can be very helpful. Define what Kubernetes is. What is its purpose? Could you please provide a definition of a Docker?

Give a description of Orchestration when it comes to software? How would you say that Kubernetes is related to Docker? What are the scenarios in which a Java Developer is going to use Docker? What are Daemon sets? Could you please describe Kubernetes minions.

What are labels and annotations when it comes to Kubernetes? What are the node server components for Kubernetes? Can you please tell me what the difference is between deploying applications on dedicated hosts versus on Kubernetes containers? Describe the meaning of a cluster in Kubernetes?Prepare better with the best interview questions and answers, and walk away with top interview tips.

These interview questions and answers will boost your core interview skills and help you perform better. Be smarter with every interview. The interviewer expects the candidate to be aware of why Kubernetes is HOT in the market and what problem does Kubernetes solve for all of us.

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One can begin the answer with. Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

It groups containers that make up an application into logical units for easy management and discovery. Kubernetes is a HUGE open source project with a lot of code and functionalities. The primary responsibility of Kubernetes is container orchestration.

kubernetes interview questions

That means making sure that all the containers that execute various workloads are scheduled to run physical or virtual machines. The containers must be packed efficiently following the constraints of the deployment environment and the cluster configuration.

In addition, Kubernetes must keep an eye on all running containers and replace dead, unresponsive, or otherwise unhealthy containers.

Said that Kubernetes is rightly a platform for managing application containers across multiple hosts. Same as the nature of containers, it's designed to run anywhere, so we're able to run it on a bare metal, in our data center, on the public cloud, or even hybrid cloud.

kubernetes interview questions

Kubernetes considers most of the operational needs for application containers. The Top 10 Reasons why Kubernetes is so popular are as follow:. This is a bit tricky question.

With the advent of microservice architecture, users to individually scale key functions of an application and handle millions of customers.

On top of this, technologies like Docker containers emerged in the enterprise, creating a consistent, portable, and easy way for users to quickly build these microservices. All you need is a robust orchestration platform which can manage those containers which host your entire application. Kubernetes comes to a rescue. Kubernetes is a robust orchestration platform which brings a number of features and which can be thought of as:.

Kubernetes provides a container-centric management environment. It orchestrates computing, networking, and storage infrastructure on behalf of user workloads. This provides much of the simplicity of Platform as a Service PaaS with the flexibility of Infrastructure as a Service IaaSand enables portability across infrastructure providers.

Below are the list of features which Kubernetes provides. This is one of the most important question ever asked in an interview.

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Though we compare Docker Vs Kubernetes, it is an apple-to-orange comparison. Reason - They are both fundamentally different technologies but they work very well together, and both facilitate the management and deployment of containers in a distributed architecture.

Slowly it grew massively with HUGE contributors across the world. Today it is a platform which is shipped as both - an open source as well as a commercial product. The orchestration is just a mere feature of Docker Enterprise Edition. But if we really want to study how K8s is related to Docker, then the most preferred answer would be.

Docker CLI provides the mechanism for managing the life cycle of the containers. Where as the docker image defines the build time framework of runtime containers.


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