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Top 50 Kubernetes Interview Questions and Answers for 2020



Introduction

Kubernetes is one of the most critically acclaimed container orchestration tools that is a buzzword amongst tech professionals because it is easy to learn and has great deployment by smaller to bigger organizations like Google, Shopify, Slack, New York Times, Yahoo, eBay, etc.

50 Kubernetes Interview Questions and Answers for 2020

Kubernetes was open-sourced in 2014 by Google and ever since then, many companies have started adopting this tool to automate the deployment, scaling, and management of containerized applications in multiple environments. 

Companies use Kubernetes because:

  • It helps in breaking down the containers into smaller modules to ensure more granular management.
  • Has quite an improved infrastructure than other DevOps tools.
  • It makes it seamless to deploy software upgrades frequently.
  • Has the foundation for the cloud-native apps.

Despite the popularity of this tool, companies are still lacking skilled and certified Kubernetes professionals. In such an event, if you have honed this tool via Kubernetes Certification Training online and have a big interview lined up in coming weeks, here are the 50 Kubernetes interview questions and answers for 2020 divided based on 4 categories:

  • General Kubernetes Interview Questions
  • Architecture-Based Kubernetes Interview Questions and Answers
  • MCQ type top Kubernetes interview questions
  • Scenarios based interview questions on Kubernetes

Let’s get started with the top Kubernetes interview questions divided into the above categories, --- one by one!

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General Kubernetes Interview Questions

This category lists the questions that are asked related to the general working of Kubernetes during the interviews.

  1. The classic question --- What do you know about Kubernetes?

Kubernetes is a container orchestration tool that is used for automating container deployment, scaling/descaling, and load balancing in multiple environments. Being the prodigy of Google, the tool has excellent community support in the background and seamlessly supports the cloud-native applications. Kubernetes is not just a containerization platform, it is a multi-container management solution.

  1. How do you think Kubernetes is related to Docker?

It is known that the Docker image builds the runtime containers and these individual containers need to communicate with each other, which is why Kubernetes is used. So Docker builds the containers and the Kubernetes tool helps these containers communicate. The container running on multiple hosts can be easily linked and orchestrated by Kubernetes tools.

  1. What difference do you find between Docker Swarm and Kubernetes?

Docker Swarm and Kubernetes

Parameters

Kubernetes

Docker Swarm

GUI

Kubernetes Dashboard is the GUI

Has no GUI

Installation & cluster configuration

Setups are quite complicated but the cluster is robust.

Setup is easy but the cluster is not robust.

Auto-scaling

Can do auto-scaling.

Cannot do auto-scaling.

Scalability

Scales fast.

Scales 5 times faster than Kubernetes.

Load Balancing

Manual support needed for load balancing traffic between containers & pods.

Does auto load balancing of traffic between containers in clusters.

Data volumes

Can only share storage volumes with containers in the same pod.

Can share storage volumes with other containers.

Rolling updates and rollbacks

Does rolling updates and automatic rollbacks.

Can do rolling updates but no automatic rollbacks.

Logging and monitoring

Has in-built tools to perform logging and monitoring.

Requires 3rd party tools like ELK stack to do logging and monitoring.

  1. What do you understand by container orchestration?

Or 

How Container orchestration is beneficial?

orchestration is beneficial

Container orchestration is a process of managing the life cycles of containers more specifically in large & dynamic environments. All the services in the individual container are in synchronization to fulfill the needs of the server. Container orchestration is used to regulate and automate tasks such as:

  • Provisioning and deployment of containers
  • Upscaling or removing containers to divide application load evenly all across host infrastructure
  • Redundancy and availability of containers
  • Moving of containers from one host to another in case there is a shortage of resources in a host (or when the host dies)
  • Allocation resources across containers
  • Health monitoring of containers and hosts
  • Externally exposing services running in a container to the outside world
  • Load balancing of service discovery across containers
  • Configuring an application relative to the containers running it
  1. What difference do you find between deploying applications on the host and containers?

 deploying applications

When you deploy the application on hosts:

  • There will be an operating system and that operating system will have a kernel which again will have diverse libraries (installed on the operating system) that are required for the application.
  • In this kind of framework, you can have several applications and you will see all the applications sharing the libraries present in the operating system.

When you deploy an application on the container:

  • In this architecture, you will have a kernel which will be the only common thing between all the applications.
  • Here you will see every application has their necessary libraries and binaries isolated from the rest of the system, which cannot be approached by any other application.
  • Like if one app needs access to Python, that particular app will get it, if the particular application needs access to Java, then only that particular app will have access to Java.
  1. What are the highlighted features of Kubernetes?

Kubernetes have 4 top features:

  • Automated Scheduling - Kubernetes has an advanced scheduler that can load containers on cluster nodes.
  • Self-healing capacities - Can restart, reschedule, or replace containers that are dead.
  • Horizontal scaling and Load balancing - Kubernetes can scale and descale application as per requirements.
  • Automated rollouts and rollbacks - Can do automated rollbacks and rolling updates for the containerized applications.
  1. What are clusters in Kubernetes?

Kubernetes cluster is a set of nodes used for running containerized applications, so when you are running Kubernetes, you are running a cluster. A cluster contains a control plane & one or maybe more than one compute machines/nodes.

  • The control plane is used to maintain the desired state of the cluster, such as which applications are running or which container images they use.
  • Whereas, the nodes run the applications and the workloads.

Clusters are the heart of Kubernetes that gives the ability to schedule and run the containers across a group of machines - physical, virtual, on-premise, or in the cloud. Kubernetes containers aren’t tied to any particular machines, they are abstracted across the cluster.

  1. What do you know about Heapster?

Heapster is a performance monitoring & metrics collection system which is compatible with Kubernetes versions 1.0. 6 & above. It not just allows the collection of performance metrics regarding your workloads, containers, pods, but also collects events and other signals generated by the cluster.

  1. What is Google Container Engine?

Google Container Engine or GKE is an open-source cluster management and orchestration system that runs and maintains Docker containers and clusters. GKE helps to schedule the containers into a cluster and further automatically manages them based on desired requirements or stipulations.

  1. What is Kubectl?

Kubectl is the platform with which you can pass commands to the cluster. It provides the command-line interface to run commands to the Kubernetes cluster with multiple ways of creating & managing the Kubernetes component.

  1. What is Minikube?

Minikube is a tool used for easy running Kubernetes locally, it runs a single-code Kubernetes cluster within a virtual machine.

  1. What is Kubelet?

Kubelet is an agent service which runs on each node, it works on the description of containers given in the PodSpec and makes sure the described containers are running well.

  1.  How Kubernetes simplifies the containerized Deployment?

A cluster of containers of applications running across multiple hosts requires communications. To make the communication happen, we require something that can scale, balance, and monitor the containers. As Kubernetes is an anti-agnostic tool that can run on any public to a private provider, it is the best choice that can simplify the containerized deployment.

  1. What is the use of nodes in Kubernetes?

Node provides important services to run pods. Nods are also named as minions which depending on the cluster can run on any physical or virtual machine.

Node is the main worker machine in Kubernetes and master components manage every node in the system. 

  1. What are the two prime components of Kubernetes architecture?

The “master node” and the “worker node” completes the Kubernetes architecture. Both of them carry in-built multiple services within them. 

  • The master node has services like Kube-controller-manager, Kube-scheduler, ETCD, and Kube - apiserver.
  • The worker node has services like container runtime, Kubelet, and Kube-proxy.

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Architecture-Based Kubernetes Interview Questions and Answers

Now we will look into the questions that are related to the architecture of Kubernetes.

  1. What is Kube-proxy?

Kube-proxy is an important component of any Kubernetes deployment. It is an implementation of a network proxy and a load balancer and gives support to services abstraction along with other networking operations. Its job is to route traffic to the right container based on IP & the port number of the incoming request.

  1. What is the role of Kube-apiserver and Kube-scheduler?

Kube-  Episerver 

  • It follows the scale-out architecture & is the front-end of the master node control panel. 
  • Exposes all the APIs of the Kubernetes Master node components and establishes communication between the Kubernetes Node and the Kubernetes master components.

Kube-scheduler 

  • It does distribution and management of workload on the worker nodes. 
  • It opts the most suitable node to run the unscheduled pod (based on resource requirements) & keeps a track on the resource utilization. 
  • It makes sure that no workload is scheduled on already full nodes.
  1. How do master nodes in Kubernetes work?

  • Kubernetes master controls the nodes, and nodes have the containers in it.
  • The individual containers are contained inside the pods and each pod can contain various numbers of containers based on the requirements & configuration.
  • So when pods have to be deployed, they have to be deployed either using the interface or CLI (command line interface).
  • These pods are scheduled on the nodes and on the basis of resource requirements, the pods are allocated to these nodes.
  • Kube-apiserver (which is master node services) ensures that there is a communication between the Kubernetes node and master components.
  1. Can you explain about Kubernetes controller manager?

Different controller processes run on the master nodes which are compiled together to run as a single process which is “Kubernetes Controller Manager”. Kubernetes controller manager is a daemon that embeds the core control loops shipped with Kubernetes. A control loop is a non-terminating loop that controls the state of the system. 

In Kubernetes, a controller is a control loop that sees the shared state of the cluster via an api server and makes changes in an attempt to move the current state towards the desired state.

Controllers that ship with Kubernetes is the - replication controller, namespace controller, endpoints controller, and service accounts controller.

  1. What is ETCD in Kubernetes?

ETCD is an open-source distributed key-value store written in Go programming language which is used to hold and manage the important information which distributed systems need in order to keep running.

It manages the state data, configuration data, metadata for Kubernetes.

  1. What is a load balancer in Kubernetes?

balancer in Kubernetes

The load balancer in Kubernetes helps to efficiently distribute network traffic among diverse backend services, it is a critical strategy that maximizes scalability and availability. It routes requests to clusters to optimize performance and ensure the reliability of your application.

There are two kinds of the load balancer -  external load balancer and internal load balancer:

  • The internal Load Balancer automatically balances load and allocates the required configuration to the Pod.
  • The external Load Balancer routes the traffic from the external load to the backend pods.
  1. What is the Ingress network and how does it work?

balancer in Kubernetes

  • In Kubernetes, Ingress is an object that allows access to your Kubernetes services from outside the Kubernetes cluster. You can configure access by creating a collection of rules that define which inbound connections to reach which services. It lets you compile your routing rules into a single resource. 
  • Ingress networks as a collection of protocols act as an entry point to the Kubernetes cluster. It allows inbound connections, which can be configured to give services externally via load balance traffic, reachable URLs, or by offering name-based virtual hosting. 
  • So, Ingress is an API object that manages external access to the services in a cluster, usually by HTTP, and happens to be the most powerful way of exposing a service.

Let’s understand the working of the Ingress network with a detailed example:

  • Suppose there are 2 nodes with pod and root network namespaces with a Linux bridge.
  • And then you have flannel0 (network plugin), a new virtual ethernet device added to the root network.

Look at the following chart, suppose we want the packet to flow from pod1 to pod 4.

  • The packet leaves pod1’s network at eth0 and reaches the root network at veth0 (follow yellow arrows).
  • Then it passes to cbr0, which creates an ARP request to find the destination and it is discovered that nobody on this node has a destination IP address.
  • The bridge sends the packet to flannel0 (as the node’s route table is configured with flannel0).
  • The flannel daemon now communicates to the API server of Kubernetes to find about all the pod IPs and their nodes to create mappings for the pods IPs to node IPs.
  • Now the network plugin covers this packet in a User Datagram Protocol packet with extra headers (changing the source and destination IP’s to their nodes) and sends this packet out via eth0.
  • Now the routeing table knows how to route traffic between nodes, it sends the packet to the node2.
  • The packet now reaches eth0 of node2 and goes back to flannel0 to emit it back in the root network namespace.
  • The packet is then forwarded to the Linux bridge to make an ARP request for finding out the IP that belongs to veth1.
  • The packet crosses the root network for the final and reaches the required destination which is Pod4.
  1. What are the different types of services in Kubernetes?

We have four types of services in Kubernetes:

  • Cluster IP - Kubernetes Service is an abstraction defining a logical set of Pods running somewhere in your cluster, all providing the same functionality. When created, each Service is given a unique IP address which is also called clusterIP.
  • Node Port - A NodePort is an open port that is on every node of your cluster. Kubernetes routes incoming traffic transparently on the NodePort to your service, even if the application is running on a different node.
  • Load Balancer - It exposes the service externally using the load balancer of the cloud provider. Services to which the load balancer will route are automatically created.
  • External name - It exposes the Service by using an arbitrary name (specified by ExternalName in the spec) by returning a CNAME record with its value.
  1. What is Headless Service?

Headless Service is similar to ‘Normal’ services but doesn’t have any Cluster IP. It allows you to directly reach the pods without needing any proxy to reach them.

  1. What is Container resource monitoring?

Kubernetes factorizes the management of the cluster by curating the abstraction at different levels like pods, containers, services, and the whole cluster. Each level now can be monitored and this process is termed as Container resource monitoring.

  1. What do you understand about Cloud controller managers?

Cloud Controller Manager has to ensure consistent storage, abstract the cloud-specific code from the Kubernetes specific code, network routing, and manage the communication with the cloud services. 

All these can be split into different containers (it depends on which cloud platform you are using) and this further allows the Kubernetes and cloud vendors code to get developed without creating any inter-dependency. So, the cloud vendor develops its code and connects with the cloud-controller-manager while running the Kubernetes.

There are 4 types of cloud controller managers:

  • Node controller - Ensures that the node is deleted as soon it is stopped.
  • Volume controller - Manages the storage and interacts with the cloud provider to orchestrate volume.
  • Route Controller - Manages traffic routes in the underlying cloud infrastructures.
  • Service Controller - It ensures the management of cloud provider load balancers.
  1. What is the difference between a replica set and a replication controller?

Both replica set and replication controller ensure that the given number of pod replicas are running at a given time. But the only point of difference between them is, replica leverages set-based selectors, while the replication controller uses equity-based controllers.

Selector-based Selectors

Equity-Based Selectors

It filters the keys according to a set of values. The selector based selector locks for pods whose label is mentioned in the set.

 

Like if you have a label key that says app in (Nginx, NPS, Apache), if you have an app equal to any of these nginx, NPS, or Apache, the selector will declare it as True.

It filters by both label keys and values. The equity-based selector looks for the pods that have the exact phrase as mentioned in the label.

 

Like if you have a key, app=nginx, this selector will look for the pods with a label as app equal nginx.

13. What are federated clusters?

The Multiple Kubernetes clusters can be controlled/managed as a single cluster with the help of federated clusters. You can generate multiple Kubernetes clusters within a data center/cloud and use federation clusters to control/manage all of them in one place.

The federated clusters can achieve this by doing the following two things. 

  • Cross cluster discovery - Provides the ability to have DNS and Load Balancer with backends from all participating clusters.
  • Sync Resources across clusters - Syncs resources across the clusters for deploying the same deployment set across multiple clusters.
  1. What are the best security measures that you can take while using Kubernetes?

Here are a few ways to ensure security while using Kubernetes:

  • By restricting access to ETCD
  • By applying security updates to the environment regularly
  • By implementing network segmentation
  • By logging everything on the producing environment
  • By having continuous security vulnerability scanning
  • By having a strict policy or protocol for resources
  • By enabling auditing
  • By defining resource quota
  • By limiting direct access to Kubernetes nodes
  • By using images from the authorized repository only

MCQ Based Kubernetes Interview Questions

These are quick MCQ questions that recruiters can use as a refresher during your interview. (Answers are at the bottom of this section)

Questions                                                                                                                

 Choices                                                                                                            

  1. What are minions in the Kubernetes cluster? 

  1. They are monitoring engines used widely in Kubernetes.

  2. They are docker container services.

  3. They are components of the master node.

  4. They are the work-horse/worker node of the cluster.

2. The handler invoked by Kubelet to check if a container’s IP address is open or not is?

  1. TCPSocketAction

  2. None of the above

  3. HTTPGetAction

  4. ExecAction

3. What did the 1.8 version of Kubernetes introduce?

  1. Secrets

  2. Federated Clusters

  3. Taints and Tolerations

  4. Cluster level Logging


 

4. How to define a service without a selector?

  1. Just by specifying the IP address

  2. Specifying the label and api-version

  3. Specify the external name

  4. Specify an endpoint with IP Address and port


 

5. What are the responsibilities of a Replication Controller?

  1. Creates a new pod, if the existing pod crashes

  2. Update or delete multiple pods with a single command

  3. Helps to achieve the desired state

  4. All


 

6. What are the responsibilities of a node controller?

  1. To assign a CIDR block to the nodes

  2. To maintain the list of nodes

  3. To monitor the health of the nodes

  4. All of them

7. The Kubernetes network proxy runs on which node?

  1. Master Node

  2. Worker Node

  3. All the nodes

  4. All of them

8. Which of the following are core Kubernetes objects?

  1. Pods

  2. Services

  3. Volumes

  4. All of them

9. Which of them is a Kubernetes Controller?

  1. ReplicaSet

  2. Deployment

  3. Rolling Updates

  4. Both ReplicaSet and Deployment

10. Kubernetes cluster data is stored in which of the following?

  1. Kube-apiserver

  2. Kubelet

  3. Etcd

  4. None 

 

Answers - 1 - b, 2 - c, 3-c, 4-c, 5-d, 6-d, 7-c, 8-d, 9-d,10-c.

Scenario-Based Kubernetes Interview Questions

This section will tell you certain scenarios that recruiters can put during the interview to check your intellect and practical field knowledge with response speed.

Scene 1 - Imagine an MNC with a very much distributed system with a large number of data centers, VMs (Virtual Machines) and have employees working on multiple tasks.

How do you think such a company manages all the tasks systematically via the Kubernetes tool?

MNCs create & launch thousands of containers along with tasks running across vast nodes in a distributed system, around the world. In such an event, they need to use some platform that could give them scalability, agility, and DevOps practice for cloud-native applications.

They can use Kubernetes to customize their scheduling architecture & give support to multiple container formats. Kubernetes makes it possible to create a linking between container tasks and helps in achieving efficiency with great support for container storage and container networking solutions.

Scene 2 -Imagine there is a company built on monolithic architecture handling so many products. Now, in today’s scaling industry when they are trying to expand their business, their monolithic architecture has started causing problems. 

So how do you think the company can shift from monolithic to microservices & launch their services containers?

They can put each of these built-in microservices over the Kubernetes platform. They can start by migrating their services once or twice first & analyze or monitor them to make sure it is running stable. And once they feel everything is going great, then they can think of migrating the rest of the application into the Kubernetes cluster.

Scene 3 - Consider a company that wants to increase its speed & efficiency of its technical operations and that too with minimal costs.

What do you suggest, how can the company try to achieve this?

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The company can opt for DevOps methodology by constructing a CI/CD pipeline, but configurations can take time to go up and run. After the CI/CD pipeline, the company can/should plan to work in the cloud environment. 

While working in a cloud environment, they can think of scheduling containers on a cluster and orchestrating it with the Kubernetes tool. It will help the company to reduce its deployment time (as the company wanted speed), and will also help to reach across various environments faster and efficiently.

Scene 4 - Imagine a company wants to update its deployment methods & wants to now build a platform that is much more responsive & scalable.

How do you think this company can get ahead with this to surpass its customers’ expectations?

The company should move from their private data centers (if having any) to any cloud environment, let’s say AWS. Not just that, but they should also deploy the microservice architecture so that they can use Docker containers. Once their base framework is ready, then they can start using the Kubernetes, the best orchestration platform available. This would allow the teams to become autonomous in building and delivering applications very quickly and scalably.

Scene 5 - There is an MNC company with a very much distributed system, who wants to solve their monolithic code base problem.

What solution would you suggest to the company?

I would suggest they should shift their monolithic codebase to a microservice design and then there every microservices can be looked as a container. And further, they can deploy and orchestrate these containers with the help of Kubernetes.

Scene 6 - A company wants to optimize the distribution of its workloads by adopting new technologies.

How do you think this company can do the distribution of resources so efficiently & speedily?

They should use Kubernetes. Kubernetes helps in optimizing the resources efficiently, as it uses only those resources which are needed by that particular application. Since Kubernetes is the best container orchestration tool, the company can achieve the desired distribution of resources efficiently with this tool easily.

Scene 7 - When we shift from monolithic to microservices, the development side problems reduce but increase at the deployment side.

How do you think any company can resurrect that?

The team can use container orchestration platforms like Kubernetes & run it in data centers. It will help the company to generate a templated application and deploy it within like 5 minutes and will have actual instances containerized in the staging environment. There will be dozens of microservices running in parallel to enhance the production rate and even if a node goes down, it will be rescheduled immediately without impacting the performance.

Scene 8 -  There is a company that wants to provide all the required handouts to its customers.

How do you think the company can dynamically do this?

The company can use Docker environments to compile a cross-sectional team for building a web app using Kubernetes. This framework will help the company get the required things into production in a lesser time frame. And with such a machine running, the company can provide the required handouts to all the customers having various environments.

Scene 9 - There is a carpooling company that wants to increase their servers along with scaling their platform.

How do you think the company will achieve that?

The company can go for containerization. Once they deploy their application into containers, they can take the help of Kubernetes for orchestration and make use of container monitoring tools to monitor the actions in containers. 

The use of containers will help them achieve better capacity planning in the data center because they will now have fewer hindrances due to the abstraction between the hardware and services.

Scene 10 - There is a company that wants to run multiple workloads on diverse cloud infrastructure from a single-tenant physical server (bare metal server) to a public cloud.

How do you think this company can do this by having different interfaces?

The company can turn to microservices and further adopt the Kubernetes orchestration tool. The tool will support the company in running multiple workloads on diverse cloud infrastructures.

Summing Up on Interview Questions on Kubernetes for 2020!

In this article, we have listed top Kubernetes interview questions from basics to advanced in 4 different interesting formats. These interview questions on the Kubernetes application, the architecture will help you get a base for interview preparation. Prepare them thoroughly, revise them, and you will be good to go.

And, if you are a self-taught learner, it is better to take a Kubernetes certification training online as it will better help you ingrain the concepts & topics around this tool and job of Kubernetes professionals, as well as competent Kubernetes certifications. During the training, you will even have access to more tentative Interview questions on Kubernetes (commonly asked ones by top tier companies).

How about starting with our Kubernetes Training’s free demo today!


    Janbask Training

    A dynamic, highly professional, and a global online training course provider committed to propelling the next generation of technology learners with a whole new way of training experience.


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