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kubernetes interview questions

Last update: 25 Jan 2020, 19 QuestionsAsk Question
A Quick Overview of Kubernetes

Kubernetes is used as a platform for automating direction, scaling, and program setup. Created by Google, it is currently managed by Cloud Indigenous Computing Foundation. Kubernetes intends to provide an efficient solution for systems by simplifying installation, scaling, and operations of app containers round clusters of hosts. It operates on a cluster mode to reach out to container programs. Most cloud hosting providers supply a Kubernetes-based infrastructure or platform for something (PaaS or even IaaS) in which Kubernetes may be set up as being platform-providing support. Below are some Kubernetes interview questions which are vital for candidates whether they are a beginner, intermediate or expert.

Kubernetes
What is Kubernetes? Kubernetes is an open-source container-orchestration system for automating utility deployment, management and scaling. It used to be at first designed via Google and is now maintained via the Cloud Native Computing Foundation.
Latest Version 1.179th December 2019
Developed By Cloud Native Computing Foundation
Written in Go
License Apache License 2.0
Author Google
Official Website https://kubernetes.io

Best Kubernetes Interview Questions And Answers

Though both Docker Swarm and Kubernetes are wired to save resources by limiting the use of hardware and leveraging cloud-based applications to meet the business resource requirement, there are some differences between them that call for a subjective analysis before going down one chosen road.

Docker Swarm Kubernetes
It is a bit advanced and requires skills of Docker CLI Easy to Install
No in-built tools, though there is a scope to download third-party apps. Have in-built tools for logging and performance monitoring.
Is advanced and has the potential to scale much higher than Kubernetes. It’s not as scalable as Docker Swarm, but it is known for its strength to maintain clusters.

Container orchestration is basically managing the lifecycle of multiple containers, especially in large and/or dynamic environments. Developer Teams generally use it to control and automate multiple tasks such as:

  • Setting up and deployment of containers
  • Repetition and availability of containers
  • Editing, scaling or removing containers in such a way that load is spread evenly on the host architecture
  • Moving specific containers between clusters or from one host to another to maintain the balance of supply/demand in a host, or if a host expires
  • Allocating resources to containers as per requirement
  • Maintaining and controlling external exposure of services running in a container with the outside environment
  • Load balancing of service discovery between containers
  • Health monitoring of containers and hosts
  • Configuration of an application in accordance with the containers running in it

Note: The above Kubernetes interview questions and answers are a guide to candidates preparing for a job change.

In Kubernetes v1.17, up to 5000 nodes can be supported within a cluster.

cAdvisor is an open-source resource usage collector for containers in a cluster. It is used in Kubernetes to support containers natively while operating on a per-node basis.

It auto-discovers all containers in a specific node and collects CPU, memory, filesystem, and network usage stats. cAdvisor also provides useful metrics like overall machine usage by analyzing the ‘root’ container on your machine.

A Kubelet is the lowest level component present in Kubernetes. It is used for supporting and maintaining what’s running on every individual machine. It's like a process watcher focused on running a given set of containers.

Minikube is an open-source tool that enables a user to run Kubernetes on a laptop or other local machines. It can work with various Operating Systems like Linux, Mac, and Windows. It works as a single-node cluster inside a virtual machine on your local machine. It is used in Kubernetes to evaluate important features and help scale the environment via effective maintenance and control.

Note: The above Kubernetes architect interview questions are a guide to candidates and may help in securing a relevant job.

Components in Kubernetes are a vital process in a cluster that helps in the overall scalability and maintenance of an environment. Here's an image of how different components in Kubernetes combine to perform efficiently.

Components fall under two main categories which consist of sub-categories:

1. Master Components:

  • Kube-apiserver
  • Etcd
  • Kube-scheduler
  • Kube-controller-manager

2. Node Components:

  • Kubelet
  • Kube-Proxy
  • Container Runtime

Heapster is an open-source metrics collection system that is used for performance monitoring and is compatible with Kubernetes versions 1.0.6 and above. It ensures the collection of performance metrics about specific workloads, pods, nodes and containers. In addition, it also allows for the collection of metrics during events and other signals being generated by your cluster. It helps and supports multiple backends for persisting the data.

Metrics Server is used as a cluster-wide aggregator of resource usage data. It is used to collect data and manage it among resources in a set of clusters. Its primary purpose is to collect metrics like CPU or memory consumption for containers or nodes, from the Summary API, exposed by Kubelet on each node.

Prometheus is an open-source metrics collection system originally developed at Soundcloud, and more recently integrated into the CNCF. It is powerful due to its data model, a rich set of client libraries functions, and its ability to create user-specific custom alerts or notifications based on data through metrics. Prometheus comes with its own standard dashboard which can be used to run ad-hoc queries or minor issues during debugging, but the most important aspect of Prometheus is utilized when integrating it with visualization backends.

Note: The above interview questions on Kubernetes are a guide to experienced, intermediate and beginner developers preparing for a job change.

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