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CNCF CKAD: Certified Kubernetes Application Developer

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How to Prepare for CNCF Certified Kubernetes Application Developer

Preparation Guide for CNCF Certified Kubernetes Application Developer

Introduction for CNCF Certified Kubernetes Application Developer

The Certified Kubernetes Application Developer (CKAD) program has been developed by the Cloud Native Computing Foundation (CNCF), in collaboration with The Linux Foundation, to help expand the Kubernetes ecosystem through standardized training and certification.

The Certified Kubernetes Application Developer exam certifies that users can design, build, configure, and expose cloud native applications for Kubernetes. The Certified Kubernetes Application Developer can design build, configure and expose cloud native applications for Kubernetes. A CKAD can define application resources and use core primitives to build, monitor, and troubleshoot scalable applications & tools in Kubernetes.

The certification program allows users to demonstrate their competence in a hands-on, command-line environment. The purpose of the Certified Kubernetes Application Developer (CKAD) program is to provide assurance that CKADs have the skills, knowledge, and competency to perform the responsibilities of Kubernetes application developers. The exam assumes knowledge of, but does not test for, container runtimes and microservice architecture. The successful candidate will be comfortable using:

  • An OCI-Compliant Container Runtime, such as Docker or rkt
  • Cloud Native application concepts and architectures
  • A Programming language, such as Python, Node.js, Go, or Java

This exam is an online, proctored, performance-based test that consists of a set of performance-based tasks (problems) to be solved in a command line. Candidates have 2 hours to complete the tasks. The exam is based on Kubernetes v1.19 and the candidate can get understanding of it by taking CNCF CKAD practice exam and CNCF CKAD practice tests. The CKAD exam environment will be aligned with the most recent K8s minor version within approximately 4 to 8 weeks of the K8s release date

Exam Topics for CNCF Certified Kubernetes Application Developer

Kubernetes provides many powerful tools to help manage complex applications. In order to fully utilize all that Kubernetes has to offer, you need some understanding of its features and how to design application to run on Kubernetes. The Certified Kubernetes Application Developer (CKAD) certification focuses on these topics. The following will be discussed in CNCF CKAD dumps:

  • 13% – Core Concepts
  • 18% – Configuration
  • 10% – Multi-Container Pods
  • 18% – Observability
  • 20% – Pod Design
  • 13% – Services & Networking
  • 8% – State Persistence

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer Core Concepts

The following will be discussed in CNCF CKAD exam dumps:

  • Understand Kubernetes API primitives
  • Create and configure basic Pods

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer Configuration

The following will be discussed in CNCF CKAD dumps:

Understand ConfigMaps

  • Understand SecurityContexts
  • Define an application’s resource requirements
  • Create & consume Secrets
  • Understand ServiceAccounts

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer Multi-Container Pods

The following will be discussed in CNCF CKAD dumps pdf:

  • Understand Multi-Container Pod design patterns (e .g. ambassador, adapter, sidecar)

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer Observability

The following will be discussed in CNCF CKAD dumps:

  • Understand LivenessProbes and ReadinessProbes
  • Understand container logging
  • Understand how to monitor applications in Kubernetes
  • Understand debugging in Kubernetes

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer Pod Design

The following will be discussed in CNCF CKAD dumps:

  • Understand Deployments and how to perform rolling updates
  • Understand Deployments and how to perform rollbacks
  • Understand Jobs and CronJobs
  • Understand how to use Labels, Selectors, and Annotations

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer Services & Networking

The following will be discussed in CNCF CKAD dumps:

  • Understand Services
  • Demonstrate basic understanding of NetworkPolicies

Understanding functional and technical aspects of CNCF Certified Kubernetes Application Developer State Persistence

The following will be discussed in CNCF CKAD dumps:

  • Understand PersistentVolumeClaims for storage

Certification Path for for CNCF Certified Kubernetes Application Developer

This certification is for Kubernetes engineers, cloud engineers and other IT professionals responsible for building, deploying, and configuring cloud native applications with Kubernetes.

CKAD has been developed by The Linux Foundation and the Cloud Native Computing Foundation (CNCF), to help expand the Kubernetes ecosystem through standardized training and certification. This exam is an online, proctored, performance-based test that consists of a set of performance-based tasks (problems) to be solved in a command line.

There is no pre-requisite.

What is the cost of CNCF Certified Kubernetes Application Developer

  • Cost: $300 USD
  • Format: Multiple choices, multiple answers
  • Length of Examination: 120 minutes
  • Number of Questions: 40
  • Passing Score: 70%

The benefit in Obtaining the CNCF Certified Kubernetes Application Developer

As CKA is linked with KCSP, being CKA certified also opens doors in your career. It can also help you gain an advantage in the hiring process of some organisations. I’ve seen a few organisations mandating the certification, and in that scenario, it would be helpful for you to quickly get within the shortlisted candidates.

At least in the course of preparing for these certifications, you will learn the core of Kubernetes and would appreciate what it can and cannot do. You will also understand what resources you can use in what kind of situations. And while you pass this certification and prepare for the next bit, Kubernetes concepts would be very natural for you.

You can also use certifications to validate your knowledge. It helps you understand what you know about the subject and also address some of the gaps or aspects of the tool you were missing. It also allows you to understand best practices and utilities.

Difficulty in Attempting CNCF Certified Kubernetes Application Developer

As CNCF Kubernetes Certifications are entirely hands-on, you can’t simply bluff your way through them. You have to give the time and dedication to progress — merely knowing the concepts is not enough. You also need to do your thing and know the real stuff.

While the exams are open-book, you can only refer to kubernetes.io and github.com/kubernetes, which makes it even more challenging given the limited time you have. You can’t pass this exam if you haven’t developed muscle memory.

Certification is valuable, but whether or not you should do it depends on your requirements and tech positioning. If you think that just doing this certification will land you an excellent job without any working knowledge, then please don’t attempt it.

It may allow you initially during the hiring process, but you will probably be turned down when you land in the tech interview phase. When I do interviews, certification doesn’t matter much — I look at what experience the candidate caries and what value they can deliver to the team or the position I’m hiring for.

Yes, you get to understand all aspects of Kubernetes by preparing for the certification. But you won’t learn much about the kind of issues you might face in real-world situations — that’s completely different from what you’re presented with during the preparation. You will need CNCF CKAD practice exam and CNCF CKAD practice tests for that.

For more info about CNCF Certified Kubernetes Application Developer

CNCF CKAD

Sample Questions of CNCF Certified Kubernetes Application Developer

  1. Create a namespace called ggckad-s0 in your cluster. Run the following pods in this namespace. Write down the output of kubectl get pods for the ggckad-s0 namespace.
  • A pod called pod-a with a single container running the kubegoldenguide/simple-http-server image
  • A pod called pod-b that has one container running the kubegoldenguide/alpine-spin:1.0.0 image, and one container running nginx:1.7.9
  1. All operations in this question should be performed in the ggckad-s2 namespace. Run a pod called question-two-pod with a single container running the kubegoldenguide/alpine-spin:1.0.0 image, and expose these configuration settings as environment variables inside the container. Create a ConfigMap called app-config that contains the following two entries:
  • ‘connection_string’ set to ‘localhost:4096’
  • ‘external_url’ set to ‘google.com’
  1. All operations in this question should be performed in the ggckad-s2 namespace. Create a pod that has two containers. Both containers should run the kubegoldenguide/alpine-spin:1.0.0 image. The first container should run as user ID 1000, and the second container with user ID 2000. Both containers should use file system group ID 3000.

  2. All operations in this question should be performed in the ggckad-s4 namespace. This question will require you to create a pod that runs the image kubegoldenguide/question-thirteen. This image is in the main Docker repository at hub.docker.com.

This image is a web server that has a health endpoint served at ‘/health’. The web server listens on port 8000. (It runs Python’s SimpleHTTPServer.) It returns a 200 status code response when the application is healthy. The application typically takes sixty seconds to start.

  1. Create a pod called question-13-pod to run this application, making sure to define liveness and readiness probes that use this health endpoint.

All operations in this question should be performed in the ggckad-s5 namespace. Create a file called question-5.yaml that declares a deployment in the ggckad-s5 namespace, with six replicas running the nginx:1.7.9 image.

Each pod should have the label app=revproxy. The deployment should have the label client=user. Configure the deployment so that when the deployment is updated, the existing pods are killed off before new pods are created to replace them.

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