Certified Kubernetes Administrator(CKA) 2024

This is the GitHub repository to host all the notes, diagrams, assignments, and resources from the CKA course published on YouTube.

Note: If you found the content helpful, consider giving the repository a star ⭐

Checkout this file for the #40daysofkubernetes challenge details

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Day0: Intro to the series

• Course Introduction
• Discord community server for assistance
• Live QnA sessions every weekend
• #40daysofkubernetes challenge

Day 1: Docker Fundamentals

Status: Video is live, check out 👉 Day1 👈 folder for notes and useful links ✅

• What is Docker?
• How is it different from Virtual Machines
• Docker Architecture
• Docker flow
• Docker commands

Day 2 Video: Dockerize an application

Status: Video is live, check out 👉 Day2 👈 folder for notes and useful links ✅

• What is Dockerfile, and how do you write it?
• docker pull , push, tag etc

Day3 Video: Docker Multi-Stage Builds

Status: Video is live, check out 👉 Day3 👈 folder for notes and useful links ✅

• How to write a dockerfile for multistage build
• Benefits of multi-stage builds
• Other docker best practices

Day 4 Video: Why do We need Kubernetes?

Status: Video is live, check out 👉 Day4 👈 folder for notes and useful links ✅

Day 5 Video: Kubernetes Architecture

Status: Video is live, check out 👉 Day5 👈 folder for notes and useful links ✅

• Control plane VS Worker Nodes
• Overview of control plane components

Day 6 Video: Install Kubernetes Cluster locally

Status: Video is live, check out 👉 Day6 👈 folder for notes and useful links ✅

• Install Kind cluster locally
• How to access the cluster

Day7 Video: Pods in Kubernetes

Status: Video is live, check out 👉 Day7 👈 folder for notes and useful links ✅

• What are pods in Kubernetes?
• Containers VS Pods
• Imperative VS Declarative way for creating Kubernetes resources
• Create a sample pod using the imperative way
• Create a sample pod using the declarative way
• Inspect the pods

Day8 Video: Replicasets and Deployments in Kubernetes:

Status: Video is live, check out 👉 Day8 👈 folder for notes and useful links ✅

• Replication Controller
• ReplicaSet
• Deployments
• How to perform Rolling updates/rollback
• Scale the deployment

Day9 Video: Services in Kubernetes:

Status: Video is live, check out 👉 Day9 👈 folder for notes and useful links ✅

• What are services in Kubernetes, and why do we need them?
• Node port, ClusterIP, and LoadBalancer

Day 10 Video: Namespaces:

Status: Video is live, check out 👉 Day10 👈 folder for notes and useful links ✅

• NameSpaces
• Services and namespaces

Day 11 Video: Multi-container Pods

Status: Video is live, check out 👉 Day11 👈 folder for notes and useful links ✅

• What are multi-container pods
• Multi-container pods pattern - sidecar/init etc
• Environment variables in Kubernetes

Day 12 Video: Daemonset, Cronjob, and job

Status: Video is live, check out 👉 Day12 👈 folder for notes and useful links ✅

• What are Daemonset, cronjobs and Jobs
• Cron fundamentals with examples

Day13 Video: Static Pods

Status: Video is live, check out 👉 Day13 👈 folder for notes and useful links ✅

• What are static pods
• Labels and selectors
• Manual Scheduling

Day14 Video: Taints and Tolerations

Status: Video is live, check out 👉 Day14 👈 folder for notes and useful links ✅

Day15 Video: Node Affinity

Status: Video is live, check out 👉 Day15 👈 folder for notes and useful links ✅

Day16 Video: Resource Requests and Limits

Status: Video is live, check out 👉 Day16 👈 folder for notes and useful links ✅

Day17 Video: Autoscaling in Kubernetes

Status: Video is live, check out 👉 Day17 👈 folder for notes and useful links ✅

• Horizontal VS Vertical Autoscaling
• HPA, VPA, Cluster autoscaling, NAP
• Metrics server

Day18 Video: Probes in Kubernetes

Status: Video is live, check out 👉 Day18 👈 folder for notes and useful links ✅

• Liveness VS Readiness Probes
• HTTP/TCP/Command-based health checks

Day19 Video: Config maps and Secrets

Status: Video is live, check out 👉 Day19 👈 folder for notes and useful links ✅

• concept and demo

Day 20 Video: How SSL/TLS works

Status: Video is live, check out 👉 Day20 👈 folder for notes and useful links ✅

• Symmetric VS Asymmetric encryption
• SSL certificates and Certificate Authority

Day 21 Video: TLS in Kubernetes

Status: Video is live, check out 👉 Day21 👈 folder for notes and useful links ✅

• How TLS works in Kubernetes
• Why we need TLS in Kubernetes
• Private key and public certificates

Day 22 Video: Authorization in Kubernetes

Status: Video is live, check out 👉 Day22 👈 folder for notes and useful links ✅

• Authorization VS Authentication
• Authorization types, ABAC, RBAC, Node, Webhook
• Kubeconfig

Day 23 Video: Role-based access control (RBAC)

Status: Video is live, check out 👉 Day23 👈 folder for notes and useful links ✅

• Role and role binding
• Generate and approve the certificate
• grant access to the user

Day 24 Video: Cluster role and cluster role binding

Status: Video is live, check out 👉 Day24 👈 folder for notes and useful links ✅

• concept and demo

Day 25 Video: Service Account

Status: Video is live, check out 👉 Day25 👈 folder for notes and useful links ✅

• What are service accounts, and why do we use them?
• Create a service account and grant access to it

Day26 Video: Network Policies

Status: Video is live, check out 👉 Day26 👈 folder for notes and useful links ✅

• Network policy concept
• CNI installation
• enforce network policy by creating the object

Day27 Video: Use Kubeadm to install a Kubernetes cluster

Status: Video is live, check out 👉 Day27 👈 folder for notes and useful links ✅

• Provision underlying infrastructure to deploy a Kubernetes cluster
• Setup Master Node to deploy Kubernetes components
• Setup multiple worker nodes and join the master node

Day28 Video: Docker storage fundamentals

Status: Video is live, check out 👉 Day28 👈 folder for notes and useful links ✅

• Why do we need storage in docker containers
• persistent docker storage

Day29 Video: Storage in Kubernetes

• How storage works in Kubernetes
• hostpath volumes in Kubernetes
• Persistent volumes and Persistent volume claims
• Volume modes, Access modes, and reclaim policies for volumes
• Storage classes and provisions

Day30 Video: How does DNS work?

• What happens when you type a website address in your browser
• different components involved in DNS
• End-to-end flow
• Important files and resources

Day31 Video: DNS in kubernetes

• How DNS works in Kubernetes
• Core-DNS

Day32 Video: Kubernetes Networking

• CNI , Network Add-on
• Containerd vs runc , container runtime

Day 33 Video: Ingress controller and Ingress resources

Day 34 Video: Perform a version upgrade on a Kubernetes cluster using Kubeadm

Day 35 Video: Implement etcd backup and restore

Day 36 Video: Monitoring, Logging and Alerting

• Monitor Cluster components, Evaluate cluster and node logging
• Understand how to monitor applications, metric server
• Manage container stdout & stderr logs

Day 37 Video: Troubleshoot application failure

Day 38 Video: Troubleshoot cluster component failure

Day 39 Video: Network Troubleshooting

• Worker node failure
• cordon, uncordon and drain (maintenance)\

Day 40 Video: JSONPath, advance kubectl commands

• JSON for beginners
• JSON v/s YAML
• JSONPATH basics
• Multiple JSONPATH queries to fetch details

Day 41 Mission CKA

• Exam Pattern
• Pre-requisites
• Last-minute preparation
• Tips and Tricks
• Sample questions

Day 42 Video: Realtime project: Host your own container registry on Kubernetes

• This project will include multiple Kubernetes topics with real-time implementation.

Frequently asked questions:

I've been overwhelmed by the fantastic response to my new YouTube series on the Certified Kubernetes Administrator (CKA) exam! But with all the excitement came some questions, and I'm here to address them head-on.

1) 𝐈 𝐜𝐚𝐧𝐧𝐨𝐭 𝐚𝐟𝐟𝐨𝐫𝐝 𝐭𝐡𝐞 𝐂𝐊𝐀 𝐞𝐱𝐚𝐦 𝐢𝐭'𝐬 𝐭𝐨𝐨 𝐞𝐱𝐩𝐞𝐧𝐬𝐢𝐯𝐞. 𝐒𝐡𝐨𝐮𝐥𝐝 𝐈 𝐬𝐭𝐢𝐥𝐥 𝐟𝐨𝐥𝐥𝐨𝐰 𝐚𝐥𝐨𝐧𝐠?

The content of this playlist is based on the exam curriculum because it provides a well-organized learning path. You don't have to worry about the roadmap; you can focus on learning. Even if you are not taking the exam now, you are still gaining the hands-on knowledge that a Kubernetes administrator should have; that's good enough!

𝟐) 𝐖𝐡𝐚𝐭 𝐚𝐫𝐞 𝐭𝐡𝐞 𝐩𝐫𝐞𝐫𝐞𝐪𝐮𝐢𝐬𝐢𝐭𝐞𝐬 𝐟𝐨𝐫 𝐭𝐡𝐢𝐬 𝐜𝐨𝐮𝐫𝐬𝐞?

The only prerequisites are basic Linux understanding; all the other prerequisites are already covered in this series. Check out the GitHub repo below for the course content. Yes, it is absolutely free for anyone to join and follow along.

𝟑) 𝐖𝐡𝐢𝐜𝐡 𝐂𝐥𝐨𝐮𝐝 𝐩𝐫𝐨𝐯𝐢𝐝𝐞𝐫 𝐚𝐫𝐞 𝐰𝐞 𝐮𝐬𝐢𝐧𝐠 𝐟𝐨𝐫 𝐭𝐡𝐞 𝐝𝐞𝐦𝐨?

We will not be using any Cloud as the focus is on Kubernetes. Using a cloud service would mean the cloud provider manages the control plane, limiting learning. We will use a local Kubernetes installation on a Kind cluster and a Kubeadm installation on virtual machines.

𝟒) 𝐀𝐫𝐞 𝐰𝐞 𝐝𝐨𝐢𝐧𝐠 𝐚𝐧𝐲 𝐫𝐞𝐚𝐥-𝐭𝐢𝐦𝐞 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐢𝐧 𝐭𝐡𝐢𝐬 𝐬𝐞𝐫𝐢𝐞𝐬?

Yes, there will be a couple of real-time projects at the end of this series. We cannot do real-time full-fledged projects in Kubernetes without completing all the essential topics. That is why I added the projects at the end and hands-on tasks in almost every video.

5) 𝐇𝐨𝐰 𝐦𝐚𝐧𝐲 𝐯𝐢𝐝𝐞𝐨𝐬 𝐰𝐢𝐥𝐥 𝐛𝐞 𝐩𝐮𝐛𝐥𝐢𝐬𝐡𝐞𝐝 𝐞𝐯𝐞𝐫𝐲 𝐰𝐞𝐞𝐤?

I have finished recording the entire series and am editing the last few videos. I plan to publish 3 to 4 weekly videos every Monday through Thursday. I have chosen not to publish daily so that viewers following the series have time to understand the concepts, practice hands-on, document their learning, and not feel left behind.

6) 𝐖𝐡𝐚𝐭 𝐢𝐟 𝐰𝐞 𝐚𝐫𝐞 𝐬𝐭𝐮𝐜𝐤 𝐬𝐨𝐦𝐞𝐰𝐡𝐞𝐫𝐞 𝐚𝐧𝐝 𝐧𝐞𝐞𝐝 𝐚𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐜𝐞?

You can comment on the video by providing complete details about the issue/query, or you can open a new thread in the discord channel of help-cka-2024, and someone will help you. I also plan to host a live Q&A session every weekend.