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.

day3 npm error

in the day3 multistage file , i recieved this error

Step 6/8 : RUN npm run build
 ---> Running in 436caa2eb802
npm error Missing script: "build"
npm error
npm error To see a list of scripts, run:
npm error   npm run

npm error A complete log of this run can be found in: /root/.npm/_logs/2024-09-07T08_05_04_400Z-debug-0.log
The command '/bin/sh -c npm run build' returned a non-zero code: 1

this is the complete docker build output

docker build -t todomulti:v1  .
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon  6.734MB
Step 1/8 : FROM node:18-alpine AS installer
18-alpine: Pulling from library/node
43c4264eed91: Pull complete 
3696426c5aa2: Pull complete 
cdccf44a82db: Pull complete 
21f39b9ddd19: Pull complete 
Digest: sha256:b5b8fd22b37b34e61c70d960cb6049c8b3f02525864dc2f677b54fa9e0ceff58
Status: Downloaded newer image for node:18-alpine
 ---> f48cc5826852
Step 2/8 : WORKDIR /app
 ---> Running in ee06a10e9cae
 ---> Removed intermediate container ee06a10e9cae
 ---> bc3db8cf4016
Step 3/8 : COPY package*.json .
 ---> fca23256b62f
Step 4/8 : RUN npm install
 ---> Running in 42dfaf4166bd
npm warn deprecated @npmcli/[email protected]: This functionality has been moved to @npmcli/fs
npm warn deprecated [email protected]: This package is no longer supported.
npm warn deprecated [email protected]: This package is no longer supported.
npm warn deprecated [email protected]: This package is no longer supported.
npm warn deprecated [email protected]: Rimraf versions prior to v4 are no longer supported
npm warn deprecated [email protected]: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
npm warn deprecated [email protected]: Glob versions prior to v9 are no longer supported

added 490 packages, and audited 491 packages in 22s

58 packages are looking for funding
  run `npm fund` for details

4 vulnerabilities (3 high, 1 critical)

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.
npm notice
npm notice New minor version of npm available! 10.7.0 -> 10.8.3
npm notice Changelog: https://github.com/npm/cli/releases/tag/v10.8.3
npm notice To update run: npm install -g [email protected]
npm notice
 ---> Removed intermediate container 42dfaf4166bd
 ---> fe57c2be707c
Step 5/8 : COPY . .
 ---> 66319f3b6670
Step 6/8 : RUN npm run build
 ---> Running in b6a7dc6a3257
npm error Missing script: "build"
npm error
npm error To see a list of scripts, run:
npm error   npm run

npm error A complete log of this run can be found in: /root/.npm/_logs/2024-09-07T08_02_52_088Z-debug-0.log
The command '/bin/sh -c npm run build' returned a non-zero code: 1

getting-started-app master* 󰞨 nvim Dockerfile

getting-started-app master* 󱍢 nvim Dockerfile 

getting-started-app master* 󱍢 docker build -t todomulti:v1  .
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon  6.734MB
Step 1/8 : FROM node:18-alpine AS installer
 ---> f48cc5826852
Step 2/8 : WORKDIR /app
 ---> Using cache
 ---> bc3db8cf4016
Step 3/8 : COPY package*.json ./
 ---> c71d81469390
Step 4/8 : RUN npm install
 ---> Running in 2ca1d6638816
npm warn deprecated [email protected]: This package is no longer supported.
npm warn deprecated @npmcli/[email protected]: This functionality has been moved to @npmcli/fs
npm warn deprecated [email protected]: Rimraf versions prior to v4 are no longer supported
npm warn deprecated [email protected]: This package is no longer supported.
npm warn deprecated [email protected]: This package is no longer supported.
npm warn deprecated [email protected]: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
npm warn deprecated [email protected]: Glob versions prior to v9 are no longer supported

added 490 packages, and audited 491 packages in 20s

58 packages are looking for funding
  run `npm fund` for details

4 vulnerabilities (3 high, 1 critical)

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.
npm notice
npm notice New minor version of npm available! 10.7.0 -> 10.8.3
npm notice Changelog: https://github.com/npm/cli/releases/tag/v10.8.3
npm notice To update run: npm install -g [email protected]
npm notice
 ---> Removed intermediate container 2ca1d6638816
 ---> 9b734df48283
Step 5/8 : COPY . .
 ---> a422006ebf3e
Step 6/8 : RUN npm run build
 ---> Running in 436caa2eb802
npm error Missing script: "build"
npm error
npm error To see a list of scripts, run:
npm error   npm run

npm error A complete log of this run can be found in: /root/.npm/_logs/2024-09-07T08_05_04_400Z-debug-0.log
The command '/bin/sh -c npm run build' returned a non-zero code: 1

piyushsachdeva / cka-2024 Goto Github PK

cka-2024's Introduction