Kubernetes course

1. What is Kubernetes?

Definition: Kubernetes (K8s) is an open-source container orchestration platform designed to automate the deployment, scaling, and management of containerized applications. It abstracts the underlying infrastructure, providing a consistent and scalable environment for deploying and running applications in containers.

Discussion:

• Discuss the need for container orchestration.
• Explain the history and origin of Kubernetes.
• Highlight key features of Kubernetes, such as scalability, resilience, and portability.

2. K8s Architecture

Overview: Kubernetes architecture consists of a master node and worker nodes. The master node manages the cluster, while worker nodes run the applications.

Discussion:

• Break down the components of the master node (API Server, etcd, Controller Manager, and Scheduler).
• Describe the role of worker nodes and their components (Kubelet, Kube Proxy, and Container Runtime).

3. Main K8s Components

Components:

• Pods
• ReplicaSets
• Deployments
• Services
• ConfigMaps
• Secrets

Discussion:

• Explain each component's purpose in a Kubernetes cluster.
• Discuss how these components work together to manage applications.

4. Minikube and Kubect - Local Setup

Setup:

• Install Minikube for local Kubernetes cluster.
• Install kubectl, the Kubernetes command-line tool.

Demonstration:

• Demonstrate how to start a local cluster with Minikube.
• Introduce kubectl commands for interacting with the cluster.

5. Main Kubectl Commands - K8s CLI

Commands:

• kubectl get
• kubectl describe
• kubectl create
• kubectl apply
• kubectl delete

Hands-on:

• Perform basic operations using kubectl commands.
• Show how to retrieve information about resources, create, apply, and delete resources.

6. K8s YAML Configuration File

YAML Structure:

• Discuss the structure of a typical Kubernetes YAML file.
• Explain how to define Pods, Services, Deployments, etc., in YAML.

Hands-on:

• Create simple Kubernetes resources using YAML files.
• Apply and manage these resources using kubectl.

7. K8s Namespaces - Organize your Components

Concept:

• Explain the concept of namespaces for organizing and isolating resources in a cluster.

Usage:

• Demonstrate how to create and use namespaces.
• Discuss best practices for namespace usage.

8. K8s Ingress

Definition:

• Introduce Ingress as an API object that manages external access to services within a cluster.

Configuration:

• Show how to configure Ingress rules to route traffic to different services.
• Discuss SSL termination and path-based routing.

9. Helm - Package Manager

Overview:

• Introduce Helm as the package manager for Kubernetes.
• Explain how Helm charts are used to define, install, and upgrade even the most complex Kubernetes applications.

Demonstration:

• Show how to install Helm and use Helm charts to deploy applications.

10. Volumes - Persisting Data in K8s

Storage in K8s:

• Discuss the need for persistent storage in Kubernetes.
• Introduce the concept of volumes and persistent volume claims (PVCs).

Hands-on:

• Show how to create and use volumes to persist data in a Kubernetes cluster.

11. K8s StatefulSet - Deploying Stateful Apps

Stateful Applications:

• Discuss the challenges of deploying stateful applications in Kubernetes.
• Introduce StatefulSets as controllers for stateful applications.

Hands-on:

• Demonstrate the use of StatefulSets to deploy and manage stateful applications.

12. K8s Services

Service Types:

• Introduce different types of Kubernetes Services (ClusterIP, NodePort, LoadBalancer).

Hands-on:

• Show how to create and expose services to enable communication between pods.

By covering these topics step by step, your Kubernetes course will provide a comprehensive understanding of key concepts, components, and practical skills for working with Kubernetes.