Kubernetes Explained for Beginners!

Introduction.

What is Kubernetes?

Key Components of Kubernetes.

• Node: A node is a worker machine (either a physical or virtual machine) that runs containerized applications.
• Pod: A pod is the smallest deployable unit in Kubernetes, consisting of one or more containers that share storage and network resources.
• Deployment: A deployment defines the desired state of your application, including the number of replicas, updates strategies, and more.
• Service: A service is an abstraction that defines a logical set of pods and a policy for accessing them.
• Namespace: Namespaces are used to organize and isolate resources within a Kubernetes cluster.

Getting Started with Kubernetes:

1. Set up a Kubernetes Cluster:

• Option 1: Use a managed Kubernetes service like Google Kubernetes Engine (GKE), Amazon Elastic Kubernetes Service (EKS), or Azure Kubernetes Service (AKS).
• Option 2: Install a local Kubernetes cluster using Minikube (for development and learning purposes).

2. Install the Kubernetes Command-Line Tool (kubectl):

•  Download and install the kubectl tool for your operating system from the official Kubernetes website.

3. Create a Deployment:

•  Create a new deployment by defining the desired state in a YAML file:

 apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.19.2
        ports:
        - containerPort: 80

• Apply the deployment by running:kubectl apply -f deployment.yaml

4. Expose the Deployment as a Service:

• Create a service to expose the deployment externally:

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
  - port: 80
    targetPort: 80

• Apply the service by running: kubectl apply -f service.yaml

5. Access the Application:

• If running locally (e.g., Minikube), you can access the application by running: minikube service nginx-service
• If running on a cloud provider, you can access the application using the provided external IP or load balancer.

Conclusion.