New Cloud Technologies - Kubernetes Basics

New Cloud Technologies - Kubernetes Basics

Kubernetes is an open-source container orchestration platform designed to automate the deployment, scaling, and management of containerized applications.

What is Kubernetes?

Kubernetes, also known as K8s, is a powerful system for managing containerized applications in a clustered environment. It provides mechanisms for deployment, maintenance, and scaling of applications.

Key Components of Kubernetes

  • Nodes: The worker machines that run containerized applications.
  • Pods: The smallest deployable units, consisting of one or more containers.
  • Services: Abstracts a set of pods and provides a stable endpoint.
  • Deployments: Manages the deployment and scaling of pod replicas.

Why Use Kubernetes?

  • Scalability: Automatically scale applications based on demand.
  • Resilience: Self-healing capabilities to restart failed containers.
  • Portability: Works across different environments, from local to cloud.

Setting Up a Kubernetes Cluster

Step 1: Install Minikube

Minikube is a tool that sets up a local Kubernetes cluster on your machine.

# Install Minikube
curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
chmod +x minikube
sudo mv minikube /usr/local/bin/

Step 2: Start Minikube

# Start Minikube
minikube start

Step 3: Deploy an Application

Create a deployment YAML file.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

Apply the deployment.

kubectl apply -f deployment.yaml

Step 4: Expose the Deployment

Expose the deployment as a service.

kubectl expose deployment nginx-deployment --type=NodePort --port=80

Conclusion

Kubernetes is a powerful tool for managing containerized applications at scale. Its features enable efficient deployment, scaling, and maintenance, making it an essential technology for modern cloud-native applications.

I hope this article gives you a good introduction to Kubernetes. Happy orchestrating!