Understanding Kubernetes

Kubernetes (K8s) is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications.

Key Concepts

  1. Pods
  2. Services
  3. Deployments
  4. ConfigMaps
  5. Secrets

Basic Pod Definition

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.14.2
    ports:
    - containerPort: 80

Simple Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2

Common Commands

# Get cluster info
kubectl cluster-info

# Create resources
kubectl apply -f deployment.yaml

# List resources
kubectl get pods
kubectl get deployments

Stay tuned for more Kubernetes tutorials!