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Kubernetes ​

Practical guide to Kubernetes commands and configuration for deploying applications.

Overview ​

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

Key Concepts ​

  • Pod: Smallest deployable unit, one or more containers
  • Service: Stable network endpoint for a set of Pods
  • Deployment: Manages ReplicaSets and rolling updates
  • Namespace: Virtual cluster for resource isolation
  • ConfigMap / Secret: Configuration and sensitive data management

Basic Commands ​

bash
# View cluster info
kubectl cluster-info

# List all pods
kubectl get pods

# List all services
kubectl get services

# List all deployments
kubectl get deployments

# Describe a resource
kubectl describe pod <pod_name>

# View logs
kubectl logs <pod_name>

# Execute a command in a pod
kubectl exec -it <pod_name> -- /bin/sh

Deployment Example ​

yaml
# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
        - name: my-app
          image: ghcr.io/user/my-app:latest
          ports:
            - containerPort: 3000

Service Example ​

yaml
# service.yaml
apiVersion: v1
kind: Service
metadata:
  name: my-app-service
spec:
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
  type: LoadBalancer

Resources ​