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Kubernetes🔗

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Installation🔗

Install kubectl and minikube for local testing

# kubectl  
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"  
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl  

# minikube  
curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64  
sudo install minikube-linux-amd64 /usr/local/bin/minikube  
minikube start --driver=docker

Essential Commands🔗

Category Command Description
Pods kubectl get pods -A List all pods
kubectl describe pod <name> Inspect pod details
Deployments kubectl rollout status deploy/<name> Check deployment
kubectl scale deploy/<name> --replicas=3 Scale replicas
Services kubectl expose deploy/<name> --port=80 Create service
Debugging kubectl logs <pod> -f Stream logs
kubectl exec -it <pod> -- sh Enter container shell

Sample Deployment (deploy.yml)

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

Apply

kubectl apply -f deploy.yml

Tips🔗

  • Context Switching
kubectl config use-context <cluster-name>
  • port forwarding
kubectl port-forward svc/nginx 8080:80
  • resources limits
resources:  
  limits:  
    memory: "512Mi"  
    cpu: "1"

Security Best Practices🔗

  • Use Role-Based Access Control(RBAC)
  • Enable Netowrk Policies
  • Scan images with Trivy
trivy image nginx:alpine

Resources🔗