Kubernetes Layers You Need to Know as a DevOps Engineer

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Kubernetes (K8s) applications aren’t just about containers—they rely on additional layers to make them enterprise-ready. Below are the key layers every DevOps engineer should master.

1. Load Balancer

→ Acts as the entry point for incoming traffic.
→ Distributes network traffic across backend servers and pods.

→ Ensures high availability and fault tolerance.

Commands & Practice:

 Check services with load balancer type 
kubectl get svc --all-namespaces

Describe a specific service 
kubectl describe svc <service-name> -n <namespace>

Forward traffic to test locally 
kubectl port-forward svc/<service-name> 8080:80

2. Ingress Controller

→ Manages external access to services.

→ Routes HTTP/S traffic efficiently.

→ Gateway APIs are emerging as a replacement.

Commands & Practice:

 List all ingress resources 
kubectl get ingress --all-namespaces

Apply an ingress manifest 
kubectl apply -f ingress.yaml

Check ingress controller logs 
kubectl logs -n <namespace> <ingress-pod-name>

3. Kube Proxy

→ Maintains network rules for pod communication.

→ Handles traffic forwarding.

Commands & Practice:

 Check kube-proxy status 
systemctl status kube-proxy

View iptables rules (if using iptables mode) 
sudo iptables -L -t nat

4. Sidecars

→ Extends app functionality (logging, monitoring).

→ Runs alongside the main container in the same pod.

Commands & Practice:

 Check pod containers 
kubectl get pods <pod-name> -o jsonpath='{.spec.containers[].name}'

Logs from a sidecar container 
kubectl logs <pod-name> -c <sidecar-container>

5. Service Mesh

→ Manages service-to-service communication.

→ Provides mTLS, observability, and traffic control.

Commands & Practice (Istio Example):

 Install Istio 
istioctl install --set profile=demo

Verify Istio sidecar injection 
kubectl get pods -n <namespace>

Enable mTLS for a namespace 
kubectl apply -f - <<EOF 
apiVersion: security.istio.io/v1beta1 
kind: PeerAuthentication 
metadata: 
name: default 
namespace: <namespace> 
spec: 
mtls: 
mode: STRICT 
EOF

You Should Know:

  • Debugging K8s Networking: 
    Check pod network connectivity 
kubectl run -it --rm debug-pod --image=busybox -- sh 
wget -O- <service-name>.<namespace>.svc.cluster.local:80

  • Persistent Storage (CSI): 

    List storage classes 
kubectl get storageclass

Create a PersistentVolumeClaim 
kubectl apply -f pvc.yaml

  • Security (Network Policies): 

    Apply a network policy 
kubectl apply -f network-policy.yaml

Verify policies 
kubectl get networkpolicy --all-namespaces

What Undercode Say

Mastering these Kubernetes layers ensures robust, scalable, and secure deployments. Load balancers and ingress controllers handle traffic, while sidecars and service meshes enhance observability. Kube-proxy and network policies secure internal communications. Always test configurations in a staging environment before production.

Prediction

As Kubernetes evolves, Gateway APIs will replace Ingress, and service meshes will become standard for microservices. Expect tighter integration with AI-driven autoscaling and security policies.

Expected Output:

A fully configured Kubernetes cluster with optimized load balancing, ingress routing, sidecar logging, and service mesh security.

Relevant URL:

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References:

Reported By: Vsadhwani Kubernetes – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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