Kubernetes Common Issues and Solutions

By /

Listen to this Post

Featured Image
Kubernetes is a powerful container orchestration platform, but users often encounter common issues. Below are some frequent problems and their solutions, along with practical commands and steps to troubleshoot them.

🔗 Reference: TechOps Examples Newsletter

You Should Know: Troubleshooting Kubernetes Issues

1. Pods Stuck in “Pending” State

Cause: Insufficient resources, node taints, or scheduling constraints.

Commands to Debug:

kubectl describe pod <pod-name>  Check events for pending reason 
kubectl get nodes  Verify node availability 
kubectl get events --sort-by=.metadata.creationTimestamp  View cluster-wide events

Solution:

  • Increase node resources or scale the cluster.
  • Check taints and tolerations: 
    kubectl describe node <node-name> | grep Taint

2. CrashLoopBackOff Errors

Cause: Application crashes, misconfigured probes, or resource limits.

Debugging Steps:

kubectl logs <pod-name> --previous  View previous logs if container restarted 
kubectl describe pod <pod-name>  Check exit codes and restarts

Solution:

  • Adjust `livenessProbe` and `readinessProbe` intervals.
  • Increase memory/CPU limits in deployment.yaml.

3. DNS Resolution Failures

Cause: CoreDNS misconfiguration or network policies blocking traffic.

Check DNS Pods:

kubectl get pods -n kube-system -l k8s-app=kube-dns 
kubectl logs -n kube-system <coredns-pod-name>

Test DNS Resolution Inside a Pod:

kubectl run -it --rm --image=busybox dns-test --restart=Never -- nslookup kubernetes.default

4. Persistent Volume (PV) Issues

Cause: StorageClass not defined or PVC stuck in “Pending”.

Debugging Commands:

kubectl get pv,pvc  Check PV/PVC binding status 
kubectl describe pvc <pvc-name>

Solution:

  • Ensure `StorageClass` exists: 
    kubectl get storageclass
  • If using dynamic provisioning, verify cloud provider permissions.

5. Kubectl Connection Errors

Cause: Misconfigured `kubeconfig` or API server issues.

Fix:

kubectl config view  Verify current context 
export KUBECONFIG=~/.kube/config  Ensure correct config path 
kubectl cluster-info  Check API server status

What Undercode Say

Kubernetes troubleshooting requires systematic debugging. Always check:

  • Pod logs (kubectl logs)
  • Events (kubectl get events)
  • Resource limits (kubectl describe node)
  • Network policies (kubectl get networkpolicy)

For deeper issues, use:

kubectl get pods -o wide  Check pod-node distribution 
kubectl top pods  Monitor resource usage

Prediction

As Kubernetes adoption grows, AI-driven troubleshooting tools will automate issue detection, reducing manual debugging efforts. Expect more integrated logging and auto-healing features in future releases.

Expected Output:

✔ Debugged Pods

✔ Resolved CrashLoopBackOff

✔ Fixed DNS Issues

✔ Working Persistent Volumes

✔ Stable Kubectl Connectivity

IT/Security Reporter URL:

Reported By: Govardhana Miriyala – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

Join Our Cyber World:

💬 Whatsapp | 💬 Telegram

Related Posts: