Ingress is Not Working on My Kubernetes Clusters: A Troubleshooting Guide

Introduction

Are you tired of staring at your Kubernetes clusters, wondering why Ingress just won’t work? You’re not alone! Ingress can be finicky, but don’t worry, we’ve got you covered. In this comprehensive guide, we’ll walk you through the most common issues and provide you with step-by-step solutions to get your Ingress up and running in no time.

Before We Dive In…

Make sure you have:

• Kubernetes cluster set up and running
• Ingress controller installed and configured
• A basic understanding of Kubernetes and Ingress concepts

Troubleshooting Ingress Issues

Issue 1: Ingress Not Configured

If you haven’t configured your Ingress correctly, it won’t work. Period. Let’s check if that’s the case:

kubectl get ingress

If you don’t see your Ingress defined, create one using:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-ingress
spec:
  rules:
  - host: example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: example-service
          servicePort: 80

Issue 2: Ingress Controller Not Running

Verify if your Ingress controller is running:

kubectl get deployments -n ingress-nginx

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-0.40.2/deploy/static/provider/cloud_generic/deploy.yaml

Issue 3: Incorrect Service Configuration

Check if your Service is exposed correctly:

kubectl get svc

apiVersion: v1
kind: Service
metadata:
  name: example-service
spec:
  selector:
    app: example-app
  ports:
  - name: http
    port: 80
    targetPort: 80
  type: LoadBalancer

Issue 4: DNS Resolution

Verify if your domain is resolving correctly:

dig example.com

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-ingress
spec:
  rules:
  - host: example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: example-service
          servicePort: 80
  tls:
  - hosts:
    - example.com
    secretName: example-tls

Troubleshooting Ingress-Nginx Issues

Issue 1: Nginx Configuration

Check if your Nginx configuration is correct:

kubectl exec -it nginx-ingress-controller-xxxxx -- cat /etc/nginx/nginx.conf

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-config
data:
  nginx.conf: |
    http {
      ...
      upstream backend {
        server example-service:80;
      }
      ...
    }

Issue 2: Nginx Logs

Inspect Nginx logs for errors:

kubectl logs -f nginx-ingress-controller-xxxxx

2022/02/20 14:30:01 [error] 11#11: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 10.0.0.1, server: example.com, request: "GET / HTTP/1.1", upstream: "http://10.0.0.2:80/", host: "example.com"

Troubleshooting Ingress-GCE Issues

Issue 1: GCE Firewall Rules

Verify if your GCE firewall rules are configured correctly:

gcloud compute firewall-rules list --filter="targetTags=INGRESS-GCE"

gcloud compute firewall-rules create allow-http --allow=tcp:80 --target-tags=INGRESS-GCE

Issue 2: GCE Routes

Check if your GCE routes are configured correctly:

gcloud compute routes list --filter="network=default,target=INGRESS-GCE"

gcloud compute routes create INGRESS-GCE --network=default --next-hop-instance=$INSTANCE --next-hop-instance-zone=$ZONE --tags=INGRESS-GCE

Conclusion

Ingress can be finicky, but with this comprehensive guide, you should be able to troubleshoot and resolve the most common issues. Remember to check your Ingress configuration, Service exposure, DNS resolution, and Ingress controller status. If you’re still stuck, don’t hesitate to reach out to the Kubernetes community for help!

Additional Resources

For further learning and troubleshooting, we recommend checking out the following resources:

• Kubernetes Ingress Documentation: https://kubernetes.io/docs/concepts/services-networking/ingress/
• Ingress-Nginx Documentation: https://kubernetes.github.io/ingress-nginx/
• Ingress-GCE Documentation: https://cloud.google.com/kubernetes-engine/docs/concepts/ingress-xlb
• Kubernetes Slack Channel: https://kubernetes.slack.com/

Good luck, and happy troubleshooting!

Frequently Asked Question

Having trouble with Ingress on your Kubernetes cluster? Don’t worry, you’re not alone! Here are some common issues and their solutions: