I have Kubernetes cluster v1.19.16 set up in bare metal Ubuntu-18.04 server and currently i want to connect cluster jenkins service through http://jenkins.company.com. Haproxy server side frontend & backend already been configured.

My service.yaml file content as follows,

apiVersion: v1
kind: Service
metadata:
  name: jenkins-svc
  namespace: jenkins
  annotations:
      prometheus.io/scrape: 'true'
      prometheus.io/path:   /
      prometheus.io/port:   '8080'
spec:
  selector: 
    app: jenkins-server
  type: ClusterIP
  ports:
    - protocol: TCP
      port: 8080
      targetPort: 80

ingress-resource.yaml file content as follows,

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: jenkins-ingress
  namespace: jenkins
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: "jenkins.company.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          serviceName: jenkins-svc
          servicePort: 8080

# kubectl get service -n jenkins
NAME          TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
jenkins-svc   ClusterIP   10.96.136.255   <none>        8080/TCP   20m

# kubectl get ing jenkins-ingress
Warning: extensions/v1beta1 Ingress is deprecated in v1.14 , unavailable in v1.22 ; use networking.k8s.io/v1 Ingress
NAME              CLASS    HOSTS                ADDRESS   PORTS   AGE
jenkins-ingress   <none>   jenkins.company.com            80      5h42m

# kubectl describe ingress  -n jenkins
Warning: extensions/v1beta1 Ingress is deprecated in v1.14 , unavailable in v1.22 ; use networking.k8s.io/v1 Ingress
Name:             jenkins-ingress
Namespace:        jenkins
Address:
Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
Rules:
  Host             Path  Backends
  ----             ----  --------
  jenkins.dpi.com
                   /   jenkins-svc:8080 (10.244.0.16:80)
Annotations:       ingress.kubernetes.io/rewrite-target: /
                   kubernetes.io/ingress.class: nginx
Events:            <none>

When i tried to access http://jenkins.company.com it shows below error message on browser.

Please let me know what i'm missing here?

CodePudding user response：

The issue with the service port and container port. Jenkins default port is 8080, so I assume your service port is 80

  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

and ingress should be

spec:
  rules:
  - host: "jenkins.company.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          serviceName: jenkins-svc
          servicePort: 80

port: The port of this service targetPort The target port on the pod(s) to forward traffic to

Difference between targetPort and port in Kubernetes Service definition