Ingress backends

https://kubernetes.io/docs/concepts/services-networking/service/

https://kubernetes.io/docs/concepts/services-networking/service/#external-ips

https://voyagermesh.com/docs/10.0.0/guides/ingress/http/external-svc/

https://voyagermesh.com/docs/10.0.0/guides/ingress/http/external-svc/#using-external-ip

https://kubernetes.io/docs/concepts/services-networking/service/#headless-services

https://link.medium.com/O66JLckTmub

https://kubernetes.io/docs/concepts/services-networking/endpoint-slices/

.spec.clusterIP must be "None"

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Using External Service as Ingress Backend You can use an external service as a Backend for Kubernetes Ingress. There are 2 options depending on whether the external service has an external IP or DNS record.

Using External IP You can introduce any external IP address as a Kubernetes service by creating a matching Service and Endpoint object. Then you can use this service as a backend for your Ingress rules.

apiVersion: v1 kind: Service metadata:

 name: external-ip

spec:

 ports:
 - name: app
   port: 80
   protocol: TCP
   targetPort: 9855
 clusterIP: None

type: ClusterIP

apiVersion: v1 kind: Endpoints metadata:

 name: external-ip

subsets: - addresses:

 # list all external ips for this service
 - ip: 172.17.0.5
 ports:
 - name: app
   port: 9855
   protocol: TCP

Now, you can use this external-ip Service as a backend in your Ingress definition. For example:

apiVersion: voyager.appscode.com/v1beta1 kind: Ingress metadata:

 name: test-ings-rhvulnlb
 namespace: test-x

spec:

 backend:
   serviceName: external-ip
   servicePort: "80"

<br />

Subdir exact

apiVersion: networking.k8s.io/v1 kind: Ingress metadata:

 name: monitor-utils-subdir
 annotations:
   # nginx.ingress.kubernetes.io/configuration-snippet: |
   #   if ( $arg_proxyToken != "hytokentext" ) {
   #     return 401 'Unauthorized proxy token!';
   #   }
   nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
   nginx.ingress.kubernetes.io/whitelist-source-range: 10.0.0.0/8
   nginx.ingress.kubernetes.io/rewrite-target: /$2

spec:

 ingressClassName: nginx
 tls:
 - hosts:
   - monitor.mktp.io
   secretName: tls-monitor-example-com
 rules:
   - host: monitor.example-com
     http:
       paths:
         - path: /monitor-utils(/|$)(.*)
         # - path: /monitor-utils/
           pathType: Exact
           backend:
             service:
               name: monitor-utils
               port:
                 number: 8080

```