Kubernetes ingress rules for external service

There is a service that can echo my request back to me: https://postman-echo.com/, it will come useful later.Here is its ip and it will simulate your external service:

$ dig postman-echo.com +short107.23.20.188

It works as following:

$ curl 107.23.20.188/get | jq{  "args": {},  "headers": {    "x-forwarded-proto": "http",    "x-forwarded-port": "80",    "host": "107.23.20.188",    "x-amzn-trace-id": "Root=1-5ebced9c-941e363cc28bf3529b8e7246",    "user-agent": "curl/7.52.1",    "accept": "*/*"  },  "url": "http://107.23.20.188/get"}

So as you can see it sends me a json with all headers that I sent to it and most importantly - url with path it receives.

Here is the ingress yaml I used:

apiVersion: extensions/v1beta1kind: Ingressmetadata:  name: external-service  annotations:    #kubernetes.io/ingress.class: "nginx"    nginx.ingress.kubernetes.io/ingress.class: "nginx"    nginx.ingress.kubernetes.io/ssl-redirect: "false"    nginx.ingress.kubernetes.io/rewrite-target: /$1spec:  rules:  - host:    http:      paths:      - backend:          serviceName: external-ip          servicePort: 80        path: /es/(.*)

Service and Endpoint definition stays the same as yours with exception for endpoint IP. Here I used 107.23.20.188 (the postman-echo IP).

Now lets try to send some requests through nginx but first lets check whats ingress ip:

$ kubectl get ingressNAME               HOSTS   ADDRESS         PORTS   AGEexternal-service   *       192.168.39.96   80      20h

The ip is 192.168.39.96 and its private IP because I am running it on minikube but it should not matter.

$ curl -s 192.168.39.96/es/get{  "args": {},  "headers": {    "x-forwarded-proto": "http",    "x-forwarded-port": "80",    "host": "192.168.39.96",    "x-amzn-trace-id": "Root=1-5ebcf259-6331e8c709656623f1a94ed4",    "x-request-id": "d1545d1e8764da3cf57abb143faac4fb",    "x-forwarded-host": "192.168.39.96",    "x-original-uri": "/es/get",    "x-scheme": "http",    "user-agent": "curl/7.52.1",    "accept": "*/*"  },  "url": "http://192.168.39.96/get"}

so as you see I am sending request for path /es/get and echo server is receiving /get.

One thing I have noticed while writing this answer is that (maybe its just copy-paste error but) your quotes in annotations ” are different than " and this may be causing that nginx is not processing annotations as it should. Im my case for some reason when I was copy-pasting your yaml it it was working but so it did without your annotations so that may be the reason I haven't noticed it earlier.