Nginx ingress error 404 using host and path

user_4129450 0
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I'm using Kubernetes on Azure cloud, and I have installed zipkin. I already install nginx ingress, and if I use the following host rule, it works fine:


apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress
  annotations:
    ingress.kubernetes.io/rewrite-target: /
    kubernetes.io/ingress.class: nginx
  namespace: nginx-ingress
spec:
    - host: zipkin.hostname.com
      http:
        paths:
          - backend:
              serviceName: zipkin
              servicePort: 9411

But this is not what I want. What I want is something like hostname.com/zipkin.

I tried with this, but I got a 404 error:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress
  annotations:
    ingress.kubernetes.io/rewrite-target: /
    kubernetes.io/ingress.class: nginx
  namespace: nginx-ingress
spec:
  rules:
  - http:
      paths:
        - path: /zipkin
          backend:
            serviceName: zipkin
            servicePort: 9411

What do I have to do?

Edit: I tried to add the host and after doing a describe command i get this

Name:             NAME
Namespace:        NAMESPACE
Address:
Default backend:  default-http-backend:80 (<none>)
Rules:
  Host           Path  Backends
  ----           ----  --------
  hostname.com
                 /zipkin   zipkin:9411 (10.244.0.63:9411)

EDIT: I solved my issue adding a rewrite rule annotation

nginx.org/rewrites: >
      serviceName=zipkin rewrite=/;
azure-aks kubernetes-ingress nginx
3 Answers

It's because you haven't mentioned the host here:

spec:
  rules:
  -  host: hostname.com // here
     http:
      paths:
        - path: /zipkin
          backend:
            serviceName: zipkin
            servicePort: 9411
user_110320440

First, previous answer is wrong, you don't need to specify host it is not mandatory unless you want to set up a DNS.

Second, the backend zipkin requires the /zipkin URI to respond right? If this is the case, then the rewrite annotation is removing the URI. So you would need to change your yaml like this to pass /zipkin to your backend. 

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress
  annotations:
    kubernetes.io/ingress.class: nginx
  namespace: nginx-ingress
spec:
  rules:
  - http:
      paths:
        - path: /zipkin
          backend:
            serviceName: zipkin
            servicePort: 9411
user_67138690

Just to clarify the OP problem.

There are different ingress Controllers

Note:

When you create an ingress, you should annotate each ingress with the appropriate ingress.class to indicate which ingress controller should be used if more than one exists within your cluster.

If you do not define a class, your cloud provider may use a default ingress controller.

Ideally, all ingress controllers should fulfill this specification, but the various ingress controllers operate slightly differently.

Using this annotation: 

nginx.org/rewrites: >
      serviceName=zipkin rewrite=/;

It looks like you are using NGINX Ingress Controller provided by nginxinc.

You can find more information about Rewrites Support for NGINX Ingress Controller provided by nginxinc here.

example:

nginx.org/rewrites: "serviceName=service1 rewrite=rewrite1[;serviceName=service2 rewrite=rewrite2;...]"

It's different from the kubernetes community at kubernetes/ingress-nginx repo. Different ingress controllers have different configs and annotations.

So for this example:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.org/rewrites: "serviceName=my-nginx rewrite=/"
  name: test-ingress
  namespace: default
spec:
  rules:
  - host: hostname.com
    http:
      paths:
      - backend:
          serviceName: my-nginx
          servicePort: 80
        path: /zipkin
status:
  loadBalancer:
    ingress:
    - ip: xx.xxx.xxx.xx

Test it:

curl -vH 'Host:hostname.com' xx.xxx.xxx.xx/zipkin


* Connected to xx.xxx.xxx.xx (xx.xxx.xxx.xx) port 80 (#0)
> GET /zipkin HTTP/1.1
> Host:hostname.com
> User-Agent: curl/7.52.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.17.5
< Date: Mon, 28 Oct 2019 12:21:48 GMT
< Content-Type: text/html
< Content-Length: 612
< Connection: keep-alive
< Last-Modified: Tue, 22 Oct 2019 14:30:00 GMT
< ETag: "5daf1268-264"
< Accept-Ranges: bytes
<
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
user_112074140
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