Kubernetes ingress domain redirect

Question

i want to redirect domain in nginx ingress kubernete.

https://test.example.io/preview/qLxiVcDGxCaQ134650121853FTg4

if in url preview comes change domain redirect

https://test.app.example.io/preview/qLxiVcDGxCaQ134650121853FTg4

what i was trying

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    certmanager.k8s.io/cluster-issuer: staging
    nginx.ingress.kubernetes.io/rewrite-target: /
    kubernetes.io/ingress.class: nginx
  name: staging-ingress
spec:
  rules:
  - host: test.example.io
    http:
      paths:
      - path: /
        backend:
          serviceName: service-1
          servicePort: 80
      - path: /preview/*
        backend:
          url: 
          serviceName: service-2
          servicePort: 80
  tls:
  - hosts:
    - test.example.io
    secretName: staging

for simple nginx block is like

location ~ /preview
    {
      rewrite /preview https://test.app.example.com$uri permanent;
    }

Thanh Nguyen Van · Accepted Answer · 2019-11-04T08:42:36.893

22

My logic thinking, try it :

metadata:
      annotations:
        nginx.ingress.kubernetes.io/configuration-snippet: |
         rewrite /preview https://test.app.example.com$uri permanent;

spec:
      rules:
      - host: test.example.io
        http:
          paths:
          - path: /
            backend:
              serviceName: service-1
              servicePort: 80
      - host: test.app.example.io
        http:
          paths:
          - path: /preview/*
            backend:
              serviceName: service-2
              servicePort: 80

Hope it works !

On code above: You should not access using: https://test.app.example.io/preview/ (It just be redirected link ) at all.

edited Nov 04 '19 at 08:42

answered Nov 04 '19 at 08:36

Thanh Nguyen Van

10,292
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53

Thanks for writing answer i used `server-snippet` instead of `configuration-snippet` now it's working. Thanks once again. – Harsh Manvar Nov 04 '19 at 09:25
How you Can manage public IP for sub domain ? – Quentin Merlin Apr 06 '21 at 05:51
that annotations line is magic. Thank you – motizukilucas Jun 13 '22 at 19:10

score 3 · Answer 2 · answered Nov 04 '19 at 09:26

3

Used nginx ingress annotation

nginx.ingress.kubernetes.io/server-snippet: |
      location ~ /preview {
         rewrite /preview https://test.app.example.com$uri permanent;
      }

answered Nov 04 '19 at 09:26

Harsh Manvar

27,020
6
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score 1 · Answer 3 · answered Mar 29 '23 at 09:58

I may be late for OP but I don't think the accepted solution completely answers the original question.

We can use NGINX's conditional URL rewrites offered by the ngx_http_rewrite_module to detect if a host matches the initial domain before redirecting to the new host. Here, the condition is based on the host name : $host (other vars are also available in NGINX, for a more advanced configuration).

nginx.ingress.kubernetes.io/server-snippet: |
  if ($host = "<OLD_HOSTNAME>") {
    rewrite /preview $scheme://<NEW_HOSTNAME>$uri permanent;
  }

Also, and I'm in accordance with OP's comment on that point, I would not recommend using nginx.ingress.kubernetes.io/configuration-snippet for such custom configuration, as this kind of snippet would add the custom configuration into the location block of each ingress rule.

Instead, if we still want to use annotation snippets, use a nginx.ingress.kubernetes.io/server-snippet to add a configuration that would apply to the whole NGINX instance. Also, it could lead to unexpected results.

score 0 · Answer 4 · answered Nov 04 '19 at 06:32

0

Try this -

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    certmanager.k8s.io/cluster-issuer: staging
    nginx.ingress.kubernetes.io/rewrite-target: /$1
    kubernetes.io/ingress.class: nginx
  name: staging-ingress
spec:
  rules:
  - host: test.example.io
    http:
      paths:
      - path: /(.*)
        backend:
          serviceName: service-1
          servicePort: 80
      - path: /preview/(.*)
        backend: 
          serviceName: service-2
          servicePort: 80
  tls:
  - hosts:
    - test.example.io
secretName: staging

You can refer this too, representing synonymous kind of issue

answered Nov 04 '19 at 06:32

Tushar Mahajan

2,044
1
7
18

i want to redirect from `test.example.com` to `test.app.example.com` – Harsh Manvar Nov 04 '19 at 06:37
you can add different host entry for that – Tushar Mahajan Nov 04 '19 at 06:40
1

how to add new host entry mean ? – Harsh Manvar Nov 04 '19 at 06:42
1

one host is test.example.com, other can be test.app.example.com, and you can map the backend services to them in the respect .yaml manifests – Tushar Mahajan Nov 04 '19 at 06:42
but if i will new host entry it will check path `preview ` for that host. if contain or not. while i want to check on domain `test.example.com` and redirect to `test.app.example.com` – Harsh Manvar Nov 04 '19 at 06:45

Kubernetes ingress domain redirect

4 Answers4

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