Kubernetes Ingress backend subpath

Is it possible in any way to redirect a hostpath to a subpath on the backend? Similar how subPaths work for volumes.

The ingress would look like this:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: jupyter-notebook-ingress
  annotations:
    kubernetes.io/ingress.class: nginx
spec:
  rules:
    - host: jptrntbk.MYDOMAIN.com
      http:
        paths:
          - path: /
            backend:
              serviceName: jupyter-notebook-service
              servicePort: 8888
              subPath: /lab

Navigation to jptrntbk.MYDOMAIN.com would redirect to /lab on the backend and all other parentpaths are unavailable.

Solution

Create an Ingress rule with a app-root annotation:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/app-root: /app1
  name: approot
  namespace: default
spec:
  rules:
  - host: approot.bar.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /

Check the rewrite is working

$ curl -I -k http://approot.bar.com/
HTTP/1.1 302 Moved Temporarily
Server: nginx/1.11.10
Date: Mon, 13 Mar 2017 14:57:15 GMT
Content-Type: text/html
Content-Length: 162
Location: http://approot.bar.com/app1
Connection: keep-alive

or can you create an Ingress rule with a rewrite annotation:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: rewrite
  namespace: default
spec:
  rules:
  - host: rewrite.bar.com
    http:
      paths:
      - backend:
          serviceName: http-svc
          servicePort: 80
        path: /something(/|$)(.*)

In this ingress definition, any characters captured by (.*) will be assigned to the placeholder $2, which is then used as a parameter in the rewrite-target annotation.

For example, the ingress definition above will result in the following rewrites: - rewrite.bar.com/something rewrites to rewrite.bar.com/ - rewrite.bar.com/something/ rewrites to rewrite.bar.com/ - rewrite.bar.com/something/new rewrites to rewrite.bar.com/new

Source: https://kubernetes.github.io/ingress-nginx/examples/rewrite/