Coder not fetching resources behind Ingress Controller in Fanout

[trobert2]

• code-server 1.1140-vsc1.33.1:
• OS Version: debian 9 stretch

Description

When running multiple coder instances in fanout, the resources cannot be fetched.
Errors from console:

GET https://coder.tools.aws.cps.vodafone.com/ide.main.0dbbd1.css net::ERR_ABORTED 404
wef4jr85v-python:36 GET https://coder.tools.aws.cps.vodafone.com/ide.main.0dbbd1.js net::ERR_ABORTED 404
wef4jr85v-python:7 GET https://coder.tools.aws.cps.vodafone.com/ide.1.0dbbd1.js net::ERR_ABORTED 404
wef4jr85v-python:36 GET https://coder.tools.aws.cps.vodafone.com/ide.main.0dbbd1.js net::ERR_ABORTED 404
manifest.2d6501a9cec51964cb818234b83e7c94.json:1 GET https://coder.tools.aws.cps.vodafone.com/manifest.2d6501a9cec51964cb818234b83e7c94.json 404

Steps to Reproduce

Deploy on kubernetes. Expose ingress like this example

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.allow-http: "false"
    nginx.ingress.kubernetes.io/app-root: /python
    nginx.ingress.kubernetes.io/auth-signin: https://$host/oauth2/start
    nginx.ingress.kubernetes.io/auth-url: https://$host/oauth2/auth
    nginx.ingress.kubernetes.io/cors-allow-credentials: "true"
    nginx.ingress.kubernetes.io/cors-allow-methods: PUT, GET, POST, OPTIONS
    nginx.ingress.kubernetes.io/cors-allow-origin: https://coder.my.dns.company.com
    nginx.ingress.kubernetes.io/enable-cors: "true"
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /
  labels:
    app: coder
    flavour: python
  name: python-coder
  namespace: coder
spec:
  rules:
  - host: coder.my.dns.company.com
    http:
      paths:
      - backend:
          serviceName: python-coder
          servicePort: 8443
        path: /python
  tls:
  - hosts:
    - coder.my.dns.company.com
    secretName: coder-tls-secret

I have also tried this without success:

    nginx.ingress.kubernetes.io/configuration-snippet: |
      sub_filter_once on;
      sub_filter '<base href="/"' '<base href="/python/"';

If I define a path /* I have gotten it to work. The problem is the resources are being fetched from random sources since I have defined multiple coder instances and this path is on all definitions for that hostname. For example I would have deployed coder under /python with python tools, /go with golang tools and so on. In this scenario I have seen ide.main.0dbbd1.css being fetched from the go coder instance when I loaded python

Reading more into this I think it's related to the paths used. They should be relative and not include /.
Source: https://stackoverflow.com/questions/50871970/kubernetes-ingress-nginx-loading-resources-404

any help would be appreciated.

[trobert2]

Duplicate of #670