Ingress-nginx-defaultbackend overrides application's 404 error

[abhiverma001]

Here is configuration what I have done to route the 404 and 503 errors on defaultbackend:

• Defined custom HTML pages for 404 and 503 errors in a ConfigMap called custom-error-pages.
• Enabled the defaultBackend in the ingress-nginx Helm chart.
• Mounted the custom-error-pages ConfigMap as a volume to the default backend Pod.
• Set up extraVolumeMounts to serve the custom HTML files.
• Edited the ingress-nginx-controller ConfigMap to include the custom-http-errors key with values 404,503 to indicate these errors should be served by the default backend.

It is working as per the expectation but there is an issue, With this configuration default-backend overrides the applications's 404 errors also, I don't want that, If any application returns a 404 error then it should use that page only, traffice should not be routed on default-backend pod at that time.

If any one can help here to fix this please.....

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[longwuyuan]

You said you configured 404 in the configMap and you also say you don't want 404 to be response from defaultbackend. This is not possible.

[longwuyuan]

/kind support

[abhiverma001]

You said you configured 404 in the configMap and you also say you don't want 404 to be response from defaultbackend. This is not possible.

Ofcourese I want 404 response from defaultbackend but only for unmatched paths (404) in ingress.

and If ingress path is matched but the application/api (running inside the pod) returns 404 error at that time don't want to redirect the traffice on default-backend instead error should be appear exactly same what application returns

[longwuyuan]

I am not sure if there is that intelligence in the controller code.
I think you need to dive into the nginx.conf directives that provide this functionality https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#custom-http-errors

[abhiverma001]

It is fixed by removing the 404 value form custom-http-errors key in ingress-nginx-controller ConfigMap
And even removing this 404 for unmathched path traffice is still being routed to default-backend and also now application's 404 error is not being over ride by default-backend.