Question

How to set up IP whitelist on DigitalOcean Kubernetes?

Posted March 2, 2020 1.6k views
Kubernetes

I’ve set up whitelist annotation on my ingress, on Kubernetes cluster, but in logs there are wrong IP-s, so it doesn’t work.

Here is ingress configuration:

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: test
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/whitelist-source-range: '10.0.0.0/8,X.X.X.X'
spec:
  rules:
    - host: web.manitestdomain.com
      http:
        paths:
          - backend:
              serviceName: service
              servicePort: 80

And testing configuration:

$ curl ipinfo.io/ip
X.X.X.X

Then:

$ curl -I web.manitestdomain.com
HTTP/1.1 403 Forbidden
Server: openresty/1.15.8.2
Date: Mon, 02 Mar 2020 12:45:24 GMT
Content-Type: text/html
Content-Length: 159
Connection: keep-alive
Strict-Transport-Security: max-age=15724800; includeSubDomains

And logs from ingress-controller:

167.71.33.9 - - [02/Mar/2020:12:45:24 +0000] "HEAD / HTTP/1.1" 403 0 "-" "curl/7.65.3" 84 0.000 [service-80] [] - - - - 

So my IP was X.X.X.X and ingress controller received 167.71.33.9.
Why is it happening and how can I fix it?

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1 answer

It looks like theres a blog post here about preserving the clientIP.

https://andrewmichaelsmith.com/2020/02/preserving-client-ip-in-kubernetes/

Hope that helps!

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