Load Balancer does not forward source ip

Question

I have a service in a kubernetes cluster exposed through a load balancer. However, the load balancer is not correctly forwarding request headers to Kubernetes. For instance X-Forwarded-For contains the load balancer’s private IP address 10.X.X.X when it should have been [ClientIP],[LoadBalancerPrivateIP]. This is not due to the kubernetes routing controller, because when the service is exposed with an Ingress Controller I am getting all the headers correctly filled.

my kubernetes service definition is the following

apiVersion: v1
kind: Service
metadata:
  name: myservice
  labels:
    app: myapp
spec:
  ports:
  - port: 80
    targetPort: 5000
    protocol: TCP
    name: http
    type: LoadBalancer
  selector:
    app: myapp

Can someone please help out on this?

Gisleburt · Answer

This might be too late for you but perhaps it will help others.

In theory, you should be able to resolve this by setting service.spec.externalTrafficPolicy to Local, example below. However, this only seems to work with some vendors (Google Cloud, Azure). I’ve tried it in DO and it doesn’t seem to work unfortunately.

---
kind: Service
apiVersion: v1
metadata:
  name: traefik-ingress-service
  namespace: public
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - protocol: TCP
      port: 80
      name: http
    - protocol: TCP
      port: 443
      name: https
    - protocol: TCP
      port: 8080
      name: admin
  type: LoadBalancer
  externalTrafficPolicy: Local

I’ll update if I find anything.

brunokakele · Answer

It still doesn’t work. Another thread with the same issue: https://www.digitalocean.com/community/questions/transparent-load-balancers

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Load Balancer does not forward source ip

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