Ingress Behind Another Load Balancer

If a load balancer in front of the Nginx Ingress Controller offloads TLS or sets X-Forwarded-* headers, enable use-forwarded-headers=true. Without it, Nginx overwrites those headers with the values it receives from the external load balancer.

Run the following commands to enable the option.

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx 
helm repo update 
kubectl create namespace ingress-nginx
 helm upgrade --install ingress-nginx --namespace ingress-nginx ingress-nginx/ingress-nginx --set-string controller.config.use-forwarded-headers=true

Alternatively, create a values.yaml file with the following content and install nginx-ingress with it.

controller:
  config:
    use-forwarded-headers: "true"

Run the following commands after creating values.yaml.

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx 
helm repo update 
kubectl create namespace ingress-nginx
helm upgrade --install ingress-nginx --namespace ingress-nginx ingress-nginx/ingress-nginx -f values.yaml