配置Nginx Ingress Controller获取客户端真实IP

方法一，在对应 Ingress 添加注解：

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: cafe-ingress-with-annotations
  annotations:
    nginx.org/compute-full-forwarded-for: "true"
    nginx.org/forwarded-for-header: "X-Forwarded-For"
    nginx.org/use-forwarded-headers: "true"
    ...

方法二，编辑 Ingress Controller 的公共 ConfigMap：

$ kubectl get cm -n ingress <cm_name> -o yaml
apiVersion: v1
data:
  compute-full-forwarded-for: "true"
  forwarded-for-header: "X-Forwarded-For"
  use-forwarded-headers: "true"
  ...
kind: ConfigMap
metadata:
  annotations:
  ...

Nginx Ingress Controller 所有可配置的字段可参考：

• https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/