kubectl get cm nginx-configuration -n kube-system -o yaml
apiVersion: v1
data:
  allow-backend-server-header: "true"
  enable-underscores-in-headers: "true"
  generate-request-id: "true"
  ignore-invalid-headers: "true"
  log-format-upstream: $remote_addr - [$remote_addr] - $remote_user [$time_local]
    "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" $request_length
    $request_time [$proxy_upstream_name] $upstream_addr $upstream_response_length
    $upstream_response_time $upstream_status $req_id $host [$proxy_alternative_upstream_name]
  max-worker-connections: "65536"
  proxy-body-size: 20m
  proxy-connect-timeout: "10"
  reuse-port: "true"
  server-tokens: "false"
  ssl-redirect: "false"
  upstream-keepalive-timeout: "900"
  use-forwarded-headers: "true"
  worker-cpu-affinity: auto
kind: ConfigMap
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","data":{"allow-backend-server-header":"true","enable-underscores-in-headers":"true","generate-request-id":"true","ignore-invalid-headers":"true","log-format-upstream":"$remote_addr - [$remote_addr] - $remote_user [$time_local] \"$request\" $status $body_bytes_sent \"$http_referer\" \"$http_user_agent\" $request_length $request_time [$proxy_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status $req_id $host [$proxy_alternative_upstream_name]","max-worker-connections":"65536","proxy-body-size":"20m","proxy-connect-timeout":"10","reuse-port":"true","server-tokens":"false","ssl-redirect":"false","upstream-keepalive-timeout":"900","worker-cpu-affinity":"auto"},"kind":"ConfigMap","metadata":{"annotations":{},"labels":{"app":"ingress-nginx"},"name":"nginx-configuration","namespace":"kube-system"}}
  creationTimestamp: "2021-01-26T02:56:20Z"
  labels:
    app: ingress-nginx
  name: nginx-configuration
  namespace: kube-system
  resourceVersion: "382818535"
  selfLink: /api/v1/namespaces/kube-system/configmaps/nginx-configuration
  uid: 453cd84a-e773-492e-8a5e-2439d3836ed3

添加
use-forwarded-headers: "true"

官网(抽时间熟读)

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#use-forwarded-headers

https://blog.csdn.net/felix_yujing/article/details/106616962

https://www.cnblogs.com/klvchen/p/13718265.html

https://www.cnblogs.com/dev0ps/p/12622979.html

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