k8s 应用程序获取真实来源ip

主要修改：nginx-configuration

 kubectl get   cm -n ingress-nginx    nginx-configuration      -o yaml
apiVersion: v1
data:
  log-format-upstream: '{ "time": "$time_iso8601", "remote_addr": "$proxy_protocol_addr","x-forward-for":
    "$proxy_add_x_forwarded_for", "request_id": "$req_id", "remote_user":"$remote_user",
    "bytes_sent": $bytes_sent, "request_time": $request_time, "status":$status, "vhost":
    "$host", "request_proto": "$server_protocol", "path": "$uri","request_query":
    "$args", "request_length": $request_length, "duration": $request_time,"method":
    "$request_method", "http_referrer": "$http_referer", "http_user_agent":"$http_user_agent"
    }'
  use-forwarded-headers: "true"
kind: ConfigMap
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","kind":"ConfigMap","metadata":{"annotations":{},"labels":{"app.kubernetes.io/name":"ingress-nginx","app.kubernetes.io/part-of":"ingress-nginx"},"name":"nginx-configuration","namespace":"ingress-nginx"}}
  creationTimestamp: "2020-08-03T04:49:35Z"
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
  name: nginx-configuration
  namespace: ingress-nginx
  resourceVersion: "35168897"
  selfLink: /api/v1/namespaces/ingress-nginx/configmaps/nginx-configuration
  uid: 824c5020-5a65-44aa-9dd8-0b71070ce68e


配置文件增加的内容为：
data:
  log-format-upstream: '{ "time": "$time_iso8601", "remote_addr": "$proxy_protocol_addr","x-forward-for":
    "$proxy_add_x_forwarded_for", "request_id": "$req_id", "remote_user":"$remote_user",
    "bytes_sent": $bytes_sent, "request_time": $request_time, "status":$status, "vhost":
    "$host", "request_proto": "$server_protocol", "path": "$uri","request_query":
    "$args", "request_length": $request_length, "duration": $request_time,"method":
    "$request_method", "http_referrer": "$http_referer", "http_user_agent":"$http_user_agent"
    }'
  use-forwarded-headers: "true"