配置ingress uuid字段

需要把cookie字段添加到日志中方便业务分析，方法和nginx配置差不多

修改ingres configmap文件 json日志格式添加自定义的cookie字段”user_id”: “$affefdgx_id”}

apiVersion: v1
data:
  log-format-upstream: '{"time": "$time_iso8601","remote_addr": "$remote_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":
    "$http_user_agent","user_id": "$affefdgx_id"}'
kind: ConfigMap
metadata:
  annotations:
  labels:
    app: ingress-nginx
  name: nginx-configuration
  namespace: ingress-nginx

修改ingress对象 通过annotations的nginx.ingress.kubernetes.io/server-snippet:

nginx.ingress.kubernetes.io/server-snippet: |
        set $affefdgx_id "-";
        if ( $http_cookie ~* "affefdgx=(\S+)(;.*|$)"){
            set $affefdgx_id $1;
        }

获取ingress-nginx记录用户请求Header
把自定义头部加入日志

参数详解 
 
http://nginx.org/en/docs/http/ngx_http_core_module.html#var_cookie_ 
$http_NAME  #匹配任意请求头字段；变量名中的后半部分NAME可以替换成任意请求头字段，如在配置文件中需要获取http请求头："Accept-Language"，$http_accept_language即可 
可在自定义header字段前加http_，即可将指定的自定义header字段打印到log中 

apiVersion: v1
data:
  log-format-upstream: '{"time": "$time_iso8601","remote_addr": "$remote_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":
    "$http_user_agent","wx_uuid":"$http_useruuid"}'
kind: ConfigMap