在server段外面自定义一个日志格式
log_format cdn ‘$http_x_forwarded_for – $remote_user [$time_local] ‘
                    ‘”$request” $status $body_bytes_sent ‘
                    ‘”$http_referer” “$http_user_agent”‘;
修改对应虚拟机的 access_log  /home/wwwlogs/xxxx.log; 为 access_log  /home/wwwlogs/xxxx.log cdn;
重启nginx就行了