在/etc/nginx/conf.d/default.conf 配置变量
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server{if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})"){  set $year $1;  set $month $2;  set $day $3;  }} | 
然后在nginx.conf里面配置日志格式
http{
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log_format custom_log ‘[$time_local] $request_time $remote_addr $proxy_add_x_forwarded_for $status $request_method http://$host$request_uri $server_protocol $bytes_sent DIRECT/$upstream_addr $sent_http_content_type "$http_referer" "$http_user_agent" $upstream_response_time $upstream_status -‘;access_log /innfotech/log/nginx/access.log_$year$month$day  custom_log; | 
}