nginx代理後寫入上傳一直提示13: Permission denied

nginx提示：

2020/04/30 16:51:48 [crit] 21376#0: *10809 open() "/usr/local/webserver/nginx/client_body_temp/0000000021" failed (13: Permission denied), client: 222.128.117.34, server: www.appianway.cn, request: "POST xxxxxxxxxxxxx/uploadTempOpen HTTP/1.1", host: "xxxxxxxxxn:8908", referrer: "xxxxxxxxxxxxxxxxl/index.html"

一直提示無權限，發現nginx啓動進程的主進程是root，可是子進程都是未知nobody：

[root@zyyd ~]# ps -ef|grep nginx


root     21375     1  0 14:18 ?        00:00:00 nginx: master process /usr/local/webserver/nginx/sbin/nginx -c /usr/local/webserver/nginx/conf/nginx_ssl.conf
nobody   21376 21375  0 14:18 ?        00:00:02 nginx: worker process
nobody   21377 21375  0 14:18 ?        00:00:02 nginx: worker process

修改nginx配置：第一行

#user xxxx xxxxx
user root root;