Nginx failed to configure reverse proxy

the server is the centos7.0 server component is nginx

when configuring a reverse proxy, if you want to add this line in the red box,
will report an error. How to solve this problem

Mar.18,2021

proxy_pass replace this line with

set         $admintest "admintest.happymall.com";
resolver    114.114.114.114;
proxy_pass  http://$admintest;
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3c3c5-4469b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3c3c5-4469b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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