nginx warn an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/ while reading upstream
最近管理的nginx发现大量的error log，log内容如下：
an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/0/52/0002923520 while reading upstream
从这条error日志来看是nginx某一块的buffer设置的太小，而response（包含response header和response body）导致response结果不得不临时写到文件中。
可以修改的配置参数
client_header_buffer_size 128k;
client_body_buffer_size 1m;
proxy_buffer_size 32k;
proxy_buffers 64 32k;
proxy_busy_buffers_size 1m;
proxy_temp_file_write_size 512k;
经过这样的配置调整之后，基本上没有这样的error日志了。
关于这几个配置的官方文档链接如下
http://nginx.org/en/docs/http/ngx_http_core_module.html#directives
http://nginx.org/en/docs/http/ngx_http_proxy_module.html#directives
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