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RAaz Kumar .com

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nginx upstream response is buffered to a temporary file

an upstream response is buffered to a temporary file  /var/cache/nginx/fastcgi_temp
wp-admin/post.php?post=50097&action=edit HTTP/2.0  (wordpress admin)
Problem:
response was buffered to disk instead of memory.
/var/cache/nginx/fastcgi_temp
#soluttion 1: disable write to disk
2. increase buffers but may not works.

to disable write to disk

fastcgi_max_temp_file 0;
     location ~ \.php$ {

understanding nginx fast cgi buffers

fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;
fastcgi_buffer_size 4K;
fastcgi_buffers 64 4k;
Fastcgi buffer will store responses up to 4K+64*4K=260K in memory
proxy_buffers 16 16k;
proxy_buffer_size 16k;
Writing to temporary files is controlled by the fastcgi_max_temp_file_size and fastcgi_temp_file_write_size directives

fastcgi_buffer_size 4k|8k;

first part of theresponse by fastcgit to read nginx
maximum size of the data that nginx can receive from the server at a time is set by the fastcgi_buffer_size directive
first part of the response received from the FastCGI server
the number and size of the buffers used for reading a response from the FastCGI server, for a single connection.
fastcgi_buffers 8 4k|8k;
number and size of the buffers used for reading a response from the FastCGI server, for a single connection.
8*16k=
fastcgi_busy_buffers_size 8k|16k;
fastcgi_buffers 8 4k|8k;
By default, size is limited by two buffers set by the fastcgi_buffer_size and fastcgi_buffers directives.
fastcgi_max_temp_file_size 1024m; default
Default:
fastcgi_temp_file_write_size 8k|16k;
Limits the size of data written to a temporary file at a time

proxy buffers in nginx

applies to single repsonef rom fastcgi
proxy_buffer_size 256k;
proxy_buffers 8 128k;
proxy_busy_buffers_size 256k;
proxy_max_temp_file_size 2048m;
proxy_temp_file_write_size 2048m;
out the buffer and resulting in a HTTP 500 error. In those instances you will need to increase this buffer to 8k/16k/32k
mycase: wordpress post editing is slow, and error logging nginx log.

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