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

nginx upstream response is buffered to a temporary file wordpress

especially while i am clicking on publish because response size big, its normal.

fastcgi_buffer_size 4K;
fastcgi_buffers 64 4k;

Fastcgi buffer will store responses up to 4K+64*4K=260K in memory

So when the request is out of in-memory buffer, data will be saved into files.

Don’t worry it’s not a problem.

#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$ {

To disable FastCGI disk buffering and get rid of all the an upstream response is buffered to a temporary file errors add this line:

fastcgi_max_temp_file_size 0;

location ~ \.php$ { root /usr/share/nginx/html; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_max_temp_file_size 0; fastcgi_buffer_size 4K; fastcgi_buffers 64 4k; include fastcgi_params; }

Enables or disables buffering of responses from the FastCGI server.

Syntax:	`fastcgi_buffering on \| off;`
Default:	fastcgi_buffering on;
Context:	`http`, `server`, `location`

This directive appeared in version 1.5.6.

When buffering is enabled, nginx receives a response from the FastCGI server as soon as possible, saving it into the buffers set by the fastcgi_buffer_size and fastcgi_buffers directives. If the whole response does not fit into memory, a part of it can be saved to a temporary file on the disk. Writing to temporary files is controlled by the fastcgi_max_temp_file_size and fastcgi_temp_file_write_size directives.

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

increasing fast cgi buffers

By default, the buffer size is equal to one memory page. This is either 4K or 8K, depending on a platform.

fastcgi_buffers 8 32k;
fastcgi_buffer_size 32k;
fastcgi_busy_buffers_size 64k;

deafult values

Syntax:	`fastcgi_buffersnumbersize;`
Default:	fastcgi_buffers 8 4k\|8k;

Syntax:fastcgi_buffer_sizesize;
Default:

fastcgi_buffer_size 4k|8k;

Context:http, server, location

increased to

fastcgi_buffers 16 64k;
fastcgi_buffer_size 64k;
fastcgi_busy_buffers_size 128k;

nginx: [emerg] “fastcgi_busy_buffers_size” must be equal to or greater than the maximum of the value of “fastcgi_buffer_size” and one of the “fastcgi_buffers” in /etc/nginx/nginx.conf:136

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.

wordpress slow and upstream response is buffered to a temporary file

solution 1: dsiable buffering to disk.

fastcgi_max_temp_file_size 0;

disable buffering

fastcgi_buffering off;

increase buffers

http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_buffer_size

I’ve set proxy_max_temp_file_size to 0 and still get the warnings. I have oodles of spare memory, what should I change to utilise it and avoid this message?

we tested no error make sure check the string fastcgi or proxy buffer.