Opened 3 years ago
Closed 3 years ago
#2085 closed enhancement (duplicate)
The relationship between directive "fastcgi_busy_buffers_size" and other two directives is not recorded clearly.
| Reported by: | Owned by: | ||
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| Priority: | minor | Milestone: | |
| Component: | documentation | Version: | 1.18.x |
| Keywords: | Cc: | zhoushulin1992@… | |
| uname -a: | Linux xlarge 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux | ||
| nginx -V: |
nginx version: nginx/1.18.0
built by gcc 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1) configure arguments: --prefix=/usr/local/nginx --with-pcre=/root/Downloads/pcre-8.43 |
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Description
In the document of directive "fastcgi_busy_buffers_size", it says that "By default, size is limited by the size of two buffers set by the fastcgi_buffer_size and fastcgi_buffers directives". Indeed, based on the handling logic in src/http/modules/ngx_http_fastcgi_module.c, the value of "fastcgi_busy_buffers_size" must be equal or greater than the maximum of the value of "fastcgi_buffer_size" and "fastcgi_buffers" size. So it is recommended to add this information in the doc of "fastcgi_busy_buffers_size"(https://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_busy_buffers_size).
The same situation happens in directive "fastcgi_temp_file_write_size" in https://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_temp_file_write_size, and directive "fastcgi_max_temp_file_size" in https://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_max_temp_file_size. They should all be equal or greater than the maximum of the value of "fastcgi_buffer_size" and "fastcgi_buffers" size.
What's more, the value of directive "fastcgi_busy_buffers_size" must be less than (number-of-fastcgi_buffers - 1)*size-of-fastcgi_buffers. This also should be recorded.
Closing this as duplicate of #2086, which is more generic, as applies to proxy.