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In recent month, there are frequent customer service calls to complain about 502errors on the page. At first, I thought it was a problem of running the game program (because it is useless to restart the php-fpm process, it can only be restored by restarting the game). Later, the situation became serious: even the forum had 502errors. In order not to wait for the leader to invite tea, I quickly checked the nginx log and found all kinds of errors in the past few days. 111104: Connection reset by peer

[error] 31329: * 1027762 connect () failed (111l: Connection refused) while connecting to upstream .upstream: "fastcgi://127.0.0.1:9000",.

Roughly, the php timeout setting is too small, and the nginx fastcgi cache setting is too small.

Later, I checked the nginx configuration, fastcgi_buffers and connection timeout, which are all default configurations. The php-fpm.conf timeout was also set for 30s. I felt that I was trapped by php development and the original OPS. I changed these things decisively and cruelly as follows:

Add in the nginx.conf http section

Fastcgi_connect_timeout 300 is fastcgitized, sendings, timeout 300, fastcgigs readout 300, fastcgigs, buffers, buffers.

Put request_terminate_timeout = 300 in php-fpm.conf

The php-fpm timeout setting here is a little larger, so let's set it according to the actual situation.

Description:

Fastcgi_connect_timeout specifies the timeout for connecting to the backend FastCGI

Fastcgi_send_timeout specifies the timeout for delivering the request to FastCGI

Fastcgi_read_timeout specifies the timeout for receiving FastCGI replies

Fastcgi_buffers 464k sets up four buffers, each 64k, with a total size of (4x1) * 64k. The default is 4k or 8k consistent with the page size of the system.

Function: if a PHP script produces a page size of 256KB, it will be allocated 4 64KB buffers to cache; if the page size is larger than 256KB, the parts larger than 256KB will be cached in the file path specified by fastcgi_temp

Fastcgi_buffer_size 64k refers to the buffer size of the header corresponding to the FastCGI server, which is usually the same as a buffer size of fastcig_buffers.

The default value of fastcgi_busy_buffers_size is twice that of fastcgi_buffers

Fastcgi_temp_file_write_size indicates the size of the data block used when writing to the cache file, and the default value is twice that of fastcgi_buffers

The execution time of request_terminate_timeout php timed out, which can solve the problem of Connection reset by peer

Restart php-fpm restart nginx

The above is all the contents of the article "sample Analysis of php-fpm 502 bad gateway error handling". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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