Nginx php-fpm unixsocket concurrency 100 or more 502 solutions

Nginx php-fpm with the UNIX socket, when the concurrency reached more than 100 is, will report 502 errors, change to TCP mode without this problem

Originally with UNIX socket is to improve performance, but does not support large concurrency, the discovery is the system kernel limit caused by instability, modify the following kernel parameters to resolve

Adjust the following parameters sysctl.conf

Net.unix.max_dgram_qlen = 4096net.core.netdev_max_backlog = 4096net.core.somaxconn = 4096

Php-fpm.conf

Listen.backlog = 4096

Reference: http://forum.nginx.org/read.php?11,215606,215606#msg-215606

This article is from the "Zhou Failong" blog, make sure to keep this source http://zhoufayong.blog.51cto.com/866021/1636518

Nginx php-fpm unixsocket concurrency 100 or more 502 solutions