Nginx Connect () to Unix:/var/run/php-fpm.sock failed (11:resource temporarily unavailable) _nginx

The site often appears 502 Bad gateway, the program is no problem.

According to the Nginx log:

Copy Code code as follows:

Connect () to Unix:/var/run/php-fpm.sock failed (11:resource temporarily unavailable)

It was found that the PHPFPM listen was run by Unix sock, and the problem could be on the PHP fpm. PHP fpm configuration file has Backlog,backlog is the Linux server in the socket processing connection number definition, PHPFPM defaults to-1, will be 1 to 4096, restart the PHP fpm problem resolution.