max connect php fpm

This happens because the operating system rejects nginx’s attempts to connect to a unix socket.

The reason is either the maximum number of socket connections or the maximum number of unhandled socket connections has been exceeded.

Checking the limits:

sysctl net.core

We are interested in the lines:

net.core.somaxconn = 128
net.core.netdev_max_backlog = 200

Because of them, an error occurs, since the maximum number of connections is 128 and the maximum number of unprocessed is 200

Change the limits, write the lines in the / etc / sysctl.conf file

nano /etc/sysctl.conf

add

net.core.somaxconn = 20000
net.core.netdev_max_backlog = 65535

Apply parameters

sysctl -p

Restart php-fpm

service php-fpm restart