Nginx - php fpm max children error

Question

How to fix error in nginx :
- php fpm max children (`server reached pm.max_children setting (5), consider raising it`)

- `(111: Connection refused) while connecting to upstream, client: 172.31.16.34, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://172.17.0.4:8000",`

Accepted Answer

There are some suggestions here https://community.webcore.cloud/tutorials/how_to_solve_php_fpm_server_reached_max_children/

Seems that you want to look in either `/etc/php-fpm.conf` or `/etc/php-fpm.d/[domain.com].conf` for the value assigned to `pm.max_children` and increase this.

Answer

Hello.

> php fpm max children (server reached pm.max_children setting (5), consider raising it)

The value of "pm.max_children" in php-fpm seems to be small, so please try increasing the value.  
I think it's a good idea to calculate this value based on the instance's memory size and the average memory usage of php-fpm.  
https://www.php.net/manual/en/install.fpm.configuration.php

I often use the calculation method below.  
```
pm.max_children = available memory of instance / average memory usage of php-fpm process
```

> (111: Connection refused) while connecting to upstream, client: 172.31.16.34, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://172.17.0.4:8000",

You are trying to connect to "fastcgi://172.17.0.4:8000", but please check if this IP address is correct and if this IP address is listening on port 8000.

Nginx - php fpm max children error

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