FPM

FastCGI Process Manager

Links

• Documentation
• Switching to FPM on Ubuntu/Debian

Tuning php-fpm

Links

• php-fpm settings calculator
• An Introduction to PHP-FPM Tuning

Monitoring PHP-FPM

• https://www.php.net/manual/en/fpm.status.php
• Zabbix monitoring php-fpm
• zabbix php fpm
• fpm status

fpm configuration

pm.status_listen = 127.0.0.1:9001
pm.status = /fpm-status
pm.ping = /fpm-ping

Apache

1. I suppose you don't really have to use separate port for this, but might avoid problems

Listen 127.0.0.1:89
<Virtualhost 127.0.0.1:89>
 <Location /fpm-status>
   Require host localhost
   ProxyPass unix:/run/php/php-fpm.sock|fcgi://localhost:9001
 </Location>
 <Location /fpm-ping>
   Require host localhost
   ProxyPass unix:/run/php/php-fpm.sock|fcgi://localhost:9001
 </Location>
</VirtualHost>

HOWTO

Configuring number of servers

• An Introduction to PHP-FPM Tuning

  dynamic - the number of child processes are set dynamically based on the
            following directives:
            pm.max_children      - the maximum number of children that can
                                   be alive at the same time. Has to be at least as high as pm.max_spare_servers

            pm.start_servers     - the number of children created on startup.
                                   this value must not be less than min_spare_servers 
                                   and not greater than max_spare_servers.

            pm.min_spare_servers - the minimum number of children in 'idle'
                                   state (waiting to process). If the number
                                   of 'idle' processes is less than this
                                   number then some children will be created.

            pm.max_spare_servers - the maximum number of children in 'idle'
                                   state (waiting to process). If the number
                                   of 'idle' processes is greater than this
                                   number then some children will be killed.

FAQ

error messages

pm.min_spare_servers(3) and pm.max_spare_servers(7) cannot be greater than pm.max_children(5)

Obviously, pm.max_children has to be at least as high as pm.max_spare_servers

proxy_fcgi AH01071: Got error 'Primary script unknown'

The fcgi 404, so you're requesting a nonexisting link

AH01079: failed to make connection to backend: httpd-UDS

USB = Unix Domain Socket, look for logging/config about the socket involved

WARNING: [pool www] ACL set, listen.owner = 'apache' is ignored

Redhat feature, check commenting out acl_users in www.conf

AH01144: No protocol handler was valid for the URL /fpm-ping (scheme 'fcgi').

If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

a2enmod proxy_fcgi

Show php-fpm config

php-fpm8.0 -tt