nginx.conf

location ~ \.php {
  try_files $uri $uri /index.php =404;
  fastcgi_pass 127.0.0.1:9081;
  fastcgi_buffers 16 256k;
  fastcgi_buffer_size 256k;
  fastcgi_index index.php;
  fastcgi_read_timeout 30;
  fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  include fastcgi_params;
}

php81-default-ubuntu2204

[php81]
user                          = nginx
group                         = nginx
listen                        = 127.0.0.1:9081
listen.owner                  = nginx
listen.group                  = nginx

pm                            = ondemand
pm.max_children               = 5000
pm.process_idle_timeout       = 15s;
pm.max_requests               = 256

slowlog                       = /var/log/php/8.1/slow.log
request_slowlog_timeout       = 8s
request_terminate_timeout     = 15s

env[HOSTNAME]                 = $HOSTNAME
env[PATH]                     = /usr/local/bin:/usr/bin:/bin
env[TMP]                      = /tmp
env[TMPDIR]                   = /tmp
env[TEMP]                     = /tmp

php_admin_value[error_log]    = /var/log/php/8.1/www.log
php_admin_flag[log_errors]    = on
php_admin_value[memory_limit] = 1024M