You can follow the below instruction, please kindly check,
# PHP-FPM Configuration for AlmaLinux 8.10 with OnDemand
## Server Specifications Analysis
– CPU: Intel(R) Xeon(R) Gold 6354 @ 3.00GHz (24 cores)
– RAM: 19.32 GiB total
– PHP Version: 7.4.33
– Process Manager: OnDemand
## PHP-FPM Pool Configuration (/etc/php-fpm.d/www.conf)
; Process Manager Configuration
pm = ondemand
pm.max_children = 120 ; 24 cores * 5 = optimal for your CPU
pm.process_idle_timeout = 10s ; Timeout for idle processes
pm.max_requests = 500 ; Restart workers after this many requests
pm.status_path = /status ; Enable status page for monitoring
; Performance Tuning
pm.max_spawn_rate = 32 ; Max number of processes to spawn at once
pm.max_requests = 500 ; Prevent memory leaks by recycling processes
emergency_restart_threshold = 10
emergency_restart_interval = 1m
; Resource Limits
php_admin_value[memory_limit] = 256M
php_admin_value[max_execution_time] = 300
php_admin_value[max_input_time] = 300
php_admin_value[post_max_size] = 64M
php_admin_value[upload_max_filesize] = 64M
; Connection Settings
listen.backlog = 511
request_terminate_timeout = 300s
rlimit_files = 65535
; Logging Settings
slowlog = /var/log/php-fpm/slow.log
request_slowlog_timeout = 10s
catch_workers_output = yes
php_admin_flag[log_errors] = on
php_admin_value[error_log] = /var/log/php-fpm/www-error.log
## PHP OpCache Settings (/etc/php.ini)
[opcache]
opcache.enable=1
opcache.memory_consumption=256
opcache.interned_strings_buffer=16
opcache.max_accelerated_files=8000
opcache.revalidate_freq=60
opcache.fast_shutdown=1
opcache.enable_cli=1
opcache.optimization_level=0x7FFFBFFF
opcache.validate_timestamps=1
## System Settings (/etc/sysctl.conf)
# File descriptor limits
fs.file-max = 65535
# TCP settings for better performance
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_max_syn_backlog = 4096
net.core.somaxconn = 65535
## Implementation Steps
1. Backup existing configuration:
sudo cp /etc/php-fpm.d/www.conf /etc/php-fpm.d/www.conf.backup
sudo cp /etc/php.ini /etc/php.ini.backup
2. Apply new settings:
sudo systemctl restart php-fpm
sudo systemctl restart httpd
3. Monitor the changes:
# Monitor PHP-FPM processes
watch -n1 “ps aux | grep php-fpm | wc -l”
# Check PHP-FPM status
systemctl status php-fpm
# Monitor error log
tail -f /var/log/php-fpm/error.log
## Explanation of Key Settings
1. **Process Manager Settings**
– pm = ondemand: Spawns processes only when needed
– pm.max_children = 120: Based on 24 cores * 5 (can be adjusted based on memory usage)
– pm.process_idle_timeout = 10s: Kill idle processes after 10 seconds to free resources
2. **Memory Calculations**
– Available RAM: 19.32 GB
– Per-process memory limit: 256MB
– Max theoretical processes: (19.32 GB * 0.7) / 256MB β 52
– We set max_children below this at 120 considering CPU cores
3. **Performance Optimizations**
– Increased file descriptors limit
– Optimized TCP settings
– Enhanced OpCache configuration
## Monitoring Recommendations
1. Set up monitoring for:
– Number of active PHP-FPM processes
– Memory usage per process
– Slow request logs
– Error logs
2. Create monitoring alerts for:
– PHP-FPM process count near max_children
– High memory usage
– Increased error rates
## Fine-Tuning Guidelines
1. Monitor slow.log for requests taking longer than 10s
2. Adjust pm.max_children if memory usage is too high
3. Increase memory_limit if seeing memory-related errors
4. Watch for TCP connection issues in Apache logs
## Additional Recommendations
1. Implement request rate limiting in Apache/Nginx
2. Consider implementing a CDN for large downloads
3. Use Redis/Memcached for session handling
4. Enable HTTP/2 in Apache for better concurrent downloads
Please kindly check and let me know.
Thank you and kind regards
