Nginx and PHP FPM Tuning Guide for High Traffic Performance

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Nginx and PHP FPM Tuning Guide for High Traffic Performance

If you are searching for how to optimise Nginx and PHP FPM for production traffic, focus on configuration first. Defaults are safe, not fast. Below are production ready snippets you can review, adjust, and deploy.

Worker and Connection Limits

Set concurrency correctly before tuning anything else.

worker_processes auto;

worker_connections 1024;

multi_accept on;

ulimit -n 65535

Timeout Configuration

Prevent slow clients from blocking workers.

client_header_timeout 10s;

client_body_timeout   10s;

send_timeout          10s;

keepalive_timeout     15s;

fastcgi_connect_timeout 5s;

fastcgi_send_timeout    30s;

fastcgi_read_timeout    60s;

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Gzip Compression

Enable compression to reduce payload size.

gzip on;

gzip_vary on;

gzip_min_length 1024;

Buffer Configuration

Control memory usage and request handling.

client_body_buffer_size 15k;

client_header_buffer_size 2k;

client_max_body_size 8m;

large_client_header_buffers 4 4k;

File Cache Optimisation

Reduce disk I O overhead.

open_file_cache max=2000 inactive=20s;

open_file_cache_valid 60s;

open_file_cache_min_uses 5;

open_file_cache_errors off;

Static Asset Caching

Avoid repeated backend hits.

location /static/ {

root /var/www/site;

expires max;

add_header Cache-Control "public, immutable";

}

FastCGI Cache for Dynamic Content

Bypass cache when needed.

set $skip_cache 0;

if ($request_method = POST) { set $skip_cache 1; }

if ($query_string != "")   { set $skip_cache 1; }

if ($http_cookie ~* "session|logged_in") { set $skip_cache 1; }

fastcgi_cache_path /var/cache/nginx/php levels=1:2 keys_zone=phpcache:100m inactive=60m max_size=1g;

location ~ \.php$ {

include fastcgi_params;

fastcgi_pass unix:/run/php/php-fpm.sock;

fastcgi_index index.php;

fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

fastcgi_cache phpcache;

fastcgi_cache_valid 200 301 302 10m;

fastcgi_cache_valid 404 1m;

fastcgi_cache_use_stale error timeout updating;

fastcgi_cache_bypass $skip_cache;

fastcgi_no_cache     $skip_cache;

}

PHP FPM Production Pool

Tune process management based on memory capacity.

pm = dynamic

pm.max_children = 100

pm.start_servers = 10

pm.min_spare_servers = 10

pm.max_spare_servers = 30

pm.max_requests = 500

request_terminate_timeout = 120s

request_slowlog_timeout = 5s

slowlog = /var/log/php-fpm/slow.log

rlimit_files = 65536

listen.backlog = 8192

catch_workers_output = yes

php_admin_value[opcache.enable] = 1

php_admin_value[opcache.memory_consumption] = 256

php_admin_value[opcache.interned_strings_buffer] = 32

php_admin_value[opcache.max_accelerated_files] = 100000

php_admin_value[opcache.validate_timestamps] = 0

ECC SSL Key Generation

Reduce handshake overhead under HTTPS load.

openssl ecparam -out ./nginx-ecc-p256.key -name prime256v1 -genkey

openssl req -new -key ./nginx-ecc-p256.key -out ./nginx-ecc-p256-csr.pem -subj '/CN=localhost'

openssl req -x509 -nodes -days 30 -key ./nginx-ecc-p256.key -in ./nginx-ecc-p256-csr.pem -out ./nginx-ecc-p256.pem

Conclusion

Real performance comes from precise configuration, not bigger hardware. Review your current setup, apply the relevant tuning blocks, and validate results with load testing.

If you are preparing for higher traffic, start implementing these changes now and download the complete optimisation checklist to harden your production stack.