nginx.conf

worker_processes auto;
worker_rlimit_nofile 32768;
# worker_rlimit_nofile 20000;

events {
    worker_connections 16384;  # Adjusted to fit within memory constraint
    # worker_connections 20000;  # Adjusted to fit within memory constraint
    multi_accept on;           # Enable multiple accept calls to handle more connections efficiently
    use epoll;                 # Use epoll event notification mechanism for better performance on Linux
}

http {
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 5; # Reduced to reclaim connections faster

    # Buffer sizes reduced to fit within memory constraint
    # client_body_buffer_size 4k;
    # client_max_body_size 10m;
    # client_header_buffer_size 1k;
    # large_client_header_buffers 2 1k;
    client_body_buffer_size 2k;
    client_max_body_size 2k;
    client_header_buffer_size 1k;
    large_client_header_buffers 2 1k;

    # Disable logging or set to a minimal level
    access_log off;            # Turn off access logging to save resources
    # error_log /var/log/nginx/error.log crit;  # Set error log level to 'crit' for critical errors only

    # Gzip compression disabled due to memory constraint
    gzip off;

    # Load balancing configuration for API servers
    upstream api {
        server api01:8080;
        server api02:8080;
        keepalive 500;
    }

    server {
        listen 9999; # Lembra da porta 9999 obrigatória?
        
        location / {
            proxy_pass http://api;
            proxy_http_version 1.1;

            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            # proxy_set_header Connection "";
            # proxy_set_header Keep-Alive "";
            # proxy_set_header Proxy-Connection "keep-alive";

            # Buffer requests and responses above a certain size
            proxy_buffering on;
            proxy_buffer_size 12k;   # Buffer size for proxied request or response
            proxy_buffers 4 8k;      # Number and size of buffers for proxied request or response
            # proxy_buffering off;
        }
    }
}