低资源服务器架构优化：2核512M极致方案

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# /etc/nginx/nginx.conf - 2核512M专用配置
worker_processes 2;          # 匹配CPU核心数
worker_rlimit_nofile 1024;   # 文件描述符上限

events {
    worker_connections 512;   # 单worker最大并发连接
    use epoll;                # Linux高性能事件模型
    multi_accept on;          # 一次性接受所有新连接
}

http {
    # 连接优化
    sendfile on;              # 零拷贝传输
    tcp_nopush on;            # 优化数据包发送
    tcp_nodelay on;           # 禁用Nagle算法
    keepalive_timeout 30;     # 长连接超时
    keepalive_requests 1000;  # 单连接最大请求数

    # 缓冲区优化 - 小内存关键配置
    client_body_buffer_size 1K;
    client_header_buffer_size 1K;
    client_max_body_size 2m;
    large_client_header_buffers 2 1K;

    # 压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 256;
    gzip_types text/plain text/css application/json
               application/javascript text/xml
               application/xml text/markdown;

    # Brotli预压缩（如果安装了ngx_brotli模块）
    brotli_static on;
    brotli on;
    brotli_types text/plain text/css application/json
                 application/javascript text/xml
                 application/xml text/markdown;

    # 连接限制
    limit_conn_zone $binary_remote_addr zone=connlimit:1m;
    limit_conn connlimit 20;

    # 速率限制
    limit_req_zone $binary_remote_addr zone=ratelimit:1m rate=10r/s;
    limit_req zone=ratelimit burst=20 nodelay;
}

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server {
    listen 80;
    server_name airef.dev;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name airef.dev;

    # SSL - 最小内存配置
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:1m;     # 1MB共享缓存
    ssl_session_timeout 1h;
    ssl_session_tickets off;

    # 根目录
    root /var/www/airef.dev/public;
    index index.html;

    # AI发现文件 - 直接返回
    location = /llms.txt {
        default_type text/plain;
        add_header Cache-Control "public, max-age=3600";
    }

    location = /llms-full.txt {
        default_type text/plain;
        add_header Cache-Control "public, max-age=3600";
    }

    location = /robots.txt {
        default_type text/plain;
        add_header Cache-Control "public, max-age=86400";
    }

    location = /sitemap.xml {
        default_type application/xml;
        add_header Cache-Control "public, max-age=3600";
    }

    # 静态文件 - 强缓存
    location ~* \.(html|css|js|svg|png|jpg|webp|woff2)$ {
        expires 7d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # 其他请求 - 兜底
    location / {
        try_files $uri $uri/ $uri.html =404;
        add_header X-Content-Type-Options nosniff;
        add_header X-Frame-Options DENY;
    }
}

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# 创建1GB swap文件
sudo fallocate -l 1G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

# 调整swappiness - 尽量少用swap
echo 'vm.swappiness=10' | sudo tee -a /etc/sysctl.conf
sudo sysctl -p

# 永久挂载
echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

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# 查看内存占用
ps aux --sort=-%mem | head -20

# 禁用不需要的服务（根据实际情况调整）
sudo systemctl disable bluetooth
sudo systemctl disable cups
sudo systemctl disable avahi-daemon
sudo systemctl disable ModemManager