# /etc/nginx/nginx.conf

user nginx;
worker_processes auto;
worker_rlimit_nofile 65535;

events {
    use epoll;
    worker_connections 65536;
    multi_accept on;
}

http {
    # HTTP配置
}

events {
    use epoll;                  # 使用epoll事件模型
    worker_connections 65536;   # 单进程最大连接数
    multi_accept on;            # 同时接受多个连接
    accept_mutex off;           # 关闭accept互斥锁，提高并发性能
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
    
    # 日志配置
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for" '
                      '$request_time $upstream_response_time';
    
    access_log  /var/log/nginx/access.log  main;
    error_log   /var/log/nginx/error.log   warn;
    
    # 高效传输
    sendfile        on;
    tcp_nopush      on;
    tcp_nodelay     on;
    keepalive_timeout  65;
    keepalive_requests 100;
    
    # 其他配置
    include /etc/nginx/conf.d/*.conf;
}

http {
    # 高效文件传输
    sendfile on;              # 启用sendfile，减少用户空间到内核空间的拷贝
    tcp_nopush on;            # 启用tcp_nopush，与sendfile配合使用
    tcp_nodelay on;           # 启用tcp_nodelay，减少网络延迟
    
    # 连接管理
    keepalive_timeout 65;     # 长连接超时时间
    keepalive_requests 100;    # 长连接最大请求数
    
    # 连接超时
    client_body_timeout 60;    # 客户端请求体超时
    client_header_timeout 60;  # 客户端请求头超时
    send_timeout 60;           # 发送响应超时
}

http {
    # gzip压缩
    gzip on;                  # 启用gzip压缩
    gzip_vary on;             # 启用Vary: Accept-Encoding响应头
    gzip_min_length 1024;     # 最小压缩文件大小
    gzip_comp_level 6;        # 压缩级别（1-9，6为平衡点）
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;  # 压缩文件类型
    gzip_buffers 16 8k;       # 压缩缓冲区
    gzip_http_version 1.1;    # 压缩使用的HTTP版本
    
    # 禁用IE6 gzip
    gzip_disable "MSIE [1-6]\\.";  
}

http {
    # 静态文件缓存
    location ~* \.(jpg|jpeg|png|gif|ico|css|js|woff|woff2|ttf|eot|svg)$ {
        expires 30d;                  # 缓存30天
        add_header Cache-Control "public, immutable";  # 缓存控制
        access_log off;               # 关闭访问日志
        gzip on;                      # 启用gzip压缩
    }
    
    # 代理缓存
    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=my_cache:10m max_size=10g inactive=60m;
    
    location /api/ {
        proxy_pass http://backend;
        proxy_cache my_cache;
        proxy_cache_valid 200 304 10m;
        proxy_cache_valid any 1m;
        proxy_cache_min_uses 1;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;
    }
}

http {
    # 上游服务器
    upstream backend {
        least_conn;  # 最少连接数负载均衡
        server 127.0.0.1:8080 max_fails=3 fail_timeout=30s;
        server 127.0.0.1:8081 max_fails=3 fail_timeout=30s;
        server 127.0.0.1:8082 max_fails=3 fail_timeout=30s;
    }
    
    # 代理配置
    location / {
        proxy_pass http://backend;
        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;
        
        # 代理超时
        proxy_connect_timeout 30s;
        proxy_read_timeout 60s;
        proxy_send_timeout 60s;
        
        # 缓冲区
        proxy_buffers 16 16k;
        proxy_buffer_size 32k;
    }
}

http {
    # 隐藏版本号
    server_tokens off;
    
    # 限制请求方法
    if ($request_method !~ ^(GET|HEAD|POST)$ ) {
        return 405;
    }
    
    # 客户端限制
    client_max_body_size 50m;          # 限制请求体大小
    client_body_buffer_size 16k;       # 请求体缓冲区大小
    
    # 防止点击劫持
    add_header X-Frame-Options SAMEORIGIN;
    
    # 防止XSS攻击
    add_header X-XSS-Protection "1; mode=block";
    
    # 强制HTTPS
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    
    # 内容安全策略
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self';";
}

http {
    # 定义限制区域
    limit_req_zone $binary_remote_addr zone=one:10m rate=10r/s;
    
    # 应用限制
    location / {
        limit_req zone=one burst=20 nodelay;
    }
    
    # API接口限制
    location /api/ {
        limit_req zone=one burst=10 nodelay;
    }
}

http {
    # 图片防盗链
    location ~* \.(jpg|jpeg|png|gif|webp)$ {
        valid_referers none blocked example.com *.example.com;
        if ($invalid_referer) {
            return 403;
        }
    }
}

server {
    listen 443 ssl http2;
    server_name example.com;
    
    # SSL配置
    ssl_certificate /etc/nginx/ssl/example.com.crt;
    ssl_certificate_key /etc/nginx/ssl/example.com.key;
    
    # SSL优化
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    ssl_session_tickets off;
    ssl_stapling on;
    ssl_stapling_verify on;
    resolver 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;
    
    # 其他配置
    location / {
        root /usr/share/nginx/html;
        index index.html index.htm;
    }
}

# 重定向HTTP到HTTPS
server {
    listen 80;
    server_name example.com;
    return 301 https://$host$request_uri;
}

http {
    # 主日志格式
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    '$request_time $upstream_response_time';
    
    # 访问日志
    access_log /var/log/nginx/access.log main;
    
    # 错误日志
    error_log /var/log/nginx/error.log warn;
    
    # 关闭静态文件日志
    location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
        access_log off;
    }
}

# 负载均衡配置
upstream backend {
    least_conn;
    server 10.0.0.1:8080 max_fails=3 fail_timeout=30s;
    server 10.0.0.2:8080 max_fails=3 fail_timeout=30s;
    server 10.0.0.3:8080 max_fails=3 fail_timeout=30s;
}

server {
    listen 80;
    server_name example.com;
    
    location / {
        proxy_pass http://backend;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}