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# 1. 安装 EPEL 源
sudo yum install epel-release -y

# 2. 安装 Nginx
sudo yum install nginx -y

# 3. 启动并设置开机自启
sudo systemctl start nginx
sudo systemctl enable nginx

# 4. 配置防火墙 (开放 80/443)
sudo firewall-cmd --permanent --add-service=http
sudo firewall-cmd --permanent --add-service=https
sudo firewall-cmd --reload

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user nginx;
worker_processes auto; # 自动根据 CPU 核心数调整
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    # 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"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    # --- 安全与优化配置 (源自文件2的修正) ---
    
    # 隐藏 Nginx 版本号，防止扫描
    server_tokens off; 

    # 开启目录索引 (可选，全局开启)
    # autoindex on; 

    # 限制并发连接数 (定义内存区域)
    # 限制每个 IP 的并发连接数为 10m 大小的空间
    limit_conn_zone $binary_remote_addr zone=addr_limit:10m;
    
    # 限制请求速率
    limit_req_zone $binary_remote_addr zone=req_limit:10m rate=1r/s;

    include /etc/nginx/conf.d/*.conf;
}

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server {
    listen 80;
    server_name example.com www.example.com;

    # 网站根目录
    root /var/www/example.com;
    index index.html index.htm index.php;

    # --- 1. 动静分离配置 ---
    
    # 静态资源：图片、CSS、JS 本地处理并设置缓存
    location ~* \.(png|jpg|jpeg|gif|bmp|ico|css|js)$ {
        root /var/www/example.com/images; # 指定单独存放图片的路径
        expires 1h;                       # 设置缓存时间为1小时 (修正了原文档的 lh)
        access_log off;                   # 不记录静态资源日志以减少 I/O
    }

    # 动态资源：PHP 转发给后端 (例如 LAMP 服务器 192.168.200.50)
    location ~ \.php$ {
        proxy_pass http://192.168.200.50;
        # 必须传递真实的 Host 和 IP，否则后端无法获取客户端信息
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # --- 2. 目录访问控制与别名 ---

    # 别名测试：访问 /abc 实际指向 /var/www/html
    location /abc {
        alias /var/www/html/; # 注意：alias 末尾通常需要加 /
        index index.html;
    }

    # 禁止访问特定目录 /a/
    location ^~ /a/ {
        deny all;
    }

    # --- 3. 密码访问控制 (Auth Basic) ---
    # 需要先生成密码文件：htpasswd -c /etc/nginx/.htpasswd admin
    location /status {
        stub_status on;
        auth_basic "Restricted Area";
        auth_basic_user_file /etc/nginx/.htpasswd;
    }

    # --- 4. 限速与下载限制 ---
    location /downloads/ {
        alias /data/apps/;
        limit_conn addr_limit 1;  # 每个IP限制1个连接
        limit_rate 512k;          # 限制下载速度为 512KB/s
    }

    # --- 5. 自定义错误页面 ---
    # 将 404 错误指向自定义页面
    error_page 404 /404.html;
    location = /404.html {
        root /usr/share/nginx/html;
    }
}

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server {
    listen 443 ssl;
    server_name example.com;

    # 证书路径 (需先申请或生成证书)
    ssl_certificate     /etc/nginx/ssl/server.crt; 
    ssl_certificate_key /etc/nginx/ssl/server.key;

    # SSL 优化配置
    ssl_session_cache shared:SSL:1m;
    ssl_session_timeout  5m;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    location / {
        root /var/www/example.com;
        index index.html;
    }
}