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代碼如下:

#全局配置
limit_req_zone $anti_spider zone=anti_spider:10m rate=15r/m;

#某個server中
limit_req zone=anti_spider burst=30 nodelay;
if ($http_user_agent ~* "xxspider|xxbot") {
set $anti_spider $http_user_agent;
}

超過設置的限定頻率，就會給spider一個503。
上述配置詳細解釋請自行google下，具體的spider/bot名稱請自定義。

附：nginx中禁止屏蔽網絡爬蟲

復制代碼代碼如下:

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

        #charset koi8-r;

        #access_log logs/host.access.log main;

        #location / {
        #    root   html;
        #    index index.html index.htm;
        #}
    if ($http_user_agent ~* "qihoobot|Baiduspider|Googlebot|Googlebot-Mobile|Googlebot-Image|Mediapartners-Google|Adsbot-Google|Feedfetcher-Google|Yahoo! Slurp|Yahoo! Slurp China|YoudaoBot|Sosospider|Sogou spider|Sogou web spider|MSNBot|ia_archiver|Tomato Bot") {
                return 403;
        }

    location ~ ^/(.*)$ {
                proxy_pass http://localhost:8080;
        proxy_redirect          off;
        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header       X-Forwarded-For   $proxy_add_x_forwarded_for;
        client_max_body_size    10m;
        client_body_buffer_size 128k;
        proxy_connect_timeout   90;
        proxy_send_timeout      90;
        proxy_read_timeout      90;
        proxy_buffer_size       4k;
        proxy_buffers           4 32k;
        proxy_busy_buffers_size 64k;
        proxy_temp_file_write_size 64k;
    }

        #error_page 404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504 /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index index.php;
        #    fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny all;
        #}
    }