{"id":19555,"date":"2024-09-27T11:40:22","date_gmt":"2024-09-27T03:40:22","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-cn\/how-to-implement-ddos-protection-for-bare-metal-servers\/"},"modified":"2025-04-09T11:57:57","modified_gmt":"2025-04-09T03:57:57","slug":"how-to-implement-ddos-protection-for-bare-metal-servers","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-cn\/blog\/how-to-implement-ddos-protection-for-bare-metal-servers\/","title":{"rendered":"\u5982\u4f55\u4e3a\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u5b9e\u65bdDDoS\u9632\u62a4?"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u7684\u6570\u5b57\u73af\u5883\u4e2d,<a href=\"https:\/\/www.varidata.com\/zh-cn\/server\/hk\/cn2\/\" target=\"_blank\">\u88f8\u91d1\u5c5e\u670d\u52a1\u5668<\/a>\u9762\u4e34\u7740\u65e5\u76ca\u590d\u6742\u7684DDoS\u653b\u51fb\u3002\u672c\u7efc\u5408\u6307\u5357\u63a2\u8ba8\u4e86\u524d\u6cbf\u9632\u62a4\u7b56\u7565,\u7ed3\u5408\u786c\u4ef6\u4f18\u5316\u548c\u8f6f\u4ef6\u89e3\u51b3\u65b9\u6848,\u6253\u9020\u5f3a\u5927\u7684\u9632\u5fa1\u673a\u5236\u3002<\/p>\n<h2><strong>\u7406\u89e3\u73b0\u4ee3\u57fa\u7840\u8bbe\u65bd\u4e2d\u7684DDoS\u5a01\u80c1<\/strong><\/h2>\n<p>\u73b0\u4ee3DDoS\u653b\u51fb\u5df2\u7ecf\u53d1\u5c55\u8d85\u8d8a\u4e86\u7b80\u5355\u7684\u6d2a\u6c34\u653b\u51fb\u3002\u5982\u4eca\u7684\u5a01\u80c1\u5305\u62ec\u590d\u6742\u7684\u7b2c7\u5c42\u653b\u51fb\u3001TCP SYN\u6d2a\u6c34\u548cDNS\u653e\u5927\u653b\u51fb\u3002\u7531\u4e8e\u76f4\u63a5\u66b4\u9732\u5728\u7f51\u7edc\u4e2d,\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u7279\u522b\u5bb9\u6613\u53d7\u5230\u653b\u51fb\u3002\u8ba9\u6211\u4eec\u6df1\u5165\u4e86\u89e3\u8fd9\u4e9b\u5a01\u80c1\u7684\u6280\u672f\u7ec6\u8282\u53ca\u5176\u7f13\u89e3\u7b56\u7565\u3002<\/p>\n<h2><strong>\u786c\u4ef6\u5c42\u9762\u7684\u9632\u62a4\u63aa\u65bd<\/strong><\/h2>\n<p>\u5b9e\u65bd\u786c\u4ef6\u5c42\u9762\u7684DDoS\u9632\u62a4\u59cb\u4e8e\u7f51\u7edc\u63a5\u53e3\u5361(NIC)\u4f18\u5316\u3002\u4ee5\u4e0b\u662f\u914d\u7f6e\u7f51\u7edc\u63a5\u53e3\u4ee5\u589e\u5f3a\u9632\u62a4\u7684\u5b9e\u7528\u793a\u4f8b:<\/p>\n<pre><code>\r\n# \u542f\u7528\u63a5\u6536\u7aef\u6269\u5c55(RSS)\r\nethtool -K eth0 rx-checksumming on\r\nethtool -K eth0 tx-checksumming on\r\nethtool -K eth0 scatter-gather on\r\nethtool -K eth0 tcp-segmentation-offload on\r\n\r\n# \u4f18\u5316\u7f51\u7edc\u961f\u5217\r\nethtool -G eth0 rx 4096\r\nethtool -G eth0 tx 4096\r\n\r\n# \u542f\u7528\u4e2d\u65ad\u5408\u5e76\r\nethtool -C eth0 rx-usecs 100 rx-frames 256\r\n<\/code><\/pre>\n<h2><strong>\u7f51\u7edc\u5c42\u9632\u5fa1\u7b56\u7565<\/strong><\/h2>\n<p>\u5b9e\u65bdBGP\u9ed1\u6d1e\u548c\u6d41\u91cf\u6e05\u6d17\u9700\u8981\u8c28\u614e\u914d\u7f6e\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528iptables\u5b9e\u73b0\u901f\u7387\u9650\u5236\u7684\u793a\u4f8b:<\/p>\n<pre><code>\r\n# \u9650\u5236\u4f20\u5165TCP\u8fde\u63a5\u901f\u7387\r\niptables -A INPUT -p tcp --dport 80 -m state --state NEW -m limit --limit 20\/minute --limit-burst 100 -j ACCEPT\r\n\r\n# \u4e22\u5f03\u8fc7\u91cf\u7684SYN\u6570\u636e\u5305\r\niptables -A INPUT -p tcp --syn -m limit --limit 1\/s --limit-burst 3 -j ACCEPT\r\niptables -A INPUT -p tcp --syn -j DROP\r\n\r\n# \u9632\u5fa1ping\u6d2a\u6c34\u653b\u51fb\r\niptables -A INPUT -p icmp -m limit --limit 1\/s --limit-burst 1 -j ACCEPT\r\niptables -A INPUT -p icmp -j DROP\r\n<\/code><\/pre>\n<h2><strong>\u57fa\u4e8e\u8f6f\u4ef6\u7684\u9632\u62a4\u914d\u7f6e<\/strong><\/h2>\n<p>\u73b0\u4ee3DDoS\u9632\u62a4\u9700\u8981\u591a\u5c42\u8f6f\u4ef6\u65b9\u6848\u3002\u6211\u4eec\u5c06\u5b9e\u65bdfail2ban\u8fdb\u884c\u81ea\u52a8IP\u5c01\u7981,\u5e76\u914d\u7f6e\u5177\u6709\u901f\u7387\u9650\u5236\u529f\u80fd\u7684nginx\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u5b9e\u73b0:<\/p>\n<pre><code>\r\n# Fail2ban\u7684nginx\u914d\u7f6e\r\n[nginx-req-limit]\r\nenabled = true\r\nfilter = nginx-req-limit\r\naction = iptables-multiport[name=ReqLimit, port=\"http,https\", protocol=tcp]\r\nlogpath = \/var\/log\/nginx\/error.log\r\nfindtime = 600\r\nbantime = 7200\r\nmaxretry = 10\r\n\r\n# Nginx\u901f\u7387\u9650\u5236\u914d\u7f6e\r\nhttp {\r\n    limit_req_zone $binary_remote_addr zone=one:10m rate=1r\/s;\r\n    \r\n    server {\r\n        location \/ {\r\n            limit_req zone=one burst=5 nodelay;\r\n            limit_req_status 429;\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<h2><strong>\u9ad8\u7ea7\u6d41\u91cf\u5206\u6790\u548c\u7f13\u89e3<\/strong><\/h2>\n<p>\u5b9e\u65bd\u5b9e\u65f6\u6d41\u91cf\u5206\u6790\u6709\u52a9\u4e8e\u5feb\u901f\u8bc6\u522b\u548c\u7f13\u89e3\u653b\u51fb\u3002\u4f7f\u7528tcpdump\u548cnetstat\u8fdb\u884c\u6d41\u91cf\u76d1\u63a7\u53ef\u63d0\u4f9b\u5b9d\u8d35\u7684\u89c1\u89e3:<\/p>\n<pre><code>\r\n# \u76d1\u63a7TCP SYN\u6570\u636e\u5305\r\ntcpdump -i eth0 'tcp[tcpflags] & (tcp-syn) != 0'\r\n\r\n# \u8ddf\u8e2a\u8fde\u63a5\u72b6\u6001\r\nnetstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n\r\n\r\n# \u8fde\u63a5\u76d1\u63a7\u7684\u81ea\u5b9a\u4e49Python\u811a\u672c\r\nimport socket\r\nimport time\r\nfrom collections import defaultdict\r\n\r\nconnections = defaultdict(int)\r\ndef monitor_connections(port=80):\r\n    sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)\r\n    while True:\r\n        packet = sock.recvfrom(65535)\r\n        ip_header = packet[0][0:20]\r\n        src_ip = socket.inet_ntoa(ip_header[12:16])\r\n        connections[src_ip] += 1\r\n        if connections[src_ip] > 100:\r\n            print(f\"\u6765\u81ea {src_ip} \u7684\u6f5c\u5728DDoS\u653b\u51fb\")\r\n<\/code><\/pre>\n<h2><strong>\u8d1f\u8f7d\u5747\u8861\u548c\u5206\u5e03\u7b56\u7565<\/strong><\/h2>\n<p>\u5b9e\u65bd\u8d1f\u8f7d\u5747\u8861\u5bf9DDoS\u7f13\u89e3\u81f3\u5173\u91cd\u8981\u3002\u4ee5\u4e0b\u662fHAProxy\u914d\u7f6e\u793a\u4f8b,\u7528\u4e8e\u5728\u591a\u4e2a\u670d\u52a1\u5668\u4e4b\u95f4\u5206\u914d\u6d41\u91cf:<\/p>\n<pre><code>\r\nglobal\r\n    maxconn 50000\r\n    log \/dev\/log local0\r\n\r\ndefaults\r\n    mode    http\r\n    option  httplog\r\n    option  dontlognull\r\n    timeout connect 5000\r\n    timeout client  50000\r\n    timeout server  50000\r\n\r\nfrontend http-in\r\n    bind *:80\r\n    acl blacklisted src_conn_cur ge 100\r\n    tcp-request connection reject if blacklisted\r\n    default_backend servers\r\n\r\nbackend servers\r\n    balance roundrobin\r\n    stick-table type ip size 1m expire 30s store conn_cur\r\n    stick on src\r\n    server server1 xx.x.x.x:xx check\r\n    server server2 xx.x.x.x:xx check\r\n<\/code><\/pre>\n<h2><strong>\u5b9e\u65bd\u81ea\u52a8\u54cd\u5e94\u7cfb\u7edf<\/strong><\/h2>\n<p>\u81ea\u52a8\u54cd\u5e94\u7cfb\u7edf\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u60a8\u7684DDoS\u9632\u62a4\u80fd\u529b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528Python\u548cRedis\u8ddf\u8e2a\u548c\u5c01\u7981\u53ef\u7591IP\u5730\u5740\u7684\u5b9e\u7528\u5b9e\u73b0:<\/p>\n<pre><code>\r\nimport redis\r\nfrom datetime import datetime\r\nimport subprocess\r\n\r\nclass DDOSDetector:\r\n    def __init__(self):\r\n        self.redis_client = redis.Redis(host='localhost', port=6379, db=0)\r\n        self.threshold = 100\r\n        self.window = 60  # \u79d2\r\n\r\n    def track_request(self, ip_address):\r\n        current_time = datetime.now().timestamp()\r\n        pipe = self.redis_client.pipeline()\r\n        \r\n        # \u5c06\u8bf7\u6c42\u6dfb\u52a0\u5230\u6ed1\u52a8\u7a97\u53e3\r\n        pipe.zadd(f'requests:{ip_address}', {current_time: current_time})\r\n        pipe.zremrangebyscore(f'requests:{ip_address}', \r\n                             0, current_time - self.window)\r\n        pipe.zcard(f'requests:{ip_address}')\r\n        \r\n        _, _, request_count = pipe.execute()\r\n        \r\n        if request_count > self.threshold:\r\n            self.block_ip(ip_address)\r\n    \r\n    def block_ip(self, ip_address):\r\n        command = f'iptables -A INPUT -s {ip_address} -j DROP'\r\n        subprocess.run(command.split())\r\n<\/code><\/pre>\n<h2><strong>\u6027\u80fd\u76d1\u63a7\u548c\u7cfb\u7edf\u4f18\u5316<\/strong><\/h2>\n<p>\u5b9a\u671f\u6027\u80fd\u76d1\u63a7\u5bf9\u7ef4\u6301\u6709\u6548\u7684DDoS\u9632\u62a4\u81f3\u5173\u91cd\u8981\u3002\u8003\u8651\u5b9e\u65bd\u4ee5\u4e0b\u76d1\u63a7\u811a\u672c:<\/p>\n<pre><code>\r\n#!\/bin\/bash\r\n\r\n# \u7cfb\u7edf\u8d44\u6e90\u76d1\u63a7\r\nwhile true; do\r\n    echo \"=== \u7cfb\u7edf\u72b6\u6001 $(date) ===\"\r\n    echo \"CPU\u4f7f\u7528\u7387:\"\r\n    mpstat 1 1 | grep -A 5 \"%idle\" | tail -n 1\r\n    \r\n    echo \"\u5185\u5b58\u4f7f\u7528\u7387:\"\r\n    free -m | grep Mem\r\n    \r\n    echo \"\u7f51\u7edc\u8fde\u63a5:\"\r\n    netstat -ant | awk '{print $6}' | sort | uniq -c\r\n    \r\n    echo \"\u5f53\u524d\u5df2\u5c01\u7981IP:\"\r\n    iptables -L INPUT -n -v | grep DROP\r\n    \r\n    sleep 60\r\ndone\r\n<\/code><\/pre>\n<h2><strong>\u6700\u4f73\u5b9e\u8df5\u548c\u672a\u6765\u8003\u8651<\/strong><\/h2>\n<p>\u5728\u4e3a\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u5b9e\u65bdDDoS\u9632\u62a4\u65f6,\u8bf7\u8003\u8651\u4ee5\u4e0b\u5173\u952e\u56e0\u7d20:<\/p>\n<ul>\n<li>\u5b9a\u671f\u5b89\u5168\u5ba1\u8ba1\u548c\u6e17\u900f\u6d4b\u8bd5<\/li>\n<li>\u6301\u7eed\u76d1\u63a7\u548c\u7cfb\u7edf\u66f4\u65b0<\/li>\n<li>\u57fa\u7840\u8bbe\u65bd\u53ef\u6269\u5c55\u6027\u89c4\u5212<\/li>\n<li>\u5e94\u6025\u54cd\u5e94\u534f\u8bae\u5236\u5b9a<\/li>\n<\/ul>\n<p>DDoS\u9632\u62a4\u7684\u672a\u6765\u53d1\u5c55\u53ef\u80fd\u4f1a\u878d\u5165\u673a\u5668\u5b66\u4e60\u548c\u4eba\u5de5\u667a\u80fd\u9a71\u52a8\u7684\u68c0\u6d4b\u7cfb\u7edf\u3002\u8bf7\u6301\u7eed\u5173\u6ce8\u65b0\u5174\u6280\u672f\u5e76\u5b9a\u671f\u66f4\u65b0\u60a8\u7684\u9632\u62a4\u7b56\u7565\u3002<\/p>\n<h2><strong>\u7ed3\u8bba<\/strong><\/h2>\n<p>\u4fdd\u62a4\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u514d\u53d7DDoS\u653b\u51fb\u9700\u8981\u7efc\u5408\u65b9\u6cd5,\u7ed3\u5408\u786c\u4ef6\u4f18\u5316\u3001\u8f6f\u4ef6\u914d\u7f6e\u548c\u4e3b\u52a8\u76d1\u63a7\u3002\u901a\u8fc7\u5b9e\u65bd\u672c\u6307\u5357\u4e2d\u8be6\u8ff0\u7684\u89e3\u51b3\u65b9\u6848,\u60a8\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u670d\u52a1\u5668\u62b5\u5fa1DDoS\u5a01\u80c1\u7684\u80fd\u529b\u3002\u8bf7\u8bb0\u4f4f\u5b9a\u671f\u5ba1\u67e5\u548c\u66f4\u65b0\u60a8\u7684\u9632\u62a4\u63aa\u65bd,\u4ee5\u5e94\u5bf9\u4e0d\u65ad\u53d1\u5c55\u7684\u5b89\u5168\u6311\u6218\u3002<\/p>\n<p>\u4e3a\u4e86\u6700\u4f73\u4fdd\u62a4\u60a8\u7684\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u79df\u7528\u57fa\u7840\u8bbe\u65bd,\u8bf7\u8003\u8651\u5c06\u8fd9\u4e9b\u5b89\u5168\u63aa\u65bd\u4f5c\u4e3a\u66f4\u5e7f\u6cdb\u5b89\u5168\u7b56\u7565\u7684\u4e00\u90e8\u5206,\u5176\u4e2d\u5305\u62ec\u5b9a\u671f\u66f4\u65b0\u3001\u76d1\u63a7\u548c\u54cd\u5e94\u8ba1\u5212\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u5f53\u4eca\u7684\u6570\u5b57\u73af\u5883\u4e2d,\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u9762\u4e34\u7740\u65e5\u76ca\u590d\u6742\u7684DDoS\u653b\u51fb\u3002\u672c\u7efc\u5408\u6307\u5357\u63a2\u8ba8\u4e86\u524d\u6cbf\u9632\u62a4\u7b56\u7565,\u7ed3\u5408\u786c\u4ef6\u4f18\u5316\u548c\u8f6f\u4ef6\u89e3\u51b3\u65b9\u6848,\u6253\u9020\u5f3a\u5927\u7684\u9632\u5fa1\u673a\u5236\u3002 \u7406\u89e3\u73b0\u4ee3\u57fa\u7840\u8bbe\u65bd\u4e2d\u7684DDoS\u5a01\u80c1 \u73b0\u4ee3DDoS\u653b\u51fb\u5df2\u7ecf\u53d1\u5c55\u8d85\u8d8a\u4e86\u7b80\u5355\u7684\u6d2a\u6c34\u653b\u51fb\u3002\u5982\u4eca\u7684\u5a01\u80c1\u5305\u62ec\u590d\u6742\u7684\u7b2c7\u5c42\u653b\u51fb\u3001TCP SYN\u6d2a\u6c34\u548cDNS\u653e\u5927\u653b\u51fb\u3002\u7531\u4e8e\u76f4\u63a5\u66b4\u9732\u5728\u7f51\u7edc\u4e2d,\u88f8\u91d1\u5c5e\u670d\u52a1\u5668\u7279\u522b\u5bb9\u6613\u53d7\u5230\u653b\u51fb\u3002\u8ba9\u6211\u4eec\u6df1\u5165\u4e86\u89e3\u8fd9\u4e9b\u5a01\u80c1\u7684\u6280\u672f\u7ec6\u8282\u53ca\u5176\u7f13\u89e3\u7b56\u7565\u3002 \u786c\u4ef6\u5c42\u9762\u7684\u9632\u62a4\u63aa\u65bd \u5b9e\u65bd\u786c\u4ef6\u5c42\u9762\u7684DDoS\u9632\u62a4\u59cb\u4e8e\u7f51\u7edc\u63a5\u53e3\u5361(NIC)\u4f18\u5316\u3002\u4ee5\u4e0b\u662f\u914d\u7f6e\u7f51\u7edc\u63a5\u53e3\u4ee5\u589e\u5f3a\u9632\u62a4\u7684\u5b9e\u7528\u793a\u4f8b: # \u542f\u7528\u63a5\u6536\u7aef\u6269\u5c55(RSS) ethtool -K eth0 rx-checksumming on ethtool -K eth0 tx-checksumming on ethtool -K eth0 scatter-gather on ethtool -K eth0 tcp-segmentation-offload on # \u4f18\u5316\u7f51\u7edc\u961f\u5217 ethtool -G eth0 rx 4096 ethtool -G eth0 tx 4096 # \u542f\u7528\u4e2d\u65ad\u5408\u5e76 ethtool -C eth0 rx-usecs 100 rx-frames 256 \u7f51\u7edc\u5c42\u9632\u5fa1\u7b56\u7565 \u5b9e\u65bdBGP\u9ed1\u6d1e\u548c\u6d41\u91cf\u6e05\u6d17\u9700\u8981\u8c28\u614e\u914d\u7f6e\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528iptables\u5b9e\u73b0\u901f\u7387\u9650\u5236\u7684\u793a\u4f8b: # \u9650\u5236\u4f20\u5165TCP\u8fde\u63a5\u901f\u7387 iptables -A [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.varidata.com\/zh-cn\/blog\/how-to-implement-ddos-protection-for-bare-metal-servers\/\">Read 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