{"id":27888,"date":"2025-12-01T13:49:03","date_gmt":"2025-12-01T05:49:03","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-tw\/troubleshooting-server-bandwidth-spikes-during-peak-traffic\/"},"modified":"2025-12-01T13:51:21","modified_gmt":"2025-12-01T05:51:21","slug":"troubleshooting-server-bandwidth-spikes-during-peak-traffic","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-tw\/knowledge-tc\/troubleshooting-server-bandwidth-spikes-during-peak-traffic\/","title":{"rendered":"\u6545\u969c\u6392\u67e5\uff1a\u5c16\u5cf0\u671f\u4f3a\u670d\u5668\u983b\u5bec\u7a81\u767c\u98fd\u548c\u554f\u984c"},"content":{"rendered":"<p>\u7576\u4f3a\u670d\u5668\u983b\u5bec\u5728\u8a2a\u554f\u5c16\u5cf0\u671f\u7a81\u7136\u9054\u5230\u98fd\u548c\u72c0\u614b\u6642\uff0c\u6bcf\u4e00\u79d2\u90fd\u81f3\u95dc\u91cd\u8981\u3002\u5c0d\u65bc\u7ba1\u7406<a href=\"https:\/\/www.varidata.com\/zh-tw\/server\/us\/cn2\" target=\"_blank\">\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528<\/a>\u57fa\u790e\u8a2d\u65bd\u7684\u7cfb\u7d71\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c\u7406\u89e3\u5982\u4f55\u5feb\u901f\u8a3a\u65b7\u548c\u89e3\u6c7a<a href=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/fixed-bandwidth-vs-peak-bandwidth-which-is-better\/\" target=\"_blank\">\u983b\u5bec\u98fd\u548c<\/a>\u554f\u984c\u5c0d\u65bc\u7dad\u6301\u670d\u52d9\u53ef\u9760\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2><strong>\u983b\u5bec\u98fd\u548c\u7684\u5e38\u898b\u539f\u56e0<\/strong><\/h2>\n<p>\u5728\u958b\u59cb\u6545\u969c\u6392\u67e5\u4e4b\u524d\uff0c\u8b93\u6211\u5011\u5148\u4f86\u4e86\u89e3\u53ef\u80fd\u89f8\u767c\u983b\u5bec\u7a81\u589e\u7684\u5178\u578b\u60c5\u5883\uff1a<\/p>\n<ul>\n<li>\u6b63\u5e38\u6d41\u91cf\u6fc0\u589e\n<ul>\n<li>\u5167\u5bb9\u5728\u793e\u7fa4\u5a92\u9ad4\u4e0a\u75c5\u6bd2\u5f0f\u50b3\u64ad<\/li>\n<li>\u884c\u92b7\u6d3b\u52d5\u555f\u52d5<\/li>\n<li>\u9ed1\u8272\u661f\u671f\u4e94\u6216\u7bc0\u6176\u671f\u9593\u7684\u6d41\u91cf<\/li>\n<\/ul>\n<\/li>\n<li>\u60e1\u610f\u6d3b\u52d5\n<ul>\n<li>\u91dd\u5c0d\u57fa\u790e\u8a2d\u65bd\u7684DDoS\u653b\u64ca<\/li>\n<li>\u6fc0\u9032\u7684\u7db2\u9801\u722c\u87f2<\/li>\n<li>\u52a0\u5bc6\u8ca8\u5e63\u6316\u7926\u60e1\u610f\u7a0b\u5f0f<\/li>\n<li>\u6bad\u5c4d\u7db2\u8def\u6d3b\u52d5<\/li>\n<\/ul>\n<\/li>\n<li>\u7cfb\u7d71\u914d\u7f6e\u932f\u8aa4\n<ul>\n<li>CDN\u8def\u7531\u554f\u984c<\/li>\n<li>\u983b\u5bec\u9650\u5236\u914d\u7f6e\u4e0d\u7576<\/li>\n<li>\u5feb\u53d6\u5931\u6548\u554f\u984c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u5feb\u901f\u8a3a\u65b7\u6d41\u7a0b<\/strong><\/h2>\n<ol>\n<li>\u521d\u59cb\u7cfb\u7d71\u5206\u6790\n<ul>\n<li>\u57f7\u884c `netstat -ntu | awk &#8216;{print $5}&#8217; | cut -d: -f1 | sort | uniq -c | sort -n`<\/li>\n<li>\u4f7f\u7528 `iftop` \u6216 `nethogs` \u76e3\u63a7\u5373\u6642\u983b\u5bec\u4f7f\u7528\u60c5\u6cc1<\/li>\n<li>\u4f7f\u7528 `top` \u548c `htop` \u6aa2\u67e5\u7cfb\u7d71\u8ca0\u8f09<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<ol start=\"2\">\n<li>\u7db2\u8def\u9023\u7dda\u5206\u6790\n<ul>\n<li>\u57f7\u884c `tcpdump -i any -n`<\/li>\n<li>\u4f7f\u7528 `wireshark` \u5206\u6790\u6d41\u91cf\u6a21\u5f0f<\/li>\n<li>\u6aa2\u67e5\u5df2\u5efa\u7acb\u7684\u9023\u7dda\uff1a`netstat -ant | grep ESTABLISHED`<\/li>\n<\/ul>\n<\/li>\n<li>\u65e5\u8a8c\u8abf\u67e5\n<ul>\n<li>\u89e3\u6790\u5b58\u53d6\u65e5\u8a8c\uff1a`tail -f \/var\/log\/nginx\/access.log | grep -v &#8220;200&#8221;`<\/li>\n<li>\u76e3\u63a7\u932f\u8aa4\u65e5\u8a8c\uff1a`journalctl -xe`<\/li>\n<li>\u5206\u6790\u7cfb\u7d71\u8a0a\u606f\uff1a`dmesg | tail -n 100`<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2><strong>\u61c9\u6025\u56de\u61c9\u65b9\u6848<\/strong><\/h2>\n<p>\u5728\u8655\u7406\u983b\u5bec\u98fd\u548c\u554f\u984c\u6642\uff0c\u6642\u6548\u6027\u884c\u52d5\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u60a8\u7684\u61c9\u6025\u56de\u61c9\u6e05\u55ae\uff1a<\/p>\n<ul>\n<li>\u5373\u6642\u884c\u52d5\n<ul>\n<li>\u555f\u7528UDP\u904e\u6ffe<\/li>\n<li>\u555f\u52d5\u7dca\u6025DDoS\u7de9\u89e3\u63aa\u65bd<\/li>\n<li>\u5be6\u65bd\u81e8\u6642\u901f\u7387\u9650\u5236<\/li>\n<li>\u64f4\u5c55\u983b\u5bec\u5206\u914d<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u89e3\u6c7a\u65b9\u6848\u6280\u8853\u5be6\u73fe<\/strong><\/h2>\n<p>\u4ee5\u4e0b\u662f\u5be6\u65bd\u7dca\u6025\u983b\u5bec\u7ba1\u7406\u7684\u5be6\u7528\u6307\u5357\uff1a<\/p>\n<pre><code>\r\n# \u4f7f\u7528iptables\u9032\u884c\u901f\u7387\u9650\u5236\r\niptables -A INPUT -p tcp --dport 80 -m limit --limit 25\/minute --limit-burst 100 -j ACCEPT\r\n\r\n# Nginx\u5feb\u901f\u901f\u7387\u9650\u5236\r\nlimit_req_zone $binary_remote_addr zone=one:10m rate=10r\/s;\r\nlimit_req zone=one burst=10 nodelay;\r\n\r\n# \u555f\u7528\u5167\u6838TCP SYN cookies\r\necho 1 > \/proc\/sys\/net\/ipv4\/tcp_syncookies\r\n<\/code><\/pre>\n<h2><strong>\u9577\u671f\u9810\u9632\u7b56\u7565<\/strong><\/h2>\n<p>\u5be6\u65bd\u7a69\u5065\u7684\u9810\u9632\u63aa\u65bd\u5c0d\u7dad\u6301\u6700\u4f73\u4f3a\u670d\u5668\u6548\u80fd\u81f3\u95dc\u91cd\u8981\uff1a<\/p>\n<ul>\n<li>\u57fa\u790e\u8a2d\u65bd\u512a\u5316\n<ul>\n<li>\u90e8\u7f72\u591a\u5c64CDN\u67b6\u69cb<\/li>\n<li>\u5be6\u65bd\u81ea\u52d5\u64f4\u5c55\u89f8\u767c\u5668<\/li>\n<li>\u5efa\u7acb\u5730\u7406\u8ca0\u8f09\u5e73\u8861<\/li>\n<li>\u914d\u7f6e\u983b\u5bec\u76e3\u63a7\u8b66\u5831<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u6848\u4f8b\u5206\u6790\uff1a\u9ad8\u6d41\u91cf\u96fb\u5546\u5e73\u53f0<\/strong><\/h2>\n<p>\u8b93\u6211\u5011\u5206\u6790\u4e00\u500b\u4f86\u81ea\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u5e73\u53f0\u4e0a\u7684\u96fb\u5546\u7db2\u7ad9\u5728\u9ed1\u8272\u661f\u671f\u4e94\u671f\u9593\u7684\u771f\u5be6\u4e8b\u4ef6\uff1a<\/p>\n<pre><code>\r\n# \u521d\u59cb\u8b66\u5831\r\n[2023-11-24 14:02:33] \u8b66\u544a: \u983b\u5bec\u4f7f\u7528\u7387\u9054\u523095%\r\n[2023-11-24 14:03:15] \u56b4\u91cd: \u9023\u7dda\u6c60\u8017\u76e1\r\n[2023-11-24 14:03:45] \u932f\u8aa4: \u8ca0\u8f09\u5e73\u8861\u5668\u5065\u5eb7\u6aa2\u67e5\u5931\u6557\r\n<\/code><\/pre>\n<h2><strong>\u8a3a\u65b7\u8f38\u51fa\u5206\u6790<\/strong><\/h2>\n<p>\u4f3a\u670d\u5668\u65e5\u8a8c\u7684\u95dc\u9375\u767c\u73fe\uff1a<\/p>\n<ul>\n<li>\u7db2\u8def\u7d71\u8a08\n<ul>\n<li>\u5165\u7ad9\u6d41\u91cf\uff1a8.5 Gbps\uff08\u8d85\u51fa\u6b63\u5e38\u503c850%\uff09<\/li>\n<li>\u9023\u7dda\u72c0\u614b\uff1a89% \u8655\u65bcSYN_RECV\u72c0\u614b<\/li>\n<li>\u524d10\u500bIP\u8ca2\u737b\u4e8675%\u7684\u8acb\u6c42\u91cf<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre><code>\r\n# \u61c9\u7528\u7684\u89e3\u6c7a\u6b65\u9a5f\r\n$ sysctl -w net.ipv4.tcp_max_syn_backlog=4096\r\n$ iptables-restore < \/etc\/iptables\/emergency-rules.v4\r\n$ systemctl restart nginx\r\n<\/code><\/pre>\n<h2><strong>\u6548\u80fd\u512a\u5316\u6280\u8853<\/strong><\/h2>\n<p>\u70ba\u60a8\u7684\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u57fa\u790e\u8a2d\u65bd\u5be6\u65bd\u9019\u4e9b\u7d93\u904e\u9a57\u8b49\u7684\u512a\u5316\u7b56\u7565\uff1a<\/p>\n<ol>\n<li>\u5167\u6838\u8abf\u512a\n<pre><code>\r\n# \/etc\/sysctl.conf \u512a\u5316\u914d\u7f6e\r\nnet.core.somaxconn = 65535\r\nnet.ipv4.tcp_max_tw_buckets = 1440000\r\nnet.ipv4.tcp_fin_timeout = 15\r\nnet.ipv4.tcp_keepalive_time = 300\r\nnet.ipv4.tcp_keepalive_probes = 5\r\nnet.ipv4.tcp_keepalive_intvl = 15\r\n        <\/code><\/pre>\n<\/li>\n<\/ol>\n<h2><strong>\u76e3\u63a7\u548c\u8b66\u5831\u7cfb\u7d71<\/strong><\/h2>\n<p>\u5efa\u7acb\u5168\u9762\u7684\u76e3\u63a7\u8a2d\u7f6e\uff1a<\/p>\n<pre><code>\r\n# Prometheus \u8b66\u5831\u898f\u5247\u793a\u4f8b\r\n- alert: \u983b\u5bec\u4f7f\u7528\u7387\u904e\u9ad8\r\n  expr: rate(node_network_receive_bytes_total[5m]) > 7516192768\r\n  for: 2m\r\n  labels:\r\n    severity: critical\r\n  annotations:\r\n    description: \"\u7db2\u8def\u63a5\u6536\u901f\u7387\u8d85\u904e7.5 Gbps\"\r\n<\/code><\/pre>\n<h2><strong>\u6700\u4f73\u5be6\u8e10\u548c\u672a\u4f86\u898f\u5283<\/strong><\/h2>\n<p>\u5be6\u65bd\u9019\u4e9b\u9032\u968e\u7b56\u7565\u5c07\u6709\u52a9\u65bc\u4fdd\u6301\u6700\u4f73\u4f3a\u670d\u5668\u6548\u80fd\uff1a<\/p>\n<ul>\n<li>\u81ea\u52d5\u56de\u61c9\u7cfb\u7d71\n<pre><code>\r\n# Ansible playbook \u81ea\u52d5\u56de\u61c9\u793a\u4f8b\r\n- name: \u555f\u7528DDoS\u9632\u8b77\r\n  hosts: edge_servers\r\n  tasks:\r\n    - name: \u61c9\u7528\u7dca\u6025iptables\u898f\u5247\r\n      iptables_raw:\r\n        name: emergency_rules\r\n        rules: |\r\n          -A INPUT -p tcp --syn -m limit --limit 1\/s --limit-burst 3 -j ACCEPT\r\n          -A INPUT -p tcp --syn -j DROP\r\n        state: present\r\n        <\/code><\/pre>\n<\/li>\n<\/ul>\n<h2><strong>\u8cc7\u6e90\u5229\u7528\u7387\u5206\u6790<\/strong><\/h2>\n<p>\u76e3\u63a7\u9019\u4e9b\u95dc\u9375\u6307\u6a19\u4ee5\u7372\u53d6\u65e9\u671f\u9810\u8b66\u8a0a\u865f\uff1a<\/p>\n<ol>\n<li>\u7db2\u8def\u6307\u6a19\n<ul>\n<li>\u6bcf\u79d2\u8cc7\u6599\u5305\u6578\uff08PPS\uff09<\/li>\n<li>TCP\u9023\u7dda\u72c0\u614b<\/li>\n<li>\u7de9\u885d\u5340\u4f7f\u7528\u7d71\u8a08<\/li>\n<li>\u4ecb\u9762\u932f\u8aa4\u548c\u4e1f\u5305\u60c5\u6cc1<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2><strong>\u63a8\u85a6\u5de5\u5177\u548c\u8cc7\u6e90<\/strong><\/h2>\n<ul>\n<li>\u7db2\u8def\u5206\u6790\u5de5\u5177\n<ul>\n<li>iftop - \u5373\u6642\u983b\u5bec\u76e3\u63a7<\/li>\n<li>nload - \u7db2\u8def\u8ca0\u8f09\u76e3\u8996\u5668<\/li>\n<li>darkstat - \u7db2\u8def\u7d71\u8a08\u6536\u96c6\u5668<\/li>\n<li>vnstat - \u7db2\u8def\u6d41\u91cf\u76e3\u63a7\u5668<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u7d50\u8ad6<\/strong><\/h2>\n<p>\u5728\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u74b0\u5883\u4e2d\uff0c\u6709\u6548\u7684\u983b\u5bec\u7ba1\u7406\u9700\u8981\u7d50\u5408\u4e3b\u52d5\u76e3\u63a7\u3001\u5feb\u901f\u56de\u61c9\u5354\u5b9a\u548c\u5f37\u5927\u7684\u512a\u5316\u6280\u8853\u3002\u900f\u904e\u5be6\u65bd\u672c\u6307\u5357\u4e2d\u6982\u8ff0\u7684\u7b56\u7565\uff0c\u7cfb\u7d71\u7ba1\u7406\u54e1\u53ef\u4ee5\u5728\u6d41\u91cf\u7a81\u589e\u671f\u9593\u4fdd\u6301\u9ad8\u53ef\u7528\u6027\uff0c\u540c\u6642\u78ba\u4fdd\u6700\u4f73\u4f3a\u670d\u5668\u6548\u80fd\u3002<\/p>\n<p>\u8acb\u8a18\u4f4f\uff0c\u983b\u5bec\u6545\u969c\u6392\u67e5\u662f\u4e00\u500b\u9700\u8981\u6301\u7e8c\u76e3\u63a7\u548c\u8abf\u6574\u7684\u8fed\u4ee3\u904e\u7a0b\u3002\u6301\u7e8c\u95dc\u6ce8\u6700\u65b0\u7684\u4f3a\u670d\u5668\u6548\u80fd\u512a\u5316\u6280\u8853\u548c\u5b89\u5168\u63aa\u65bd\uff0c\u4ee5\u78ba\u4fdd\u60a8\u7684\u4f3a\u670d\u5668\u79df\u7528\u57fa\u790e\u8a2d\u65bd\u80fd\u5920\u61c9\u5c0d\u610f\u5916\u7684\u6d41\u91cf\u6fc0\u589e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7576\u4f3a\u670d\u5668\u983b\u5bec\u5728\u8a2a\u554f\u5c16\u5cf0\u671f\u7a81\u7136\u9054\u5230\u98fd\u548c\u72c0\u614b\u6642\uff0c\u6bcf\u4e00\u79d2\u90fd\u81f3\u95dc\u91cd\u8981\u3002\u5c0d\u65bc\u7ba1\u7406\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u57fa\u790e\u8a2d\u65bd\u7684\u7cfb\u7d71\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.varidata.com\/zh-tw\/knowledge-tc\/troubleshooting-server-bandwidth-spikes-during-peak-traffic\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":11,"featured_media":27885,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[268],"tags":[],"class_list":["post-27888","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-tc"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6545\u969c\u6392\u67e5\uff1a\u5c16\u5cf0\u671f\u4f3a\u670d\u5668\u983b\u5bec\u7a81\u767c\u98fd\u548c\u554f\u984c<\/title>\n<meta name=\"description\" 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