{"id":209805,"date":"2025-10-23T23:35:58","date_gmt":"2025-10-23T15:35:58","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209805\/"},"modified":"2025-10-23T23:35:59","modified_gmt":"2025-10-23T15:35:59","slug":"cdn-138","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209805\/","title":{"rendered":"CDN\u4f9b\u5e94\u5546\u6027\u80fd\u6d4b\u8bd5\uff1a\u5b9e\u6218\u65b9\u6cd5\u4e0e\u5173\u952e\u6307\u6807"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u4e92\u8054\u7f51\u73af\u5883\u4e2d\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u662f\u63d0\u5347\u7f51\u7ad9\u6027\u80fd\u548c\u7528\u6237\u4f53\u9a8c\u7684\u5173\u952e\u7ec4\u4ef6\u3002\u5bf9\u4e8e\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u548c\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u9009\u62e9\u5408\u9002\u7684CDN\u4f9b\u5e94\u5546\u5e76\u8fdb\u884c\u79d1\u5b66\u7684\u6027\u80fd\u6d4b\u8bd5\uff0c\u80fd\u591f\u663e\u8457\u7f29\u77ed\u9875\u9762\u52a0\u8f7d\u65f6\u95f4\u3001\u964d\u4f4e\u6e90\u7ad9\u538b\u529b\u5e76\u63d0\u5347\u5168\u7403\u8bbf\u95ee\u7a33\u5b9a\u6027\u3002\u672c\u6587\u4ece\u539f\u7406\u3001\u5b9e\u6218\u65b9\u6cd5\u548c\u5173\u952e\u6307\u6807\u51fa\u53d1\uff0c\u63d0\u4f9b\u53ef\u64cd\u4f5c\u7684\u6d4b\u8bd5\u6d41\u7a0b\u4e0e\u9009\u8d2d\u5efa\u8bae\uff0c\u5e2e\u52a9\u4f60\u5728\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u5176\u4ed6\u6d77\u5916\u8282\u70b9\uff08\u5982\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u3001\u65b0\u52a0\u5761\u670d\u52a1\u5668\uff09\u4e0a\u6784\u5efa\u9ad8\u6548\u7684\u5206\u53d1\u67b6\u6784\u3002<\/p>\n<h2>CDN \u6027\u80fd\u57fa\u672c\u539f\u7406\u4e0e\u5173\u952e\u5f71\u54cd\u56e0\u7d20<\/h2>\n<p>CDN \u7684\u6838\u5fc3\u601d\u60f3\u662f\u5c06\u9759\u6001\u4e0e\u90e8\u5206\u52a8\u6001\u5185\u5bb9\u7f13\u5b58\u5230\u9760\u8fd1\u7528\u6237\u7684\u8282\u70b9\uff08POP\uff09\uff0c\u4ee5\u51cf\u5c11\u7f51\u7edc\u8df3\u6570\u548c\u4f20\u8f93\u5ef6\u8fdf\u3002\u5f71\u54cd CDN \u6027\u80fd\u7684\u4e3b\u8981\u56e0\u7d20\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5730\u7406\u4f4d\u7f6e\u4e0e\u7f51\u7edc\u62d3\u6251<\/strong>\uff1a\u7528\u6237\u5230\u6700\u8fd1 POP \u7684\u7269\u7406\u8ddd\u79bb\u3001\u8de8\u5883\u94fe\u8def\u8d28\u91cf\uff08\u4f8b\u5982\u4ece\u9999\u6e2f\u5230\u7f8e\u56fd\u7684\u6d77\u5e95\u5149\u7f06\u8def\u5f84\uff09\uff0c\u51b3\u5b9a\u4e86 RTT\uff08\u5f80\u8fd4\u65f6\u5ef6\uff09\u3002<\/li>\n<li><strong>\u7f13\u5b58\u7b56\u7565\u4e0e\u547d\u4e2d\u7387<\/strong>\uff1a\u7f13\u5b58\u89c4\u5219\uff08Cache-Control\u3001Expires\uff09\u3001\u5bf9\u8c61\u5927\u5c0f\u3001\u5e38\u9a7b\u5185\u5b58\u6216\u78c1\u76d8\u7f13\u5b58\u673a\u5236\uff0c\u4f1a\u76f4\u63a5\u5f71\u54cd Cache Hit Rate \u548c\u6e90\u7ad9\u56de\u6e90\u9891\u7387\u3002<\/li>\n<li><strong>\u4f20\u8f93\u534f\u8bae\u4e0e\u52a0\u901f\u6280\u672f<\/strong>\uff1a\u662f\u5426\u652f\u6301 HTTP\/2\u3001HTTP\/3\uff08\u57fa\u4e8e QUIC\uff09\u3001TCP \u4f18\u5316\u3001TLS \u4f1a\u8bdd\u590d\u7528\u4ee5\u53ca Brotli\/Gzip \u538b\u7f29\u7b49\uff0c\u4f1a\u5f71\u54cd\u5e76\u53d1\u3001\u63e1\u624b\u5f00\u9500\u4e0e\u5e26\u5bbd\u5229\u7528\u7387\u3002<\/li>\n<li><strong>\u8282\u70b9\u8d1f\u8f7d\u4e0e\u5e26\u5bbd\u9650\u5236<\/strong>\uff1aPOP \u7684\u89c4\u6a21\u3001\u4e0a\u6e38\u94fe\u8def\u5e26\u5bbd\u3001\u5e26\u5bbd\u5cf0\u503c\u63a7\u5236\u7b56\u7565\uff0c\u51b3\u5b9a\u4e86\u5728\u9ad8\u5e76\u53d1\u4e0b\u7684\u541e\u5410\u80fd\u529b\uff08Throughput\uff09\u548c\u9519\u8bef\u7387\u3002<\/li>\n<li><strong>\u8def\u7531\u4e0e DNS \u89e3\u6790<\/strong>\uff1a\u667a\u80fd\u8c03\u5ea6\u3001Anycast \u4e0e GeoDNS \u7b56\u7565\u4f1a\u5f71\u54cd\u7528\u6237\u9009\u62e9\u5230\u7684 POP\uff0c\u4ece\u800c\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2>\u5b9e\u6218\u6d4b\u8bd5\u65b9\u6cd5\uff1a\u5de5\u5177\u4e0e\u6d41\u7a0b<\/h2>\n<p>\u6709\u6548\u7684 CDN \u6d4b\u8bd5\u5e94\u8986\u76d6\u5408\u6210\u6d4b\u8bd5\uff08Synthetic\uff09\u3001\u5b9e\u7528\u6237\u76d1\u6d4b\uff08RUM\uff09\u4e0e\u538b\u529b\u6d4b\u8bd5\u3002\u5408\u7406\u7ec4\u5408\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u80fd\u4ece\u591a\u4e2a\u7ef4\u5ea6\u8bc4\u4f30 CDN \u6027\u80fd\u3002<\/p>\n<h3>\u4e00\uff1a\u5408\u6210\u6d4b\u8bd5\uff08\u5408\u6210\u76d1\u6d4b\uff09<\/h3>\n<p>\u5408\u6210\u6d4b\u8bd5\u901a\u8fc7\u6a21\u62df\u8bf7\u6c42\u8bc4\u4f30\u65f6\u5ef6\u3001\u541e\u5410\u4e0e\u53ef\u7528\u6027\uff0c\u5e38\u7528\u4e8e\u5bf9\u6bd4\u4e0d\u540c\u4f9b\u5e94\u5546\u6216\u914d\u7f6e\u4f18\u5316\u524d\u540e\u7684\u6027\u80fd\u3002<\/p>\n<ul>\n<li><strong>\u57fa\u7840\u7f51\u7edc\u8bca\u65ad<\/strong>\uff1a\u4f7f\u7528 <code>ping<\/code>\uff08\u6d4b RTT\uff09\u3001<code>traceroute<\/code>\/<code>mtr<\/code>\uff08\u67e5\u770b\u8def\u5f84\u4e22\u5305\u4e0e\u8df3\u70b9\u5ef6\u8fdf\uff09\u6765\u5b9a\u4f4d\u7f51\u7edc\u74f6\u9888\u3002\u4f8b\u5982\uff1a<\/li>\n<li><code>ping -c 10 cdn.example.com<\/code><\/li>\n<li><code>mtr -rwzbc 100 cdn.example.com<\/code><\/li>\n<li><strong>HTTP \u5c42\u6d4b\u91cf<\/strong>\uff1acurl \u7684 -w \u53c2\u6570\u53ef\u8f93\u51fa TTFB\u3001DNS \u89e3\u6790\u65f6\u95f4\u3001TCP \u5efa\u94fe\u65f6\u95f4\u3001TLS \u63e1\u624b\u65f6\u95f4\u7b49\u8be6\u7ec6\u7ec6\u5206\u6307\u6807\uff1a<\/li>\n<li><code>curl -s -o \/dev\/null -w \"dns: %{time_namelookup}s tcp: %{time_connect}s tls: %{time_appconnect}s ttfb: %{time_starttransfer}s total: %{time_total}sn\" https:\/\/cdn.example.com\/asset.js<\/code><\/li>\n<li>\u901a\u8fc7\u591a\u5730\uff08\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u4e1c\u4eac\u3001\u65b0\u52a0\u5761\u7b49\uff09\u5206\u522b\u6267\u884c\u4e0a\u8ff0\u547d\u4ee4\uff0c\u53ef\u4ee5\u83b7\u5f97\u5730\u7406\u5dee\u5f02\u5316\u7684\u6570\u636e\u3002<\/li>\n<li><strong>\u9875\u9762\u7ea7\u6d4b\u8bd5<\/strong>\uff1a\u4f7f\u7528 WebPageTest \u6216 Lighthouse\uff08\u53ef\u901a\u8fc7\u547d\u4ee4\u884c\u6216\u5728\u7ebf\u7ad9\u70b9\uff09\u8bc4\u4f30\u5b8c\u6574\u9875\u9762\u52a0\u8f7d\u6027\u80fd\u3001\u9996\u5c4f\u6e32\u67d3\uff08First Contentful Paint\uff09\u548c Largest Contentful Paint\uff0c\u5c24\u5176\u5173\u6ce8\u4f7f\u7528 CDN \u540e\u7684\u6539\u5584\u3002<\/li>\n<\/ul>\n<h3>\u4e8c\uff1a\u771f\u5b9e\u7528\u6237\u76d1\u6d4b\uff08RUM\uff09<\/h3>\n<p>\u5408\u6210\u6d4b\u8bd5\u65e0\u6cd5\u8986\u76d6\u771f\u5b9e\u7f51\u7edc\u6ce2\u52a8\u4e0e\u7528\u6237\u5206\u5e03\u3002RUM \u901a\u8fc7\u5728\u9875\u9762\u690d\u5165 JS\uff08\u5982 Performance API\uff09\u6216\u4f7f\u7528\u6d4f\u89c8\u5668\u7aef\u6307\u6807\u6536\u96c6\u6d4f\u89c8\u5668\u7aef\u7684\u771f\u5b9e\u4f53\u9a8c\u6570\u636e\u3002<\/p>\n<ul>\n<li>\u5173\u952e\u6307\u6807\u5305\u62ec\uff1aFirst Byte\uff08TTFB\uff09\u3001First Paint\u3001Largest Contentful Paint\uff08LCP\uff09\u3001Cumulative Layout Shift\uff08CLS\uff09\u548c\u8bf7\u6c42\u5931\u8d25\u7387\u3002<\/li>\n<li>\u5efa\u8bae\u5728\u751f\u4ea7\u73af\u5883\u5f00\u542f\u5206\u6bb5\u91c7\u6837\uff0c\u7edf\u8ba1\u4e0d\u540c\u5730\u57df\uff08\u5982\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u6b27\u6d32\u3001\u4e1c\u4e9a\uff09\u7684\u5ef6\u8fdf\u4e0e\u5931\u8d25\u7387\uff0c\u4ece\u800c\u5224\u65ad CDN \u7684\u5168\u7403\u8986\u76d6\u80fd\u529b\u3002<\/li>\n<\/ul>\n<h3>\u4e09\uff1a\u538b\u529b\u6d4b\u8bd5\u4e0e\u541e\u5410\u80fd\u529b\u6d4b\u91cf<\/h3>\n<p>\u5728\u9884\u53d1\u5e03\u6216\u8d1f\u8f7d\u53ef\u63a7\u65f6\uff0c\u4f7f\u7528\u538b\u529b\u6d4b\u8bd5\u5de5\u5177\u9a8c\u8bc1 CDN \u5728\u5cf0\u503c\u6d41\u91cf\u4e0b\u7684\u7a33\u5b9a\u6027\u4e0e\u56de\u6e90\u538b\u529b\u3002<\/p>\n<ul>\n<li>\u63a8\u8350\u5de5\u5177\uff1ak6\u3001wrk\u3001siege\u3001vegeta\u3001JMeter\u3002<\/li>\n<li>\u6d4b\u8bd5\u8981\u70b9\uff1a\u5e76\u53d1\u8fde\u63a5\u6570\u3001\u8bf7\u6c42\u7387\u3001\u5bf9\u8c61\u51b7\u70ed\u7f13\u5b58\u547d\u4e2d\u3001\u5e26\u5bbd\u4e0a\u9650\u3001HTTP \u9519\u8bef\u7801\u5206\u5e03\uff085xx\u30014xx\uff09\u3002<\/li>\n<li>\u793a\u4f8b\uff1a\u4f7f\u7528 k6 \u751f\u6210\u5927\u91cf\u5e76\u53d1\u8bf7\u6c42\uff0c\u5206\u522b\u6d4b\u8bd5\u51b7\u7f13\u5b58\uff08\u9996\u6b21\u8bf7\u6c42\u5f3a\u5236 purging \u540e\uff09\u4e0e\u70ed\u7f13\u5b58\u4e0b\u7684\u54cd\u5e94\u6027\u80fd\uff0c\u89c2\u5bdf 95th \u548c 99th \u767e\u5206\u4f4d\u54cd\u5e94\u65f6\u95f4\u3002<\/li>\n<li>\u6ce8\u610f\u76d1\u63a7\u6e90\u7ad9\u538b\u529b\uff08\u56de\u6e90 QPS\u3001\u5e26\u5bbd\uff09\u4ee5\u53ca CDN \u62a5\u8868\u4e2d Cache Hit Ratio \u7684\u53d8\u5316\uff0c\u9632\u6b62\u56e0\u7f13\u5b58\u5931\u6548\u9020\u6210\u6e90\u7ad9\u8fc7\u8f7d\u3002<\/li>\n<\/ul>\n<h3>\u56db\uff1a\u5b89\u5168\u4e0e TLS \u6027\u80fd\u6d4b\u8bd5<\/h3>\n<p>TLS \u63e1\u624b\u4e0e\u8bc1\u4e66\u9a8c\u8bc1\u662f\u5f71\u54cd\u9996\u5305\u5ef6\u8fdf\u7684\u91cd\u8981\u56e0\u7d20\u3002\u6d4b\u8bd5\u8981\u70b9\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u68c0\u67e5\u662f\u5426\u5f00\u542f TLS \u4f1a\u8bdd\u590d\u7528\u3001OCSP Stapling\u3001ALPN\uff08\u7528\u4e8e HTTP\/2 \u548c HTTP\/3 \u534f\u5546\uff09\u3002<\/li>\n<li>\u6d4b\u8bd5 TLS \u63e1\u624b\u8017\u65f6\uff1a\u53ef\u901a\u8fc7 openssl s_time \u6216 curl -w \u4e2d\u7684 tls \u8ba1\u65f6\u9879\u6765\u6d4b\u91cf\u3002<\/li>\n<li>\u8bc4\u4f30 DDoS \u9632\u62a4\u3001WAF \u5bf9\u5ef6\u8fdf\u7684\u5f71\u54cd\uff0c\u4f8b\u5982\u5728\u653b\u51fb\u6a21\u62df\u4e0b\u7684\u53ef\u7528\u6027\u4e0e\u8bef\u5c01\u7387\u3002<\/li>\n<\/ul>\n<h2>\u5173\u952e\u6027\u80fd\u6307\u6807\uff08KPI\uff09\u4e0e\u5224\u5b9a\u6807\u51c6<\/h2>\n<p>\u5728\u8fdb\u884c CDN \u6027\u80fd\u8bc4\u4f30\u65f6\uff0c\u4e0b\u5217\u6307\u6807\u5c24\u4e3a\u91cd\u8981\uff0c\u914d\u5408\u767e\u5206\u4f4d\u6570\u4e0e\u5730\u57df\u62c6\u5206\u5224\u65ad\u6548\u679c\uff1a<\/p>\n<ul>\n<li><strong>TTFB\uff08Time To First Byte\uff09<\/strong>\uff1a\u9875\u9762\u6216\u8d44\u6e90\u5f00\u59cb\u8fd4\u56de\u6570\u636e\u7684\u65f6\u95f4\u3002\u7406\u60f3\u503c\uff1a\u5168\u7403\u8282\u70b9 50-200ms\uff0c\u6839\u636e\u5730\u57df\u4e0d\u540c\u53ef\u653e\u5bbd\u3002<\/li>\n<li><strong>\u54cd\u5e94\u65f6\u95f4\uff08P50\/P95\/P99\uff09<\/strong>\uff1a50\u300195\u300199 \u767e\u5206\u4f4d\u54cd\u5e94\u65f6\u95f4\uff0c\u5c24\u5176\u5173\u6ce8 P95\/P99 \u7684\u6296\u52a8\u3002<\/li>\n<li><strong>Cache Hit Ratio\uff08\u7f13\u5b58\u547d\u4e2d\u7387\uff09<\/strong>\uff1a\u9ad8\u547d\u4e2d\u7387\u610f\u5473\u7740\u66f4\u5c11\u56de\u6e90\u3002\u76ee\u6807&gt;90%\uff08\u53d6\u51b3\u4e8e\u5185\u5bb9\u53d8\u66f4\u9891\u7387\uff09\u3002<\/li>\n<li><strong>\u5e26\u5bbd\u5229\u7528\u4e0e\u541e\u5410\uff08Throughput\uff09<\/strong>\uff1a\u5728\u9ad8\u5e76\u53d1\u4e0b\u7684\u7a33\u5b9a\u4f20\u8f93\u901f\u7387\uff0c\u5355\u4f4d\u901a\u5e38\u4e3a Mbps \u6216 Gbps\u3002<\/li>\n<li><strong>\u9519\u8bef\u7387<\/strong>\uff1a4xx\/5xx \u7684\u6bd4\u4f8b\uff0c\u9700\u4f4e\u4e8e\u53ef\u63a5\u53d7\u9608\u503c\uff08\u901a\u5e38 &lt;1%\uff09\uff0c\u5e76\u5173\u6ce8\u5206\u5e03\u4e0e\u6839\u56e0\u3002<\/li>\n<li><strong>\u7a33\u5b9a\u6027\u4e0e\u53ef\u7528\u6027\uff08SLA\uff09<\/strong>\uff1a\u67e5\u770b\u4f9b\u5e94\u5546\u7684 SLA\u3001\u5386\u53f2\u6545\u969c\u8bb0\u5f55\u4e0e\u6062\u590d\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<h2>\u4e0d\u540c\u5e94\u7528\u573a\u666f\u4e0b\u7684\u6d4b\u8bd5\u91cd\u70b9\u4e0e\u5bf9\u6bd4<\/h2>\n<h3>\u9759\u6001\u8d44\u6e90\u52a0\u901f\uff08\u56fe\u7247\u3001JS\u3001CSS\uff09<\/h3>\n<p>\u9759\u6001\u5185\u5bb9\u5bf9\u7f13\u5b58\u7b56\u7565\u4e0e\u8fb9\u7f18\u8282\u70b9\u6570\u91cf\u975e\u5e38\u654f\u611f\u3002\u6d4b\u8bd5\u65f6\u91cd\u70b9\u5173\u6ce8\u7f13\u5b58\u547d\u4e2d\u3001\u5bf9\u8c61\u5927\u5c0f\u5206\u5e03\u3001\u538b\u7f29\u4e0e\u662f\u5426\u652f\u6301 Brotli\u3002\u5bf9\u4e8e\u56fe\u7247\u5efa\u8bae\u5f00\u542f WebP\/AVIF \u8f6c\u7801\u529f\u80fd\u5e76\u6d4b\u8bd5\u5e26\u5bbd\u6548\u7387\u3002<\/p>\n<h3>\u52a8\u6001\/\u63a5\u53e3\u52a0\u901f\uff08API\u3001\u52a8\u6001\u9875\u9762\uff09<\/h3>\n<p>\u52a8\u6001\u5185\u5bb9\u6d4b\u8bd5\u5e94\u8bc4\u4f30\u8fb9\u7f18\u8ba1\u7b97\uff08Edge Compute\uff09\u3001\u7f13\u5b58\u7a7f\u900f\u7b56\u7565\u3001TCP 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