{"id":209863,"date":"2025-10-24T00:25:29","date_gmt":"2025-10-23T16:25:29","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209863\/"},"modified":"2025-10-24T00:25:30","modified_gmt":"2025-10-23T16:25:30","slug":"cdn-165","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209863\/","title":{"rendered":"\u7cbe\u51c6\u6d4b\u91cf\u4e0e\u4f18\u5316\uff1aCDN\u8bbf\u95ee\u5ef6\u8fdf\u5b9e\u6218\u6307\u5357"},"content":{"rendered":"<p>\u5728\u5168\u7403\u5316\u548c\u5206\u5e03\u5f0f\u67b6\u6784\u5feb\u901f\u53d1\u5c55\u7684\u5f53\u4e0b\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u6210\u4e3a\u63d0\u5347\u7f51\u7ad9\u54cd\u5e94\u901f\u5ea6\u548c\u7528\u6237\u4f53\u9a8c\u7684\u5173\u952e\u7ec4\u4ef6\u3002\u51c6\u786e\u6d4b\u91cf\u4e0e\u6301\u7eed\u4f18\u5316\u8bbf\u95ee\u5ef6\u8fdf\uff0c\u4e0d\u4ec5\u80fd\u591f\u63d0\u5347\u9996\u9875\u6253\u5f00\u901f\u5ea6\u3001\u964d\u4f4e\u8df3\u51fa\u7387\uff0c\u8fd8\u80fd\u4e3a\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\u63d0\u4f9b\u91cf\u5316\u7684\u6027\u80fd\u6539\u8fdb\u65b9\u5411\u3002\u672c\u6587\u5c06\u4ece\u539f\u7406\u3001\u5b9e\u6218\u6d4b\u91cf\u65b9\u6cd5\u3001\u4f18\u5316\u7b56\u7565\u4e0e\u9009\u8d2d\u5efa\u8bae\u56db\u4e2a\u5c42\u9762\u5c55\u5f00\uff0c\u7ed3\u5408\u5178\u578b\u7684\u573a\u666f\u4e0e\u5de5\u5177\u4ecb\u7ecd\uff0c\u5e2e\u52a9\u4f60\u5728\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u7b49\u591a\u533a\u57df\u73af\u5883\u4e0b\u8fdb\u884c\u7cbe\u51c6\u8c03\u4f18\u3002<\/p>\n<h2>CDN \u5ef6\u8fdf\u7684\u57fa\u672c\u539f\u7406\u4e0e\u5173\u952e\u5f71\u54cd\u56e0\u7d20<\/h2>\n<p>\u7406\u89e3\u5ef6\u8fdf\uff08latency\uff09\u7684\u6765\u6e90\u662f\u4f18\u5316\u7684\u7b2c\u4e00\u6b65\u3002CDN \u7684\u8bbf\u95ee\u5ef6\u8fdf\u901a\u5e38\u7531\u4ee5\u4e0b\u51e0\u4e2a\u9636\u6bb5\u53e0\u52a0\u6784\u6210\uff1a<\/p>\n<ul>\n<li>DNS \u89e3\u6790\u65f6\u95f4\uff08DNS Lookup\uff09\uff1a\u57df\u540d\u89e3\u6790\u5230 CDN \u8fb9\u7f18\u8282\u70b9\u7684\u65f6\u95f4\u3002<\/li>\n<li>TCP \u63e1\u624b\u4e0e\u4e09\u6b21\u63e1\u624b\u5ef6\u8fdf\uff08TCP Handshake\uff09\uff1a\u5efa\u7acb\u8fde\u63a5\u6240\u9700\u5f80\u8fd4\u65f6\u5ef6\u3002<\/li>\n<li>TLS \u63e1\u624b\uff08\u82e5\u4f7f\u7528 HTTPS\uff09\uff1a\u8bc1\u4e66\u9a8c\u8bc1\u3001\u5bc6\u94a5\u4ea4\u6362\u5bfc\u81f4\u7684\u989d\u5916 RTT\u3002<\/li>\n<li>\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB, Time To First Byte\uff09\uff1a\u8fb9\u7f18\u8282\u70b9\u54cd\u5e94\u5e76\u8fd4\u56de\u9996\u5305\u6240\u9700\u65f6\u95f4\u3002<\/li>\n<li>\u4f20\u8f93\u65f6\u95f4\uff08Transfer\/Download\uff09\uff1a\u6570\u636e\u901a\u8fc7\u7f51\u7edc\u94fe\u8def\u4f20\u8f93\u7684\u8017\u65f6\uff0c\u53d7\u5e26\u5bbd\u4e0e\u4e22\u5305\u5f71\u54cd\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u6e32\u67d3\u65f6\u95f4\uff1a\u6d4f\u89c8\u5668\u89e3\u6790\u3001\u6e32\u67d3\u8d44\u6e90\u7684\u65f6\u95f4\uff08\u4e3b\u8981\u7531\u524d\u7aef\u4f18\u5316\u51b3\u5b9a\uff09\u3002<\/li>\n<\/ul>\n<p>\u6b64\u5916\uff0cCDN \u7684\u5185\u90e8\u8c03\u5ea6\uff08\u5982 POP \u9009\u62e9\u7b56\u7565\u3001Anycast \u8def\u7531\u3001\u5065\u5eb7\u68c0\u67e5\u3001\u7f13\u5b58\u547d\u4e2d\u7387\uff09\u4e5f\u76f4\u63a5\u51b3\u5b9a\u7528\u6237\u4e0e\u6700\u8fd1\u8fb9\u7f18\u8282\u70b9\u7684\u771f\u5b9e RTT\u3002\u533a\u57df\u6027\u7f51\u7edc\u8d28\u91cf\uff08\u4f8b\u5982\u6e2f\u6fb3\u4e0e\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u3001\u65b0\u52a0\u5761\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u4e92\u8054\u8d28\u91cf\uff09\u4f1a\u5bfc\u81f4\u663e\u8457\u5dee\u5f02\u3002<\/p>\n<h2>\u7cbe\u51c6\u6d4b\u91cf\u65b9\u6cd5\uff1a\u5efa\u7acb\u53ef\u4fe1\u8d56\u7684\u5ef6\u8fdf\u6570\u636e\u94fe<\/h2>\n<p>\u6d4b\u91cf\u8981\u505a\u5230\u201c\u7cbe\u51c6\u201d\u4e0e\u201c\u53ef\u590d\u73b0\u201d\uff0c\u9700\u8981\u7cfb\u7edf\u5316\u65b9\u6cd5\uff0c\u800c\u4e0d\u662f\u5355\u6b21 ping\u3002\u4e0b\u9762\u5217\u51fa\u63a8\u8350\u7684\u5b9e\u6218\u65b9\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<h3>1. \u591a\u5c42\u9762\u6570\u636e\u91c7\u96c6\uff1a\u5408\u5e76\u4e3b\u52a8\u4e0e\u88ab\u52a8\u76d1\u6d4b<\/h3>\n<ul>\n<li><strong>\u88ab\u52a8\u76d1\u6d4b\uff08RUM\uff0c\u771f\u5b9e\u7528\u6237\u76d1\u63a7\uff09<\/strong>\uff1a\u5728\u9875\u9762\u4e2d\u6ce8\u5165\u8f7b\u91cf\u811a\u672c\uff08\u5982 Navigation Timing\u3001Resource Timing\u3001Performance API\uff09\uff0c\u6536\u96c6\u771f\u5b9e\u7528\u6237\u7684 DNS\u3001TCP\u3001TLS\u3001TTFB\u3001\u52a0\u8f7d\u5b8c\u6210\u65f6\u95f4\u3002\u4f18\u52bf\u662f\u6700\u771f\u5b9e\uff0c\u4f46\u53d7\u6837\u672c\u5206\u5e03\u5f71\u54cd\u3002<\/li>\n<li><strong>\u4e3b\u52a8\u5408\u6210\u76d1\u6d4b\uff08Synthetic Monitoring\uff09<\/strong>\uff1a\u4ece\u4e0d\u540c\u57ce\u5e02\/\u8fd0\u8425\u5546\u5b9a\u671f\u53d1\u8d77 HTTP \u8bf7\u6c42\uff0c\u8bb0\u5f55\u5168\u94fe\u8def\u65f6\u95f4\u3002\u9002\u5408\u5bf9\u6bd4\u4e0d\u540c POP \u7684\u8868\u73b0\u548c\u56de\u5f52\u68c0\u6d4b\u3002<\/li>\n<li><strong>\u8fb9\u7f18\u65e5\u5fd7\u4e0e CDN \u539f\u751f\u6307\u6807<\/strong>\uff1a\u5206\u6790 CDN \u63d0\u4f9b\u7684\u8fb9\u7f18\u65e5\u5fd7\uff08\u8bf7\u6c42\u65f6\u95f4\u6233\u3001Cache-Hit\/ Miss\u3001\u4e0a\u6e38\u56de\u6e90\u65f6\u95f4\uff09\uff0c\u53ef\u4ee5\u5b9a\u4f4d\u662f\u7f13\u5b58\u672a\u547d\u4e2d\u5bfc\u81f4\u56de\u6e90\u5ef6\u8fdf\u8fd8\u662f\u7f51\u7edc\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h3>2. \u4f7f\u7528\u6b63\u786e\u7684\u5de5\u5177\u4e0e\u6307\u6807<\/h3>\n<ul>\n<li>\u7f51\u7edc\u5c42\u5de5\u5177\uff1aping\u3001traceroute \/ mtr\uff08\u8def\u7531\u4e0e\u4e22\u5305\u6392\u67e5\uff09\u3001tcptraceroute\uff08TCP \u5c42\u8def\u7531\uff09\u3002\u6ce8\u610f\uff1aICMP \u53ef\u80fd\u88ab\u8fc7\u6ee4\uff0c\u9700\u7ed3\u5408 TCP\/HTTP \u5c42\u5de5\u5177\u3002<\/li>\n<li>\u5e94\u7528\u5c42\u5de5\u5177\uff1acurl\uff08\u5e26 &#8211;resolve \u6216 &#8211;interface \u6a21\u62df\u7279\u5b9a\u51fa\u53e3\uff09\u3001hey \/ wrk\uff08\u538b\u529b\u4e0e\u5e76\u53d1\u573a\u666f\uff09\u3001openssl s_client\uff08TLS \u63e1\u624b\u5206\u6790\uff09\u3002<\/li>\n<li>\u6d4f\u89c8\u5668\u5c42\u6d4b\u91cf\uff1aChrome DevTools\u3001Lighthouse\u3001WebPageTest\uff08\u53ef\u9488\u5bf9\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u7845\u8c37\u7b49\u8282\u70b9\u8fdb\u884c\u6d4b\u8bd5\uff09\uff0c\u5173\u6ce8 TTFB\u3001First Contentful Paint \u7b49\u3002<\/li>\n<li>\u7edf\u8ba1\u6307\u6807\uff1a\u4e2d\u4f4d\u6570\uff08p50\uff09\u3001\u9ad8\u5206\u4f4d\uff08p90\u3001p95\u3001p99\uff09\u6bd4\u5e73\u5747\u503c\u66f4\u6709\u610f\u4e49\uff0c\u7528\u4e8e\u53cd\u6620\u5c3e\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n<h3>3. \u8bbe\u8ba1\u7b26\u5408\u7edf\u8ba1\u5b66\u7684\u6d4b\u8bd5\u65b9\u6848<\/h3>\n<ul>\n<li>\u91c7\u6837\u8986\u76d6\uff1a\u5728\u4e0d\u540c\u65f6\u95f4\u6bb5\u3001\u4e0d\u540c ISP\u3001\u4e0d\u540c\u5ba2\u6237\u7aef\u5730\u7406\u4f4d\u7f6e\u8fdb\u884c\u91c7\u6837\uff0c\u907f\u514d\u5cf0\u503c\u6216\u7f51\u7edc\u5f02\u5e38\u9020\u6210\u504f\u5dee\u3002<\/li>\n<li>\u6d88\u9664\u51b7\u542f\u52a8\u6548\u5e94\uff1a\u7f13\u5b58\u9996\u6b21\u547d\u4e2d\u4e0e\u7a33\u5b9a\u547d\u4e2d\u5b58\u5728\u5dee\u5f02\uff0c\u5e94\u5206\u522b\u7edf\u8ba1 Cache-Miss \u4e0e Cache-Hit \u7684\u5ef6\u8fdf\u3002<\/li>\n<li>\u91cd\u590d\u6d4b\u8bd5\u5e76\u8bb0\u5f55\u73af\u5883\u53d8\u91cf\uff1a\u4f8b\u5982 DNS TTL\u3001CDN \u914d\u7f6e\u53d8\u66f4\u3001\u8bc1\u4e66\u66f4\u65b0\u90fd\u4f1a\u5f71\u54cd\u7ed3\u679c\u3002<\/li>\n<\/ul>\n<h2>\u5ef6\u8fdf\u4f18\u5316\u7b56\u7565\uff1a\u4ece\u7f51\u7edc\u5230\u5e94\u7528\u7684\u5168\u6808\u624b\u6bb5<\/h2>\n<p>\u5728\u660e\u786e\u4e86\u74f6\u9888\u540e\uff0c\u53ef\u4ee5\u4ece\u4ee5\u4e0b\u51e0\u4e2a\u7ef4\u5ea6\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n<h3>\u7f51\u7edc\u4e0e CDN \u914d\u7f6e\u5c42\u9762<\/h3>\n<ul>\n<li><strong>\u9009\u62e9\u5408\u9002\u7684 POP \u5e03\u5c40\u4e0e Anycast \u533a\u57df<\/strong>\uff1a\u9488\u5bf9\u76ee\u6807\u7528\u6237\u5206\u5e03\uff08\u9999\u6e2f\u3001\u65e5\u97e9\u3001\u65b0\u52a0\u5761\u3001\u7f8e\u56fd\u7b49\uff09\uff0c\u4f18\u5148\u9009\u62e9\u4e34\u8fd1 POP\u3002\u5bf9\u8de8\u56fd\u4e1a\u52a1\u540c\u65f6\u90e8\u7f72\u9999\u6e2f\u670d\u52a1\u5668\u4e0e\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u4f7f\u7528\u5168\u7403 CDN \u591a\u533a\u57df\u8986\u76d6\uff0c\u53ef\u4ee5\u663e\u8457\u964d\u4f4e\u8de8\u6d0b\u5ef6\u8fdf\u3002<\/li>\n<li><strong>\u542f\u7528 TCP \u4f18\u5316<\/strong>\uff1aKeep-Alive\u3001\u8fde\u63a5\u590d\u7528\u3001TCP Fast Open\uff08\u82e5\u652f\u6301\uff09\u3001\u9002\u5f53\u7684\u62e5\u585e\u63a7\u5236\uff08BBR\uff09\u90fd\u80fd\u964d\u4f4e\u63e1\u624b\u4e0e\u5c0f\u5bf9\u8c61\u4f20\u8f93\u5ef6\u8fdf\u3002<\/li>\n<li><strong>TLS \u4f18\u5316<\/strong>\uff1a\u5f00\u542f TLS 1.3\u3001\u4f7f\u7528 ECDHE \u4e0e\u9759\u6001\u5bc6\u94a5\u5957\u4ef6\u3001\u542f\u7528\u4f1a\u8bdd\u6062\u590d\uff08Session IDs \/ TLS tickets\uff09\u3001OCSP Stapling\uff0c\u53ef\u51cf\u5c11\u63e1\u624b RTT\u3002<\/li>\n<li><strong>DNS \u4f18\u5316<\/strong>\uff1a\u4f7f\u7528 Anycast DNS\u3001\u5408\u7406\u8bbe\u7f6e TTL\u3001\u90e8\u7f72\u5168\u7403 DNS \u89e3\u6790\u8282\u70b9\uff0c\u51cf\u5c11 DNS Lookup \u65f6\u95f4\u3002\u540c\u65f6\u68c0\u6d4b\u57df\u540d\u6ce8\u518c\u4e0e DNS \u670d\u52a1\u7684\u7a33\u5b9a\u6027\uff08\u57df\u540d\u6ce8\u518c\u4e0e DNS \u89e3\u6790\u7d27\u5bc6\u76f8\u5173\uff09\u3002<\/li>\n<li><strong>\u7f13\u5b58\u7b56\u7565\u4e0e\u8fb9\u7f18\u7f13\u5b58\u9884\u70ed<\/strong>\uff1a\u5408\u7406\u5212\u5206 Cache-Control\u3001Stale-while-revalidate\uff0c\u5229\u7528\u8fb9\u7f18\u9884\u70ed\uff08warm-up\uff09\u6216 Origin Pull 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