{"id":209801,"date":"2025-10-23T23:22:26","date_gmt":"2025-10-23T15:22:26","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209801\/"},"modified":"2025-10-23T23:22:27","modified_gmt":"2025-10-23T15:22:27","slug":"cdn-136","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209801\/","title":{"rendered":"CDN\u8282\u70b9\u8986\u76d6\u5bf9\u6bd4\uff1a\u8c01\u80fd\u771f\u6b63\u5b9e\u73b0\u5168\u7403\u52a0\u901f\uff1f"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u5168\u7403\u5316\u7684\u7f51\u7ad9\u548c\u5e94\u7528\u90e8\u7f72\u4e2d\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u5df2\u7ecf\u6210\u4e3a\u63d0\u5347\u8bbf\u95ee\u901f\u5ea6\u548c\u7a33\u5b9a\u6027\u7684\u5173\u952e\u6280\u672f\u3002\u4f46\u5728\u201c\u5168\u7403\u52a0\u901f\u201d\u8fd9\u4e00\u627f\u8bfa\u80cc\u540e\uff0cCDN\u8282\u70b9\u7684<span 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302\/307\u5c06\u7528\u6237\u8bf7\u6c42\u6307\u5411\u6700\u8fd1\u6216\u6700\u4f18\u8282\u70b9\u3002<\/li>\n<li>\u8fb9\u7f18\u7f13\u5b58\uff1a\u9759\u6001\u8d44\u6e90\u5728\u8fb9\u7f18\u8282\u70b9\u7f13\u5b58\uff0c\u964d\u4f4e\u56de\u6e90\u8bf7\u6c42\u9891\u7387\uff0c\u63d0\u5347\u547d\u4e2d\u7387\uff08cache hit ratio\uff09\u3002<\/li>\n<li>\u56de\u6e90\u4e0e\u56de\u6e90\u4f18\u5316\uff1a\u5f53\u8fb9\u7f18\u65e0\u7f13\u5b58\u65f6\uff0c\u56de\u6e90\u5230\u4e3b\u7ad9\uff08origin\uff09\uff0c\u5e38\u89c1\u4f18\u5316\u5305\u62ecOrigin Shield\u3001\u56de\u6e90\u5e26\u5bbd\u538b\u7f29\u548cTLS\u4f1a\u8bdd\u590d\u7528\u3002<\/li>\n<\/ul>\n<h3>\u51b3\u5b9a\u7528\u6237\u4f53\u9a8c\u7684\u5173\u952e\u6307\u6807<\/h3>\n<ul>\n<li><strong>\u5ef6\u8fdf\uff08Latency\uff09<\/strong>\uff1a\u901a\u5e38\u4ee5RTT\u8861\u91cf\uff0c\u5730\u7406\u8ddd\u79bb\u3001ISP\u4e4b\u95f4\u7684\u4e92\u8054\u548c\u8def\u7531\u7b56\u7565\u76f4\u63a5\u5f71\u54cd\u3002<\/li>\n<li><strong>\u541e\u5410\uff08Throughput\uff09\u4e0e\u5e26\u5bbd<\/strong>\uff1a\u51b3\u5b9a\u5927\u6587\u4ef6\u4e0b\u8f7d\u6216\u89c6\u9891\u6d41\u5a92\u4f53\u7684\u901f\u5ea6\u3002<\/li>\n<li><strong>TTFB\uff08Time to First Byte\uff09<\/strong>\uff1a\u8861\u91cf\u5728\u9996\u6b21\u5b57\u8282\u5230\u8fbe\u524d\u7684\u603b\u4f53\u5ef6\u8fdf\uff0c\u53d7DNS\u89e3\u6790\u3001TCP\/TLS\u63e1\u624b\u548c\u8fb9\u7f18\u54cd\u5e94\u65f6\u95f4\u5f71\u54cd\u3002<\/li>\n<li><strong>Cache Hit Ratio\uff08\u7f13\u5b58\u547d\u4e2d\u7387\uff09<\/strong>\uff1a\u9ad8\u547d\u4e2d\u7387\u80fd\u663e\u8457\u964d\u4f4e\u539f\u7ad9\u538b\u529b\u548c\u56de\u6e90\u5ef6\u8fdf\u3002<\/li>\n<li><strong>\u53ef\u7528\u6027\u4e0e\u7a33\u5b9a\u6027<\/strong>\uff1a\u8282\u70b9\u7684\u5197\u4f59\u3001\u6d41\u91cf\u8c03\u5ea6\u4e0eDDoS\u9632\u62a4\u80fd\u529b\u3002<\/li>\n<\/ul>\n<h2>\u8282\u70b9\u8986\u76d6\u7684\u90e8\u7f72\u7b56\u7565\u4e0e\u6280\u672f\u5b9e\u73b0\u7ec6\u8282<\/h2>\n<h3>Anycast\u4e0eBGP\u8def\u7531\u4f18\u5316<\/h3>\n<p>\u5927\u591a\u6570\u5927\u578bCDN\u91c7\u7528Anycast\u5c06\u540c\u4e00IP\u90e8\u7f72\u5728\u591a\u4e2aPoP\uff0c\u901a\u8fc7BGP\u9009\u62e9\u6700\u8fd1\u6216\u6700\u6709\u5229\u7684\u7f51\u7edc\u8def\u5f84\u3002Anycast\u7684\u4f18\u70b9\u662f\u8def\u7531\u5c42\u9762\u7684\u5feb\u901f\u8f6c\u79fb\u4e0e\u5bb9\u707e\uff0c\u4f46\u5176\u6548\u679c\u4f9d\u8d56\u4e8e\u5404ISP\u7684BGP\u7b56\u7565\u4e0e\u5168\u7403\u8def\u7531\u6536\u655b\u7279\u6027\u3002\u5bf9\u4e2d\u56fd\u5927\u9646\u3001\u9999\u6e2f\u3001\u65e5\u97e9\u7b49\u533a\u57df\uff0c\u8fd0\u8425\u5546\u7684\u4e92\u8054\u7b56\u7565\u4f1a\u76f4\u63a5\u5f71\u54cdAnycast\u7684\u6700\u7ec8\u9009\u62e9\u8282\u70b9\u3002<\/p>\n<h3>\u8fb9\u7f18\u8ba1\u7b97\u4e0e\u52a8\u9759\u5206\u79bb<\/h3>\n<p>\u73b0\u4ee3CDN\u4e0d\u4ec5\u505a\u7f13\u5b58\uff0c\u8fd8\u652f\u6301\u8fb9\u7f18\u8ba1\u7b97\uff08Edge Functions\u3001Workers\uff09\uff0c\u5141\u8bb8\u5728\u8fb9\u7f18\u6267\u884c\u903b\u8f91\u4ee5\u51cf\u5c11\u56de\u6e90\u9700\u6c42\u3002\u52a8\u9759\u5206\u79bb\u7b56\u7565\uff1a\u628a\u9759\u6001\u8d44\u6e90\u5f3a\u7f13\u5b58\u4e8e\u8fb9\u7f18\u8282\u70b9\uff0c\u52a8\u6001\u63a5\u53e3\u901a\u8fc7API\u7f51\u5173\u6216\u667a\u80fd\u8def\u7531\u81f3\u6700\u8fd1\u7684\u5e94\u7528\u5b9e\u4f8b\uff0c\u8fd9\u5bf9\u4e8e\u591a\u5730\u90e8\u7f72\uff08\u5982\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\u4e3a\u540e\u7aef\uff09\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h3>\u4f20\u8f93\u534f\u8bae\u4e0e\u5b89\u5168\uff1aQUIC\/HTTP\/2\/TLS<\/h3>\n<p>\u91c7\u7528QUIC\/HTTP\/3\u80fd\u663e\u8457\u964d\u4f4e\u8fde\u63a5\u5efa\u7acb\u65f6\u95f4\u548c\u51cf\u5c11\u4e22\u5305\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\uff0c\u5c24\u5176\u5728\u9ad8\u5ef6\u8fdf\u6216\u79fb\u52a8\u7f51\u7edc\u73af\u5883\u4e0b\u8868\u73b0\u66f4\u597d\u3002TLS\u52a0\u901f\uff08TLS session 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vs 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