{"id":210400,"date":"2025-10-29T13:51:53","date_gmt":"2025-10-29T05:51:53","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210400\/"},"modified":"2025-10-29T13:51:54","modified_gmt":"2025-10-29T05:51:54","slug":"cdn-393","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210400\/","title":{"rendered":"CDN\u667a\u80fd\u8def\u7531\u4e0e\u7f13\u5b58\u8c03\u5ea6\uff1a\u6253\u9020\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u547d\u4e2d\u7387\u7684\u5b9e\u6218\u7b56\u7565"},"content":{"rendered":"<p>\u5728\u5168\u7403\u5316\u4e92\u8054\u7f51\u73af\u5883\u4e0b\uff0c\u7f51\u7ad9\u548c\u5e94\u7528\u5bf9\u5ef6\u8fdf\u548c\u53ef\u7528\u6027\u7684\u8981\u6c42\u8d8a\u6765\u8d8a\u9ad8\u3002CDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u4e0d\u4ec5\u4ec5\u662f\u628a\u5185\u5bb9\u590d\u5236\u5230\u8fb9\u7f18\u8282\u70b9\u90a3\u4e48\u7b80\u5355\uff0c<strong>\u667a\u80fd\u8def\u7531\u4e0e\u7f13\u5b58\u8c03\u5ea6\uff08cache scheduling\uff09<\/strong>\u7684\u8bbe\u8ba1\u51b3\u5b9a\u4e86\u5b9e\u9645\u7528\u6237\u4f53\u9a8c\u3002\u672c\u6587\u4ece\u539f\u7406\u3001\u5178\u578b\u5e94\u7528\u573a\u666f\u3001\u4f18\u52bf\u5bf9\u6bd4\u53ca\u9009\u8d2d\u5efa\u8bae\u7b49\u65b9\u9762\uff0c\u63d0\u4f9b\u53ef\u843d\u5730\u7684\u6280\u672f\u7b56\u7565\uff0c\u5e2e\u52a9\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u548c\u5f00\u53d1\u8005\u6253\u9020\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u547d\u4e2d\u7387\u7684\u4ea4\u4ed8\u4f53\u7cfb\u3002<\/p>\n<h2>\u539f\u7406\u6982\u8ff0\uff1a\u8def\u7531\u4e0e\u7f13\u5b58\u8c03\u5ea6\u7684\u5173\u952e\u8981\u7d20<\/h2>\n<p>\u8981\u7406\u89e3\u667a\u80fd\u8def\u7531\u4e0e\u7f13\u5b58\u8c03\u5ea6\uff0c\u9700\u628a\u6ce8\u610f\u529b\u653e\u5728\u4e24\u5927\u5c42\u9762\uff1a\u4e00\u662f\u5982\u4f55\u9009\u62e9\u6700\u4f18\u8282\u70b9\u5c06\u8bf7\u6c42\u8def\u7531\u5230\u5408\u9002\u7684 PoP\uff08Point of Presence\uff09\uff1b\u4e8c\u662f\u5982\u4f55\u5728\u8fb9\u7f18\u8282\u70b9\u9ad8\u6548\u7ba1\u7406\u7f13\u5b58\u4ee5\u63d0\u5347\u547d\u4e2d\u7387\u5e76\u964d\u4f4e\u56de\u6e90\u7387\u3002<\/p>\n<h3>\u667a\u80fd\u8def\u7531\u7684\u5e38\u89c1\u7b56\u7565<\/h3>\n<ul>\n<li><strong>Anycast\/BGP+Anycast<\/strong>\uff1a\u901a\u8fc7 Anycast \u5c06\u76f8\u540c IP \u5ba3\u544a\u5728\u591a\u4e2a PoP\uff0c\u914d\u5408 BGP \u7b56\u7565\u5b9e\u73b0\u5168\u5c40\u8def\u7531\u7684\u521d\u7b5b\uff0c\u9002\u5408\u9759\u6001\u5185\u5bb9\u5feb\u901f\u63a5\u5165\u3002<\/li>\n<li><strong>\u57fa\u4e8e RTT\/\u5e26\u5bbd\u7684\u5b9e\u65f6\u63a2\u6d4b<\/strong>\uff1a\u901a\u8fc7\u4e3b\u52a8\u63a2\u6d4b\u5ef6\u8fdf\uff08ICMP\/TCP\/HTTP\/QUIC \u63a2\u6d4b\uff09\u548c\u94fe\u8def\u5e26\u5bbd\uff0c\u6784\u5efa\u5ef6\u8fdf\u77e9\u9635\uff0c\u52a8\u6001\u8c03\u6574\u8def\u7531\u4f18\u5148\u7ea7\u3002<\/li>\n<li><strong>GeoDNS \u4e0e ISP-aware \u8def\u7531<\/strong>\uff1a\u7ed3\u5408\u5730\u7406\u4f4d\u7f6e\u4e0e\u8fd0\u8425\u5546\u4fe1\u606f\uff0c\u4e3a\u7279\u5b9a\u533a\u57df\u6216\u8fd0\u8425\u5546\u9009\u62e9\u6700\u4f18\u8282\u70b9\uff0c\u964d\u4f4e\u8de8\u7f51\u6bb5\u8bbf\u95ee\u5ef6\u8fdf\uff0c\u5e38\u7528\u4e8e\u9488\u5bf9\u9999\u6e2f\u7528\u6237\u7684\u4f18\u5316\u3002<\/li>\n<li><strong>\u8d1f\u8f7d\u4e0e\u5065\u5eb7\u68c0\u67e5<\/strong>\uff1a\u7ed3\u5408\u8282\u70b9\u8d1f\u8f7d\uff08CPU\/\u5185\u5b58\/\u5e26\u5bbd\uff09\u548c\u670d\u52a1\u5065\u5eb7\u68c0\u67e5\uff08TCP\/TLS \u63e1\u624b\u6210\u529f\u7387\uff09\uff0c\u5728\u5f02\u5e38\u65f6\u8fdb\u884c\u6545\u969c\u8f6c\u79fb\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u8c03\u5ea6\u4e0e\u6dd8\u6c70\u7b56\u7565<\/h3>\n<ul>\n<li><strong>\u7f13\u5b58\u952e\u4e0e\u5f52\u4e00\u5316<\/strong>\uff1a\u5bf9 URL\u3001\u67e5\u8be2\u53c2\u6570\u3001Cookie \u505a\u89c4\u8303\u5316\uff0c\u786e\u5b9a\u4e00\u81f4\u7684\u7f13\u5b58\u952e\uff0c\u907f\u514d\u7f13\u5b58\u788e\u7247\u5316\u3002<\/li>\n<li><strong>\u66ff\u6362\u7b97\u6cd5<\/strong>\uff1a\u5e38\u7528 LRU\u3001LFU \u53ca\u5b83\u4eec\u7684\u6df7\u5408\u53d8\u4f53\uff08\u5982 LRU-K\u3001ARC\uff09\uff0c\u4ee5\u53ca\u57fa\u4e8e\u5bf9\u8c61\u70ed\u5ea6\u7684\u81ea\u9002\u5e94\u7b56\u7565\u6765\u63d0\u9ad8\u547d\u4e2d\u7387\u3002<\/li>\n<li><strong>\u5206\u5c42\u7f13\u5b58\uff08Origin Shield\uff09<\/strong>\uff1a\u5728\u8fb9\u7f18\u4e4b\u4e0a\u589e\u52a0\u4e2d\u95f4\u5c42\u4fdd\u62a4\u539f\u70b9\u670d\u52a1\u5668\uff0c\u51cf\u5c11\u56de\u6e90\u9891\u7387\uff0c\u5bf9\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u6d77\u5916\u670d\u52a1\u5668\u56de\u6e90\u65f6\u6548\u679c\u663e\u8457\u3002<\/li>\n<li><strong>\u52a8\u6001 TTL \u4e0e\u4e3b\u52a8\u9884\u53d6<\/strong>\uff1a\u5bf9\u4e0d\u540c\u7c7b\u578b\u5185\u5bb9\uff08\u9759\u6001\u3001\u534a\u52a8\u6001\u3001\u52a8\u6001\uff09\u8bbe\u7f6e\u5dee\u5f02\u5316 TTL\uff0c\u5e76\u7ed3\u5408\u6d41\u91cf\u9884\u6d4b\u8fdb\u884c\u4e3b\u52a8\u9884\u70ed\uff08prefetch\uff09\u6216\u5ef6\u8fdf\u518d\u751f\uff08stale-while-revalidate\uff09\u3002<\/li>\n<li><strong>\u7f13\u5b58\u4e00\u81f4\u6027\u4e0e\u5931\u6548<\/strong>\uff1a\u652f\u6301\u57fa\u4e8e URL\u3001Tag \u6216 API \u7684\u7cbe\u786e\u5931\u6548\uff0c\u7ed3\u5408\u6279\u91cf\u65e0\u6548\u5316\u4e0e\u6e10\u8fdb\u5f0f\u5931\u6548\u51cf\u5c0f\u6296\u52a8\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\u4e0e\u6280\u672f\u843d\u5730<\/h2>\n<h3>\u9759\u6001\u7ad9\u70b9\u4e0e\u5927\u6587\u4ef6\u5206\u53d1<\/h3>\n<p>\u5bf9\u4e8e\u9759\u6001\u8d44\u6e90\uff08\u56fe\u7247\u3001\u89c6\u9891\u3001\u5b89\u88c5\u5305\uff09\uff0c\u4f18\u5148\u7b56\u7565\u662f\u901a\u8fc7 Anycast + \u5927\u89c4\u6a21\u8fb9\u7f18 PoP \u90e8\u7f72\u5b9e\u73b0\u7f51\u7edc\u63a5\u8fd1\u6027\uff1b\u7f13\u5b58\u7b56\u7565\u4ee5\u957f\u671f TTL \u4e3a\u4e3b\uff0c\u4f7f\u7528\u5206\u5757\u4f20\u8f93\u4e0e\u65ad\u70b9\u7eed\u4f20\u652f\u6301\u5927\u6587\u4ef6\u3002\u82e5\u76ee\u6807\u7528\u6237\u96c6\u4e2d\u5728\u9999\u6e2f\u6216\u4e1c\u4e9a\uff0c\u53ef\u4f18\u5148\u9009\u62e9\u9999\u6e2f\u670d\u52a1\u5668\u3001\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u548c\u65b0\u52a0\u5761\u670d\u52a1\u5668\u7684 PoP \u5206\u5e03\uff0c\u4ee5\u964d\u4f4e\u6700\u540e\u4e00\u8df3\u5ef6\u8fdf\u3002<\/p>\n<h3>\u52a8\u6001\u5185\u5bb9\u4e0e API \u52a0\u901f<\/h3>\n<p>\u52a8\u6001\u5185\u5bb9\u901a\u5e38\u9700\u8981\u66f4\u7ec6\u7c92\u5ea6\u7684\u8def\u7531\u51b3\u7b56\u548c\u667a\u80fd\u7f13\u5b58\uff1a\u91c7\u7528\u8fb9\u7f18\u8ba1\u7b97\uff08Edge Compute\uff09\u6216 Edge-Worker \u6267\u884c\u8f7b\u91cf\u4e1a\u52a1\u903b\u8f91\uff0c\u7ed3\u5408\u667a\u80fd\u8def\u7531\u628a\u8bf7\u6c42\u8def\u7531\u5230\u5e26\u6709\u4f1a\u8bdd\u4eb2\u548c\u6216\u5df2\u7f13\u5b58\u90e8\u5206\u6570\u636e\u7684\u8282\u70b9\u3002\u5bf9\u9700\u8981\u9274\u6743\u7684 API\uff0c\u5efa\u8bae\u4f7f\u7528\u77ed\u65f6\u53ef\u7f13\u5b58\u7684\u54cd\u5e94\uff08cache-control: s-maxage\uff09\u5e76\u5b9e\u73b0\u5b89\u5168\u7b7e\u540d\u3002<\/p>\n<h3>\u5168\u7403\u591a\u533a\u57df\u90e8\u7f72\u4e0e\u707e\u5907<\/h3>\n<p>\u4f01\u4e1a\u7ea7\u7528\u6237\u5f80\u5f80\u9700\u8981\u8de8\u533a\u57df\u4e00\u81f4\u4f53\u9a8c\u3002\u7ed3\u5408 GeoDNS\u3001Anycast \u4e0e\u5b9e\u65f6\u5ef6\u8fdf\u63a2\u6d4b\u53ef\u4ee5\u5b9e\u73b0\u8de8\u533a\u57df\u6d41\u91cf\u5206\u6d41\u3002\u5bf9\u8de8\u56fd\u7ad9\u70b9\uff0c\u53ef\u5728\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u6216\u65e5\u672c\u7b49\u5730\u90e8\u7f72\u673a\u623f\u548c <a href=\"https:\/\/server.hk\/server.php\">\u9999\u6e2f\u670d\u52a1\u5668<\/a> \u6216\u7f8e\u56fd\u670d\u52a1\u5668\u4f5c\u4e3a\u4e3b\u5907\u6e90\u7ad9\uff0c\u5229\u7528\u667a\u80fd\u8def\u7531\u5728\u53d1\u751f\u94fe\u8def\u6296\u52a8\u65f6\u5b9e\u73b0\u5c31\u8fd1\u5207\u6362\u3002<\/p>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1a\u667a\u80fd\u8c03\u5ea6 vs \u4f20\u7edf CDN<\/h2>\n<ul>\n<li><strong>\u5ef6\u8fdf\u4e0e\u7a33\u5b9a\u6027<\/strong>\uff1a\u667a\u80fd\u8c03\u5ea6\u901a\u8fc7\u5b9e\u65f6\u63a2\u6d4b\u548c\u8d1f\u8f7d\u611f\u77e5\u9009\u62e9\u8def\u5f84\uff0c\u80fd\u663e\u8457\u964d\u4f4e 50% \u4ee5\u4e0a\u7684\u5c3e\u5ef6\u8fdf\uff08P95\/P99\uff09\uff0c\u5c24\u5176\u5728\u7f51\u7edc\u6ce2\u52a8\u65f6\u4f18\u4e8e\u5355\u4e00\u9759\u6001\u8def\u7531\u7684\u4f20\u7edf CDN\u3002<\/li>\n<li><strong>\u7f13\u5b58\u547d\u4e2d\u7387<\/strong>\uff1a\u901a\u8fc7\u70ed\u5ea6\u9884\u6d4b\u3001\u9884\u53d6\u4e0e\u5206\u5c42\u7f13\u5b58\u53ef\u5c06\u547d\u4e2d\u7387\u63d0\u5347 10%-30%\uff0c\u51cf\u5c11\u56de\u6e90\u6d41\u91cf\u548c\u6e90\u7ad9\u538b\u529b\u3002<\/li>\n<li><strong>\u6210\u672c\u63a7\u5236<\/strong>\uff1a\u66f4\u9ad8\u7684\u547d\u4e2d\u7387\u76f4\u63a5\u5e26\u6765\u56de\u6e90\u5e26\u5bbd\u3001\u6e90\u7ad9 CPU \u4f7f\u7528\u7684\u964d\u4f4e\uff1b\u5206\u5c42\u7f13\u5b58\u548c\u7f13\u5b58\u7b56\u7565\u7684\u7ec6\u5316\u8fd8\u80fd\u4f18\u5316\u5b58\u50a8\u548c\u5e26\u5bbd\u6210\u672c\u3002<\/li>\n<li><strong>\u590d\u6742\u6027\u4e0e\u8fd0\u7ef4<\/strong>\uff1a\u667a\u80fd\u7b56\u7565\u5f15\u5165\u66f4\u591a\u5ea6\u91cf\u4e0e\u53cd\u9988\u56de\u8def\uff0c\u9700\u8981\u5b8c\u5584\u7684\u89c2\u6d4b\u5e73\u53f0\u4e0e\u81ea\u52a8\u5316\u89c4\u5219\uff0c\u5426\u5219\u53ef\u80fd\u51fa\u73b0\u8bef\u5224\u6216\u6296\u52a8\u3002<\/li>\n<\/ul>\n<h2>\u9009\u8d2d\u4e0e\u5b9e\u65bd\u5efa\u8bae<\/h2>\n<h3>\u8bc4\u4f30\u5173\u952e\u6307\u6807<\/h3>\n<ul>\n<li>POPs 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