{"id":210111,"date":"2025-10-24T05:51:06","date_gmt":"2025-10-23T21:51:06","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210111\/"},"modified":"2025-10-24T05:51:07","modified_gmt":"2025-10-23T21:51:07","slug":"cdn-285","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210111\/","title":{"rendered":"CDN\u8fb9\u7f18\u8ba1\u7b97\u67b6\u6784\u521b\u65b0\uff1a\u7a81\u7834\u5ef6\u8fdf\u4e0e\u6548\u7387\u74f6\u9888"},"content":{"rendered":"<p>\u5728\u4e92\u8054\u7f51\u670d\u52a1\u5bf9\u5b9e\u65f6\u6027\u548c\u7528\u6237\u4f53\u9a8c\u8981\u6c42\u65e5\u76ca\u82db\u523b\u7684\u4eca\u5929\uff0c\u4f20\u7edf\u7684\u96c6\u4e2d\u5f0fCDN\u67b6\u6784\u5df2\u96be\u4ee5\u6ee1\u8db3\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u6548\u7387\u548c\u53ef\u6269\u5c55\u6027\u7684\u5168\u9762\u9700\u6c42\u3002\u4e3a\u5e94\u5bf9\u8fd9\u4e00\u6311\u6218\uff0c<strong>CDN\u8fb9\u7f18\u8ba1\u7b97\u67b6\u6784\uff08Edge 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Anycast<\/strong>\uff1a\u540c\u4e00IP\u5728\u591a\u4e2aPOP\u5e7f\u544a\uff0c\u7528\u6237\u6d41\u91cf\u88ab\u81ea\u52a8\u5f15\u5bfc\u5230\u6700\u8fd1\u6216\u6700\u4f18\u7684POP\uff0c\u964d\u4f4e\u8def\u7531\u65f6\u5ef6\u3002<\/li>\n<li><strong>\u667a\u80fdDNS\u89e3\u6790<\/strong>\uff1a\u57fa\u4e8e\u5730\u7406\u3001\u7f51\u7edc\u62d3\u6251\u4e0e\u5b9e\u65f6\u8d1f\u8f7d\u9009\u62e9\u6700\u4f18\u8282\u70b9\u3002<\/li>\n<li><strong>QUIC\/HTTP\/3<\/strong>\u4e0eTLS 1.3\uff1a\u51cf\u5c11\u63e1\u624b\u65f6\u95f4\uff0c\u652f\u63010-RTT\u6062\u590d\uff0c\u663e\u8457\u7f29\u77ed\u8fde\u63a5\u5efa\u7acb\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u7b56\u7565\u4e0e\u4e00\u81f4\u6027\u4fdd\u8bc1<\/h3>\n<p>\u8fb9\u7f18\u7f13\u5b58\u9700\u5728\u547d\u4e2d\u7387\u4e0e\u4e00\u81f4\u6027\u4e4b\u95f4\u6743\u8861\u3002\u5e38\u89c1\u6280\u672f\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5206\u5c42\u7f13\u5b58\uff08Tiered Cache\uff09\uff1a\u8fb9\u7f18\u8282\u70b9\u4ece\u4e0a\u6e38\u533a\u57df\u7f13\u5b58\u6216\u4e2d\u7ee7\u83b7\u53d6\u547d\u4e2d\uff0c\u964d\u4f4e\u56de\u6e90\u6d41\u91cf\u3002<\/li>\n<li>\u667a\u80fd\u9884\u53d6\uff08Prefetching\uff09\uff1a\u57fa\u4e8e\u70ed\u5ea6\u9884\u6d4b\u4e0e\u8def\u5f84\u5206\u6790\u63d0\u524d\u52a0\u8f7d\u8d44\u6e90\u3002<\/li>\n<li>\u7f13\u5b58\u66ff\u6362\u7b97\u6cd5\uff1a<strong>LRU\u3001LFU\u3001ARC<\/strong> \u7b49\u7528\u4e8e\u4e0d\u540c\u573a\u666f\uff1b\u70ed\u5185\u5bb9\u6d41\u91cf\u7a81\u589e\u65f6\u7ed3\u5408\u901f\u7387\u9650\u5236\uff08rate limiting\uff09\u4e0e\u7194\u65ad\u673a\u5236\u3002<\/li>\n<li>\u5f31\u4e00\u81f4\u6027\u6a21\u578b\uff1a\u901a\u8fc7TTL\u3001\u7248\u672c\u53f7\u3001\u57fa\u4e8e\u4e8b\u4ef6\u7684\u5931\u6548\uff08purge\uff09\u6216\u589e\u91cf\u66f4\u65b0\u6765\u4fdd\u6301\u6700\u7ec8\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h3>\u8fb9\u7f18\u8ba1\u7b97\u4e0eServerless\/WASM<\/h3>\n<p>\u73b0\u4ee3\u8fb9\u7f18\u5e73\u53f0\u652f\u6301\u8f7b\u91cf\u7ea7\u7684\u65e0\u670d\u52a1\u5668\u51fd\u6570\uff08Edge Functions\uff09\u548cWebAssembly\uff08WASM\uff09\u8fd0\u884c\u73af\u5883\uff1a<\/p>\n<ul>\n<li>Edge Functions\uff1a\u7528\u4e8e\u8bf7\u6c42\u5904\u7406\u3001A\/B\u6d4b\u8bd5\u3001\u5185\u5bb9\u91cd\u5199\u3001\u8ba4\u8bc1\u6388\u6743\u7b49\uff0c\u901a\u5e38\u4ee5\u6beb\u79d2\u7ea7\u54cd\u5e94\u5b8c\u6210\u3002<\/li>\n<li>WASM\uff1a\u63d0\u4f9b\u6c99\u7bb1\u5316\u7684\u9ad8\u6027\u80fd\u4e8c\u8fdb\u5236\u6267\u884c\uff0c\u9002\u5408\u8fd0\u884c\u56fe\u50cf\u5904\u7406\u3001\u52a0\u5bc6\/\u89e3\u5bc6\u548cAI\u63a8\u7406\u8f7b\u91cf\u6a21\u578b\u3002<\/li>\n<\/ul>\n<h3>\u786c\u4ef6\u52a0\u901f\u4e0e\u7f51\u7edc\u529f\u80fd\u865a\u62df\u5316\uff08NFV\uff09<\/h3>\n<p>\u4e3a\u4e86\u652f\u6301\u9ad8\u5e76\u53d1\u3001\u4f4e\u5ef6\u8fdf\uff0c\u8fb9\u7f18\u8282\u70b9\u5e38\u5f15\u5165\u786c\u4ef6\u52a0\u901f\uff1a<\/p>\n<ul>\n<li>SmartNIC\uff08\u5982DPDK\u3001SR-IOV\uff09\uff1a\u5378\u8f7d\u6570\u636e\u5305\u5904\u7406\uff0c\u964d\u4f4eCPU\u5f00\u9500\u3002<\/li>\n<li>GPU\/TPU\u52a0\u901f\uff1a\u7528\u4e8e\u8fb9\u7f18AI\u63a8\u7406\uff08\u4f8b\u5982\u89c6\u9891\u5e27\u5206\u6790\u3001\u4eba\u8138\u8bc6\u522b\uff09\u3002<\/li>\n<li>NFV\uff1a\u5c06\u7f51\u7edc\u529f\u80fd\uff08\u9632\u706b\u5899\u3001\u8d1f\u8f7d\u5747\u8861\uff09\u8f6f\u5316\u4e3a\u53ef\u7f16\u6392\u670d\u52a1\uff0c\u63d0\u9ad8\u90e8\u7f72\u7075\u6d3b\u6027\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\u8be6\u89e3<\/h2>\n<h3>\u4f4e\u5ef6\u8fdf\u5b9e\u65f6\u4ea4\u4e92\uff08\u5728\u7ebf\u6e38\u620f\u3001AR\/VR\uff09<\/h3>\n<p>\u5728\u7ebf\u6e38\u620f\u4e0e\u6c89\u6d78\u5f0f\u5e94\u7528\u5bf9\u5ef6\u8fdf\u6781\u5ea6\u654f\u611f\u3002\u901a\u8fc7\u8fb9\u7f18\u8282\u70b9\u90e8\u7f72\u6e38\u620f\u903b\u8f91\u3001\u7269\u7406\u4eff\u771f\u6216\u72b6\u6001\u540c\u6b65\uff0c\u53ef\u4ee5\u5c06\u5173\u952e\u4ea4\u4e92\u5728\u7f51\u7edc\u62d3\u6251\u7684\u6700\u77ed\u8def\u5f84\u4e0a\u5904\u7406\uff0c\u4ece\u800c\u5b9e\u73b0\u6beb\u79d2\u7ea7\u54cd\u5e94\u3002<\/p>\n<h3>\u89c6\u9891\u5206\u53d1\u4e0e\u76f4\u64ad<\/h3>\n<p>\u76f4\u64ad\u573a\u666f\u5bf9\u5e26\u5bbd\u4e0e\u5e76\u53d1\u8981\u6c42\u9ad8\uff0c\u8fb9\u7f18CDN\u901a\u8fc7\u5206\u6bb5\u7f13\u5b58\u3001\u57fa\u4e8e\u5185\u5bb9\u7684\u8def\u7531\u3001\u5e76\u884c\u5206\u53d1\u6765\u4fdd\u8bc1\u5e73\u7a33\u64ad\u653e\u4f53\u9a8c\u3002\u6b64\u5916\uff0c\u8fb9\u7f18\u53ef\u5b8c\u6210\u5b9e\u65f6\u8f6c\u7801\u3001\u6253\u6c34\u5370\u3001\u5e7f\u544a\u63d2\u5165\u7b49\u5904\u7406\uff0c\u51cf\u5c11\u56de\u6e90\u538b\u529b\u3002<\/p>\n<h3>\u7269\u8054\u7f51\uff08IoT\uff09\u4e0e\u8fb9\u7f18\u5206\u6790<\/h3>\n<p>IoT\u8bbe\u5907\u4ea7\u751f\u5927\u91cf\u65f6\u5e8f\u6570\u636e\u3002\u8fb9\u7f18\u8282\u70b9\u53ef\u8fdb\u884c\u521d\u6b65\u8fc7\u6ee4\u3001\u805a\u5408\u4e0e\u6a21\u578b\u63a8\u7406\uff0c\u53ea\u628a\u5fc5\u8981\u6570\u636e\u56de\u4f20\u4e91\u7aef\uff0c\u964d\u4f4e\u4e0a\u884c\u5e26\u5bbd\u5e76\u63d0\u5347\u54cd\u5e94\u80fd\u529b\u3002<\/p>\n<h3>\u4e2a\u6027\u5316\u7535\u5546\u4e0e\u5185\u5bb9\u63a8\u8350<\/h3>\n<p>\u5728\u7535\u5546\u4e0e\u5185\u5bb9\u63a8\u8350\u573a\u666f\uff0c\u8fb9\u7f18\u53ef\u5b58\u50a8\u7528\u6237\u4f1a\u8bdd\u3001\u5c40\u90e8\u6a21\u578b\u5e76\u8fdb\u884c\u5b9e\u65f6\u4e2a\u6027\u5316\u6e32\u67d3\uff0c\u4f7f\u9875\u9762\u54cd\u5e94\u66f4\u5feb\u4e14\u4f53\u9a8c\u66f4\u8d34\u5408\u7528\u6237\u504f\u597d\u3002<\/p>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1a\u8fb9\u7f18CDN vs \u4f20\u7edf\u96c6\u4e2d\u5f0fCDN\u4e0e\u4e91\u4e2d\u5fc3\u5316<\/h2>\n<p>\u4e0b\u9762\u5217\u51fa\u5173\u952e\u5bf9\u6bd4\u7ef4\u5ea6\uff1a<\/p>\n<ul>\n<li><strong>\u5ef6\u8fdf<\/strong>\uff1a\u8fb9\u7f18CDN\u80fd\u628a\u5904\u7406\u9760\u8fd1\u7528\u6237\uff0c\u663e\u8457\u964d\u4f4e\u9996\u5305\u65f6\u5ef6\u4e0e\u6296\u52a8\uff1b\u9002\u5408\u5b9e\u65f6\u5e94\u7528\u3002<\/li>\n<li><strong>\u5e26\u5bbd\u6548\u7387<\/strong>\uff1a\u901a\u8fc7\u5c40\u90e8\u7f13\u5b58\u3001\u9884\u5904\u7406\u4e0e\u6d41\u91cf\u672c\u5730\u5316\uff0c\u56de\u6e90\u8d1f\u8f7d\u5927\u5e45\u4e0b\u964d\uff0c\u8282\u7701\u5e26\u5bbd\u6210\u672c\u3002<\/li>\n<li><strong>\u53ef\u6269\u5c55\u6027<\/strong>\uff1a\u8fb9\u7f18\u8282\u70b9\u53ef\u4ee5\u6a2a\u5411\u6269\u5c55\u5e76\u5206\u6563\u6d41\u91cf\u538b\u529b\uff0c\u4f46\u63a7\u5236\u9762\u590d\u6742\u5ea6\u8f83\u9ad8\uff0c\u9700\u6210\u719f\u7684\u7f16\u6392\u4e0e\u76d1\u63a7\u3002<\/li>\n<li><strong>\u4e00\u81f4\u6027\u4e0e\u590d\u6742\u6027<\/strong>\uff1a\u8fb9\u7f18\u5e26\u6765\u4e86\u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u6311\u6218\uff0c\u5c24\u5176\u662f\u52a8\u6001\u6570\u636e\u5199\u5165\u573a\u666f\uff0c\u9700\u8981\u8bbe\u8ba1\u5408\u9002\u7684\u6700\u7ec8\u4e00\u81f4\u6027\u6216\u51b2\u7a81\u89e3\u51b3\u673a\u5236\u3002<\/li>\n<li><strong>\u5b89\u5168\u6027<\/strong>\uff1a\u8fb9\u7f18\u53ef\u5b9e\u73b0\u672c\u5730\u6d41\u91cf\u8fc7\u6ee4\u4e0eDDoS\u7f13\u89e3\uff0c\u4f46\u8fb9\u7f18\u9762\u7684\u653b\u51fb\u9762\u66f4\u5e7f\uff0c\u9700\u7edf\u4e00\u5b89\u5168\u7b56\u7565\u4e0e\u5bc6\u94a5\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<h2>\u90e8\u7f72\u4e0e\u9009\u8d2d\u5efa\u8bae\uff08\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u4e0e\u5f00\u53d1\u8005\uff09<\/h2>\n<h3>\u5730\u57df\u4e0e\u8282\u70b9\u5206\u5e03<\/h3>\n<p>\u9009\u62e9CDN\/\u8fb9\u7f18\u670d\u52a1\u65f6\uff0c\u5e94\u4f18\u5148\u8003\u8651\u4e1a\u52a1\u7528\u6237\u5206\u5e03\u3002\u4f8b\u5982\uff0c\u9762\u5411\u9999\u6e2f\u4e0e\u4e9a\u6d32\u5e02\u573a\u7684\u670d\u52a1\u9700\u8981\u5728\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u6709\u4e30\u5bccPOP\uff1b\u800c\u8986\u76d6\u5317\u7f8e\u7528\u6237\u5219\u8981\u5173\u6ce8\u7f8e\u56fd\u670d\u52a1\u5668\u4e0e\u7f8e\u56fdVPS\u8282\u70b9\u3002\u4e0d\u540c\u5730\u533a\u7684\u8282\u70b9\u5bc6\u5ea6\u76f4\u63a5\u5f71\u54cd\u5ef6\u8fdf\u4e0e\u547d\u4e2d\u7387\u3002<\/p>\n<h3>\u4e92\u8054\u4e0e\u5bf9\u7b49\uff08Peering\uff09\u80fd\u529b<\/h3>\n<p>\u826f\u597d\u7684\u9aa8\u5e72\u4e92\u8054\u4e0e\u672c\u5730ISP\u5bf9\u7b49\u5173\u7cfb\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u8de8\u5883\u8df3\u6570\u4e0e\u8f6c\u53d1\u5ef6\u8fdf\u3002\u8bc4\u4f30\u670d\u52a1\u5546\u5728\u672c\u5730\u5173\u952eIX\uff08Internet Exchange\uff09\u548c\u4e3b\u6d41\u8fd0\u8425\u5546\u7684\u76f4\u8fde\u60c5\u51b5\u3002<\/p>\n<h3>\u534f\u8bae\u4e0e\u529f\u80fd\u652f\u6301<\/h3>\n<p>\u67e5\u770b\u662f\u5426\u652f\u6301HTTP\/2\u3001HTTP\/3\uff08QUIC\uff09\u3001TLS 1.3\u3001WebSocket\u4e0eEdge Functions\uff08WASM\/Serverless\uff09\u3002\u5bf9\u89c6\u9891\u548c\u6e38\u620f\u4e1a\u52a1\uff0c\u6ce8\u610f\u662f\u5426\u652f\u6301\u5b9e\u65f6\u8f6c\u7801\u3001\u4f4e\u5ef6\u8fdfHLS\/LL-HLS\u3001RTP\/RTSP\u8f6c\u53d1\u7b49\u3002<\/p>\n<h3>\u8fd0\u7ef4\u4e0e\u53ef\u89c2\u6d4b\u6027<\/h3>\n<p>\u8fb9\u7f18\u67b6\u6784\u8fd0\u7ef4\u590d\u6742\uff0c\u52a1\u5fc5\u8bc4\u4f30\u5e73\u53f0\u63d0\u4f9b\u7684\u76d1\u63a7\u3001\u65e5\u5fd7\u805a\u5408\u3001\u8ffd\u8e2a\uff08OpenTelemetry \u652f\u6301\uff09\u4e0e\u544a\u8b66\u80fd\u529b\u3002SLA\u3001\u6545\u969c\u8fc1\u79fb\u4e0e\u56de\u6e90\u7b56\u7565\u4e5f\u5e94\u5728\u5408\u540c\u4e2d\u660e\u786e\u3002<\/p>\n<h3>\u5b89\u5168\u4e0e\u5408\u89c4<\/h3>\n<p>\u8fb9\u7f18\u90e8\u7f72\u6d89\u53ca\u5730\u7406\u5206\u6563\u7684\u6570\u636e\u5904\u7406\uff0c\u5e94\u5173\u6ce8\u6570\u636e\u4e3b\u6743\u4e0e\u5408\u89c4\u6027\uff08\u5982GDPR\uff09\u3002\u540c\u65f6\uff0c\u6838\u67e5DDoS\u9632\u62a4\u3001WAF\u3001\u8bc1\u4e66\u7ba1\u7406\u4e0e\u5bc6\u94a5\u6258\u7ba1\u65b9\u6848\u3002<\/p>\n<h3>\u6df7\u5408\u90e8\u7f72\u4e0e\u56de\u6e90\u7b56\u7565<\/h3>\n<p>\u5f88\u591a\u4f01\u4e1a\u91c7\u7528\u6df7\u5408\u4e91\u7b56\u7565\uff1a\u6838\u5fc3\u4e1a\u52a1\u90e8\u7f72\u5728\u4e91\u6216\u81ea\u6709\u6570\u636e\u4e2d\u5fc3\uff0c\u9759\u6001\u4e0e\u5ef6\u8fdf\u654f\u611f\u670d\u52a1\u90e8\u7f72\u5728\u8fb9\u7f18\u3002\u8bc4\u4f30\u56de\u6e90\u7b56\u7565\u3001\u7f13\u5b58\u5931\u6548\u673a\u5236\uff08Purge\/Invalidate\uff09\u4e0e\u4e00\u81f4\u6027\u6a21\u578b\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h2>\u5b9e\u8df5\u5efa\u8bae\u4e0e\u6027\u80fd\u8c03\u4f18\u8981\u70b9<\/h2>\n<ul>\n<li>\u5408\u7406\u8bbe\u7f6eCache-Control\u3001ETag\u4e0eTTL\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u56de\u6e90\u8bf7\u6c42\u3002<\/li>\n<li>\u4f7f\u7528\u5206\u6bb5\u4f20\u8f93\uff08range 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