{"id":210377,"date":"2025-10-24T11:56:42","date_gmt":"2025-10-24T03:56:42","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210377\/"},"modified":"2025-10-24T11:56:43","modified_gmt":"2025-10-24T03:56:43","slug":"cdn-385","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210377\/","title":{"rendered":"CDN\u8de8\u5883\u52a0\u901f\u667a\u80fd\u5316\u5b9e\u6218\uff1a\u7b56\u7565\u3001\u67b6\u6784\u4e0e\u843d\u5730\u7ecf\u9a8c"},"content":{"rendered":"<p>\u968f\u7740\u8de8\u5883\u4e1a\u52a1\u548c\u5168\u7403\u7528\u6237\u5206\u5e03\u7684\u589e\u957f\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u5df2\u7ecf\u4ece\u7b80\u5355\u7684\u9759\u6001\u52a0\u901f\u6f14\u8fdb\u4e3a\u652f\u6301\u590d\u6742\u5e94\u7528\u7684\u667a\u80fd\u5316\u5e73\u53f0\u3002\u672c\u6587\u9488\u5bf9\u7ad9\u957f\u3001\u4f01\u4e1a\u548c\u5f00\u53d1\u8005\uff0c\u6df1\u5165\u5256\u6790\u8de8\u5883\u52a0\u901f\u7684\u539f\u7406\u3001\u5178\u578b\u5e94\u7528\u573a\u666f\u4e0e\u843d\u5730\u7b56\u7565\uff0c\u7ed3\u5408\u591a\u5730\u533a\u7f51\u7edc\u7279\u6027\uff08\u5982\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u3001\u7f8e\u56fd\uff09\u7ed9\u51fa\u5207\u5b9e\u53ef\u884c\u7684\u67b6\u6784\u4e0e\u9009\u8d2d\u5efa\u8bae\uff0c\u5e2e\u52a9\u4f60\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5b9e\u73b0\u9ad8\u53ef\u7528\u3001\u4f4e\u5ef6\u8fdf\u548c\u6210\u672c\u53ef\u63a7\u7684\u5168\u7403\u52a0\u901f\u3002<\/p>\n<h2>\u8de8\u5883CDN\u52a0\u901f\u7684\u6838\u5fc3\u539f\u7406<\/h2>\n<p>\u8981\u5b9e\u73b0\u8de8\u5883\u52a0\u901f\uff0c\u9700\u7406\u89e3\u4ee5\u4e0b\u5173\u952e\u6280\u672f\u70b9\uff1a<\/p>\n<ul>\n<li><strong>Anycast \u4e0e BGP \u8def\u7531\u4f18\u5316<\/strong>\uff1aCDN \u8fb9\u7f18\u8282\u70b9\u901a\u5e38\u4f7f\u7528 Anycast \u5730\u5740\u53d1\u5e03\u540c\u4e00 IP\uff0c\u901a\u8fc7 BGP \u5c06\u7528\u6237\u6d41\u91cf\u5f15\u5bfc\u5230\u6700\u8fd1\u6216\u6700\u4f18\u7684 PoP\uff08Point of Presence\uff09\u3002\u5728\u8de8\u5883\u573a\u666f\uff0c\u5408\u7406\u7684 BGP \u7b56\u7565\u548c\u4e0e\u5f53\u5730 ISP \u7684\u4e92\u8054\u5bf9\u5ef6\u8fdf\u4e0e\u7a33\u5b9a\u6027\u81f3\u5173\u91cd\u8981\u3002<\/li>\n<li><strong>DNS \u5c42\u7684\u667a\u80fd\u8c03\u5ea6<\/strong>\uff1a\u901a\u8fc7\u5730\u7406\u4f4d\u7f6e\u3001\u7f51\u7edc\u6d4b\u91cf\uff08latency\u3001packet loss\uff09\u3001\u8d1f\u8f7d\u4e0e\u6545\u969c\u68c0\u6d4b\u7b49\u7ef4\u5ea6\u5728 DNS \u5c42\u4f5c\u667a\u80fd\u89e3\u6790\uff08\u6216\u7ed3\u5408 HTTP \u91cd\u5b9a\u5411\uff09\uff0c\u5b9e\u73b0\u6d41\u91cf\u5c31\u8fd1\u6216\u5c31\u4f18\u5206\u53d1\u3002<\/li>\n<li><strong>\u534f\u8bae\u6808\u4f18\u5316<\/strong>\uff1a\u542f\u7528 HTTP\/2\u3001HTTP\/3\uff08QUIC\uff09\u3001TLS 0-RTT\u3001TCP Fast Open \u7b49\u53ef\u4ee5\u663e\u8457\u6539\u5584\u8de8\u56fd\u8fde\u63a5\u7684\u9996\u5305\u65f6\u5ef6\u4e0e\u4e22\u5305\u6062\u590d\u901f\u5ea6\u3002<\/li>\n<li><strong>\u7f13\u5b58\u7b56\u7565\u4e0e\u7f13\u5b58\u4e00\u81f4\u6027<\/strong>\uff1a\u901a\u8fc7\u5408\u7406\u7684 Cache-Control\u3001Expires\u3001ETag\u3001Last-Modified \u4e0e Cache Key \u7b56\u7565\uff0c\u7ed3\u5408 <strong>stale-while-revalidate<\/strong>\u3001origin shield\uff08\u6e90\u7ad9\u4fdd\u62a4\uff09\u548c\u5206\u7ea7\u7f13\u5b58\uff0c\u51cf\u5c11\u56de\u6e90\u538b\u529b\u5e76\u63d0\u5347\u547d\u4e2d\u7387\u3002<\/li>\n<li><strong>\u5b89\u5168\u4e0e\u53ef\u9760\u6027<\/strong>\uff1a\u8de8\u5883\u4e1a\u52a1\u9762\u4e34\u66f4\u591a\u653b\u51fb\u9762\uff0c\u9700\u5728 CDN \u5c42\u96c6\u6210 WAF\u3001DDoS \u9632\u62a4\u3001\u901f\u7387\u9650\u5236\u4e0e IP\/ASN \u9ed1\u767d\u540d\u5355\u3002<\/li>\n<\/ul>\n<h3>\u8fb9\u7f18\u8ba1\u7b97\u4e0e\u8fb9\u7f18\u7f13\u5b58\u7ec6\u8282<\/h3>\n<p>\u73b0\u4ee3 CDN \u652f\u6301\u8fb9\u7f18\u51fd\u6570\uff08Edge Compute\uff09\u4e0e\u81ea\u5b9a\u4e49\u7f13\u5b58\u903b\u8f91\uff1a\u5728\u8fb9\u7f18\u8fdb\u884c HTML \u7247\u6bb5\u62fc\u63a5\u3001API \u54cd\u5e94\u7f13\u5b58\u3001A\/B \u6d4b\u8bd5\u8def\u7531\u6216\u7528\u6237\u7279\u5f81\u5224\u65ad\u7b49\uff0c\u80fd\u5c06\u66f4\u591a\u903b\u8f91\u4e0b\u6c89\u5230\u79bb\u7528\u6237\u66f4\u8fd1\u7684\u4f4d\u7f6e\uff0c\u4ece\u800c\u6781\u5927\u964d\u4f4e\u8de8\u5883\u56de\u6e90\u8bf7\u6c42\u3002\u5b9e\u73b0\u8981\u70b9\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5728\u8fb9\u7f18\u6267\u884c\u8f7b\u91cf\u5316\u903b\u8f91\uff0c\u907f\u514d\u957f\u65f6\u95f4\u963b\u585e\u7f51\u7edc I\/O\u3002<\/li>\n<li>\u660e\u786e\u8fb9\u7f18\u53ef\u6267\u884c\u4ee3\u7801\u7684\u5b89\u5168\u8fb9\u754c\u4e0e\u8d44\u6e90\u914d\u989d\uff0c\u9632\u6b62\u6ee5\u7528\u6216\u5f71\u54cd\u5176\u4ed6\u79df\u6237\u3002<\/li>\n<li>\u901a\u8fc7 Cache Key \u5c06\u52a8\u6001\/\u9759\u6001\u5185\u5bb9\u533a\u5206\u5f00\uff0c\u4f7f\u7528 Cookie\u3001Query String \u6216\u81ea\u5b9a\u4e49 Header \u63a7\u5236\u7f13\u5b58\u7c92\u5ea6\u3002<\/li>\n<\/ul>\n<h2>\u5178\u578b\u5e94\u7528\u573a\u666f\u4e0e\u843d\u5730\u7b56\u7565<\/h2>\n<p>\u4e0d\u540c\u4e1a\u52a1\u5bf9\u8de8\u5883 CDN \u7684\u9700\u6c42\u5dee\u5f02\u5f88\u5927\uff0c\u4e0b\u9762\u5217\u4e3e\u51e0\u7c7b\u5178\u578b\u573a\u666f\u53ca\u5b9e\u6218\u5efa\u8bae\uff1a<\/p>\n<h3>\u9759\u6001\u5185\u5bb9\u5206\u53d1\uff08\u56fe\u7247\u3001\u89c6\u9891\u3001\u9759\u6001\u7ad9\u70b9\uff09<\/h3>\n<ul>\n<li>\u4f18\u5148\u91c7\u7528\u8fb9\u7f18\u7f13\u5b58\uff08Push\/Origin Pull \u5747\u53ef\uff09\uff0c\u5bf9\u89c6\u9891\u4f7f\u7528\u5206\u6bb5\uff08HLS\/DASH\uff09+ \u591a\u7801\u7387\u81ea\u9002\u5e94\u3002<\/li>\n<li>\u5f00\u542f Brotli\/Gzip \u4e0e\u56fe\u7247 WebP\/AVIF \u8f6c\u7801\u4ee5\u51cf\u5c11\u5e26\u5bbd\u3002<\/li>\n<li>\u9488\u5bf9\u4e9a\u592a\u5730\u533a\uff08\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\uff09\u53ef\u5e03\u7f6e\u66f4\u591a PoP\uff0c\u51cf\u5c11\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09\u3002\u5bf9\u7f8e\u56fd\u7528\u6237\u5219\u4fa7\u91cd\u957f\u94fe\u8def\u7a33\u5b9a\u4e0e\u5e26\u5bbd\u6210\u672c\u3002<\/li>\n<\/ul>\n<h3>\u52a8\u6001 API \u4e0e\u7535\u5546\u5e73\u53f0<\/h3>\n<ul>\n<li>\u4f7f\u7528 Layered Caching\uff08\u8fb9\u7f18\u7f13\u5b58 + \u524d\u7f6e\u7f13\u5b58 + \u6e90\u7ad9\uff09\u5e76\u7ed3\u5408 <strong>stale-if-error<\/strong> \u6216 fallback \u7b56\u7565\uff0c\u4fdd\u8bc1\u9ad8\u53ef\u7528\u6027\u3002<\/li>\n<li>\u5bf9\u7528\u6237\u9690\u79c1\u654f\u611f\u7684 API \u8981\u6c42\u8d70\u52a0\u5bc6\u4f20\u8f93\u5e76\u8fdb\u884c\u7ec6\u7c92\u5ea6\u7684\u9274\u6743\uff08Signed URL \/ Token\uff09\u3002<\/li>\n<li>\u5bf9\u5168\u7403\u5206\u5e03\u5f3a\u70c8\u7684\u7528\u6237\u7fa4\uff0c\u53ef\u8003\u8651 Multi-Region Active-Active \u7ed3\u5408\u6570\u636e\u5e93\u590d\u5236\u4e0e\u4e00\u81f4\u6027\u7b56\u7565\uff0c\u907f\u514d\u8de8\u6d0b\u540c\u6b65\u5ef6\u8fdf\u6210\u4e3a\u74f6\u9888\u3002<\/li>\n<\/ul>\n<h3>\u5927\u6587\u4ef6\u4e0e\u8f6f\u4ef6\u5206\u53d1<\/h3>\n<ul>\n<li>\u91c7\u7528\u5206\u6bb5\u4e0b\u8f7d + \u6821\u9a8c\uff08\u5982 MD5\/SHA\uff09\u5e76\u7ed3\u5408 P2P\/CDN \u6df7\u5408\u5206\u53d1\u7b56\u7565\u964d\u4f4e\u6210\u672c\u3002<\/li>\n<li>\u5bf9\u7ecf\u5e38\u66f4\u65b0\u7684\u6587\u4ef6\u4f7f\u7528\u7248\u672c\u5316\u6587\u4ef6\u540d\uff0c\u907f\u514d\u9891\u7e41\u5931\u6548\u5bfc\u81f4\u7f13\u5b58\u51fb\u7a7f\u3002<\/li>\n<\/ul>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1a\u5355 CDN \u4e0e\u591a CDN\u3001\u4e91 CDN \u4e0e\u81ea\u5efa\u7f51\u7edc<\/h2>\n<p>\u5728\u8de8\u5883\u573a\u666f\u4e0b\u5e38\u89c1\u7684\u9009\u62e9\u6709\uff1a\u5355\u4e00\u5546\u4e1a CDN\u3001\u591a CDN \u8c03\u5ea6\u3001\u6216\u81ea\u5efa\u9aa8\u5e72+\u5408\u4f5c PoP\u3002\u5404\u6709\u5229\u5f0a\uff1a<\/p>\n<ul>\n<li><strong>\u5355 CDN<\/strong>\uff1a\u8fd0\u7ef4\u7b80\u5355\uff0c\u8ba1\u8d39\u53ef\u9884\u6d4b\uff0c\u4f46\u67d0\u4e00\u5730\u57df\u7684\u4e22\u5305\/\u65ad\u94fe\u4f1a\u5f71\u54cd\u5168\u90e8\u7528\u6237\u3002<\/li>\n<li><strong>\u591a CDN\uff08Multi-CDN\uff09<\/strong>\uff1a\u901a\u8fc7\u667a\u80fd\u8c03\u5ea6\u4e0e\u76d1\u63a7\u5728\u4e0d\u540c\u8fd0\u8425\u5546\u4e4b\u95f4\u5207\u6362\uff0c\u53ef\u83b7\u5f97\u66f4\u9ad8\u53ef\u7528\u6027\u548c\u66f4\u4f18\u5ef6\u8fdf\uff0c\u4f46\u6210\u672c\u4e0e\u914d\u7f6e\u590d\u6742\u5ea6\u63d0\u9ad8\uff0c\u9700\u8981\u5b9e\u73b0\u6d41\u91cf\u5207\u6362\u4e0e\u65e5\u5fd7\u6574\u5408\u3002<\/li>\n<li><strong>\u81ea\u5efa\u7f51\u7edc\uff08\u6216\u6df7\u5408\u65b9\u6848\uff09<\/strong>\uff1a\u5bf9\u6d41\u91cf\u5927\u6237\u6216\u5bf9\u7f51\u7edc\u8d28\u91cf\u6709\u6781\u9ad8\u8981\u6c42\u7684\u4f01\u4e1a\u53ef\u5728\u91cd\u70b9\u57ce\u5e02\uff08\u5982\u9999\u6e2f\uff09\u90e8\u7f72\u81ea\u6709\u8fb9\u7f18\u3001\u5e76\u4e0e\u672c\u5730 ISP \u505a\u70b9\u5bf9\u70b9\u4e92\u8054\uff0c\u83b7\u5f97\u6700\u4f18\u4f53\u9a8c\u3002\u4f46\u521d\u59cb\u6295\u5165\u4e0e\u7ef4\u62a4\u95e8\u69db\u9ad8\u3002<\/li>\n<\/ul>\n<h3>\u5728\u9999\u6e2f\u4e0e\u5468\u8fb9\u5730\u533a\u7684\u7279\u6b8a\u8003\u8651<\/h3>\n<p>\u9999\u6e2f\u4f5c\u4e3a\u4e9a\u592a\u67a2\u7ebd\uff0c\u8fde\u63a5\u4e2d\u56fd\u5185\u5730\u3001\u4e1c\u5357\u4e9a\u4e0e\u6b27\u7f8e\u7684\u7f51\u7edc\u4e2d\u7ee7\u70b9\uff0c\u5176\u7279\u70b9\u662f\u94fe\u8def\u5ef6\u8fdf\u4f4e\u3001\u53ef\u7528\u5e26\u5bbd\u5927\u3002\u4f46\u9700\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728\u9999\u6e2f PoP \u4e0a\u4e0e\u4e2d\u56fd\u5185\u5730\u7684\u4e92\u8054\u5f80\u5f80\u53d7\u653f\u7b56\u4e0e\u8fd0\u8425\u5546\u9650\u5236\uff0c\u82e5\u76ee\u6807\u7528\u6237\u5305\u542b\u4e2d\u56fd\u5927\u9646\uff0c\u4ecd\u9700\u8003\u8651\u5907\u6848\u3001\u76f4\u8fde\u4e0e\u4e13\u7ebf\u7b49\u65b9\u6848\u3002<\/li>\n<li>\u5bf9\u4e8e\u9762\u5411\u4e1c\u4e9a\u56fd\u5bb6\uff08\u65e5\u672c\u3001\u97e9\u56fd\uff09\u548c\u4e1c\u5357\u4e9a\uff08\u65b0\u52a0\u5761\uff09\u7684\u7528\u6237\uff0c\u9999\u6e2f\u8282\u70b9\u901a\u5e38\u8868\u73b0\u4f18\u79c0\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u4f18\u5148\u8282\u70b9\u90e8\u7f72\u3002<\/li>\n<\/ul>\n<h2>\u843d\u5730\u67b6\u6784\u8bbe\u8ba1\u4e0e\u5b9e\u65bd\u7ec6\u8282<\/h2>\n<p>\u4e0b\u9762\u7ed9\u51fa\u4e00\u4e2a\u53ef\u590d\u7528\u7684\u8de8\u5883 CDN + \u8fb9\u7f18\u8ba1\u7b97\u53c2\u8003\u67b6\u6784\uff1a<\/p>\n<ul>\n<li>\u8fb9\u7f18\u5c42\uff08\u5168\u7403 PoP\uff0c\u91c7\u7528 Anycast\uff09\u8d1f\u8d23 TLS \u7ec8\u6b62\u3001\u9759\u6001\u7f13\u5b58\u3001\u8fb9\u7f18\u51fd\u6570\u4e0e WAF\u3002<\/li>\n<li>\u8c03\u5ea6\u5c42\uff08\u667a\u80fd DNS + \u5065\u5eb7\u68c0\u6d4b\uff09\u8d1f\u8d23\u6839\u636e\u5730\u7406\u3001\u7f51\u7edc\u8d28\u91cf\u4e0e\u6d41\u91cf\u7b56\u7565\u5206\u914d CDN \u6216\u591a CDN\u3002<\/li>\n<li>\u524d\u7f6e\u7f13\u5b58\/Origin Shield\uff08\u533a\u57df\u4e2d\u5fc3 PoP\uff09\u7528\u4e8e\u5438\u6536\u56de\u6e90\u9ad8\u5cf0\uff0c\u4fdd\u62a4\u6e90\u7ad9\u3002<\/li>\n<li>\u6e90\u7ad9\u5c42\u90e8\u7f72\u5728\u591a\u5730\u57df\uff08\u4f8b\u5982\u9999\u6e2f\u670d\u52a1\u5668 \/ \u7f8e\u56fd\u670d\u52a1\u5668 \/ \u65b0\u52a0\u5761\u670d\u52a1\u5668\uff09\u5b9e\u73b0\u5c31\u8fd1\u56de\u6e90\u4e0e\u5bb9\u707e\uff1b\u6570\u636e\u5e93\u91c7\u7528\u53ea\u8bfb\u526f\u672c\u6216\u5206\u533a\u5316\u7b56\u7565\u3002<\/li>\n<li>\u76d1\u63a7\u4e0e\u65e5\u5fd7\uff1a\u7edf\u4e00\u91c7\u96c6\u8fb9\u7f18\u8bbf\u95ee\u65e5\u5fd7\u3001\u6027\u80fd\u6307\u6807\uff08RTT\u3001TTFB\u3001\u7f13\u5b58\u547d\u4e2d\u7387\uff09\u3001\u5b89\u5168\u4e8b\u4ef6\u5e76\u901a\u8fc7 Grafana\/ELK \u6216\u4e13\u6709\u5e73\u53f0\u505a\u5b9e\u65f6\u544a\u8b66\u4e0e\u8def\u7531\u8c03\u6574\u3002<\/li>\n<\/ul>\n<h3>\u914d\u7f6e\u793a\u4f8b\u4e0e\u8c03\u4f18\u8981\u70b9<\/h3>\n<ul>\n<li>Cache-Control\uff1a\u5bf9\u9759\u6001\u8d44\u6e90\u4f7f\u7528 long max-age\uff08\u4f8b\u5982 30 \u5929\uff09\uff0c\u914d\u5408\u6587\u4ef6\u540d\u7248\u672c\u5316\uff1b\u5bf9 HTML \u4f7f\u7528\u77ed cache \u6216 no-cache\uff0c\u7ed3\u5408 Edge-side 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