{"id":210057,"date":"2025-10-24T04:42:13","date_gmt":"2025-10-23T20:42:13","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210057\/"},"modified":"2025-10-24T04:42:14","modified_gmt":"2025-10-23T20:42:14","slug":"cdn-262","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210057\/","title":{"rendered":"CDN\u8282\u70b9\u8d1f\u8f7d\u5747\u8861\u5b9e\u6218\uff1a\u964d\u4f4e\u5ef6\u8fdf\u3001\u63d0\u5347\u7a33\u5b9a\u6027\u7684\u5173\u952e\u4f18\u5316\u6280\u5de7"},"content":{"rendered":"<p>\u968f\u7740\u5168\u7403\u7528\u6237\u5bf9\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u53ef\u7528\u6027 Web \u670d\u52a1\u7684\u671f\u671b\u4e0d\u65ad\u63d0\u9ad8\uff0c\u4f20\u7edf\u7684\u5355\u70b9\u670d\u52a1\u67b6\u6784\u5df2\u96be\u4ee5\u6ee1\u8db3\u5206\u5e03\u5f0f\u6d41\u91cf\u5cf0\u503c\u4e0e\u7a81\u53d1\u6545\u969c\u7684\u6311\u6218\u3002\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff08CDN\uff09\u901a\u8fc7\u5728\u591a\u4e2a\u5730\u7406\u4f4d\u7f6e\u90e8\u7f72\u8282\u70b9\u6765\u52a0\u901f\u9759\u6001\u4e0e\u52a8\u6001\u5185\u5bb9\u7684\u5206\u53d1\uff0c\u4f46\u4ec5\u6709\u8282\u70b9\u5e76\u4e0d\u8db3\u4ee5\u4fdd\u8bc1\u4f18\u5f02\u4f53\u9a8c\u3002<strong>\u5408\u7406\u7684\u8282\u70b9\u8d1f\u8f7d\u5747\u8861\u7b56\u7565<\/strong>\u662f\u964d\u4f4e\u5ef6\u8fdf\u3001\u63d0\u5347\u7a33\u5b9a\u6027\u7684\u5173\u952e\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\uff0c\u7ed3\u5408\u539f\u7406\u4e0e\u5b9e\u6218\u6280\u5de7\uff0c\u8be6\u8ff0\u5982\u4f55\u5728\u591a\u533a\u57df\uff08\u5982\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u3001\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u3001\u65b0\u52a0\u5761\u670d\u52a1\u5668\u7b49\uff09\u90e8\u7f72\u4e0e\u4f18\u5316 CDN \u8282\u70b9\u8d1f\u8f7d\u5747\u8861\uff0c\u4ee5\u83b7\u5f97\u53ef\u89c2\u7684\u6027\u80fd\u4e0e\u53ef\u7528\u6027\u63d0\u5347\u3002<\/p>\n<h2>\u6838\u5fc3\u539f\u7406\u6982\u8ff0<\/h2>\n<p>CDN \u8282\u70b9\u8d1f\u8f7d\u5747\u8861\u6d89\u53ca\u6d41\u91cf\u7684\u667a\u80fd\u5206\u914d\u3001\u6545\u969c\u68c0\u6d4b\u4e0e\u8def\u7531\u4f18\u5316\uff0c\u5e38\u89c1\u673a\u5236\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>DNS \u8d1f\u8f7d\u5747\u8861\u4e0e\u8def\u7531\u7b56\u7565<\/strong>\uff1a\u901a\u8fc7\u6743\u91cd\u6216\u5730\u7406\u4f4d\u7f6e\u8fd4\u56de\u4e0d\u540c\u8282\u70b9 IP\u3002\u914d\u5408 EDNS-Client-Subnet\uff08ECS\uff09\u53ef\u4ee5\u63d0\u5347\u5ba2\u6237\u7aef IP \u7684\u8def\u7531\u51c6\u786e\u5ea6\uff0c\u4f46\u9700\u6743\u8861\u9690\u79c1\u548c\u517c\u5bb9\u6027\u3002<\/li>\n<li><strong>Anycast \u4e0e BGP \u8def\u7531<\/strong>\uff1a\u5728\u591a\u4e2a PoP \u4f7f\u7528\u76f8\u540c\u4efb\u610f\u64ad IP\uff0c\u901a\u8fc7 BGP \u5c06\u7528\u6237\u8def\u7531\u5230\u6700\u8fd1\u6216\u8def\u7531\u6700\u4f18\u7684\u8282\u70b9\u3002Anycast \u5bf9\u53cc\u5411\u8fde\u63a5\uff08\u5982 TLS\u3001QUIC\uff09\u8868\u73b0\u4f18\u79c0\uff0c\u4f46\u5bf9\u4f1a\u8bdd\u9ecf\u5ea6\u3001\u56de\u6e90\u8def\u7531\u6709\u7279\u6b8a\u8981\u6c42\u3002<\/li>\n<li><strong>\u4e3b\u52a8\u63a2\u6d4b\u4e0e\u88ab\u52a8\u76d1\u6d4b\u76f8\u7ed3\u5408<\/strong>\uff1a\u7528 RTT\/HTTP \u54cd\u5e94\u65f6\u95f4\u3001\u9519\u8bef\u7387\u505a\u5b9e\u65f6\u6253\u5206\uff0c\u7ed3\u5408\u88ab\u52a8\u65e5\u5fd7\uff08RPS\u30014xx\/5xx\u3001\u5e26\u5bbd\uff09\u505a\u8282\u70b9\u5065\u5eb7\u8bc4\u4f30\u3002<\/li>\n<li><strong>\u5e94\u7528\u5c42\u8d1f\u8f7d\u5747\u8861<\/strong>\uff1a\u5728\u8fb9\u7f18\u8282\u70b9\u5185\u90e8\uff0c\u4f7f\u7528\u53cd\u5411\u4ee3\u7406\uff08Nginx\/HAProxy\/Envoy\uff09\u6216\u7f13\u5b58\uff08Varnish\u3001Fastly\uff09\u505a\u672c\u5730\u5747\u8861\u548c\u9996\u9009\u5b9e\u4f8b\u9009\u62e9\u3002<\/li>\n<\/ul>\n<h2>\u5b9e\u6218\u5e94\u7528\u573a\u666f\u4e0e\u7b56\u7565<\/h2>\n<h3>1. \u5168\u7403\u7528\u6237\u5206\u5e03\uff0c\u964d\u4f4e\u9996\u6b21\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09<\/h3>\n<p>\u5bf9\u4e8e\u5168\u7403\u8bbf\u95ee\u7684\u7ad9\u70b9\uff0c\u5e94\u5728\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u65b0\u52a0\u5761\u3001\u97e9\u56fd\u3001\u7f8e\u56fd\u7b49\u533a\u57df\u90e8\u7f72\u8282\u70b9\u3002\u63a8\u8350\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528 Anycast + \u5730\u7406 DNS \u7684\u6df7\u5408\u7b56\u7565\uff1aAnycast \u63d0\u4f9b\u5feb\u901f\u5c31\u8fd1\u8def\u7531\uff0c\u5730\u7406 DNS \u5728 Anycast \u51fa\u73b0\u8def\u7531\u5f02\u5e38\u65f6\u53ef\u505a\u56de\u9000\u3002<\/li>\n<li>\u5728\u8fb9\u7f18\u542f\u7528 TLS \u4f1a\u8bdd\u91cd\u7528\u3001OCSP stapling \u4ee5\u53ca HTTP\/2 \u6216 QUIC\uff08HTTP\/3\uff09\u4ee5\u51cf\u5c11\u63e1\u624b\u5ef6\u8fdf\u3002<\/li>\n<li>\u5bf9\u52a8\u6001\u8bf7\u6c42\u53ef\u91c7\u7528\u667a\u80fd\u56de\u6e90\uff1a\u5bf9\u5ef6\u8fdf\u654f\u611f\u7684 API \u8bf7\u6c42\u4f18\u5148\u5c31\u8fd1\u56de\u6e90\u6216\u91c7\u7528\u591a\u6d3b\u56de\u6e90\u3002<\/li>\n<\/ul>\n<h3>2. \u533a\u57df\u6545\u969c\u5207\u6362\u4e0e\u9ad8\u53ef\u7528<\/h3>\n<p>\u5f53\u67d0\u533a\u57df\u8282\u70b9\u4e0d\u53ef\u8fbe\u65f6\uff0c\u5fc5\u987b\u4fdd\u8bc1\u5e73\u6ed1\u5207\u6362\u5e76\u5c3d\u91cf\u907f\u514d\u6d41\u91cf\u9707\u8361\uff1a<\/p>\n<ul>\n<li>\u914d\u7f6e\u591a\u7ea7\u5065\u5eb7\u68c0\u67e5\uff1a\u8fb9\u7f18\u8282\u70b9\u672c\u5730\u5065\u5eb7\u68c0\u67e5 + \u4e2d\u592e\u63a7\u5236\u53f0\u6c47\u603b\u3002\u5f53\u8282\u70b9\u77ed\u65f6\u5f02\u5e38\uff0c\u5148\u505a\u8f6f\u4e0b\u7ebf\uff08\u964d\u4f4e\u6743\u91cd\uff09\uff0c\u957f\u671f\u5f02\u5e38\u518d\u5168\u91cf\u5254\u9664\u3002<\/li>\n<li>\u4f7f\u7528\u52a0\u6743\u8def\u7531\u4e0e\u6d41\u91cf\u7f13\u51b2\uff1a\u9010\u6b65\u964d\u4f4e\u6545\u969c\u8282\u70b9\u6743\u91cd\uff0c\u800c\u975e\u77ac\u95f4\u5207\u65ad\uff0c\u4ee5\u907f\u514d\u5207\u6362\u5cf0\u503c\u5f71\u54cd\u5176\u4ed6\u8282\u70b9\u3002<\/li>\n<li>\u5728\u56de\u6e90\u94fe\u8def\u4e2d\u52a0\u5165\u201corigin shielding\u201d\uff08\u539f\u70b9\u9632\u62a4\uff09\u8282\u70b9\uff0c\u51cf\u5c11\u5bf9\u6e90\u7ad9\u7684\u5e76\u53d1\u538b\u57ae\u98ce\u9669\u3002<\/li>\n<\/ul>\n<h3>3. \u533a\u57df\u5bb9\u91cf\u4e0e\u5f39\u6027\u4f38\u7f29<\/h3>\n<p>\u5e94\u5bf9\u6d41\u91cf\u7a81\u53d1\u9700\u8981\u7ed3\u5408\u81ea\u52a8\u6269\u7f29\u5bb9\u4e0e\u6d41\u91cf\u8c03\u5ea6\uff1a<\/p>\n<ul>\n<li>\u8fb9\u7f18\u8282\u70b9\u5e94\u652f\u6301\u6309\u9700\u6269\u5bb9\u5b9e\u4f8b\uff0c\u7ed3\u5408\u8d1f\u8f7d\u9884\u6d4b\u81ea\u52a8\u8c03\u6574 Nginx\/HAProxy \u7684 upstream \u6743\u91cd\u3002<\/li>\n<li>\u5bf9\u5927\u6587\u4ef6\u6216\u89c6\u9891\u91c7\u7528\u5206\u6bb5\u3001\u5206\u7247\u4e0b\u8f7d\uff08range requests\uff09\u5e76\u7ed3\u5408\u591a\u6e90\u4e0b\u8f7d\uff08multipart\uff09\u7b56\u7565\uff0c\u63d0\u5347\u5e26\u5bbd\u5229\u7528\u7387\u4e0e\u5bb9\u9519\u6027\u3002<\/li>\n<\/ul>\n<h2>\u5173\u952e\u4f18\u5316\u6280\u5de7\uff08\u6280\u672f\u7ec6\u8282\uff09<\/h2>\n<h3>\u667a\u80fd\u63a2\u6d4b\u4e0e\u8bc4\u5206\u7cfb\u7edf<\/h3>\n<p>\u6784\u5efa\u4e00\u4e2a\u591a\u7ef4\u5ea6\u8bc4\u5206\u5668\uff0c\u5c06\u4ee5\u4e0b\u6307\u6807\u7efc\u5408\u4e3a\u8282\u70b9\u5206\u6570\uff1a<\/p>\n<ul>\n<li>\u5e73\u5747 RTT\u300195 \u767e\u5206\u4f4d\u54cd\u5e94\u65f6\u95f4<\/li>\n<li>\u8bf7\u6c42\u6210\u529f\u7387\uff082xx \u6bd4\u4f8b\uff09\u548c\u9519\u8bef\u7387\uff084xx\/5xx\uff09<\/li>\n<li>\u5e26\u5bbd\u4f7f\u7528\u7387\u4e0e CPU\/\u5185\u5b58\u8d1f\u8f7d<\/li>\n<li>\u4f1a\u8bdd\u5efa\u7acb\u5931\u8d25\u7387\u3001TLS \u63e1\u624b\u65f6\u957f<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u6ed1\u52a8\u7a97\u53e3\u4e0e\u6307\u6570\u52a0\u6743\u79fb\u52a8\u5e73\u5747\uff08EWMA\uff09\u5e73\u6ed1\u7a81\u53d1\u566a\u97f3\u3002\u57fa\u4e8e\u5206\u6570\u505a\u52a8\u6001\u6743\u91cd\u5206\u914d\u6216\u8def\u7531\u4f18\u5148\u7ea7\u8c03\u6574\u3002<\/p>\n<h3>\u7f13\u5b58\u7b56\u7565\u4e0e Cache Key \u4f18\u5316<\/h3>\n<p>\u5408\u7406\u7684\u7f13\u5b58\u7b56\u7565\u80fd\u663e\u8457\u964d\u4f4e\u56de\u6e90\u538b\u529b\u4e0e\u5ef6\u8fdf\uff1a<\/p>\n<ul>\n<li>\u8bbe\u8ba1\u7cbe\u7ec6\u7684 Cache-Control \u4e0e Vary \u5934\uff0c\u51cf\u5c11\u7f13\u5b58\u6c61\u67d3\u3002<\/li>\n<li>\u7edf\u4e00 Cache Key\uff08\u53bb\u9664\u4e0d\u5fc5\u8981\u7684 query string\u3001\u6392\u5e8f\u53c2\u6570\uff09\uff0c\u4f7f\u7528\u4e00\u81f4\u6027\u54c8\u5e0c\u5206\u5e03\u9759\u6001\u5bf9\u8c61\u4ee5\u63d0\u9ad8\u547d\u4e2d\u7387\u3002<\/li>\n<li>\u91c7\u7528 Cache Warming\uff08\u9884\u70ed\uff09\u4e0e\u4e3b\u52a8\u5237\u65b0 API\uff0c\u907f\u514d\u51b7\u542f\u52a8\u6296\u52a8\u3002<\/li>\n<\/ul>\n<h3>\u4f1a\u8bdd\u9ecf\u5ea6\u4e0e\u52a8\u6001\u5185\u5bb9\u5904\u7406<\/h3>\n<p>\u5bf9\u4e8e\u9700\u8981\u4f1a\u8bdd\u9ecf\u5ea6\u7684\u5e94\u7528\uff08\u5982\u540e\u53f0\u7ba1\u7406\u3001\u5728\u7ebf\u6e38\u620f\uff09\uff1a<\/p>\n<ul>\n<li>\u4f18\u5148\u5229\u7528\u5e94\u7528\u5c42\u4f1a\u8bdd\u5b58\u50a8\uff08Redis\u3001Memcached\uff09\u6216\u5168\u5c40\u4f1a\u8bdd\u4e2d\u5fc3\uff0c\u4ee5\u907f\u514d\u4f9d\u8d56\u5355\u8282\u70b9\u9ecf\u6027\u3002<\/li>\n<li>\u82e5\u5fc5\u987b\u7c98\u6027\uff0c\u53ef\u4ee5\u7528\u57fa\u4e8e cookie \u7684\u7c98\u6027\u7b56\u7565\u6216\u57fa\u4e8e\u4e00\u81f4\u6027\u54c8\u5e0c\u7684\u8fde\u63a5\u5206\u914d\uff0c\u4f7f\u8fc1\u79fb\u6210\u672c\u964d\u5230\u6700\u4f4e\u3002<\/li>\n<\/ul>\n<h3>\u4f20\u8f93\u5c42\u4e0e\u534f\u8bae\u4f18\u5316<\/h3>\n<p>\u542f\u7528\u73b0\u4ee3\u4f20\u8f93\u534f\u8bae\u5e26\u6765\u663e\u8457\u5ef6\u8fdf\u6539\u5584\uff1a<\/p>\n<ul>\n<li>\u652f\u6301 HTTP\/2 \u591a\u8def\u590d\u7528\uff0c\u51cf\u5c11 TCP \u8fde\u63a5\u6570\uff1b\u652f\u6301 QUIC\/HTTP\/3 \u4ee5\u51cf\u5c11\u4e22\u5305\u4e0b\u5ef6\u8fdf\u3002<\/li>\n<li>\u542f\u7528 TLS \u4f1a\u8bdd\u7968\u8bc1\uff08session tickets\uff09\u4e0e 0-RTT\uff08\u5728\u5b89\u5168\u573a\u666f\u4e0b\u8c28\u614e\u4f7f\u7528\uff09\uff0c\u63d0\u9ad8\u590d\u7528\u7387\u3002<\/li>\n<\/ul>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1aDNS \u8def\u7531 vs Anycast vs \u5e94\u7528\u5c42\u8c03\u5ea6<\/h2>\n<ul>\n<li><strong>DNS \u8def\u7531<\/strong>\uff1a\u90e8\u7f72\u7b80\u5355\u3001\u8de8\u4f9b\u5e94\u5546\u53ef\u7528\uff0c\u4f46\u53d7 DNS TTL \u4e0e\u89e3\u6790\u5668\u7f13\u5b58\u5f71\u54cd\uff0c\u5207\u6362\u8f83\u6162\uff0c\u9002\u5408\u9759\u6001\u6743\u91cd\u5206\u914d\u3002<\/li>\n<li><strong>Anycast<\/strong>\uff1a\u5207\u6362\u5feb\u3001\u5bf9\u7b49\u8def\u7531\u597d\u5904\u660e\u663e\uff0c\u9002\u5408\u5168\u7403\u89c4\u6a21\u90e8\u7f72\u3002\u4f46\u5bf9\u56de\u6e90\u8def\u5f84\u3001\u5730\u7406\u7cbe\u786e\u6027\u4e0e\u6545\u969c\u6392\u67e5\u8981\u6c42\u66f4\u9ad8\u3002<\/li>\n<li><strong>\u5e94\u7528\u5c42\u8c03\u5ea6<\/strong>\uff1a\u6700\u7075\u6d3b\uff0c\u53ef\u4f9d\u636e\u5b9e\u65f6\u6027\u80fd\u505a\u7cbe\u7ec6\u8c03\u5ea6\uff0c\u4f46\u9700\u8981\u66f4\u591a\u5b9e\u65f6\u76d1\u6d4b\u4e0e\u590d\u6742\u63a7\u5236\u5e73\u9762\u3002<\/li>\n<\/ul>\n<p>\u5b9e\u9645\u751f\u4ea7\u4e2d\u63a8\u8350\u91c7\u7528\u6df7\u5408\u7b56\u7565\uff1aAnycast \u505a\u5e38\u89c4\u8def\u7531+\u5e94\u7528\u5c42\u505a\u7cbe\u7ec6\u8c03\u5ea6+DNS \u505a\u533a\u57df\u7ea7\u522b\u6d41\u91cf\u5206\u914d\u3002<\/p>\n<h2>\u8282\u70b9\u9009\u5740\u4e0e\u9009\u8d2d\u5efa\u8bae<\/h2>\n<p>\u8282\u70b9\u9009\u5740\u76f4\u63a5\u5f71\u54cd\u5ef6\u8fdf\u4e0e\u5e02\u573a\u8986\u76d6\uff0c\u9009\u62e9\u65f6\u5e94\u8003\u8651\uff1a<\/p>\n<ul>\n<li>\u76ee\u6807\u7528\u6237\u5206\u5e03\uff1a\u4e9a\u592a\u7528\u6237\u4f18\u5148\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u65b0\u52a0\u5761\u3001\u9996\u5c14\uff1b\u7f8e\u6d32\u7528\u6237\u8986\u76d6\u7f8e\u56fd\u670d\u52a1\u5668\u4e0e\u7f8e\u56fd VPS 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