{"id":209549,"date":"2025-10-23T16:45:57","date_gmt":"2025-10-23T08:45:57","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209549\/"},"modified":"2025-10-23T16:45:58","modified_gmt":"2025-10-23T08:45:58","slug":"cdn-33","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209549\/","title":{"rendered":"CDN\u8d1f\u8f7d\u5747\u8861\u4f18\u5316\u5b9e\u6218\uff1a\u4ece\u7b97\u6cd5\u5230\u90e8\u7f72\u7684\u6027\u80fd\u63d0\u5347\u6307\u5357"},"content":{"rendered":"<p>\u968f\u7740\u4e92\u8054\u7f51\u5e94\u7528\u5bf9\u6027\u80fd\u548c\u53ef\u7528\u6027\u7684\u8981\u6c42\u65e5\u76ca\u63d0\u9ad8\uff0cCDN \u5728\u73b0\u4ee3\u67b6\u6784\u4e2d\u627f\u62c5\u7740\u4e0d\u53ef\u66ff\u4ee3\u7684\u89d2\u8272\u3002\u672c\u6587\u4ece\u7b97\u6cd5\u539f\u7406\u5230\u5de5\u7a0b\u90e8\u7f72\uff0c\u7ed3\u5408\u5b9e\u9645\u573a\u666f\u4e0e\u6027\u80fd\u6307\u6807\uff0c\u7cfb\u7edf\u6027\u8bb2\u89e3\u5982\u4f55\u5bf9 CDN \u8d1f\u8f7d\u5747\u8861\u8fdb\u884c\u4f18\u5316\uff0c\u5e2e\u52a9\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\u5728\u8de8\u5883\u8bbf\u95ee\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\u573a\u666f\uff09\u4e2d\u83b7\u5f97\u66f4\u7a33\u5b9a\u3001\u66f4\u4f4e\u5ef6\u8fdf\u7684\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<h2>\u57fa\u7840\u539f\u7406\uff1a\u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5\u4e0e\u7f13\u5b58\u7b56\u7565<\/h2>\n<h3>\u5e38\u89c1\u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5\u53ca\u9002\u7528\u573a\u666f<\/h3>\n<ul>\n<li><strong>\u8f6e\u8be2\uff08Round Robin\uff09<\/strong>\uff1a\u5b9e\u73b0\u7b80\u5355\uff0c\u9002\u5408\u540e\u7aef\u8282\u70b9\u6027\u80fd\u76f8\u8fd1\u7684\u573a\u666f\uff0c\u4f46\u5bf9\u77ed\u65f6\u6d41\u91cf\u7a81\u53d1\u6216\u957f\u8fde\u63a5\u652f\u6301\u4e0d\u8db3\u3002<\/li>\n<li><strong>\u52a0\u6743\u8f6e\u8be2\uff08Weighted Round Robin\uff09<\/strong>\uff1a\u4e3a\u4e0d\u540c\u6027\u80fd\u7684\u8282\u70b9\u5206\u914d\u6743\u91cd\uff0c\u9002\u5408\u5f02\u6784\u670d\u52a1\u5668\u7fa4\uff08\u4f8b\u5982\u6df7\u5408\u4f7f\u7528\u9999\u6e2fVPS \u4e0e\u7f8e\u56fdVPS \u7684\u6df7\u5408\u67b6\u6784\uff09\u3002<\/li>\n<li><strong>\u6700\u5c11\u8fde\u63a5\uff08Least Connections\uff09<\/strong>\uff1a\u9002\u7528\u4e8e\u8fde\u63a5\u65f6\u95f4\u5dee\u5f02\u8f83\u5927\u7684\u5e94\u7528\uff08\u5982\u52a8\u6001\u8bf7\u6c42\u4e0e\u957f\u8f6e\u8be2\uff09\uff0c\u80fd\u66f4\u597d\u5730\u5e73\u8861\u5e76\u53d1\u538b\u529b\u3002<\/li>\n<li><strong>\u6e90\u5730\u5740\u54c8\u5e0c \/ \u4e00\u81f4\u6027\u54c8\u5e0c\uff08Consistent Hashing\uff09<\/strong>\uff1a\u4fdd\u8bc1\u540c\u4e00\u7528\u6237\u8bf7\u6c42\u8def\u7531\u5230\u540c\u4e00\u540e\u7aef\uff0c\u9002\u5408\u4f1a\u8bdd\u7c98\u6027\u6216\u5206\u5e03\u5f0f\u7f13\u5b58\u573a\u666f\u3002<\/li>\n<li><strong>\u57fa\u4e8e\u6027\u80fd\/\u5ef6\u8fdf\u7684\u8def\u7531\uff08Latency-based \/ Health-aware\uff09<\/strong>\uff1a\u7ed3\u5408\u5b9e\u65f6\u76d1\u63a7\u9009\u62e9\u6700\u4f18\u8282\u70b9\uff0c\u9002\u5408\u8de8\u56fd\u90e8\u7f72\uff08\u6bd4\u5982\u9009\u62e9\u6700\u90bb\u8fd1\u7684\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\u8282\u70b9\uff09\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u4e0e\u5931\u6548\u7b56\u7565<\/h3>\n<p>\u7f13\u5b58\u7b56\u7565\u662f CDN \u4f18\u5316\u7684\u6838\u5fc3\uff1a\u5408\u7406\u7684 <strong>Cache-Control<\/strong>\u3001ETag\u3001Expires \u5934\u53ef\u4ee5\u5927\u5e45\u63d0\u5347\u547d\u4e2d\u7387\u3002\u5b9e\u8df5\u4e2d\u5e38\u7528\u6280\u672f\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u533a\u5206\u9759\u6001\u8d44\u6e90\u4e0e\u52a8\u6001\u63a5\u53e3\uff0c\u9759\u6001\u8d44\u6e90\u8bbe\u7f6e\u8f83\u957f TTL\uff0c\u52a8\u6001\u63a5\u53e3\u4f7f\u7528\u77ed TTL \u6216\u57fa\u4e8e\u952e\u7684\u7f13\u5b58\u3002<\/li>\n<li>\u4f7f\u7528 <strong>\u5206\u6bb5\u7f13\u5b58<\/strong>\uff08Range Requests\uff09\u4e0e\u5206\u7247\u7f13\u5b58\uff0c\u914d\u5408\u4e00\u81f4\u6027\u54c8\u5e0c\u51cf\u5c0f\u51b7\u70ed\u6570\u636e\u6296\u52a8\u3002<\/li>\n<li>\u652f\u6301\u7f13\u5b58\u9884\u70ed\uff08cache warming\uff09\u548c\u5ef6\u8fdf\u5931\u6548\uff08stale-while-revalidate \/ stale-if-error\uff09\u4ee5\u4fdd\u8bc1\u6296\u53d1\u6d41\u91cf\u65f6\u7684\u7a33\u5b9a\u6027\u3002<\/li>\n<li>\u5b9e\u73b0\u7ec6\u7c92\u5ea6\u7684\u7f13\u5b58\u6e05\u7406\u673a\u5236\uff08\u6309 URL\u3001\u6309\u6807\u7b7e\u3001\u6309\u524d\u7f00\uff09\uff0c\u5e76\u7ed3\u5408\u5f02\u6b65\u6e05\u9664\u4ee5\u907f\u514d\u6e05\u9664\u98ce\u66b4\u3002<\/li>\n<\/ul>\n<h2>\u5de5\u7a0b\u5b9e\u73b0\uff1a\u534f\u8bae\u4e0e\u7f51\u7edc\u5c42\u4f18\u5316<\/h2>\n<h3>\u4f20\u8f93\u534f\u8bae\u4e0e\u5b89\u5168\u6027<\/h3>\n<ul>\n<li>\u542f\u7528 HTTP\/2 \u6216 HTTP\/3\uff08QUIC\uff09\u53ef\u4ee5\u663e\u8457\u964d\u4f4e\u591a\u8d44\u6e90\u52a0\u8f7d\u7684\u5ef6\u8fdf\uff0c\u5c24\u5176\u5728\u9ad8\u4e22\u5305\u6216\u79fb\u52a8\u7f51\u7edc\u73af\u5883\u4e0b\u6548\u679c\u660e\u663e\u3002<\/li>\n<li>\u5728\u8fb9\u7f18\u8282\u70b9\u542f\u7528 TLS \u7ec8\u6b62\uff0c\u7ed3\u5408 OCSP Stapling\u3001\u65e9\u671f\u6570\u636e\uff080-RTT\uff09\u7684\u5408\u7406\u4f7f\u7528\uff0c\u51cf\u5c11\u63e1\u624b\u5ef6\u8fdf\u3002\u4f46\u6ce8\u610f 0-RTT \u5e26\u6765\u7684\u91cd\u653e\u98ce\u9669\u3002<\/li>\n<li>\u91c7\u7528\u8bc1\u4e66\u7ba1\u7406\u81ea\u52a8\u5316\uff08ACME \/ Certbot \/ Let&#8217;s Encrypt \u6216\u96c6\u4e2d\u5f0f\u8bc1\u4e66\u7ba1\u7406\uff09\u786e\u4fdd\u8bc1\u4e66\u8f6e\u8f6c\u65e0\u7f1d\u3002<\/li>\n<\/ul>\n<h3>\u7f51\u7edc\u5c42\u4e0e Anycast\/GSLB<\/h3>\n<p>Anycast + BGP \u662f\u63d0\u5347 CDN \u8fb9\u7f18\u53ef\u8fbe\u6027\u548c\u964d\u4f4e\u5ef6\u8fdf\u7684\u5229\u5668\u3002\u7ed3\u5408\u5168\u5c40\u6d41\u91cf\u8c03\u5ea6\uff08GSLB\uff09\uff0c\u53ef\u6309\u5730\u7406\u4f4d\u7f6e\u3001\u94fe\u8def\u5065\u5eb7\u4e0e\u8d1f\u8f7d\u9009\u62e9\u8282\u70b9\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5728\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u65b0\u52a0\u5761\u3001\u6d1b\u6749\u77f6\u7b49\u70b9\u4f4d\u90e8\u7f72 POP\uff0c\u7136\u540e\u901a\u8fc7 Anycast \u5e7f\u64ad\u540c\u4e00 IP\uff0c\u7528\u6237\u4f1a\u81ea\u52a8\u5c31\u8fd1\u8def\u7531\u3002<\/li>\n<li>\u5f53\u8fb9\u7f18\u8282\u70b9\u906d\u9047\u94fe\u8def\u5f02\u5e38\uff0c\u53ef\u7531 GSLB \u5feb\u901f\u5c06\u6d41\u91cf\u5bfc\u5411\u5907\u7528\u7ad9\u70b9\uff08\u5982\u7531\u9999\u6e2f\u670d\u52a1\u5668\u5207\u6362\u5230\u7f8e\u56fd\u670d\u52a1\u5668 \u6216\u65e5\u672c\u670d\u52a1\u5668\uff09\u3002<\/li>\n<li>\u7ed3\u5408\u4e3b\u52a8\/\u88ab\u52a8\u5065\u5eb7\u68c0\u67e5\uff08TCP\/HTTP + \u81ea\u5b9a\u4e49\u63a2\u6d4b\uff09\u5224\u65ad\u8282\u70b9\u53ef\u7528\u6027\uff0c\u907f\u514d\u9ed1\u6d1e\u6d41\u91cf\u3002<\/li>\n<\/ul>\n<h2>\u7f13\u5b58\u5c42\u4e0e\u53cd\u5411\u4ee3\u7406\u6280\u672f\u6808<\/h2>\n<h3>\u5e38\u89c1\u8f6f\u4ef6\u4e0e\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n<ul>\n<li><strong>NGINX \/ OpenResty<\/strong>\uff1a\u9ad8\u6027\u80fd\u3001\u7075\u6d3b\u7684\u8fb9\u7f18\u4ee3\u7406\uff0c\u9002\u5408\u505a\u7f13\u5b58\u89c4\u5219\u3001\u52a8\u6001\u8def\u7531\u4e0e\u901f\u7387\u9650\u5236\u3002<\/li>\n<li><strong>Varnish<\/strong>\uff1a\u7528\u4e8e\u9ad8\u541e\u5410\u9759\u6001\u5185\u5bb9\u7f13\u5b58\uff0cVCL \u63d0\u4f9b\u5f3a\u5927\u7684\u7f13\u5b58\u7b56\u7565\u6269\u5c55\u80fd\u529b\u3002<\/li>\n<li><strong>HAProxy \/ Envoy<\/strong>\uff1a\u9002\u5408\u505a L4\/L7 \u7684\u8d1f\u8f7d\u5747\u8861\u4e0e\u670d\u52a1\u7f51\u683c\u4fa7\u8f66\u4ee3\u7406\uff0c\u652f\u6301\u9ad8\u7ea7\u5065\u5eb7\u68c0\u67e5\u4e0e\u7194\u65ad\u7b56\u7565\u3002<\/li>\n<li>\u7ed3\u5408 <strong>Origin Shield<\/strong> \u8bbe\u8ba1\u4ee5\u51cf\u5c11\u56de\u6e90\u91cf\uff0c\u591a\u4e2a\u8fb9\u7f18\u5171\u4eab\u540c\u4e00\u4e2d\u95f4\u5c42\u56de\u6e90\u70b9\u53ef\u4ee5\u663e\u8457\u964d\u4f4e\u56de\u6e90\u538b\u529b\u3002<\/li>\n<\/ul>\n<h3>\u8fb9\u7f18\u903b\u8f91\u4e0e\u52a8\u6001\u8bf7\u6c42\u52a0\u901f<\/h3>\n<p>\u5bf9\u4e8e\u9700\u8981\u8fb9\u7f18\u5904\u7406\u7684\u52a8\u6001\u8bf7\u6c42\uff0c\u53ef\u4ee5\u5728\u8fb9\u7f18\u8282\u70b9\u5b9e\u73b0\u8f7b\u91cf\u903b\u8f91\uff1aA\/B \u6d4b\u8bd5\u8def\u7531\u3001\u56fe\u7247\u88c1\u526a\u4e0e\u538b\u7f29\u3001\u8eab\u4efd\u8ba4\u8bc1\u524d\u7f6e\u7b49\u3002\u914d\u5408 Lambda@Edge \u6216\u8fb9\u7f18\u51fd\u6570\uff08Edge Functions\uff09\uff0c\u5c06\u5b9e\u65f6\u5904\u7406\u79fb\u81f3\u66f4\u9760\u8fd1\u7528\u6237\u7684\u4f4d\u7f6e\uff0c\u964d\u4f4e\u56de\u6e90\u5ef6\u8fdf\u3002<\/p>\n<h2>\u6027\u80fd\u6307\u6807\u3001\u76d1\u63a7\u4e0e\u6545\u969c\u6f14\u7ec3<\/h2>\n<h3>\u5173\u952e\u6307\u6807\uff08KPIs\uff09<\/h3>\n<ul>\n<li>\u7f13\u5b58\u547d\u4e2d\u7387\uff08Hit Ratio\uff09\u2014\u2014\u76f4\u63a5\u5173\u7cfb\u5230\u56de\u6e90 QPS \u4e0e\u5ef6\u8fdf\u3002<\/li>\n<li>P95 \/ P99 \u54cd\u5e94\u65f6\u95f4\u2014\u2014\u8861\u91cf\u5c3e\u5ef6\u8fdf\u3002<\/li>\n<li>RPS\uff08Requests Per Second\uff09\u4e0e\u5e26\u5bbd\uff08Mbps\uff09\u2014\u2014\u5bb9\u91cf\u89c4\u5212\u4f9d\u636e\u3002<\/li>\n<li>\u540e\u7aef\u5065\u5eb7\u7387\u4e0e\u9519\u8bef\u7387\uff085xx\u30014xx\uff09\u2014\u2014\u7528\u4e8e\u81ea\u52a8\u5316\u6d41\u91cf\u5207\u6362\u3002<\/li>\n<\/ul>\n<h3>\u76d1\u63a7\u4e0e\u544a\u8b66\u4f53\u7cfb<\/h3>\n<p>\u4f7f\u7528 Prometheus + Grafana \u6216\u5546\u4e1a\u76d1\u63a7\uff08NewRelic\u3001Datadog\uff09\u91c7\u96c6\u8fb9\u7f18\u4e0e\u56de\u6e90\u7684\u6307\u6807\u3002\u65e5\u5fd7\u805a\u5408\uff08ELK \/ Loki\uff09\u7528\u4e8e\u8bf7\u6c42\u8ffd\u8e2a\u4e0e\u6545\u969c\u5b9a\u4f4d\u3002\u5173\u952e\u70b9\uff1a<\/p>\n<ul>\n<li>\u5b9e\u73b0\u7aef\u5230\u7aef\u7684\u5206\u5e03\u5f0f\u8ffd\u8e2a\uff08Jaeger \/ Zipkin\uff09\uff0c\u5b9a\u4f4d\u8de8\u5730\u57df\u8bf7\u6c42\u74f6\u9888\u3002<\/li>\n<li>\u8bbe\u7f6e\u57fa\u4e8e SLA \u7684\u544a\u8b66\uff1a\u4f8b\u5982\u7f13\u5b58\u547d\u4e2d\u7387\u4f4e\u4e8e\u9608\u503c\u6216 P95 \u8d85\u8fc7\u9608\u503c\u65f6\u89e6\u53d1\u81ea\u52a8\u5316\u5e94\u5bf9\u7b56\u7565\u3002<\/li>\n<li>\u5b9a\u671f\u8fdb\u884c\u6545\u969c\u6f14\u7ec3\uff08chaos testing\uff09\uff0c\u9a8c\u8bc1 GSLB\u3001Anycast\u3001\u5065\u5eb7\u68c0\u67e5\u4e0e\u81ea\u52a8\u5207\u6362\u7684\u53ef\u7528\u6027\u3002<\/li>\n<\/ul>\n<h2>\u6d41\u91cf\u7ba1\u7406\u4e0e\u5b89\u5168\u786c\u5316<\/h2>\n<h3>\u9632\u62a4\u4e0e\u9650\u6d41<\/h3>\n<p>\u5728\u8fb9\u7f18\u5b9e\u73b0\u901f\u7387\u9650\u5236\u3001IP \u9ed1\u767d\u540d\u5355\u3001WAF \u89c4\u5219\u548c\u53cd\u722c\u866b\u7b56\u7565\uff0c\u51cf\u5c11\u6076\u610f\u6d41\u91cf\u5bf9\u56de\u6e90\u7684\u51b2\u51fb\u3002\u914d\u5408 SYN Cookie\u3001TCP \u4f18\u5316\u4e0e\u8fde\u63a5\u590d\u7528\uff0c\u63d0\u5347\u5728\u7f51\u7edc\u653b\u51fb\u65f6\u7684\u97e7\u6027\u3002<\/p>\n<h3>\u8d39\u7387\u4e0e\u6210\u672c\u4f18\u5316<\/h3>\n<p>\u5408\u7406\u5212\u5206\u7f13\u5b58\u5c42\u6b21\uff08\u8fd1\u7aef\u7f13\u5b58 + \u4e2d\u95f4\u7f13\u5b58 + 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