{"id":209897,"date":"2025-10-24T00:55:46","date_gmt":"2025-10-23T16:55:46","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209897\/"},"modified":"2025-10-24T00:55:47","modified_gmt":"2025-10-23T16:55:47","slug":"cdn-182","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209897\/","title":{"rendered":"CDN\u6280\u672f\u652f\u6301\u54cd\u5e94\u901f\u5ea6\u8bc4\u6d4b\uff1a\u8c01\u80fd\u8d62\u5f97\u6beb\u79d2\u4e4b\u4e89\uff1f"},"content":{"rendered":"<p>\u5728\u4e92\u8054\u7f51\u6027\u80fd\u7ade\u4e89\u65e5\u76ca\u6fc0\u70c8\u7684\u4eca\u5929\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u6210\u4e3a\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u7684\u5173\u952e\u56e0\u7d20\u4e4b\u4e00\u3002\u5bf9\u4e8e\u9762\u5411\u4e9a\u592a\u548c\u5168\u7403\u7528\u6237\u7684\u7ad9\u957f\u3001\u4f01\u4e1a\u548c\u5f00\u53d1\u8005\u800c\u8a00\uff0c<strong>\u6bcf\u4e00\u6beb\u79d2\u7684\u54cd\u5e94\u65f6\u95f4<\/strong>\u90fd\u53ef\u80fd\u51b3\u5b9a\u8f6c\u5316\u7387\u4e0e\u7528\u6237\u7559\u5b58\u7387\u3002\u672c\u7bc7\u5c06\u6df1\u5165\u89e3\u6790CDN\u6280\u672f\u5982\u4f55\u5f71\u54cd\u54cd\u5e94\u901f\u5ea6\u7684\u8bc4\u6d4b\u7ed3\u679c\uff0c\u5448\u73b0\u6d4b\u8bc4\u65b9\u6cd5\u3001\u5173\u952e\u6307\u6807\u3001\u6280\u672f\u7ec6\u8282\u4e0e\u5b9e\u9645\u9009\u8d2d\u5efa\u8bae\uff0c\u5e2e\u52a9\u60a8\u5728\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u3001\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u7b49\u57fa\u7840\u8bbe\u65bd\u4e0a\u6784\u5efa\u66f4\u5feb\u3001\u66f4\u7a33\u5b9a\u7684\u5206\u53d1\u4f53\u7cfb\u3002<\/p>\n<h2>\u5f15\u8a00\uff1a\u4e3a\u4f55\u8981\u5bf9CDN\u54cd\u5e94\u901f\u5ea6\u8fdb\u884c\u6beb\u79d2\u7ea7\u8bc4\u6d4b<\/h2>\n<p>CDN\u7684\u6838\u5fc3\u76ee\u6807\u662f\u5c06\u5185\u5bb9\u5c3d\u53ef\u80fd\u9760\u8fd1\u7ec8\u7aef\u7528\u6237\uff0c\u4ece\u800c\u964d\u4f4e\u7f51\u7edc\u4f20\u8f93\u65f6\u5ef6\u3002\u4f46\u5b9e\u9645\u54cd\u5e94\u65f6\u95f4\u7531\u591a\u4e2a\u56e0\u7d20\u53e0\u52a0\u51b3\u5b9a\uff0c\u5305\u62ec\u7f51\u7edc\u5f80\u8fd4\u65f6\u5ef6\uff08RTT\uff09\u3001TLS\u63e1\u624b\u65f6\u95f4\u3001\u4f20\u8f93\u534f\u8bae\u6548\u7387\u3001\u7f13\u5b58\u547d\u4e2d\u7387\u4e0e\u8fb9\u7f18\u8282\u70b9\u6027\u80fd\u7b49\u3002\u5bf9\u4e8e\u7535\u5546\u3001\u5a92\u4f53\u3001API\u670d\u52a1\u7b49\u573a\u666f\uff0c\u6beb\u79d2\u7ea7\u7684\u63d0\u5347\u80fd\u76f4\u63a5\u8f6c\u5316\u4e3a\u66f4\u597d\u4f53\u9a8c\u548c\u66f4\u9ad8\u6536\u76ca\uff0c\u56e0\u6b64\u5efa\u7acb\u79d1\u5b66\u3001\u53ef\u91cd\u590d\u7684\u8bc4\u6d4b\u6d41\u7a0b\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<h2>CDN\u54cd\u5e94\u901f\u5ea6\u8bc4\u6d4b\u7684\u539f\u7406\u4e0e\u5173\u952e\u6307\u6807<\/h2>\n<h3>\u8bc4\u6d4b\u539f\u7406\u6982\u89c8<\/h3>\n<p>\u8bc4\u6d4b\u672c\u8d28\u662f\u901a\u8fc7\u6a21\u62df\u771f\u5b9e\u8bf7\u6c42\u6d41\u91cf\uff0c\u4ece\u4e0d\u540c\u5730\u7406\u4f4d\u7f6e\u3001\u4e0d\u540c\u7f51\u7edc\u6761\u4ef6\u53d1\u8d77\u8bf7\u6c42\uff0c\u6d4b\u91cf\u4eceDNS\u89e3\u6790\u5230\u5185\u5bb9\u5b8c\u5168\u4ea4\u4ed8\u7684\u5168\u8fc7\u7a0b\u3002\u6838\u5fc3\u73af\u8282\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>DNS\u89e3\u6790\u65f6\u95f4\uff08DNS Lookup\uff09\uff1aAnycast\u52a0\u901f\u4e0eDNS\u9884\u53d6\u5f71\u54cd\u663e\u8457\u3002<\/li>\n<li>TCP\/TLS\u63e1\u624b\u65f6\u95f4\uff1a\u5305\u62ec\u4e09\u6b21\u63e1\u624b\u3001\u8bc1\u4e66\u4ea4\u6362\u4e0e\u5bc6\u94a5\u534f\u5546\uff0c\u4f7f\u7528TLS 1.3\u4e0e0-RTT\u53ef\u964d\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<li>\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09\uff1a\u670d\u52a1\u5668\u5904\u7406\u4e0e\u7f51\u7edc\u4f20\u8f93\u5f15\u8d77\u7684\u9996\u5b57\u8282\u5230\u8fbe\u65f6\u95f4\u3002<\/li>\n<li>\u5185\u5bb9\u4f20\u8f93\u65f6\u95f4\uff08Download\uff09\uff1a\u53d7\u5e26\u5bbd\u3001\u5e76\u53d1\u8fde\u63a5\u4e0e\u62e5\u585e\u63a7\u5236\u5f71\u54cd\u3002<\/li>\n<li>\u5b8c\u6574\u54cd\u5e94\u65f6\u95f4\uff08Load Time\uff09\uff1a\u5305\u542b\u6e32\u67d3\u6216\u5ba2\u6237\u7aef\u5904\u7406\u7684\u65f6\u95f4\uff08\u5bf9\u7f51\u9875\u5c24\u4e3a\u91cd\u8981\uff09\u3002<\/li>\n<\/ul>\n<h3>\u5e38\u7528\u8bc4\u6d4b\u6307\u6807<\/h3>\n<ul>\n<li><strong>\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\uff08Average Latency\uff09<\/strong>\uff1a\u4ee3\u8868\u591a\u6570\u8bf7\u6c42\u7684\u4f53\u9a8c\u3002<\/li>\n<li><strong>p95\/p99\u5ef6\u8fdf<\/strong>\uff1a\u5173\u6ce8\u5c3e\u90e8\u8868\u73b0\uff0c\u8861\u91cf\u6781\u7aef\u60c5\u51b5\u4e0b\u7684\u4f53\u9a8c\u3002<\/li>\n<li><strong>\u7f13\u5b58\u547d\u4e2d\u7387\uff08Cache Hit Ratio\uff09<\/strong>\uff1a\u9ad8\u547d\u4e2d\u7387\u76f4\u63a5\u51cf\u5c11\u6e90\u7ad9\u8bbf\u95ee\u4e0e\u56de\u6e90\u5ef6\u8fdf\u3002<\/li>\n<li><strong>\u8bf7\u6c42\u6210\u529f\u7387\uff08Availability\uff09<\/strong>\uff1a\u629b\u5f03\u6389\u8d85\u65f6\u6216\u9519\u8bef\u8bf7\u6c42\u540e\u7684\u6709\u6548\u54cd\u5e94\u7387\u3002<\/li>\n<li><strong>\u5e26\u5bbd\u5229\u7528\u4e0e\u541e\u5410\u91cf<\/strong>\uff1a\u5bf9\u4e8e\u5927\u6587\u4ef6\u5206\u53d1\uff08\u89c6\u9891\u3001\u955c\u50cf\u7b49\uff09\u5c24\u4e3a\u91cd\u8981\u3002<\/li>\n<\/ul>\n<h2>\u8bc4\u6d4b\u65b9\u6cd5\u4e0e\u5b9e\u9a8c\u8bbe\u8ba1\u7ec6\u8282<\/h2>\n<h3>\u5206\u5e03\u5f0f\u63a2\u9488\u4e0e\u53ef\u91cd\u590d\u6027<\/h3>\n<p>\u5efa\u7acb\u5206\u5e03\u5f0f\u63a2\u9488\u7f51\u7edc\uff0c\u8986\u76d6\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u3001\u7f8e\u56fd\u7b49\u5173\u952e\u533a\u57df\u3002\u63a2\u9488\u5e94\u6a21\u62df\u771f\u5b9e\u5ba2\u6237\u7aef\uff0c\u5305\u62ec\u79fb\u52a8\u7f51\u7edc\u4e0e\u56fa\u5b9a\u5bbd\u5e26\uff0c\u4f7f\u7528\u4e0d\u540cISP\u4e0e\u7f51\u7edc\u6761\u4ef6\u8fdb\u884c\u6d4b\u8bd5\u4ee5\u589e\u5f3a\u4ee3\u8868\u6027\u3002\u4e3a\u4fdd\u8bc1\u53ef\u91cd\u590d\u6027\uff0c\u9700\u5728\u591a\u65f6\u6bb5\u3001\u591a\u5929\u91cd\u590d\u91c7\u6837\uff0c\u5e76\u8bb0\u5f55\u7f51\u7edc\u6296\u52a8\u4e0e\u4e22\u5305\u7387\u3002<\/p>\n<h3>\u5bf9\u6bd4\u6d4b\u8bd5\u9879\u8bbe\u8ba1<\/h3>\n<p>\u5728\u5bf9\u6bd4\u4e0d\u540cCDN\u63d0\u4f9b\u5546\u6216\u914d\u7f6e\u65f6\uff0c\u5e94\u4fdd\u6301\u4e00\u81f4\u7684origin\uff08\u53ef\u4e3a\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u4e0e\u8d44\u6e90\u6837\u672c\uff08\u5c0f\u9759\u6001\u8d44\u6e90\u3001\u52a8\u6001API\u3001\u5927\u6587\u4ef6\uff09\uff0c\u6d4b\u8bd5\u9879\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u51b7\u7f13\u5b58\u4e0e\u70ed\u7f13\u5b58\u573a\u666f\uff1a\u6d4b\u91cf\u51b7\u542f\u52a8\u7684\u56de\u6e90\u5ef6\u8fdf\u4e0e\u70ed\u7f13\u5b58\u547d\u4e2d\u540e\u7684\u8fb9\u7f18\u54cd\u5e94\u3002<\/li>\n<li>\u5e76\u53d1\u8fde\u63a5\u6570\u5f71\u54cd\uff1a\u6a21\u62df\u9ad8\u5e76\u53d1\u4e0b\u7684\u961f\u5217\u4e0e\u5e26\u5bbd\u74f6\u9888\u3002<\/li>\n<li>\u534f\u8bae\u5dee\u5f02\uff1aHTTP\/1.1 vs HTTP\/2 vs HTTP\/3\uff08QUIC\uff09\uff0c\u89c2\u5bdf\u9996\u5b57\u8282\u4e0e\u591a\u8d44\u6e90\u52a0\u8f7d\u6548\u7387\u3002<\/li>\n<li>TLS\u4f18\u5316\uff1aOCSP stapling\u3001\u8bc1\u4e66\u94fe\u4f18\u5316\u3001TLS 1.3\u4e0e0-RTT\u5bf9\u63e1\u624b\u65f6\u5ef6\u7684\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h2>\u5f71\u54cdCDN\u54cd\u5e94\u901f\u5ea6\u7684\u5173\u952e\u6280\u672f\u7ec6\u8282<\/h2>\n<h3>Anycast\u4e0e\u8fb9\u7f18PoP\u5e03\u5c40<\/h3>\n<p>Anycast\u8def\u7531\u53ef\u5c06\u5ba2\u6237\u7aef\u6d41\u91cf\u5f15\u5411\u6700\u8fd1\u7684PoP\uff0c\u4ece\u800c\u7f29\u77ed\u7f51\u7edc\u8def\u5f84\u3002<strong>PoP\u7684\u5730\u7406\u5bc6\u5ea6\u548c\u8986\u76d6\u8d28\u91cf<\/strong>\u51b3\u5b9a\u4e86\u8fb9\u7f18\u5ef6\u8fdf\uff0c\u4e9a\u592a\u7528\u6237\u5728\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u9996\u5c14\u3001\u65b0\u52a0\u5761\u7b49PoP\u9644\u8fd1\u53ef\u83b7\u5f97\u663e\u8457\u4f18\u52bf\u3002\u56e0\u6b64\uff0c\u5f53\u76ee\u6807\u7528\u6237\u4e3b\u8981\u5728\u4e9a\u6d32\u65f6\uff0c\u9009\u62e9\u5728\u9999\u6e2f\u6216\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u8282\u70b9\u4e30\u5bcc\u7684CDN\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<h3>\u7f13\u5b58\u7b56\u7565\u4e0e\u56de\u6e90\u4f18\u5316<\/h3>\n<p>\u7f13\u5b58\u7b56\u7565\u76f4\u63a5\u5f71\u54cd\u7f13\u5b58\u547d\u4e2d\u7387\u4e0e\u56de\u6e90\u9891\u7387\u3002\u5e38\u89c1\u6280\u672f\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5408\u7406\u8bbe\u7f6eCache-Control\u3001ETag\u3001Last-Modified\u4e0eTTL\u3002<\/li>\n<li>\u91c7\u7528Origin Shield\u6216\u4e2d\u95f4\u5c42\u7f13\u5b58\u51cf\u5c11\u5bf9\u6e90\u7ad9\uff08\u5982\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u7684\u5e76\u53d1\u56de\u6e90\u8bf7\u6c42\u3002<\/li>\n<li>\u652f\u6301stale-while-revalidate\u4e0estale-if-error\u4ee5\u63d0\u5347\u53ef\u7528\u6027\u4e0e\u51cf\u5c0f\u56de\u6e90\u5cf0\u503c\u3002<\/li>\n<\/ul>\n<h3>\u4f20\u8f93\u534f\u8bae\u4e0e\u62e5\u585e\u63a7\u5236<\/h3>\n<p>HTTP\/2\u7684\u591a\u8def\u590d\u7528\u964d\u4f4e\u4e86TCP\u8fde\u63a5\u5efa\u7acb\u6b21\u6570\uff0c\u4f46\u53d7\u9650\u4e8eTCP\u53d1\u5305\u987a\u5e8f\u95ee\u9898\u3002HTTP\/3\uff08\u57fa\u4e8eQUIC\uff09\u901a\u8fc7UDP\u5b9e\u73b00-RTT\u4e0e\u66f4\u5feb\u7684\u8fde\u63a5\u5efa\u7acb\uff0c\u5728\u9ad8\u4e22\u5305\u7f51\u7edc\u6216\u957f\u8ddd\u79bb\u8def\u5f84\u4e0a\u80fd\u663e\u8457\u964d\u4f4e\u5ef6\u8fdf\u3002\u6b64\u5916\uff0c\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff08\u5982BBR vs 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