{"id":209495,"date":"2025-10-23T15:52:42","date_gmt":"2025-10-23T07:52:42","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209495\/"},"modified":"2025-10-23T15:52:43","modified_gmt":"2025-10-23T07:52:43","slug":"cdn-9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209495\/","title":{"rendered":"CDN\u6570\u636e\u4f20\u8f93\u5168\u6d41\u7a0b\u8be6\u89e3\uff1a\u4ece\u7528\u6237\u8bf7\u6c42\u5230\u8fb9\u7f18\u4ea4\u4ed8"},"content":{"rendered":"<p>\u5728\u5168\u7403\u5316\u4e92\u8054\u7f51\u73af\u5883\u4e2d\uff0c\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff08CDN\uff09\u5df2\u7ecf\u6210\u4e3a\u63d0\u5347\u7f51\u7ad9\u6027\u80fd\u3001\u7a33\u5b9a\u6027\u4e0e\u5b89\u5168\u6027\u7684\u6838\u5fc3\u6280\u672f\u8def\u5f84\u3002\u672c\u6587\u5c06\u4ece\u6280\u672f\u7ec6\u8282\u5c42\u9762\uff0c\u7cfb\u7edf\u5256\u6790\u4e00\u6b21CDN\u6570\u636e\u4f20\u8f93\u7684\u5168\u6d41\u7a0b\uff1a\u4ece\u7528\u6237\u53d1\u8d77\u8bf7\u6c42\uff0c\u5230\u8fb9\u7f18\u8282\u70b9\u4ea4\u4ed8\u5185\u5bb9\uff0c\u6df1\u5165\u63a2\u8ba8DNS\u89e3\u6790\u3001\u8def\u7531\u8c03\u5ea6\u3001\u7f13\u5b58\u7b56\u7565\u3001\u534f\u8bae\u4f18\u5316\u4e0e\u56de\u6e90\u673a\u5236\u7b49\u5173\u952e\u73af\u8282\uff0c\u5e76\u7ed3\u5408\u4e0d\u540c\u5730\u57df\uff08\u4f8b\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\uff09\u90e8\u7f72\u65f6\u7684\u9009\u578b\u5efa\u8bae\uff0c\u5e2e\u52a9\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u548c\u5f00\u53d1\u8005\u66f4\u597d\u5730\u7406\u89e3\u4e0e\u5e94\u7528CDN\u3002<\/p>\n<h2>\u5f15\u8a00\uff1a\u4e3a\u4ec0\u4e48\u8981\u7406\u89e3CDN\u5168\u6d41\u7a0b<\/h2>\n<p>\u5bf9\u4e8e\u6d41\u91cf\u654f\u611f\u578b\u670d\u52a1\u4e0e\u5168\u7403\u7528\u6237\u7fa4\u7684\u7f51\u7ad9\u800c\u8a00\uff0cCDN\u4e0d\u4ec5\u662f\u201c\u628a\u5185\u5bb9\u653e\u5230\u79bb\u7528\u6237\u66f4\u8fd1\u201d\u7684\u7b80\u5355\u65b9\u6848\uff0c\u66f4\u662f\u4e00\u4e2a\u6db5\u76d6\u7f51\u7edc\u5c42\u3001\u4f20\u8f93\u5c42\u4e0e\u5e94\u7528\u5c42\u4f18\u5316\u7684\u590d\u6742\u7cfb\u7edf\u3002\u6df1\u5165\u7406\u89e3\u6570\u636e\u5728CDN\u5185\u90e8\u7684\u6d41\u8f6c\uff0c\u6709\u52a9\u4e8e\u4f18\u5316\u9875\u9762\u52a0\u8f7d\u65f6\u95f4\u3001\u964d\u4f4e\u56de\u6e90\u538b\u529b\u3001\u63d0\u5347\u53ef\u9760\u6027\u4e0e\u5b89\u5168\u6027\uff0c\u4e5f\u4fbf\u4e8e\u5728\u9009\u62e9\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u6216\u6d77\u5916\u670d\u52a1\u5668\u7b49\u57fa\u7840\u8bbe\u65bd\u65f6\u505a\u51fa\u5408\u7406\u90e8\u7f72\u3002<\/p>\n<h2>\u4ece\u7528\u6237\u8bf7\u6c42\u5230\u8fb9\u7f18\u4ea4\u4ed8\uff1a\u6838\u5fc3\u73af\u8282\u8be6\u89e3<\/h2>\n<h3>1. DNS\u89e3\u6790\u4e0e\u6d41\u91cf\u5f15\u5bfc<\/h3>\n<p>CDN\u6d41\u7a0b\u901a\u5e38\u4ece\u57df\u540d\u89e3\u6790\u5f00\u59cb\u3002\u7528\u6237\u5728\u6d4f\u89c8\u5668\u8bbf\u95ee\u57df\u540d\uff08\u4f8b\u5982 example.com\uff09\u65f6\uff0c\u9996\u5148\u89e6\u53d1DNS\u89e3\u6790\u3002CDN\u63d0\u4f9b\u5546\u901a\u8fc7\u5728DNS\u8bb0\u5f55\u4e2d\u914d\u7f6eCNAME\u6216\u4f7f\u7528\u6743\u5a01DNS\u670d\u52a1\uff0c\u5c06\u57df\u540d\u89e3\u6790\u5230CDN\u7684\u4efb\u610fAnycast IP\u6216\u6700\u8fd1\u7684POP\uff08Point of Presence\uff09\u4e0a\u3002<\/p>\n<ul>\n<li><strong>\u57fa\u4e8e\u5730\u7406\u6216\u5ef6\u8fdf\u7684\u8c03\u5ea6\uff1a<\/strong>DNS\u89e3\u6790\u8fd4\u56de\u7684IP\u7531\u8c03\u5ea6\u7cfb\u7edf\u51b3\u5b9a\uff0c\u7efc\u5408\u8003\u8651\u7528\u6237\u6e90IP\u7684\u5730\u7406\u4f4d\u7f6e\u3001\u7f51\u7edc\u5ef6\u8fdf\u3001POP\u8d1f\u8f7d\u4e0e\u94fe\u8def\u5065\u5eb7\u7b49\u6307\u6807\u3002<\/li>\n<li><strong>\u5168\u7403\u6d41\u91cf\u7ba1\u7406\uff08GSLB\uff09\uff1a<\/strong>\u591a\u6570\u636e\u4e2d\u5fc3\u90e8\u7f72\u65f6\uff0cGSLB\u7ed3\u5408\u5b9e\u65f6\u7f51\u7edc\u6d4b\u91cf\u5b9e\u73b0\u667a\u80fd\u6d41\u91cf\u5206\u914d\uff0c\u9002\u7528\u4e8e\u540c\u65f6\u90e8\u7f72\u9999\u6e2f\u670d\u52a1\u5668\u4e0e\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<h3>2. \u5efa\u7acb\u8fde\u63a5\uff1a\u4f20\u8f93\u5c42\u4e0e\u5b89\u5168\u63e1\u624b<\/h3>\n<p>\u89e3\u6790\u5230\u8fb9\u7f18\u8282\u70b9\u540e\uff0c\u5ba2\u6237\u7aef\u4e0e\u8be5\u8282\u70b9\u5efa\u7acbTCP\u8fde\u63a5\uff0c\u5e76\u5728\u9700\u8981\u65f6\u8fdb\u884cTLS\u63e1\u624b\u3002\u73b0\u4ee3CDN\u901a\u5e38\u652f\u6301HTTP\/1.1\u3001HTTP\/2\u3001HTTP\/3\uff08\u57fa\u4e8eQUIC\uff09\u7b49\u534f\u8bae\uff0c\u4ee5\u53caTLS 1.2\/1.3\u3002<\/p>\n<ul>\n<li><strong>TCP\u4f18\u5316\uff1a<\/strong>\u5305\u62ec\u62e5\u585e\u63a7\u5236\uff08CUBIC\u3001BBR\uff09\u3001\u5feb\u901f\u6253\u5f00\uff08TCP Fast Open\uff09\u7b49\uff0c\u51cf\u5c11\u63e1\u624b\u4e0e\u6162\u542f\u52a8\u5e26\u6765\u7684\u5ef6\u8fdf\u3002<\/li>\n<li><strong>TLS\u5378\u8f7d\u4e0e\u4f1a\u8bdd\u590d\u7528\uff1a<\/strong>\u8fb9\u7f18\u8282\u70b9\u627f\u62c5TLS\u7ec8\u6b62\uff0c\u51cf\u8f7b\u6e90\u7ad9\u8d1f\u62c5\uff1b\u542f\u7528\u4f1a\u8bdd\u7968\u636e\uff08Session Tickets\uff09\u4e0e0-RTT\uff08\u5728TLS1.3\u4e0b\uff09\u53ef\u663e\u8457\u7f29\u77ed\u63e1\u624b\u8017\u65f6\u3002<\/li>\n<li><strong>HTTP\/3\u4e0eQUIC\uff1a<\/strong>\u5728\u4e22\u5305\u73af\u5883\u4e0b\u5177\u5907\u66f4\u597d\u8868\u73b0\uff0c\u9002\u5408\u79fb\u52a8\u7528\u6237\u4e0e\u8de8\u56fd\u94fe\u8def\uff0c\u90e8\u7f72\u6d77\u5916\u670d\u52a1\u5668\uff08\u5982\u7f8e\u56fd\u6216\u65e5\u672c\uff09\u65f6\u4f18\u52bf\u660e\u663e\u3002<\/li>\n<\/ul>\n<h3>3. \u8bf7\u6c42\u5904\u7406\uff1a\u7f13\u5b58\u547d\u4e2d\u4e0e\u56de\u6e90\u51b3\u7b56<\/h3>\n<p>\u8fb9\u7f18\u8282\u70b9\u63a5\u6536\u8bf7\u6c42\u540e\uff0c\u9996\u5148\u68c0\u67e5\u672c\u5730\u7f13\u5b58\u662f\u5426\u6709\u53ef\u7528\u54cd\u5e94\uff08Cache Key \u5305\u62ecURL\u3001Query\u3001Headers\u7b49\uff09\u3002<\/p>\n<ul>\n<li><strong>Cache Hit\uff1a<\/strong>\u82e5\u547d\u4e2d\uff0c\u5219\u76f4\u63a5\u4ece\u8fb9\u7f18\u8fd4\u56de\u5185\u5bb9\uff0c\u6781\u5927\u5730\u51cf\u5c11\u5ef6\u8fdf\u4e0e\u56de\u6e90\u6d41\u91cf\u3002<\/li>\n<li><strong>Cache Miss \/ Stale\uff1a<\/strong>\u82e5\u672a\u547d\u4e2d\u6216\u7f13\u5b58\u8fc7\u671f\uff0c\u8fb9\u7f18\u5411\u4e0a\u6e38\u7f13\u5b58\u6216\u6e90\u7ad9\u56de\u6e90\u8bf7\u6c42\u3002\u5e38\u89c1\u4f18\u5316\u5305\u62ec\uff1a<\/li>\n<\/ul>\n<ul>\n<li>\u5206\u5c42\u7f13\u5b58\uff08Hierarchical Caching\uff09\uff1a\u533a\u57df\u6027\u4e2d\u95f4\u7f13\u5b58\u51cf\u5c11\u6e90\u7ad9\u538b\u529b\u3002<\/li>\n<li>\u8bf7\u6c42\u5408\u5e76\uff08Request Coalescing\uff09\uff1a\u5f53\u591a\u4e2a\u76f8\u540c\u8bf7\u6c42\u5e76\u53d1\u5230\u8fbe\u65f6\uff0c\u5408\u5e76\u4e3a\u4e00\u4e2a\u56de\u6e90\u8bf7\u6c42\uff0c\u9632\u6b62\u7f13\u5b58\u7a7f\u900f\u51b2\u51fb\u6e90\u7ad9\u3002<\/li>\n<li>\u7f13\u5b58\u9884\u53d6\uff08Prefetch\uff09\u4e0e\u4e3b\u52a8\u5237\u65b0\uff08Purge\/Preload\uff09\uff1a\u5bf9\u4e8e\u9ad8\u4ef7\u503c\u8d44\u6e90\uff0c\u53ef\u63d0\u524d\u9884\u70ed\u8fb9\u7f18\u7f13\u5b58\u3002<\/li>\n<\/ul>\n<h3>4. 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