{"id":210017,"date":"2025-10-24T04:07:43","date_gmt":"2025-10-23T20:07:43","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210017\/"},"modified":"2025-10-24T04:07:44","modified_gmt":"2025-10-23T20:07:44","slug":"cdn-242","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210017\/","title":{"rendered":"CDN\u7f13\u5b58\u81ea\u52a8\u5316\u4f18\u5316\u5b9e\u6218\uff1a\u63d0\u5347\u547d\u4e2d\u7387\u3001\u964d\u672c\u4e0e\u52a0\u901f\u4ea4\u4ed8"},"content":{"rendered":"<p>\u5728\u9762\u5bf9\u5168\u7403\u8bbf\u95ee\u3001\u591a\u5730\u57df\u90e8\u7f72\u548c\u8d39\u7528\u63a7\u5236\u7684\u73b0\u5b9e\u9700\u6c42\u65f6\uff0cCDN \u5df2\u6210\u4e3a\u52a0\u901f\u4ea4\u4ed8\u3001\u964d\u4f4e\u5e26\u5bbd\u6210\u672c\u548c\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u7684\u6838\u5fc3\u7ec4\u4ef6\u3002\u672c\u6587\u805a\u7126\u4e8e\u201cCDN 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\u57fa\u672c\u4e0a\u5728\u8fb9\u7f18\u8282\u70b9\u4fdd\u5b58\u8d44\u6e90\u526f\u672c\u3002\u8bf7\u6c42\u5230\u8fbe\u8fb9\u7f18\u8282\u70b9\u65f6\uff0c\u82e5\u8d44\u6e90\u5b58\u5728\u4e14\u672a\u8fc7\u671f\u5219\u8fd4\u56de\uff08\u547d\u4e2d\uff09\uff0c\u5426\u5219\u56de\u6e90\u62c9\u53d6\u5e76\u7f13\u5b58\uff08\u672a\u547d\u4e2d\uff09\u3002\u4f18\u5316\u76ee\u6807\u56f4\u7ed5\u63d0\u9ad8\u547d\u4e2d\u7387\uff08cache hit ratio\uff09\u3001\u51cf\u5c11\u56de\u6e90\u8bf7\u6c42\uff08origin requests\uff09\u548c\u63a7\u5236\u7f13\u5b58\u8fc7\u671f\u7b56\u7565\uff08TTL\uff09\u3002<\/p>\n<h3>\u5173\u952e\u6307\u6807\uff08KPI\uff09<\/h3>\n<ul>\n<li>\u7f13\u5b58\u547d\u4e2d\u7387\uff08Cache Hit Ratio\uff09\u2014 \u547d\u4e2d\u7684\u8bf7\u6c42\u5360\u6bd4\u3002<\/li>\n<li>\u56de\u6e90\u9891\u7387\uff08Origin Requests per second\uff09\u2014 \u6e90\u7ad9\u538b\u529b\u76f4\u63a5\u53cd\u6620\u6210\u672c\u4e0e\u53ef\u7528\u6027\u3002<\/li>\n<li>\u5b57\u8282\u547d\u4e2d\u7387\uff08Byte Hit Ratio\uff09\u2014 \u6309\u6d41\u91cf\u8ba1\u7b97\u7684\u547d\u4e2d\u3002<\/li>\n<li>\u5e73\u5747\u54cd\u5e94\u65f6\u5ef6\uff08Latency\uff09\u4e0e\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09\u3002<\/li>\n<li>\u7f13\u5b58\u5931\u6548\uff08Cold Miss\uff09\u7387\u4e0e\u9884\u70ed\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2>\u81ea\u52a8\u5316\u4f18\u5316\u7b56\u7565\u4e0e\u6280\u672f\u7ec6\u8282<\/h2>\n<h3>\u7f13\u5b58\u952e\uff08Cache Key\uff09\u4e0e URL \u6807\u51c6\u5316<\/h3>\n<p>\u7f13\u5b58\u952e\u51b3\u5b9a\u4e86\u54ea\u4e9b\u8bf7\u6c42\u88ab\u89c6\u4e3a\u76f8\u540c\u8d44\u6e90\u3002\u5e38\u89c1\u7b56\u7565\u5305\u62ec\u53bb\u9664\u65e0\u610f\u4e49\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\u3001\u7edf\u4e00\u534f\u8bae\u4e0e\u57df\u540d\u3001\u5ffd\u7565\u8ddf\u8e2a\u53c2\u6570\uff08utm_*\uff09\u4ee5\u53ca\u5bf9\u5927\u5c0f\u5199\u3001\u659c\u6760\u8fdb\u884c\u89c4\u8303\u5316\u3002\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li>\u5728 CDN \u914d\u7f6e\u4e2d\u542f\u7528 Query String 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cache\uff09\u80fd\u964d\u4f4e\u56de\u6e90\u9891\u7387\uff1a\u4e00\u7ea7\u8fb9\u7f18\u8282\u70b9\u5feb\u54cd\u5e94\uff0c\u4e8c\u7ea7\u4e2d\u95f4\u8282\u70b9\u4f5c\u4e3a\u6e90\u7ad9\u4fdd\u62a4\u5c42\uff0c\u51cf\u5c11\u5230\u771f\u6b63\u539f\u70b9\u7684\u8bf7\u6c42\u3002<\/p>\n<h3>\u8fb9\u7f18\u8ba1\u7b97\u4e0e\u52a8\u6001\u5185\u5bb9\u5206\u79bb<\/h3>\n<p>\u5bf9\u52a8\u6001\u9875\u9762\u6216\u9700\u8981\u7528\u6237\u5dee\u5f02\u5316\u5448\u73b0\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u5c06\u4e0d\u6613\u7f13\u5b58\u7684\u90e8\u5206\u901a\u8fc7\u8fb9\u7f18\u8ba1\u7b97\u6e32\u67d3\uff08Edge Side Includes\u3001Edge Compute\uff09\uff0c\u800c\u628a\u53ef\u7f13\u5b58\u7684\u7247\u6bb5\u6216\u9759\u6001\u8d44\u6e90\u5355\u72ec\u7f13\u5b58\u3002\u8fd9\u6837\u65e2\u63d0\u9ad8\u547d\u4e2d\u7387\u53c8\u4fdd\u7559\u52a8\u6001\u80fd\u529b\u3002<\/p>\n<h3>\u81ea\u52a8\u5316\u7f13\u5b58\u66f4\u65b0\u4e0e\u65e0\u7f1d\u53d1\u5e03\uff08Cache Invalidation \/ Versioning\uff09<\/h3>\n<p>\u5e38\u89c1\u505a\u6cd5\uff1a<\/p>\n<ul>\n<li>\u8d44\u6e90\u7248\u672c\u5316\uff08hash \u6587\u4ef6\u540d\uff0c\u5982 app.ab12.css\uff09\u4ee5\u907f\u514d\u590d\u6742\u7684\u9010\u6761\u5931\u6548\uff1b<\/li>\n<li>\u4f7f\u7528 CDN \u7684 API \u81ea\u52a8\u5316\u6e05\u9664\uff08purge\uff09\u6216\u6279\u91cf\u5931\u6548\uff0c\u5e76\u4e0e CI\/CD \u96c6\u6210\uff0c\u786e\u4fdd\u53d1\u5e03\u65f6\u81ea\u52a8\u5237\u65b0\uff1b<\/li>\n<li>\u91c7\u7528 Cache-Control \u7684 surrogate-control \u5934\u4e0e Surrogate-Key\uff08\u4e00\u4e9b CDN \u652f\u6301\uff09\uff0c\u901a\u8fc7\u6807\u7b7e\u6279\u91cf\u6e05\u7406\u76f8\u5173\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<h3>\u9884\u70ed\uff08Cache Warming\uff09\u4e0e\u6309\u9700\u9884\u53d6<\/h3>\n<p>\u5bf9\u4e8e\u53d1\u5e03\u540e\u7684\u70ed\u95e8\u9875\u9762\u6216\u5927\u578b\u9759\u6001\u8d44\u6e90\uff0c\u4f7f\u7528\u81ea\u52a8\u5316\u811a\u672c\u5728\u540e\u53f0\u6309\u9700\u8bf7\u6c42\u4ee5\u586b\u5145\u8fb9\u7f18\u7f13\u5b58\uff0c\u6216\u501f\u52a9 CDN \u63d0\u4f9b\u7684\u9884\u70ed API\u3002\u7ed3\u5408\u8bbf\u95ee\u65e5\u5fd7\u548c\u673a\u5668\u5b66\u4e60\u9884\u6d4b\u70ed\u95e8\u8def\u5f84\uff0c\u53ef\u5b9e\u73b0\u667a\u80fd\u9884\u70ed\uff0c\u51cf\u5c11\u51b7\u542f\u52a8\u5bfc\u81f4\u7684\u672a\u547d\u4e2d\u3002<\/p>\n<h3>\u538b\u7f29\u3001\u4f20\u8f93\u4e0e\u534f\u8bae\u4f18\u5316<\/h3>\n<p>\u5f00\u542f Brotli\/ gzip \u538b\u7f29\uff0c\u5408\u7406\u8bbe\u7f6e Vary: Accept-Encoding\uff0c\u542f\u7528 HTTP\/2 \u6216 HTTP\/3\uff08QUIC\uff09\u4ee5\u53ca TCP \u4f18\u5316\uff0c\u80fd\u663e\u8457\u964d\u4f4e\u5e26\u5bbd\u5e76\u63d0\u5347\u4f20\u8f93\u6548\u7387\u3002\u5bf9\u56fe\u7247\u4f7f\u7528 WebP\/AVIF \u5e76\u5b9e\u73b0\u683c\u5f0f\u534f\u5546\u4e5f\u662f\u964d\u4f4e\u6210\u672c\u7684\u91cd\u8981\u624b\u6bb5\u3002<\/p>\n<h3>\u56de\u6e90\u4fdd\u62a4\uff08Origin Shield\uff09\u4e0e\u8d1f\u8f7d\u63a7\u5236<\/h3>\n<p>\u4f7f\u7528 Origin Shield \u6216\u7c7b\u4f3c\u673a\u5236\u8ba9\u533a\u57df\u6027\u4e2d\u7ee7\u8282\u70b9\u627f\u62c5\u7edd\u5927\u591a\u6570\u56de\u6e90\u8bf7\u6c42\uff1b\u540c\u65f6\u5b9e\u73b0\u901f\u7387\u9650\u5236\u4e0e\u7194\u65ad\u7b56\u7565\uff0c\u5f53\u6e90\u7ad9\u4e0d\u53ef\u7528\u65f6\u63d0\u4f9b stale-if-error \u7684\u964d\u7ea7\u7f13\u5b58\uff0c\u786e\u4fdd\u53ef\u7528\u6027\u5e76\u964d\u4f4e\u91cd\u590d\u62c9\u53d6\u5bf9\u6e90\u7ad9\u7684\u51b2\u51fb\u3002<\/p>\n<h3>\u76d1\u63a7\u3001\u6307\u6807\u4e0e\u81ea\u52a8\u51b3\u7b56<\/h3>\n<p>\u81ea\u52a8\u5316\u4f18\u5316\u79bb\u4e0d\u5f00\u5b9e\u65f6\u76d1\u63a7\u3002\u5173\u952e\u505a\u6cd5\uff1a<\/p>\n<ul>\n<li>\u6536\u96c6\u8fb9\u7f18\u547d\u4e2d\u3001\u56de\u6e90\u91cf\u3001\u5404\u5730\u533a\u5ef6\u8fdf\u53ca\u8d39\u7528\u6570\u636e\uff1b<\/li>\n<li>\u5229\u7528\u9608\u503c\u4e0e\u89c4\u5219\u5f15\u64ce\uff08\u5982 Prometheus + Alertmanager\uff09\u89e6\u53d1\u81ea\u52a8\u5316\u64cd\u4f5c\uff1a\u4f8b\u5982\u5f53\u56de\u6e90\u91cf\u5f02\u5e38\u65f6\u81ea\u52a8\u5ef6\u957f TTL\u3001\u89e6\u53d1\u9884\u70ed\u6216\u542f\u7528\u66f4\u4e25\u7684\u7f13\u5b58\u952e\u89c4\u5219\uff1b<\/li>\n<li>\u901a\u8fc7 A\/B 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\u662f\u9996\u9009\u3002\u91c7\u7528\u591a\u7ea7\u7f13\u5b58\u4e0e\u9884\u70ed\u53ef\u964d\u4f4e\u5e26\u5bbd\u6210\u672c\uff0c\u7279\u522b\u662f\u5f53\u6d41\u91cf\u96c6\u4e2d\u6765\u81ea\u9999\u6e2f\u3001\u4e1c\u5357\u4e9a\u6216\u7f8e\u6d32\u65f6\uff0c\u7ed3\u5408\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u4e0e\u65b0\u52a0\u5761\u670d\u52a1\u5668\u7684\u8282\u70b9\u90e8\u7f72\u80fd\u663e\u8457\u6539\u5584\u4f53\u9a8c\u3002<\/p>\n<h3>\u7535\u5546\u4e0e\u9891\u7e41\u53d1\u5e03\u573a\u666f<\/h3>\n<p>\u7535\u5546\u7ad9\u70b9\u53d1\u5e03\u9891\u7e41\u4f46\u53c8\u9700\u8981\u786e\u4fdd\u9875\u9762\u5feb\u901f\u66f4\u65b0\u3002\u63a8\u8350\u4f7f\u7528\u8d44\u6e90\u7248\u672c\u5316\u3001Surrogate-Key \u6807\u7b7e\u4ee5\u53ca\u4e0e CI\/CD \u96c6\u6210\u7684\u81ea\u52a8\u5316\u6e05\u7406\u7b56\u7565\u3002\u5bf9\u7ed3\u8d26\u7b49\u5173\u952e\u8def\u7531\u91c7\u7528\u77ed TTL \u6216\u65e0\u7f13\u5b58\u3001\u5bf9\u5546\u54c1\u8be6\u60c5\u7b49\u91c7\u7528\u957f TTL \u5e76\u7ed3\u5408\u8fb9\u7f18\u6e32\u67d3\u3002<\/p>\n<h3>API \u4e0e\u4e2a\u6027\u5316\u5185\u5bb9<\/h3>\n<p>\u5bf9 API \u4f7f\u7528 Cache-Control: public, s-maxage\uff0c\u7ed3\u5408 token-based cache key\uff08\u53bb\u6389 Authorization \u4e2d\u7684\u4e0d\u53ef\u7f13\u5b58\u90e8\u5206\uff09\uff0c\u5e76\u4e3a\u9ad8\u9891\u4f4e\u53d8\u7684\u63a5\u53e3\u8bbe\u7f6e\u8fb9\u7f18\u7f13\u5b58\uff0c\u5fc5\u8981\u65f6\u5728\u8fb9\u7f18\u505a\u7528\u6237\u4fe1\u606f\u8865\u507f\u4ee5\u652f\u6301\u4e2a\u6027\u5316\u3002<\/p>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\u4e0e\u9009\u8d2d\u5efa\u8bae<\/h2>\n<h3>\u81ea\u5efa\u7f13\u5b58 vs \u7b2c\u4e09\u65b9 CDN<\/h3>\n<p>\u81ea\u5efa\uff08\u5982\u5728\u9999\u6e2fVPS\/\u7f8e\u56fdVPS \u4e0a\u642d\u5efa\u53cd\u5411\u7f13\u5b58\uff09\u7075\u6d3b\u4f46\u7ef4\u62a4\u6210\u672c\u9ad8\uff0c\u4e0d\u6613\u8986\u76d6\u5168\u7403\u8282\u70b9\u3002\u7b2c\u4e09\u65b9 CDN \u6210\u672c\u53ef\u63a7\u4e14\u6253\u70b9\u7cbe\u7ec6\uff08HTTP\/2\/3\u3001\u8fb9\u7f18\u8ba1\u7b97\u3001\u81ea\u52a8\u5316 API\uff09\uff0c\u66f4\u9002\u5408\u9700\u8981\u5168\u7403\u52a0\u901f\u7684\u573a\u666f\u3002\u5bf9\u4e8e\u9884\u7b97\u654f\u611f\u6216\u533a\u57df\u6027\u5f3a\uff08\u4f8b\u5982\u4e3b\u8981\u7528\u6237\u5728\u9999\u6e2f\/\u65e5\u672c\/\u97e9\u56fd\uff09\u7684\u7ad9\u70b9\uff0c\u53ef\u91c7\u7528\u6df7\u5408\u7b56\u7565\uff1a\u5728\u5173\u952e\u533a\u57df\u4f7f\u7528\u672c\u5730\u9999\u6e2f\u670d\u52a1\u5668\u4e0e\u65b0\u52a0\u5761\u670d\u52a1\u5668\u4f5c\u4e3a\u8fd1\u6e90\u52a0\u901f\uff0c\u5168\u7403\u6d41\u91cf\u7531\u7b2c\u4e09\u65b9 CDN \u8fb9\u7f18\u627f\u62c5\u3002<\/p>\n<h3>\u5982\u4f55\u9009\u62e9 CDN \u7279\u6027<\/h3>\n<ul>\n<li>\u662f\u5426\u652f\u6301\u6309\u9700\u8fb9\u7f18\u8ba1\u7b97\uff08Lambda@Edge\u3001Workers\uff09\uff1b<\/li>\n<li>\u662f\u5426\u63d0\u4f9b\u5f3a\u5927\u7684 purge API\u3001surrogate-key \u4e0e tiered 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