{"id":209667,"date":"2025-10-23T20:08:58","date_gmt":"2025-10-23T12:08:58","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209667\/"},"modified":"2025-10-23T20:08:59","modified_gmt":"2025-10-23T12:08:59","slug":"cdn-83","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209667\/","title":{"rendered":"CDN\u63d0\u901f\u4e0b\u8f7d\u4e2d\u5fc3\uff1a\u5b9e\u73b0\u6781\u901f\u7a33\u5b9a\u7684\u8d44\u6e90\u8bbf\u95ee"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u4ee5\u901f\u5ea6\u548c\u7a33\u5b9a\u6027\u4e3a\u738b\u7684\u4e92\u8054\u7f51\u73af\u5883\u4e2d\uff0c\u5982\u4f55\u8ba9\u7528\u6237\u4ee5\u6700\u5feb\u3001\u6700\u7a33\u5b9a\u7684\u65b9\u5f0f\u4e0b\u8f7d\u8d44\u6e90\uff0c\u662f\u6bcf\u4e2a\u7ad9\u957f\u3001\u4f01\u4e1a\u548c\u5f00\u53d1\u8005\u90fd\u5fc5\u987b\u9762\u5bf9\u7684\u95ee\u9898\u3002\u672c\u6587\u805a\u7126\u4e8e\u57fa\u4e8e\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff08CDN\uff09\u7684\u4e0b\u8f7d\u52a0\u901f\u5b9e\u8df5\uff0c\u6df1\u5165\u63a2\u8ba8\u5176\u539f\u7406\u3001\u90e8\u7f72\u7ec6\u8282\u4e0e\u4f18\u5316\u7b56\u7565\uff0c\u5e2e\u52a9\u4f60\u4e3a\u4e0d\u540c\u5730\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\u4e0a\u7684\u7528\u6237\u63d0\u4f9b\u9ad8\u8d28\u91cf\u7684\u4e0b\u8f7d\u4f53\u9a8c\uff0c\u540c\u65f6\u7ed9\u51fa\u9762\u5411\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u4ee5\u53ca\u6d77\u5916\u670d\u52a1\u5668\u73af\u5883\u7684\u9009\u8d2d\u4e0e\u67b6\u6784\u5efa\u8bae\u3002<\/p>\n<h2>CDN\u63d0\u901f\u7684\u6838\u5fc3\u539f\u7406<\/h2>\n<p>CDN\u7684\u6838\u5fc3\u662f\u5c06\u6e90\u7ad9\uff08Origin\uff09\u5185\u5bb9\u5206\u53d1\u5230\u904d\u5e03\u5168\u7403\u7684\u8fb9\u7f18\u8282\u70b9\uff08PoP\uff0cPoint of Presence\uff09\uff0c\u7528\u6237\u8bf7\u6c42\u547d\u4e2d\u5c31\u8fd1\u8282\u70b9\uff0c\u4ece\u800c\u51cf\u5c11\u4f20\u8f93\u65f6\u5ef6\u548c\u4e22\u5305\u7387\u3002\u5b9e\u73b0\u4e0b\u8f7d\u52a0\u901f\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u6280\u672f\u8981\u70b9\uff1a<\/p>\n<h3>\u8fb9\u7f18\u7f13\u5b58\u4e0e\u7f13\u5b58\u7b56\u7565<\/h3>\n<ul>\n<li>Origin Pull \u4e0e Origin Push\uff1a\u5e38\u7528\u7684\u662f <strong>Origin Pull\uff08\u6309\u9700\u56de\u6e90\uff09<\/strong>\uff0c\u8fb9\u7f18\u8282\u70b9\u5728\u9996\u6b21\u8bf7\u6c42\u65f6\u5411\u6e90\u7ad9\u62c9\u53d6\u6587\u4ef6\u5e76\u7f13\u5b58\uff1bOrigin Push \u5219\u9002\u7528\u4e8e\u9884\u5148\u4e0a\u4f20\u5927\u6587\u4ef6\u6216\u53d1\u5e03\u6587\u4ef6\u5305\u3002<\/li>\n<li>HTTP \u7f13\u5b58\u5934\uff08Cache-Control, Expires, ETag\uff09\uff1a\u5408\u7406\u8bbe\u7f6e <strong>Cache-Control: public, max-age<\/strong> \u53ef\u4ee5\u51cf\u5c0f\u56de\u6e90\u9891\u7387\u3002ETag \u4e0e If-None-Match \u7528\u4e8e\u6821\u9a8c\u8d44\u6e90\u4e00\u81f4\u6027\u3002<\/li>\n<li>\u5206\u7247\u4e0e\u8303\u56f4\u8bf7\u6c42\uff08Range Requests\uff09\uff1a\u5bf9\u4e8e\u5927\u6587\u4ef6\u4e0b\u8f7d\uff0c\u652f\u6301 HTTP Range \u80fd\u591f\u5b9e\u73b0\u65ad\u70b9\u7eed\u4f20\u548c\u5e76\u884c\u5206\u7247\u4e0b\u8f7d\uff0c\u4ece\u800c\u63d0\u9ad8\u541e\u5410\u91cf\u4e0e\u7528\u6237\u4f53\u9a8c\u3002<\/li>\n<\/ul>\n<h3>\u4f20\u8f93\u5c42\u4e0e\u534f\u8bae\u4f18\u5316<\/h3>\n<ul>\n<li>TCP \u53c2\u6570\u8c03\u4f18\uff1a\u5728\u8fb9\u7f18\u4e0e\u6e90\u7ad9\u4e4b\u95f4\u91c7\u7528\u66f4\u5927\u7684\u62e5\u585e\u7a97\u53e3\u3001\u542f\u7528 TCP Fast Open\u3001\u4f7f\u7528 BBR \u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u957f\u8ddd\u79bb\u4f20\u8f93\u6027\u80fd\u3002<\/li>\n<li>\u4fdd\u6301\u6d3b\u8dc3\u8fde\u63a5\uff08Keep-Alive\uff09\uff1a\u51cf\u5c11 TCP\/SSL \u63e1\u624b\u5f00\u9500\uff0c\u63d0\u5347\u6bcf\u79d2\u8bf7\u6c42\u5904\u7406\u80fd\u529b\u3002<\/li>\n<li>HTTP\/2 \u4e0e HTTP\/3\uff08QUIC\uff09\uff1aHTTP\/2 \u7684\u591a\u8def\u590d\u7528\u51cf\u5c11\u4e86\u8bf7\u6c42\u961f\u5934\u963b\u585e\uff0c\u800c HTTP\/3 \u57fa\u4e8e UDP \u7684 QUIC \u5728\u9ad8\u4e22\u5305\u7f51\u7edc\u4e2d\u5bf9\u4e0b\u8f7d\u5ef6\u8fdf\u66f4\u53cb\u597d\uff0c\u9002\u5408\u8de8\u592a\u5e73\u6d0b\u7684\u9999\u6e2f-\u7f8e\u7ebf\u8def\u3002<\/li>\n<li>TLS \u52a0\u901f\uff1a\u4f7f\u7528\u4f1a\u8bdd\u590d\u7528\uff08session resumption\uff09\u548c OCSP stapling\uff0c\u51cf\u5c11 HTTPS \u5efa\u7acb\u5ef6\u8fdf\uff1b\u5728\u8fb9\u7f18\u8282\u70b9\u542f\u7528 TLS \u7ec8\u7aef\u53ef\u4ee5\u964d\u4f4e\u6e90\u7ad9\u538b\u529b\u3002<\/li>\n<\/ul>\n<h3>\u8def\u7531\u4e0e\u6d41\u91cf\u8c03\u5ea6<\/h3>\n<ul>\n<li>\u667a\u80fd\u8c03\u5ea6 &amp; GSLB\uff08\u5168\u5c40\u670d\u52a1\u5668\u8d1f\u8f7d\u5747\u8861\uff09\uff1a\u6839\u636e\u5730\u7406\u4f4d\u7f6e\u3001\u7f51\u7edc\u8d28\u91cf\u4e0e\u8282\u70b9\u8d1f\u8f7d\u5c06\u7528\u6237\u5bfc\u5411\u6700\u4f18 PoP\uff0c\u8de8\u9999\u6e2f\u3001\u7f8e\u56fd\u548c\u4e9a\u592a\u8282\u70b9\u95f4\u7075\u6d3b\u5207\u6362\u3002<\/li>\n<li>\u94fe\u8def\u805a\u5408\u4e0e\u591a\u8def\u5f84\u4f20\u8f93\uff1a\u5bf9\u63a5\u591a\u4e2a\u4e0a\u6e38\u9aa8\u5e72 ISP\uff0c\u7ed3\u5408\u5b9e\u65f6\u94fe\u8def\u8d28\u91cf\u76d1\u63a7\u5b9e\u73b0\u65e0\u611f\u5207\u6362\uff0c\u63d0\u5347\u7a33\u5b9a\u6027\u3002<\/li>\n<\/ul>\n<h2>\u5178\u578b\u5e94\u7528\u573a\u666f\u4e0e\u5b9e\u73b0\u7ec6\u8282<\/h2>\n<p>\u4e0d\u540c\u7684\u4e0b\u8f7d\u573a\u666f\u5bf9 CDN \u7684\u9700\u6c42\u4e0d\u540c\uff0c\u4e0b\u9762\u5217\u4e3e\u5e38\u89c1\u573a\u666f\u5e76\u7ed9\u51fa\u5b9e\u73b0\u5efa\u8bae\u3002<\/p>\n<h3>\u8f6f\u4ef6\u5206\u53d1\u4e0e\u5927\u6587\u4ef6\u4e0b\u8f7d<\/h3>\n<ul>\n<li>\u4f7f\u7528\u5206\u7247\u5e76\u884c\u4e0b\u8f7d\uff08multipart download\uff09\u548c Range \u8bf7\u6c42\uff0c\u652f\u6301\u65ad\u70b9\u7eed\u4f20\uff1b\u5728\u5ba2\u6237\u7aef\u5b9e\u73b0 MD5\/sha \u6821\u9a8c\u4ee5\u4fdd\u8bc1\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u5bf9\u4e8e\u9891\u7e41\u66f4\u65b0\u7684\u8f6f\u4ef6\u5305\uff0c\u91c7\u7528\u7248\u672c\u5316\u7b56\u7565\uff08\u5728 URL \u4e2d\u5305\u542b\u7248\u672c\u53f7\u6216 hash\uff09\u914d\u5408\u957f\u7f13\u5b58\uff0c\u53ef\u51cf\u5c11\u8fb9\u7f18\u56de\u6e90\u5f00\u9500\u3002<\/li>\n<li>\u5bf9\u5927\u6587\u4ef6\u542f\u7528\u201c\u6d41\u5f0f\u56de\u6e90\u201d\u6216\u8fb9\u7f18\u76f4\u5199\uff08Edge Write\uff09\uff0c\u907f\u514d\u6e90\u7ad9 IO \u74f6\u9888\u3002<\/li>\n<\/ul>\n<h3>\u9759\u6001\u8d44\u6e90\u4e0e\u5a92\u4f53\u5206\u53d1<\/h3>\n<ul>\n<li>\u542f\u7528\u81ea\u52a8\u538b\u7f29\uff08Brotli\u3001Gzip\uff09\u4e0e\u56fe\u7247 WebP\/AVIF \u8f6c\u7801\uff0c\u51cf\u5c0f\u4f20\u8f93\u4f53\u79ef\u3002<\/li>\n<li>\u5bf9\u5927\u89c6\u9891\u6216\u955c\u50cf\u6587\u4ef6\uff0c\u8003\u8651\u4f7f\u7528\u5206\u6bb5 HLS\/DASH \u6216\u5bf9\u8c61\u5b58\u50a8 + CDN \u7ec4\u5408\uff0c\u4ee5\u4fbf\u5bf9\u4e0d\u540c\u5e26\u5bbd\u7528\u6237\u8fdb\u884c\u81ea\u9002\u5e94\u5206\u53d1\u3002<\/li>\n<\/ul>\n<h3>\u4f01\u4e1a\u5185\u90e8\u5206\u53d1\u4e0e\u6df7\u5408\u4e91\u573a\u666f<\/h3>\n<ul>\n<li>\u901a\u8fc7\u79c1\u6709 PoP \u6216\u4e13\u7ebf\u63a5\u5165\uff08\u6bd4\u5982\u5230\u9999\u6e2f\u670d\u52a1\u5668\u6216\u9999\u6e2fVPS\uff09\u5b9e\u73b0\u6570\u636e\u540c\u57ce\u5206\u53d1\uff0c\u4fdd\u8bc1\u5185\u90e8\u7528\u6237\u7684\u8d85\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<li>\u5728\u8de8\u5883\u4e1a\u52a1\u4e2d\uff0c\u7ed3\u5408\u6d77\u5916\u670d\u52a1\u5668\uff08\u5982\u7f8e\u56fd\u670d\u52a1\u5668\u3001\u65b0\u52a0\u5761\u670d\u52a1\u5668\u3001\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\uff09\u505a\u591a\u6d3b\u5907\u4efd\u548c\u5730\u57df\u5c31\u8fd1\u5206\u53d1\uff0c\u63d0\u5347\u5bb9\u707e\u80fd\u529b\u3002<\/li>\n<\/ul>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1a\u4f20\u7edf\u76f4\u8fde vs CDN \u52a0\u901f<\/h2>\n<p>\u9009\u62e9\u662f\u5426\u4f7f\u7528 CDN \u9700\u8981\u6743\u8861\u6210\u672c\u4e0e\u6536\u76ca\uff0c\u4ee5\u4e0b\u662f\u5173\u952e\u6bd4\u8f83\u7ef4\u5ea6\uff1a<\/p>\n<h3>\u6027\u80fd\u4e0e\u5ef6\u8fdf<\/h3>\n<ul>\n<li>\u76f4\u8fde\u6e90\u7ad9\uff1a\u5bf9\u8fd1\u8ddd\u79bb\u7528\u6237\uff08\u4f8b\u5982\u9999\u6e2f\u672c\u5730\u8bbf\u95ee\u9999\u6e2f\u670d\u52a1\u5668\uff09\u53ef\u80fd\u8db3\u591f\u5feb\uff0c\u4f46\u8de8\u56fd\u8bbf\u95ee\uff08\u4f8b\u5982\u8bbf\u95ee\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u5ef6\u8fdf\u9ad8\u4e14\u4e0d\u7a33\u5b9a\u3002<\/li>\n<li>CDN\uff1a\u901a\u8fc7\u5c31\u8fd1 PoP \u7f29\u77ed RTT\uff0c\u5c24\u5176\u5728\u4e9a\u6d32\u8282\u70b9\u8f83\u591a\u65f6\uff08\u9999\u6e2f\u3001\u65b0\u52a0\u5761\u3001\u65e5\u672c\u3001\u97e9\u56fd\uff09\u80fd\u663e\u8457\u51cf\u5c11\u4e0b\u8f7d\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<h3>\u7a33\u5b9a\u6027\u4e0e\u53ef\u7528\u6027<\/h3>\n<ul>\n<li>\u76f4\u8fde\u53d7\u5355\u70b9\u94fe\u8def\u5f71\u54cd\u66f4\u5927\uff1b\u800c CDN \u901a\u8fc7\u591a\u8282\u70b9\u3001\u94fe\u8def\u5197\u4f59\u548c\u667a\u80fd\u8def\u7531\u63d0\u5347\u53ef\u7528\u6027\u3002<\/li>\n<li>\u5bf9\u4e8e\u7a81\u53d1\u6d41\u91cf\uff08\u4f8b\u5982\u8425\u9500\u5927\u4fc3\u6216\u8f6f\u4ef6\u53d1\u5e03\uff09\uff0cCDN \u80fd\u5e73\u6ed1\u6d41\u91cf\u5e76\u4fdd\u62a4\u6e90\u7ad9\u4e0d\u88ab\u538b\u57ae\u3002<\/li>\n<\/ul>\n<h3>\u5b89\u5168\u4e0e\u5408\u89c4<\/h3>\n<ul>\n<li>CDN \u4e00\u822c\u96c6\u6210 WAF\u3001DDoS \u9632\u62a4\u548c\u901f\u7387\u9650\u5236\u7b56\u7565\uff0c\u80fd\u51cf\u8f7b\u6e90\u7ad9\u5b89\u5168\u538b\u529b\u3002<\/li>\n<li>\u9700\u8981\u6ce8\u610f\u6570\u636e\u5408\u89c4\u6027\uff0c\u90e8\u5206\u884c\u4e1a\u53ef\u80fd\u8981\u6c42\u6570\u636e\u9a7b\u7559\u5728\u7279\u5b9a\u56fd\u5bb6\u6216\u533a\u57df\uff0c\u9009\u62e9\u8282\u70b9\u65f6\u5e94\u8003\u8651\u6cd5\u5f8b\u4e0e\u5408\u89c4\u7ea6\u675f\u3002<\/li>\n<\/ul>\n<h2>\u9009\u8d2d\u4e0e\u90e8\u7f72\u5efa\u8bae<\/h2>\n<p>\u4e3a\u4e0d\u540c\u89c4\u6a21\u4e0e\u9700\u6c42\u7684\u7528\u6237\u7ed9\u51fa\u5b9e\u52a1\u5efa\u8bae\uff0c\u4fbf\u4e8e\u5728\u9999\u6e2f\u3001\u7f8e\u56fd\u6216\u5176\u4ed6\u6d77\u5916\u670d\u52a1\u5668\u73af\u5883\u4e0b\u505a\u51fa\u5408\u7406\u9009\u62e9\u3002<\/p>\n<h3>\u5982\u4f55\u9009\u62e9\u8282\u70b9\u4e0e\u670d\u52a1\u7c7b\u578b<\/h3>\n<ul>\n<li>\u9762\u5411\u9999\u6e2f\u53ca\u5468\u8fb9\u7528\u6237\uff1a\u4f18\u5148\u8003\u8651\u5728\u9999\u6e2f\u3001\u6df1\u5733\u3001\u4e1c\u4eac\u3001\u65b0\u52a0\u5761\u3001\u9996\u5c14\u6709 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