{"id":209939,"date":"2025-10-24T01:43:44","date_gmt":"2025-10-23T17:43:44","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209939\/"},"modified":"2025-10-24T01:43:45","modified_gmt":"2025-10-23T17:43:45","slug":"cdn-203","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209939\/","title":{"rendered":"CDN \u8fd0\u7ef4\u5fc5\u8bfb\uff1a7 \u5927\u5e38\u89c1\u6545\u969c\u3001\u6210\u56e0\u89e3\u6790\u4e0e\u5feb\u901f\u89e3\u51b3\u65b9\u6848"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u4e92\u8054\u7f51\u73af\u5883\u4e2d\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u5df2\u6210\u4e3a\u4fdd\u969c\u7f51\u7ad9\u6027\u80fd\u4e0e\u53ef\u7528\u6027\u7684\u6838\u5fc3\u7ec4\u4ef6\u3002\u65e0\u8bba\u662f\u4f7f\u7528\u9999\u6e2f\u670d\u52a1\u5668\u8fd8\u662f\u7f8e\u56fd\u670d\u52a1\u5668\uff0c\u6291\u6216\u90e8\u7f72\u5728\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u6216\u65b0\u52a0\u5761\u670d\u52a1\u5668\u7684\u5e94\u7528\uff0cCDN \u90fd\u80fd\u663e\u8457\u964d\u4f4e\u5ef6\u8fdf\u3001\u7f13\u89e3\u6e90\u7ad9\u538b\u529b\u3001\u63d0\u5347\u5e76\u53d1\u80fd\u529b\u3002\u7136\u800c\uff0cCDN \u8fd0\u7ef4\u5e76\u975e\u96f6\u6545\u969c\uff1a\u8282\u70b9\u6545\u969c\u3001\u7f13\u5b58\u6c61\u67d3\u3001\u56de\u6e90\u653e\u5927\u3001\u8bc1\u4e66\u5931\u6548\u7b49\u95ee\u9898\u4ecd\u9891\u7e41\u53d1\u751f\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\uff0c\u7ed3\u5408\u4e30\u5bcc\u6280\u672f\u7ec6\u8282\uff0c\u89e3\u67907 \u5927\u5e38\u89c1\u6545\u969c\u7684\u6210\u56e0\u4e0e\u5feb\u901f\u89e3\u51b3\u65b9\u6848\uff0c\u5e76\u7ed9\u51fa\u539f\u7406\u3001\u5e94\u7528\u573a\u666f\u3001\u4f18\u52bf\u5bf9\u6bd4\u4e0e\u9009\u8d2d\u5efa\u8bae\uff0c\u5e2e\u52a9\u4f60\u5728\u4f7f\u7528\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS \u6216\u6d77\u5916\u670d\u52a1\u5668\u65f6\u6784\u5efa\u66f4\u7a33\u5065\u7684\u5206\u53d1\u4f53\u7cfb\u3002<\/p>\n<h2>CDN \u57fa\u672c\u539f\u7406\u4e0e\u5173\u952e\u7ec4\u4ef6<\/h2>\n<p>\u5728\u6df1\u5165\u6545\u969c\u4e4b\u524d\uff0c\u5148\u56de\u987e CDN \u7684\u6838\u5fc3\u539f\u7406\u4ee5\u4fbf\u7406\u89e3\u6545\u969c\u94fe\u8def\u3002CDN \u901a\u8fc7\u5206\u5e03\u5728\u8fb9\u7f18\u7684\u7f13\u5b58\u8282\u70b9\uff08PoP\uff09\u5c06\u9759\u6001\u6216\u52a8\u6001\u5185\u5bb9\u7f13\u5b58\u5230\u79bb\u7528\u6237\u66f4\u8fd1\u7684\u4f4d\u7f6e\uff0c\u5e38\u89c1\u7ec4\u4ef6\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>DNS \u89e3\u6790\u5c42\uff08\u57fa\u4e8e\u5730\u57df\u6216\u5ef6\u8fdf\u505a\u8c03\u5ea6\uff09\uff1b<\/li>\n<li>\u8fb9\u7f18\u7f13\u5b58\u8282\u70b9\uff08\u7f13\u5b58\u7b56\u7565\u3001\u7f13\u5b58\u952e\u3001TTL\uff09\uff1b<\/li>\n<li>\u56de\u6e90\u673a\u5236\uff08\u56de\u6e90\u534f\u8bae\u3001\u56de\u6e90\u9650\u6d41\u3001\u5065\u5eb7\u68c0\u67e5\uff09\uff1b<\/li>\n<li>\u8d1f\u8f7d\u5747\u8861\u4e0e\u6d41\u91cf\u8c03\u5ea6\uff08\u5730\u7406\u3001\u7f51\u7edc\u8d28\u91cf\u3001\u8fd0\u8425\u5546\uff09\uff1b<\/li>\n<li>\u5b89\u5168\u5c42\uff08WAF\u3001DDoS \u9632\u62a4\u3001HTTPS\/\u8bc1\u4e66\u7ba1\u7406\uff09\u3002<\/li>\n<\/ul>\n<p>\u7406\u89e3\u8fd9\u4e9b\u7ec4\u4ef6\u80fd\u5e2e\u52a9\u5b9a\u4f4d\u95ee\u9898\u8303\u56f4\uff1a\u662f DNS\u3001\u8282\u70b9\u3001\u7f13\u5b58\u903b\u8f91\u3001\u56de\u6e90\u8fd8\u662f\u5b89\u5168\u7b56\u7565\uff1f\u540c\u65f6\uff0c\u5bf9\u8de8\u5883\u8bbf\u95ee\uff08\u4f8b\u5982\u4ece\u9999\u6e2f\u5230\u7f8e\u56fd\u6216\u65e5\u672c\u8bbf\u95ee\uff09\u5e94\u8003\u8651\u7f51\u7edc\u8def\u5f84\u4e0e\u8de8\u5883\u94fe\u8def\u6296\u52a8\u3002<\/p>\n<h2>\u5e38\u89c1\u6545\u969c\u4e00\u89c8\uff087 \u5927\u573a\u666f\uff09<\/h2>\n<p>\u4e0b\u9762\u5217\u51fa 7 \u79cd\u5e38\u89c1\u6545\u969c\uff0c\u6bcf\u9879\u5305\u542b\u6210\u56e0\u5206\u6790\u4e0e\u5feb\u901f\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<h3>1. DNS \u89e3\u6790\u5f02\u5e38\u5bfc\u81f4\u8bbf\u95ee\u5931\u8d25<\/h3>\n<p><strong>\u6210\u56e0\uff1a<\/strong>CDN \u901a\u5e38\u4f7f\u7528\u667a\u80fd DNS \u505a\u8282\u70b9\u8c03\u5ea6\uff0c\u82e5 DNS \u914d\u7f6e\u9519\u8bef\u3001TTL \u8fc7\u77ed\u6216\u6743\u5a01 DNS \u4e0d\u7a33\u5b9a\uff0c\u4f1a\u5bfc\u81f4\u7528\u6237\u89e3\u6790\u5230\u4e0d\u53ef\u7528\u8282\u70b9\u6216\u89e3\u6790\u5931\u8d25\u3002\u4f01\u4e1a\u57df\u540d\u6ce8\u518c\u65f6\u82e5\u66f4\u6362\u57df\u540d\u670d\u52a1\u5546\uff08\u5982\u505a\u57df\u540d\u6ce8\u518c\u8fc1\u79fb\uff09\u4e5f\u53ef\u80fd\u89e6\u53d1\u77ed\u65f6\u95f4\u89e3\u6790\u4e2d\u65ad\u3002<\/p>\n<p><strong>\u5feb\u901f\u89e3\u51b3\uff1a<\/strong><\/p>\n<ul>\n<li>\u68c0\u67e5\u6743\u5a01 DNS \u7684\u8bb0\u5f55\uff08A\/AAAA\/CNAME\uff09\u53ca TTL\uff0c\u4f7f\u7528 dig +trace \u5b9a\u4f4d\u95ee\u9898\uff1b<\/li>\n<li>\u77ed\u671f\u5185\u53ef\u5c06 TTL \u8c03\u9ad8\uff0c\u5e76\u5728 DNS \u89e3\u6790\u51fa\u73b0\u5f02\u5e38\u65f6\u56de\u6eda\u5230\u7a33\u5b9a\u8bb0\u5f55\uff1b<\/li>\n<li>\u914d\u7f6e\u591a\u5bb6\u6743\u5a01 DNS \u63d0\u9ad8\u53ef\u7528\u6027\uff1b<\/li>\n<li>\u5728\u8fc1\u79fb\u57df\u540d\u65f6\u91c7\u7528\u53cc\u5411\u89e3\u6790\u7b56\u7565\uff08\u65e7\u89e3\u6790\u4e0e\u65b0\u89e3\u6790\u5e76\u884c\uff09\u4ee5\u786e\u4fdd\u5e73\u6ed1\u5207\u6362\u3002<\/li>\n<\/ul>\n<h3>2. \u8fb9\u7f18\u8282\u70b9\u7f13\u5b58\u51fb\u7a7f\/\u7a7f\u900f\/\u96ea\u5d29<\/h3>\n<p><strong>\u6210\u56e0\uff1a<\/strong>\u5f53\u5927\u91cf\u8bf7\u6c42\u9488\u5bf9\u540c\u4e00\u672a\u7f13\u5b58\u6216\u5df2\u5931\u6548\u7684\u8d44\u6e90\u5e76\u53d1\u56de\u6e90\uff0c\u4f1a\u9020\u6210\u56de\u6e90\u538b\u529b\u6fc0\u589e\uff0c\u6e90\u7ad9 CPU\u3001\u6570\u636e\u5e93\u5d29\u6e83\uff0c\u5f62\u6210\u7f13\u5b58\u96ea\u5d29\u3002\u7f13\u5b58\u7a7f\u900f\u5219\u662f\u6076\u610f\u6216\u5f02\u5e38\u8bf7\u6c42\u5e26\u6709\u4e0d\u5b58\u5728\u7684 key\uff0c\u5bfc\u81f4\u6bcf\u6b21\u90fd\u56de\u6e90\u3002<\/p>\n<p><strong>\u5feb\u901f\u89e3\u51b3\uff1a<\/strong><\/p>\n<ul>\n<li>\u5f00\u542f\u4e92\u65a5\u9501\uff08cache-lock\uff09\u6216\u6392\u961f\u673a\u5236\uff0c\u907f\u514d\u5e76\u53d1\u56de\u6e90\uff1b<\/li>\n<li>\u5bf9\u70ed\u95e8\u8d44\u6e90\u8bbe\u7f6e\u5408\u7406\u7684 TTL \u4e0e\u9884\u70ed\u7b56\u7565\uff1b<\/li>\n<li>\u5bf9\u975e\u6cd5\u6216\u4e0d\u5b58\u5728\u7684 key \u8fd4\u56de 404 \u5e76\u8bbe\u7f6e\u77ed TTL\uff1b<\/li>\n<li>\u4f7f\u7528\u7194\u65ad\u7b56\u7565\u4e0e\u9650\u6d41\uff08\u5728 CDN \u5c42\u6216\u8fb9\u7f18\u811a\u672c\uff09\u4fdd\u62a4\u6e90\u7ad9\u3002<\/li>\n<\/ul>\n<h3>3. \u56de\u6e90\u5ef6\u8fdf\u4e0e\u8fde\u63a5\u8d85\u65f6<\/h3>\n<p><strong>\u6210\u56e0\uff1a<\/strong>\u8fb9\u7f18\u8282\u70b9\u4e0e\u6e90\u7ad9\u4e4b\u95f4\u7f51\u7edc\u8def\u5f84\u5dee\u5f02\u3001\u5e26\u5bbd\u74f6\u9888\u6216\u6e90\u7ad9\u8d44\u6e90\u4e0d\u8db3\uff08\u5982\u9999\u6e2fVPS \u5e26\u5bbd\u8017\u5c3d\uff09\u4f1a\u5bfc\u81f4\u56de\u6e90\u5ef6\u8fdf\u6216\u8d85\u65f6\u3002\u8de8\u56fd\u56de\u6e90\uff08\u4f8b\u5982\u4ece\u65b0\u52a0\u5761\u670d\u52a1\u5668\u56de\u6e90\u5230\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u66f4\u6613\u51fa\u73b0 RTT \u589e\u9ad8\u4e0e\u4e22\u5305\u3002<\/p>\n<p><strong>\u5feb\u901f\u89e3\u51b3\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f18\u5316\u6e90\u7ad9\u7f51\u7edc\uff08\u589e\u52a0\u51fa\u53e3\u5e26\u5bbd\u6216\u4f7f\u7528\u591a\u51fa\u53e3\u3001\u591a\u673a\u623f\u90e8\u7f72\uff09\uff1b<\/li>\n<li>\u5728 CDN \u4e0a\u914d\u7f6e\u66f4\u957f\u7684\u56de\u6e90\u8d85\u65f6\u6216\u5206\u7247\u56de\u6e90\u7b56\u7565\uff1b<\/li>\n<li>\u4f7f\u7528\u5c31\u8fd1\u56de\u6e90\u6216\u591a\u6e90\u56de\u6e90\u7b56\u7565\uff0c\u5c06\u7528\u6237\u8bf7\u6c42\u56de\u6e90\u5230\u79bb\u7528\u6237\u6700\u8fd1\u7684\u53ef\u7528\u6e90\u7ad9\uff1b<\/li>\n<li>\u76d1\u63a7 RTT\u3001\u4e22\u5305\u7387\u4e0e TCP \u63e1\u624b\u6210\u529f\u7387\uff0c\u5fc5\u8981\u65f6\u5728\u8fb9\u7f18\u6216\u6e90\u7ad9\u542f\u7528 TCP \u4f18\u5316\u6216 HTTP\/2\u3001QUIC\u3002<\/li>\n<\/ul>\n<h3>4. HTTPS \u8bc1\u4e66\u5931\u6548\u6216\u94fe\u8def\u9519\u8bef<\/h3>\n<p><strong>\u6210\u56e0\uff1a<\/strong>\u8bc1\u4e66\u8fc7\u671f\u3001\u8bc1\u4e66\u94fe\u4e0d\u5b8c\u6574\u3001SNI \u914d\u7f6e\u9519\u8bef\uff0c\u6216 CDN \u4e0e\u6e90\u7ad9\u4e4b\u95f4 HTTPS \u534f\u8bae\u4e0d\u5339\u914d\u4f1a\u5bfc\u81f4\u8bbf\u95ee\u88ab\u6d4f\u89c8\u5668\u62d2\u7edd\u3002\u5c24\u5176\u5728\u591a\u57df\u540d\uff08\u5305\u62ec\u5b50\u57df\uff09\u53ca\u4f7f\u7528\u901a\u914d\u7b26\u8bc1\u4e66\u65f6\u5bb9\u6613\u51fa\u9519\u3002<\/p>\n<p><strong>\u5feb\u901f\u89e3\u51b3\uff1a<\/strong><\/p>\n<ul>\n<li>\u5468\u671f\u6027\u68c0\u67e5\u8bc1\u4e66\u6709\u6548\u671f\u5e76\u542f\u7528\u81ea\u52a8\u7eed\u7b7e\uff08\u4f8b\u5982 ACME\uff09\uff1b<\/li>\n<li>\u786e\u4fdd\u8bc1\u4e66\u94fe\u5b8c\u6574\uff0c\u5e76\u5728 CDN \u4e0e\u6e90\u7ad9\u540c\u65f6\u90e8\u7f72\u6b63\u786e\u7684\u4e2d\u95f4\u8bc1\u4e66\uff1b<\/li>\n<li>\u6821\u9a8c SNI \u914d\u7f6e\uff0c\u786e\u4fdd\u8fb9\u7f18\u8282\u70b9\u5728\u56de\u6e90\u65f6\u53d1\u9001\u6b63\u786e\u7684\u4e3b\u673a\u540d\uff1b<\/li>\n<li>\u4f7f\u7528 TLS \u7248\u672c\u4e0e\u52a0\u5bc6\u5957\u4ef6\u534f\u5546\u7b56\u7565\uff0c\u517c\u5bb9\u4e3b\u6d41\u5ba2\u6237\u7aef\u3002<\/li>\n<\/ul>\n<h3>5. \u7f13\u5b58\u4e00\u81f4\u6027\u4e0e\u7f13\u5b58\u6c61\u67d3<\/h3>\n<p><strong>\u6210\u56e0\uff1a<\/strong>\u9519\u8bef\u7684\u7f13\u5b58\u952e\uff08\u5982\u672a\u533a\u5206 Cookie\u3001Query String\u3001Accept headers\uff09\u6216\u672a\u6b63\u786e\u8bbe\u7f6e 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