{"id":210011,"date":"2025-10-24T04:02:35","date_gmt":"2025-10-23T20:02:35","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210011\/"},"modified":"2025-10-24T04:02:36","modified_gmt":"2025-10-23T20:02:36","slug":"cdn-239","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210011\/","title":{"rendered":"CDN\u6027\u80fd\u74f6\u9888\u6392\u67e5\u5b9e\u7528\u65b9\u6cd5\uff1a5\u6b65\u5feb\u901f\u5b9a\u4f4d\u4e0e\u4fee\u590d"},"content":{"rendered":"<p>\u5728\u5168\u7403\u5316\u8bbf\u95ee\u4e0e\u79fb\u52a8\u7f51\u7edc\u591a\u6837\u5316\u7684\u4eca\u5929\uff0cCDN \u5df2\u6210\u4e3a\u63d0\u9ad8\u7f51\u7ad9\u8bbf\u95ee\u901f\u5ea6\u4e0e\u7a33\u5b9a\u6027\u7684\u6838\u5fc3\u7ec4\u4ef6\u3002\u7136\u800c\uff0cCDN \u672c\u8eab\u5e76\u975e\u4e07\u80fd\uff0c\u6027\u80fd\u74f6\u9888\u5e38\u6765\u81ea\u591a\u79cd\u56e0\u7d20\uff1a\u7f13\u5b58\u7b56\u7565\u9519\u8bef\u3001\u6e90\u7ad9\u6027\u80fd\u4e0d\u8db3\u3001\u7f51\u7edc\u4e22\u5305\u3001DNS \u89e3\u6790\u6162\u3001TLS \u63e1\u624b\u5ef6\u8fdf\u7b49\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\uff0c\u63d0\u4f9b\u4e00\u5957\u5b9e\u7528\u7684\u4e94\u6b65\u6392\u67e5\u65b9\u6cd5\uff0c\u5e2e\u52a9\u4f60\u5feb\u901f\u5b9a\u4f4d\u5e76\u4fee\u590d CDN \u6027\u80fd\u95ee\u9898\uff0c\u5e76\u7a7f\u63d2\u5177\u4f53\u547d\u4ee4\u3001\u65e5\u5fd7\u5206\u6790\u4e0e\u4f18\u5316\u5efa\u8bae\uff0c\u9002\u7528\u4e8e\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u4ee5\u53ca\u5404\u7c7b\u6d77\u5916\u670d\u52a1\u5668\u573a\u666f\u3002<\/p>\n<h2>\u5f15\u8a00\uff1a\u4e3a\u4f55\u9700\u8981\u7cfb\u7edf\u5316\u6392\u67e5\u6d41\u7a0b<\/h2>\n<p>\u9047\u5230\u9875\u9762\u52a0\u8f7d\u6162\u6216\u7528\u6237\u62b1\u6028\u8de8\u5883\u8bbf\u95ee\u5ef6\u8fdf\u65f6\uff0c\u5355\u9760\u76f4\u89c9\u5f88\u96be\u5224\u65ad\u74f6\u9888\u4f4d\u7f6e\u3002\u4e00\u4e2a\u7cfb\u7edf\u5316\u7684\u6b65\u9aa4\u80fd\u628a\u590d\u6742\u95ee\u9898\u62c6\u89e3\u4e3a\u53ef\u5ea6\u91cf\u7684\u5b50\u9879\uff0c\u907f\u514d\u76f2\u76ee\u8c03\u6574\u5e26\u6765\u66f4\u5927\u6027\u80fd\u6ce2\u52a8\u3002\u672c\u6307\u5357\u5c06\u4ee5\u201c\u4e94\u6b65\u6cd5\u201d\u4f5c\u4e3a\u4e3b\u7ebf\uff0c\u5305\u542b\u68c0\u6d4b\u3001\u9694\u79bb\u3001\u8bca\u65ad\u3001\u4fee\u590d\u4e0e\u9a8c\u8bc1\uff0c\u517c\u987e TCP\/HTTP\/TLS \u5c42\u9762\u4e0e CDN \u7f13\u5b58\u7b56\u7565\u3002<\/p>\n<h2>\u6b65\u9aa4\u4e00\uff1a\u786e\u8ba4\u4e0e\u91cf\u5316\u95ee\u9898\uff08\u76d1\u6d4b\u4e0e\u6307\u6807\uff09<\/h2>\n<p>\u7b2c\u4e00\u6b65\u662f\u7528\u6570\u636e\u8bf4\u8bdd\u3002\u5e38\u7528\u7684\u5173\u952e\u6307\u6807\u5305\u62ec\uff1aTTFB\uff08Time To First Byte\uff09\u3001\u9996\u5c4f\u65f6\u95f4\u3001\u5b8c\u6574\u52a0\u8f7d\u65f6\u95f4\u3001\u8bf7\u6c42\u5931\u8d25\u7387\uff084xx\/5xx\uff09\u3001\u7f13\u5b58\u547d\u4e2d\u7387\u3001\u5e26\u5bbd\u5229\u7528\u7387\u4e0e\u4e22\u5305\u7387\u3002<\/p>\n<ul>\n<li>\u4f7f\u7528\u6d4f\u89c8\u5668\u5f00\u53d1\u8005\u5de5\u5177\uff08Network \u9762\u677f\uff09\u6216 Lighthouse \u83b7\u53d6\u9875\u9762\u52a0\u8f7d\u65f6\u95f4\u5206\u89e3\u3002<\/li>\n<li>\u7528\u547d\u4ee4\u884c\u5de5\u5177\u6279\u91cf\u6d4b\u8bd5\u4e0d\u540c\u5730\u533a\u5ef6\u8fdf\uff1aping\u3001traceroute\/tracert\u3001mtr\uff08Unix\uff09\u53ef\u89c2\u5bdf\u8def\u5f84\u4e0e\u4e22\u5305\u3002<\/li>\n<li>HTTP \u5c42\u9762\u7528 curl \u6279\u91cf\u91c7\u6837\u5e76\u6253\u5370\u54cd\u5e94\u5934\uff0c\u793a\u4f8b\u547d\u4ee4\uff1a\n<pre>curl -I -w \"@curl-format.txt\" -o \/dev\/null https:\/\/example.com<\/pre>\n<p>  \uff08curl-format.txt \u53ef\u5305\u542b\uff1atime_namelookup\u3001time_connect\u3001time_appconnect\u3001time_starttransfer\u3001time_total\uff09<\/li>\n<li>\u501f\u52a9\u5408\u6210\u76d1\u63a7\u4e0e\u771f\u5b9e\u7528\u6237\u76d1\u63a7\uff08RUM\uff09\uff0c\u4f8b\u5982\u8bbe\u7f6e\u4ece\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u65e5\u672c\u3001\u97e9\u56fd\u548c\u65b0\u52a0\u5761\u7684\u63a2\u9488\uff0c\u6bd4\u8f83\u5404\u5730 TTFB \u4e0e\u7f13\u5b58\u547d\u4e2d\u7387\u3002<\/li>\n<\/ul>\n<p><strong>\u5224\u65ad\u9608\u503c<\/strong>\uff1a\u4e00\u822c TTFB &lt; 200ms \u5c5e\u4e8e\u4f18\u79c0\uff0c200-500ms \u9700\u5173\u6ce8\uff0c\u8d85\u8fc7 500ms \u5219\u8bf4\u660e\u5b58\u5728\u660e\u663e\u95ee\u9898\u3002\u7f13\u5b58\u547d\u4e2d\u7387\u5e94\u5c3d\u91cf\u9ad8\u4e8e 80%\uff0c\u5426\u5219\u5927\u91cf\u56de\u6e90\u4f1a\u62d6\u6162\u54cd\u5e94\u3002<\/p>\n<h2>\u6b65\u9aa4\u4e8c\uff1a\u5feb\u901f\u9694\u79bb\u95ee\u9898\u57df\uff08CDN \u8282\u70b9 vs \u6e90\u7ad9 vs \u7f51\u7edc\uff09<\/h2>\n<p>\u660e\u786e\u662f CDN \u8282\u70b9\u5904\u7406\u6162\u3001\u8282\u70b9\u5230\u6e90\u7ad9\u7684\u56de\u6e90\u6162\uff0c\u8fd8\u662f\u7528\u6237\u5230 CDN \u7684\u7f51\u7edc\u95ee\u9898\u3002\u5e38\u7528\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>\u5728\u4e0d\u540c PoP\uff08Point of Presence\uff09\u8fdb\u884c\u5bf9\u6bd4\u6d4b\u8bd5\uff1a\u5229\u7528 CDN \u63d0\u4f9b\u7684\u5de5\u5177\u6216\u6d77\u5916 VPS\uff08\u5982\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\uff09\u767b\u5f55\u4e0d\u540c\u533a\u57df\u8fdb\u884c curl\/mtr \u6d4b\u8bd5\u3002<\/li>\n<li>\u5f3a\u5236\u7ed5\u8fc7 CDN \u76f4\u63a5\u8bbf\u95ee\u6e90\u7ad9\uff08\u4fee\u6539\u672c\u5730 hosts \u6307\u5411\u6e90\u7ad9 IP \u6216\u4e34\u65f6\u7981\u7528 CDN \u7684 CNAME\uff09\uff0c\u6bd4\u8f83 TTFB \u4e0e\u54cd\u5e94\u5185\u5bb9\u4ee5\u5224\u65ad\u662f\u5426\u4e3a\u56de\u6e90\u74f6\u9888\u3002<\/li>\n<li>\u68c0\u67e5 CDN \u4eea\u8868\u76d8\u4e0e\u65e5\u5fd7\uff0c\u5173\u6ce8 Edge errors\uff085xx\uff09\u3001\u56de\u6e90\u9519\u8bef\u3001\u56de\u6e90\u5ef6\u8fdf\u5206\u5e03\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff1a\u82e5\u5728\u9999\u6e2fVPS \u4e0a\u8bbf\u95ee CDN Edge \u5ef6\u8fdf\u6b63\u5e38\u4f46\u5728\u7f8e\u56fdVPS \u4e0a\u660e\u663e\u53d8\u9ad8\uff0c\u95ee\u9898\u53ef\u80fd\u5728\u8de8\u6d0b\u94fe\u8def\u6216\u7279\u5b9a PoP\u3002\u82e5\u7ed5\u8fc7 CDN \u8bbf\u95ee\u6e90\u7ad9\u65f6\u54cd\u5e94\u65f6\u95f4\u66f4\u957f\uff0c\u8bf4\u660e\u53ef\u80fd\u662f\u6e90\u7ad9\u6027\u80fd\u6216\u5e26\u5bbd\u74f6\u9888\u3002<\/p>\n<h2>\u6b65\u9aa4\u4e09\uff1a\u7f51\u7edc\u4e0e DNS \u6df1\u5165\u5206\u6790<\/h2>\n<p>\u7f51\u7edc\u8def\u5f84\u4e0e DNS \u89e3\u6790\u662f CDN \u6027\u80fd\u5e38\u89c1\u9690\u60a3\uff0c\u5c24\u5176\u662f\u5168\u7403\u90e8\u7f72\u65f6\u3002<\/p>\n<h3>1. \u8def\u7531\u4e0e\u4e22\u5305\u5206\u6790<\/h3>\n<ul>\n<li>\u4f7f\u7528 mtr\uff08Windows \u53ef\u7528 WinMTR\uff09\u89c2\u5bdf\u5168\u7a0b\u4e22\u5305\u4e0e\u5ef6\u8fdf\u6ce2\u52a8\uff1a\n<pre>mtr -rwzbc100 example-cdn-edge-ip<\/pre>\n<p>  \u5173\u6ce8\u4e2d\u95f4\u8dc3\u70b9\u662f\u5426\u5b58\u5728\u7a33\u5b9a\u4e22\u5305\u6216\u6296\u52a8\u3002<\/li>\n<li>\u6392\u67e5 MTU \u4e0e\u5206\u7247\u95ee\u9898\uff0c\u53ef\u4ee5\u901a\u8fc7 ping \u7684\u5206\u7247\u6d4b\u8bd5\uff1a\n<pre>ping -M do -s 1472 \uff08Unix\uff09<\/pre>\n<p>  \u82e5\u5206\u7247\u5bfc\u81f4\u91cd\u4f20\uff0c\u4f1a\u5f71\u54cd\u5927\u5bf9\u8c61\uff08\u89c6\u9891\u3001\u538b\u7f29\u5305\uff09\u4f20\u8f93\u3002<\/li>\n<\/ul>\n<h3>2. DNS \u89e3\u6790\u6027\u80fd<\/h3>\n<ul>\n<li>\u4f7f\u7528 dig \u6216 nslookup \u6d4b\u8bd5\u89e3\u6790\u65f6\u95f4\u4e0e\u8fd4\u56de\u8bb0\u5f55\uff1a\n<pre>dig +noall +stats www.example.com<\/pre>\n<p>  \u5173\u6ce8\u8fd4\u56de\u7684 CNAME\u3001TTL \u4e0e\u662f\u5426\u8fd4\u56de\u591a\u4e2a Anycast IP\u3002<\/li>\n<li>\u5206\u6790\u662f\u5426\u5b58\u5728\u4e0d\u5408\u7406\u7684 TTL\uff08\u8fc7\u77ed\u5bfc\u81f4\u9891\u7e41\u89e3\u6790\uff09\u3001DNS \u8f6e\u8be2\/GeoDNS \u914d\u7f6e\u95ee\u9898\u5bfc\u81f4\u7528\u6237\u88ab\u5bfc\u5411\u975e\u6700\u4f18 PoP\u3002<\/li>\n<\/ul>\n<p><strong>\u5efa\u8bae<\/strong>\uff1a\u542f\u7528 Anycast DNS \u4e0e\u5408\u7406\u7684 TTL\uff08\u793a\u4f8b\uff1a60-300 \u79d2\u7528\u4e8e\u9891\u7e41\u53d8\u66f4\uff0c300-3600 \u79d2\u7528\u4e8e\u7a33\u5b9a\u7ad9\u70b9\uff09\uff0c\u5e76\u5728\u5e38\u89c1\u8bbf\u95ee\u56fd\uff08\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u3001\u7f8e\u56fd\uff09\u5e03\u7f6e\u76d1\u63a7\u70b9\u5b9a\u671f\u68c0\u6d4b\u89e3\u6790\u8d28\u91cf\u3002<\/p>\n<h2>\u6b65\u9aa4\u56db\uff1aHTTP\u3001TLS \u4e0e\u7f13\u5b58\u7b56\u7565\u68c0\u67e5<\/h2>\n<p>\u5f88\u591a\u6027\u80fd\u95ee\u9898\u6e90\u81ea HTTP\/2\u3001TLS \u63e1\u624b\u3001\u7f13\u5b58\u63a7\u5236\u6216\u538b\u7f29\u8bbe\u7f6e\u4e0d\u5f53\u3002<\/p>\n<h3>1. TLS \u4f18\u5316<\/h3>\n<ul>\n<li>\u68c0\u67e5 TLS \u63e1\u624b\u65f6\u95f4\uff08curl time_appconnect\uff09\uff0c\u542f\u7528 TLS 1.3\u3001\u4f1a\u8bdd\u6062\u590d\uff08session resumption\uff09\u3001OCSP stapling \u4e0e ALPN \u53ef\u5927\u5e45\u51cf\u5c11\u63e1\u624b\u5f00\u9500\u3002<\/li>\n<li>\u4f7f\u7528 openssl s_client \u68c0\u67e5\u8bc1\u4e66\u94fe\u4e0e\u534f\u5546\uff1a\n<pre>openssl s_client -connect www.example.com:443 -alpn h2<\/pre>\n<p>  \u786e\u8ba4\u652f\u6301 HTTP\/2 \u4e0e\u5408\u9002\u7684\u5bc6\u94a5\u4ea4\u6362\u7b97\u6cd5\uff08\u5982 ECDHE\uff09\u3002<\/li>\n<\/ul>\n<h3>2. HTTP\/\u7f13\u5b58\u5934\u4e0e\u538b\u7f29<\/h3>\n<ul>\n<li>\u786e\u8ba4\u7f13\u5b58\u76f8\u5173\u5934\u90e8\uff1aCache-Control\u3001Expires\u3001Vary\u3001ETag\u3002\u5bf9\u9759\u6001\u8d44\u6e90\uff08\u56fe\u7247\u3001JS\u3001CSS\uff09\u5e94\u8bbe\u7f6e\u957f\u671f\u7f13\u5b58\u5e76\u4f7f\u7528\u7248\u672c\u5316\u8def\u5f84\uff08\u4f8b\u5982 hash\uff09\u4ee5\u5229\u4e8e\u9ad8\u7f13\u5b58\u547d\u4e2d\u3002<\/li>\n<li>\u5f00\u542f Brotli \u6216 gzip \u538b\u7f29\u5e76\u4f18\u5148\u5bf9 text\u3001json\u3001svg \u7b49\u7c7b\u578b\u542f\u7528\u3002\u5bf9\u5927\u4f53\u79ef\u5a92\u4f53\uff08\u89c6\u9891\u3001\u538b\u7f29\u5305\uff09\u5173\u95ed\u538b\u7f29\u4ee5\u907f\u514d CPU \u8fc7\u8f7d\u3002<\/li>\n<li>\u5206\u6790 CDN \u7684 Cache Key \u914d\u7f6e\uff0c\u907f\u514d\u56e0\u4e3a Cookie\u3001Query String \u5bfc\u81f4\u7f13\u5b58\u788e\u7247\u5316\u3002\u4f8b\u5982\u5bf9\u9759\u6001\u8d44\u6e90\u5ffd\u7565 Cookie\uff0c\u5bf9 API \u8bf7\u6c42\u6839\u636e\u5fc5\u8981\u53c2\u6570\u8bbe\u5b9a Cache Key\u3002<\/li>\n<\/ul>\n<h3>3. \u7f13\u5b58\u547d\u4e2d\u7387\u4e0e\u56de\u6e90\u9891\u7387<\/h3>\n<p>\u82e5\u7f13\u5b58\u547d\u4e2d\u7387\u4f4e\uff0c\u5bfc\u81f4\u5927\u91cf\u56de\u6e90\uff0c\u68c0\u67e5\uff1a<\/p>\n<ul>\n<li>\u662f\u5426\u5bf9\u52a8\u6001\u5185\u5bb9\u9519\u8bef\u8bbe\u7f6e\u4e86 no-cache \u6216 private\u3002<\/li>\n<li>\u662f\u5426\u4f7f\u7528\u4e86\u8fc7\u591a\u7684 Cache-Busting\uff08\u5982\u9891\u7e41\u53d8\u52a8\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\uff09\u3002<\/li>\n<li>\u662f\u5426\u542f\u7528\u4e86 Edge Side Includes\uff08ESI\uff09\u6216\u5206\u7247\u7f13\u5b58\u7b56\u7565\uff0c\u5408\u7406\u62c6\u5206\u9875\u9762\u5c06\u70ed\u70b9\u9759\u6001\u8d44\u6e90\u4ea4\u7ed9 CDN\uff0c\u52a8\u6001\u90e8\u5206\u4fdd\u6301\u5c0f\u4f53\u79ef\u56de\u6e90\u3002<\/li>\n<\/ul>\n<h2>\u6b65\u9aa4\u4e94\uff1a\u4fee\u590d\u63aa\u65bd\u4e0e\u9a8c\u8bc1\uff08\u90e8\u7f72\u4e0e\u56de\u5f52\u6d4b\u8bd5\uff09<\/h2>\n<p>\u5b9a\u4f4d\u95ee\u9898\u540e\uff0c\u5236\u5b9a\u4fee\u590d\u8ba1\u5212\u5e76\u8fdb\u884c\u5c0f\u8303\u56f4\u9a8c\u8bc1\uff1a<\/p>\n<ul>\n<li>\u7f51\u7edc\u5c42\u9762\uff1a\u4e0e\u6258\u7ba1\u5546\u6216\u8fd0\u8425\u5546\u6c9f\u901a\u4e22\u5305\/\u8def\u7531\u95ee\u9898\uff1b\u5bf9\u4e8e\u8de8\u5883\u7528\u6237\u53ef\u8003\u8651\u5728\u5173\u952e\u5730\u533a\u90e8\u7f72\u989d\u5916 PoP\u3001\u4f7f\u7528\u591a\u4e91\u6216\u591a\u533a\u57df\u6e90\u7ad9\uff08\u4f8b\u5982\u9999\u6e2f\u670d\u52a1\u5668 + \u7f8e\u56fd\u670d\u52a1\u5668 \u7ec4\u5408\uff09\u5e76\u542f\u7528\u667a\u80fd\u56de\u6e90\u3002<\/li>\n<li>\u6e90\u7ad9\u4f18\u5316\uff1a\u63d0\u9ad8\u6e90\u7ad9\u5e76\u53d1\u80fd\u529b\uff08\u8c03\u6574 Nginx 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