{"id":30814,"date":"2026-05-20T12:00:00","date_gmt":"2026-05-20T04:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=30814"},"modified":"2026-05-17T07:13:27","modified_gmt":"2026-05-16T23:13:27","slug":"dns-optimization-geo-practical","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/wordpress\/dns-optimization-geo-practical\/","title":{"rendered":"DNS \u89e3\u6790\u901f\u5ea6\u4f18\u5316\u4e0e GeoDNS \u914d\u7f6e\u5b9e\u6218"},"content":{"rendered":"<p><img decoding=\"async\" alt=\"DNS \u89e3\u6790\u901f\u5ea6\u4f18\u5316\u4e0e GeoDNS \u914d\u7f6e\u5b9e\u6218 \u5c01\u9762\u914d\u56fe\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/05\/dns-optimization-geo-practical-cover.webp\" \/><\/p>\n<p>\u672c\u6307\u5357\u6559\u4f60\u5982\u4f55\u628a DNS \u89e3\u6790\u901f\u5ea6\u4ece\u884c\u4e1a\u5e73\u5747\u7684\u4e24\u767e\u6beb\u79d2\u964d\u5230\u4e09\u5341\u6beb\u79d2\u4ee5\u5185\uff0c\u5e76\u901a\u8fc7 GeoDNS\uff08\u57fa\u4e8e\u5730\u7406\u4f4d\u7f6e\u7684\u667a\u80fd\u89e3\u6790\uff09\u628a\u4e0d\u540c\u5730\u533a\u7684\u7528\u6237\u89e3\u6790\u5230\u6700\u8fd1\u7684\u6e90\u7ad9\u3002\u5f88\u591a\u56e2\u961f\u4f18\u5316\u7f51\u7ad9\u65f6\u628a\u6ce8\u610f\u529b\u653e\u5728 TLS \u63e1\u624b\u548c CDN \u547d\u4e2d\u7387\u4e0a\uff0c\u5374\u5ffd\u7565\u4e86\u4e00\u4e2a\u4e8b\u5b9e\uff1a\u6d4f\u89c8\u5668\u5728\u53d1\u8d77\u4efb\u4f55 HTTP \u8bf7\u6c42\u4e4b\u524d\uff0c\u90fd\u8981\u5148\u505a\u4e00\u6b21 DNS \u89e3\u6790\u3002\u8fd9\u4e00\u6b65\u5982\u679c\u8d70\u7684\u662f\u5883\u5916\u6743\u5a01\u670d\u52a1\u5668\uff0c\u7b49\u4e8e\u5728\u7528\u6237\u9996\u5c4f\u524d\u9762\u51ed\u7a7a\u585e\u8fdb\u4e00\u6b21\u8de8\u6d0b\u5f80\u8fd4\u3002\u672c\u6587\u4f1a\u4ece TTL \u8bbe\u7f6e\u3001Anycast \u90e8\u7f72\u3001\u89e3\u6790\u5ef6\u8fdf\u76d1\u63a7\u5230 GeoDNS \u5206\u6d41\u7b56\u7565\u9010\u6b65\u5c55\u5f00\uff0c\u5e2e\u52a9\u4f60\u4e3a\u5168\u7403\u7528\u6237\u63d0\u4f9b\u7a33\u5b9a\u7684\u9996\u5b57\u8282\u65f6\u95f4\u3002<\/p>\n<h2>DNS \u89e3\u6790\u6162\u5728\u54ea\u91cc<\/h2>\n<p>\u4e00\u6b21\u5b8c\u6574\u7684 DNS \u67e5\u8be2\u8981\u7ecf\u8fc7\u56db\u7ea7\uff1a\u6d4f\u89c8\u5668\u7f13\u5b58\u3001\u64cd\u4f5c\u7cfb\u7edf\u7f13\u5b58\u3001\u672c\u5730\u9012\u5f52\uff08\u8fd0\u8425\u5546\u6216\u516c\u5171 DNS\uff09\u3001\u6743\u5a01\u670d\u52a1\u5668\u3002\u5982\u679c\u524d\u4e09\u7ea7\u90fd\u6ca1\u547d\u4e2d\uff0c\u6700\u540e\u4e00\u6b65\u53bb\u67e5\u6743\u5a01\uff0c\u8017\u65f6\u4e3b\u8981\u53d6\u51b3\u4e8e\uff1a<\/p>\n<ul>\n<li>\u6743\u5a01\u670d\u52a1\u5668\u7684\u7269\u7406\u4f4d\u7f6e\uff1a\u5728\u7f8e\u56fd\u897f\u6d77\u5cb8\u7684\u6743\u5a01\uff0c\u56fd\u5185\u7528\u6237\u89e3\u6790\u8981\u8d70\u4e24\u767e\u6beb\u79d2\u4ee5\u4e0a<\/li>\n<li>\u662f\u5426\u542f\u7528 Anycast\uff1a\u5355\u70b9\u6743\u5a01\u9047\u5230\u8282\u70b9\u6545\u969c\u4f1a\u89e6\u53d1\u9012\u5f52\u91cd\u8bd5\uff0c\u96ea\u4e0a\u52a0\u971c<\/li>\n<li>\u57df\u540d\u5c42\u7ea7\uff1a\u6bcf\u591a\u4e00\u7ea7\u5b50\u57df\uff0c\u9012\u5f52\u5c31\u591a\u4e00\u6b21\u8fed\u4ee3\u67e5\u8be2<\/li>\n<li>DNSSEC\uff1a\u5f00\u542f\u540e\u54cd\u5e94\u4f53\u53d8\u5927\uff0cUDP \u622a\u65ad\u56de\u9000\u5230 TCP \u8fd8\u4f1a\u518d\u591a\u4e00\u6b21\u63e1\u624b<\/li>\n<\/ul>\n<p>\u7406\u89e3\u8fd9\u6761\u94fe\u8def\u5c31\u77e5\u9053\uff0c\u5149\u628a TTL \u8c03\u957f\u662f\u4e0d\u591f\u7684\u2014\u2014TTL \u89e3\u51b3\u7684\u662f\u91cd\u590d\u67e5\u8be2\uff0c\u4e0d\u89e3\u51b3\u9996\u6b21\u67e5\u8be2\u3002<\/p>\n<h2>TTL \u7684\u53d6\u820d<\/h2>\n<p>\u5f88\u591a\u4eba\u628a TTL \u8bbe\u6210 60 \u79d2\u4ee5\u4e3a&#8221;\u7075\u6d3b\u5207\u6362&#8221;\uff0c\u7ed3\u679c\u9012\u5f52\u670d\u52a1\u5668\u6bcf\u5206\u949f\u90fd\u8981\u56de\u6e90\u4e00\u6b21\uff0c\u6743\u5a01\u8d1f\u8f7d\u66b4\u6da8\u4e14\u7528\u6237\u4f53\u9a8c\u66f4\u5dee\u3002\u5408\u7406\u7684\u505a\u6cd5\u662f\u5206\u7c7b\u5904\u7406\uff1a<\/p>\n<ul>\n<li>\u4e3b\u57df A \u8bb0\u5f55\uff1a300-600 \u79d2\uff0c\u9700\u8981\u7070\u5ea6\u5207\u6d41\u65f6\u518d\u4e34\u65f6\u964d\u4f4e<\/li>\n<li>CNAME \u6307\u5411 CDN\uff1a\u8ddf\u968f CDN \u5382\u5546\u5efa\u8bae\uff0c\u4e00\u822c 60-300 \u79d2<\/li>\n<li>MX\u3001TXT\u3001SPF\uff1a3600 \u79d2\u4ee5\u4e0a\uff0c\u51e0\u4e4e\u4e0d\u53d8<\/li>\n<li>\u4e34\u65f6\u9a8c\u8bc1\u7528 TXT\uff1a\u4f4e TTL\uff0860-120 \u79d2\uff09\uff0c\u7528\u5b8c\u7acb\u523b\u5220<\/li>\n<\/ul>\n<p>\u5207\u6d41\u524d\u7684\u64cd\u4f5c\u5efa\u8bae\uff1a\u63d0\u524d 24 \u5c0f\u65f6\u628a TTL \u4ece 600 \u964d\u5230 60\uff0c\u7b49\u9012\u5f52\u7f13\u5b58\u5168\u90e8\u5237\u65b0\u540e\u518d\u505a DNS \u5207\u6362\uff0c\u5207\u5b8c\u7acb\u523b\u628a TTL \u8c03\u56de\u53bb\u3002\u8fd9\u6837\u65e2\u80fd\u5feb\u901f\u56de\u6eda\uff0c\u53c8\u4e0d\u4f1a\u957f\u671f\u627f\u62c5\u77ed TTL \u7684\u8d1f\u8f7d\u4ee3\u4ef7\u3002<\/p>\n<h2>Anycast \u4e0e\u591a\u6743\u5a01\u90e8\u7f72<\/h2>\n<p>\u5355\u53f0\u6743\u5a01\u670d\u52a1\u5668\u7684\u5ef6\u8fdf\u53d6\u51b3\u4e8e\u7269\u7406\u8ddd\u79bb\uff0c\u518d\u4f18\u5316\u4e5f\u6709\u4e0b\u9650\u3002Anycast \u662f\u628a\u540c\u4e00\u4e2a IP \u5ba3\u544a\u5230\u591a\u4e2a\u5730\u7406\u8282\u70b9\uff0c\u8ba9\u7528\u6237\u7684\u9012\u5f52\u8bf7\u6c42\u88ab\u8def\u7531\u5230\u6700\u8fd1\u7684\u8282\u70b9\u3002\u5e38\u89c1\u7684\u516c\u5171 DNS\uff08Cloudflare 1.1.1.1\u3001Google 8.8.8.8\uff09\u90fd\u662f\u57fa\u4e8e Anycast\u3002<\/p>\n<p>\u81ea\u5df1\u8dd1\u6743\u5a01\u7684\u8bdd\uff0c\u8981\u4e48\u7528\u652f\u6301 Anycast \u7684\u6258\u7ba1\u670d\u52a1\uff08Cloudflare\u3001AWS Route 53\u3001NS1\uff09\uff0c\u8981\u4e48\u5728\u4e0d\u540c\u5730\u533a\u90e8\u7f72\u4e24\u5230\u56db\u53f0 BIND\uff0c\u901a\u8fc7 NS \u8bb0\u5f55\u5206\u6d41\u3002\u591a\u6743\u5a01\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5404\u6743\u5a01\u4e4b\u95f4\u7528 AXFR\/IXFR \u540c\u6b65\uff0c\u4e3b\u5907\u6a21\u578b\u8981\u660e\u786e<\/li>\n<li>NS \u8bb0\u5f55\u987a\u5e8f\u5bf9\u9012\u5f52\u9009\u62e9\u6709\u5fae\u5f31\u5f71\u54cd\uff0c\u4f46\u4e0d\u80fd\u4f9d\u8d56<\/li>\n<li>\u76d1\u63a7\u6bcf\u4e2a\u6743\u5a01\u7684\u89e3\u6790\u6210\u529f\u7387\uff0c\u4e00\u65e6\u6389\u7ebf\u7acb\u523b\u4ece NS \u5217\u8868\u91cc\u6458\u6389<\/li>\n<li>\u540c\u4e00\u4e2a zone \u5728\u4e0d\u540c\u6743\u5a01\u4e0a\u7684\u7248\u672c\u8981\u4e00\u81f4\uff0c\u5e8f\u5217\u53f7\u8981\u540c\u6b65<\/li>\n<\/ul>\n<p>\u5982\u679c\u53ea\u670d\u52a1\u56fd\u5185\u7528\u6237\uff0c\u5e38\u89c1\u7684\u7b80\u5316\u505a\u6cd5\u662f\u76f4\u63a5\u63a5\u5165\u652f\u6301 BGP Anycast \u7684\u56fd\u5185 DNS \u5382\u5546\u3002\u6d89\u53ca\u8de8\u5883\u5206\u6d41\u65f6\uff0c\u5efa\u8bae\u53c2\u8003 <a href=\"https:\/\/cn.hostease.com\/blog\/cdn\/cloudflare-cdn-china-acceleration\/\">Cloudflare CDN \u4e2d\u56fd\u52a0\u901f<\/a> \u4e2d\u5173\u4e8e Anycast \u8282\u70b9\u8986\u76d6\u4e0e\u5883\u5185\u56de\u6e90\u7684\u7ae0\u8282\u3002<\/p>\n<h2>GeoDNS \u667a\u80fd\u89e3\u6790<\/h2>\n<p>GeoDNS \u7684\u6838\u5fc3\u662f\u540c\u4e00\u4e2a\u57df\u540d\uff0c\u9488\u5bf9\u4e0d\u540c\u6765\u6e90 IP \u8fd4\u56de\u4e0d\u540c\u7684 A \u8bb0\u5f55\u3002\u5178\u578b\u7684\u5206\u6d41\u7b56\u7565\u6709\u4e09\u79cd\uff1a<\/p>\n<ul>\n<li>\u6309\u5927\u9646\/\u56fd\u5bb6\uff1a\u6b27\u6d32\u89e3\u6790\u5230\u6cd5\u5170\u514b\u798f\u3001\u5317\u7f8e\u89e3\u6790\u5230\u5f17\u5409\u5c3c\u4e9a\u3001\u4e9a\u6d32\u89e3\u6790\u5230\u4e1c\u4eac<\/li>\n<li>\u6309\u8fd0\u8425\u5546\uff1a\u56fd\u5185\u7535\u4fe1\u89e3\u6790\u5230\u7535\u4fe1\u6e90\u7ad9\u3001\u8054\u901a\u89e3\u6790\u5230\u8054\u901a\u6e90\u7ad9<\/li>\n<li>\u6309\u5ef6\u8fdf\u63a2\u6d4b\uff1a\u5b9e\u65f6\u6d4b\u91cf\u6bcf\u4e2a\u5019\u9009\u6e90\u7ad9\u5230\u9012\u5f52 DNS \u7684 RTT\uff0c\u6311\u6700\u4f4e\u7684\u8fd4\u56de<\/li>\n<\/ul>\n<p>\u7b2c\u4e09\u79cd\u6700\u51c6\u786e\u4f46\u5b9e\u73b0\u590d\u6742\uff0c\u53ea\u6709\u5c11\u6570\u5382\u5546\uff08NS1\u3001DNSPod \u4f01\u4e1a\u7248\uff09\u652f\u6301\u3002\u524d\u4e24\u79cd\u57fa\u4e8e GeoIP \u6570\u636e\u5e93\u5373\u53ef\uff0c\u9700\u8981\u6ce8\u610f GeoIP \u5e93\u7684\u66f4\u65b0\u9891\u7387\u2014\u2014\u4e00\u5e74\u4e0d\u66f4\u65b0\u7684\u5e93\u51c6\u786e\u7387\u4f1a\u6389\u5230 80% \u4ee5\u4e0b\u3002<\/p>\n<p>\u843d\u5730\u65f6\u5efa\u8bae\u5148\u7528\u6309\u5927\u9646\u5206\u6d41\u8dd1\u4e24\u5468\uff0c\u5bf9\u6bd4\u6bcf\u4e2a\u5730\u533a\u7684\u9996\u5b57\u8282\u65f6\u95f4\uff0c\u518d\u51b3\u5b9a\u662f\u5426\u7ec6\u5316\u5230\u8fd0\u8425\u5546\u3002<\/p>\n<h2>\u76d1\u63a7\u89e3\u6790\u5ef6\u8fdf<\/h2>\n<p>\u6ca1\u6709\u6570\u636e\u5c31\u6ca1\u529e\u6cd5\u4f18\u5316\u3002\u5efa\u8bae\u81f3\u5c11\u8dd1\u4e09\u5c42\u76d1\u63a7\uff1a<\/p>\n<ul>\n<li>\u771f\u5b9e\u7528\u6237\u76d1\u63a7\uff08RUM\uff09\uff1a\u901a\u8fc7 navigation.timing API \u6536\u96c6 domainLookupEnd &#8211; domainLookupStart<\/li>\n<li>\u4e3b\u52a8\u63a2\u6d4b\uff1a\u7528 dig \u5728\u56fd\u5185\u5916\u591a\u4e2a\u8282\u70b9\u5b9a\u65f6\u67e5\u8be2\uff0c\u8bb0\u5f55\u54cd\u5e94\u65f6\u95f4<\/li>\n<li>\u6743\u5a01\u4fa7\u65e5\u5fd7\uff1a\u5f00\u542f\u67e5\u8be2\u65e5\u5fd7\uff0c\u7edf\u8ba1\u6bcf\u4e2a zone \u7684 QPS \u4e0e\u54cd\u5e94\u5206\u5e03<\/li>\n<\/ul>\n<p>\u628a\u8fd9\u4e09\u7ec4\u6570\u636e\u5bf9\u9f50\u5230\u540c\u4e00\u65f6\u95f4\u8f74\uff0c\u5c31\u80fd\u770b\u51fa\u95ee\u9898\u662f\u51fa\u5728\u6743\u5a01\u3001\u9012\u5f52\u8fd8\u662f\u5ba2\u6237\u7aef\u3002\u5982\u679c\u4f60\u7684\u5165\u53e3\u524d\u9762\u6302\u4e86\u53cd\u5411\u4ee3\u7406\uff0c\u53ef\u4ee5\u4e00\u5e76\u628a DNS \u89e3\u6790\u65f6\u95f4\u7eb3\u5165 Nginx \u7684\u8bbf\u95ee\u65e5\u5fd7\uff0c\u914d\u7f6e\u65b9\u6cd5\u53ef\u4ee5\u770b <a href=\"https:\/\/cn.hostease.com\/blog\/server\/nginx-reverse-proxy-load-balancing\/\">Nginx \u53cd\u5411\u4ee3\u7406\u4e0e\u8d1f\u8f7d\u5747\u8861\u5b9e\u6218<\/a> \u4e2d\u5173\u4e8e <code>$upstream_response_time<\/code> \u7684\u6269\u5c55\u7528\u6cd5\u3002<\/p>\n<h2>\u90e8\u7f72\u4e00\u53f0\u81ea\u5efa\u6743\u5a01\uff1aBIND \u7b80\u5316\u793a\u4f8b<\/h2>\n<p>\u5982\u679c\u4e1a\u52a1\u89c4\u6a21\u9700\u8981\u81ea\u5efa\u6743\u5a01\uff0c\u6700\u5c0f\u53ef\u7528\u914d\u7f6e\u5c31\u662f\u4e00\u53f0 BIND9\u3002zone \u6587\u4ef6\u7ed3\u6784\u662f\uff1a<\/p>\n<pre><code>$TTL 600\n@   IN  SOA ns1.example.com. admin.example.com. (\n        2026051701 ; serial\n        3600       ; refresh\n        600        ; retry\n        604800     ; expire\n        300 )      ; minimum\n    IN  NS  ns1.example.com.\n    IN  NS  ns2.example.com.\n@   IN  A   203.0.113.10\nwww IN  A   203.0.113.10\n<\/code><\/pre>\n<p>\u6bcf\u6b21\u6539\u8bb0\u5f55\u90fd\u8981\u624b\u52a8\u52a0 serial \u53f7\uff0c\u5426\u5219\u4ece\u8282\u70b9\u4e0d\u4f1a\u62c9\u65b0\u7248\u672c\u3002\u751f\u4ea7\u73af\u5883\u63a8\u8350\u7528 PowerDNS + MySQL \u540e\u7aef\uff0c\u65b9\u4fbf\u63a5 GeoDNS \u63d2\u4ef6\u4e0e\u81ea\u52a8\u5316\u3002<\/p>\n<p>\u670d\u52a1\u5668\u9762\u5411\u516c\u7f51\u540e\uff0c\u8bb0\u5f97\u505a SSH \u4e0e\u9632\u706b\u5899\u52a0\u56fa\uff0c\u628a 53 \u7aef\u53e3\u53ea\u5bf9\u5fc5\u8981\u6e90\u5f00\u653e\u3002\u57fa\u7840\u7684 <a href=\"https:\/\/cn.hostease.com\/blog\/linux\/linux-ssh-fail2ban-hardening\/\">SSH \u4e0e Fail2ban \u52a0\u56fa<\/a> \u6a21\u677f\u53ef\u4ee5\u76f4\u63a5\u5957\u7528\uff0c\u518d\u53e0\u52a0\u4e00\u4efd BIND \u4e13\u5c5e\u7684 ACL \u9650\u5236\u67e5\u8be2\u6e90\u3002WordPress \u7b49\u5e94\u7528\u5c42\u7684\u914d\u7f6e\u53ef\u4ee5\u53c2\u8003 <a href=\"https:\/\/cn.hostease.com\/blog\/wordpress\/wordpress-w3-total-cache-tuning\/\">WordPress \u4e0e W3 Total Cache \u8c03\u4f18<\/a> \u628a\u9875\u9762\u7f13\u5b58\u5c42\u4e00\u5e76\u6253\u901a\u3002<\/p>\n<h2>\u5e38\u89c1\u8e29\u5751<\/h2>\n<ul>\n<li>TTL \u957f\u671f\u8bbe 60 \u79d2\uff0c\u6743\u5a01\u88ab\u6253\u7206\u3001\u9012\u5f52\u547d\u4e2d\u7387\u6781\u4f4e<\/li>\n<li>GeoIP \u5e93\u4e00\u5e74\u4e0d\u66f4\u65b0\uff0c\u56fd\u5185 IP \u6bb5\u53d8\u5316\u5927\uff0c\u5206\u6d41\u51c6\u786e\u7387\u6389\u5230 70% \u4ee5\u4e0b<\/li>\n<li>\u81ea\u5efa\u6743\u5a01\u6ca1\u5f00 Anycast \u4e5f\u6ca1\u505a\u591a\u5730\u533a\u90e8\u7f72\uff0c\u5355\u70b9\u6545\u969c\u5f71\u54cd\u5168\u7ad9<\/li>\n<li>DNSSEC \u5f00\u4e86\u4f46\u6ca1\u5728\u9012\u5f52\u7aef\u6d4b\u8bd5\u8fc7\uff0cUDP \u622a\u65ad\u5bfc\u81f4\u90e8\u5206\u7528\u6237\u89e3\u6790\u5931\u8d25<\/li>\n<li>\u5207\u6d41\u524d\u6ca1\u63d0\u524d\u964d TTL\uff0c\u7ed3\u679c\u56de\u6eda\u8981\u7b49\u51e0\u5c0f\u65f6\u624d\u751f\u6548<\/li>\n<\/ul>\n<h2>\u603b\u7ed3<\/h2>\n<p>DNS \u4f18\u5316\u4e0d\u662f\u67d0\u4e00\u4e2a\u5f00\u5173\uff0c\u800c\u662f TTL \u7b56\u7565\u3001\u6743\u5a01\u90e8\u7f72\u548c\u76d1\u63a7\u4e09\u4ef6\u4e8b\u7684\u7ec4\u5408\u3002\u5efa\u8bae\u5148\u628a\u73b0\u6709\u89e3\u6790\u5ef6\u8fdf\u6478\u6e05\u695a\uff0c\u4ece RUM \u6570\u636e\u770b P95 \u4e0e P99 \u5728\u4e0d\u540c\u5730\u533a\u7684\u5dee\u5f02\uff0c\u518d\u51b3\u5b9a\u662f\u4e0a Anycast\u3001\u52a0 GeoDNS \u8fd8\u662f\u53ea\u6539 TTL\u3002\u5982\u679c\u4f60\u9700\u8981\u7ed9\u8de8\u5883\u4e1a\u52a1\u505a\u52a0\u901f\uff0c\u53ef\u4ee5\u8003\u8651\u628a\u6743\u5a01\u6258\u7ba1\u5230\u5168\u7403 Anycast \u670d\u52a1\u5546\uff0c\u6e90\u7ad9\u5c42\u9762\u518d\u7528 GeoDNS \u5206\u6d41\u5230\u6700\u8fd1\u7684\u673a\u623f\u3002\u6574\u4f53\u4e0b\u6765\u4f60\u4f1a\u53d1\u73b0\uff0cDNS \u8fd9\u5c42\u7684\u4f18\u5316\u6536\u76ca\u5f80\u5f80\u88ab\u4f4e\u4f30\uff0c\u4f46\u5b83\u662f\u7528\u6237\u4f53\u9a8c\u94fe\u8def\u4e0a\u6700\u65e9\u7684\u90a3\u4e00\u73af\u2014\u2014\u524d\u9762\u5feb\u4e00\u767e\u6beb\u79d2\uff0c\u540e\u9762\u6240\u6709\u6307\u6807\u90fd\u4f1a\u8ddf\u7740\u597d\u770b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6559\u4f60\u5982\u4f55\u7cfb\u7edf\u4f18\u5316 DNS \u89e3\u6790\u901f\u5ea6\u5e76\u914d\u7f6e GeoDNS \u667a\u80fd\u89e3\u6790\uff0c\u4ece TTL 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