{"id":27860,"date":"2025-05-04T11:08:23","date_gmt":"2025-05-04T04:08:23","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=27860"},"modified":"2025-05-29T17:48:44","modified_gmt":"2025-05-29T10:48:44","slug":"ban-ghi-cname-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/","title":{"rendered":"B\u1ea3n ghi CNAME l\u00e0 g\u00ec? \u0110\u1ecbnh ngh\u0129a, C\u00e1ch d\u00f9ng &#038; V\u00ed d\u1ee5 DNS CNAME"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Ban-ghi-CNAME-la-gi\" >B\u1ea3n ghi CNAME l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Ban-ghi-CNAME-hoat-dong-nhu-the-nao-trong-DNS\" >B\u1ea3n ghi CNAME ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o trong DNS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#So-sanh-ban-ghi-CNAME-va-ban-ghi-A-A-Record\" >So s\u00e1nh b\u1ea3n ghi CNAME v\u00e0 b\u1ea3n ghi A (A Record)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Khi-nao-nen-su-dung-ban-ghi-CNAME\" >Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Khi-nao-nen-su-dung-ban-ghi-A\" >Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng b\u1ea3n ghi A?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Cac-truong-hop-su-dung-ban-ghi-CNAME-pho-bien-nhat\" >C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME ph\u1ed5 bi\u1ebfn nh\u1ea5t<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Tao-bi-danh-cho-WWW-www-alias\" >T\u1ea1o b\u00ed danh cho WWW (www alias)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Tro-ten-mien-phu-Subdomain-den-dich-vu-ben-ngoai\" >Tr\u1ecf t\u00ean mi\u1ec1n ph\u1ee5 (Subdomain) \u0111\u1ebfn d\u1ecbch v\u1ee5 b\u00ean ngo\u00e0i<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Xac-thuc-quyen-so-huu-ten-mien-Domain-Verification\" >X\u00e1c th\u1ef1c quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n (Domain Verification)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Huong-dan-co-ban-ve-tao-va-quan-ly-ban-ghi-CNAME\" >H\u01b0\u1edbng d\u1eabn c\u01a1 b\u1ea3n v\u1ec1 t\u1ea1o v\u00e0 qu\u1ea3n l\u00fd b\u1ea3n ghi CNAME<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Cac-thong-tin-can-nhap-khi-tao-CNAME\" >C\u00e1c th\u00f4ng tin c\u1ea7n nh\u1eadp khi t\u1ea1o CNAME<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Cach-kiem-tra-ban-ghi-CNAME-da-hoat-dong-chua\" >C\u00e1ch ki\u1ec3m tra b\u1ea3n ghi CNAME \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng ch\u01b0a<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Nhung-luu-y-quan-trong-khi-su-dung-ban-ghi-CNAME\" >Nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Han-che-tao-CNAME-tai-ten-mien-goc-Apex-DomainRoot-Domain\" >H\u1ea1n ch\u1ebf t\u1ea1o CNAME t\u1ea1i t\u00ean mi\u1ec1n g\u1ed1c (Apex Domain\/Root Domain)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Anh-huong-tiem-an-den-hieu-suat-truy-van-DNS\" >\u1ea2nh h\u01b0\u1edfng ti\u1ec1m \u1ea9n \u0111\u1ebfn hi\u1ec7u su\u1ea5t truy v\u1ea5n DNS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Thiet-lap-gia-tri-TTL-Time-To-Live-phu-hop\" >Thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb TTL (Time To Live) ph\u00f9 h\u1ee3p<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Cau-hoi-thuong-gap-ve-ban-ghi-CNAME-FAQ\" >C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 b\u1ea3n ghi CNAME (FAQ)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Co-the-tao-nhieu-ban-ghi-CNAME-cho-cung-mot-ten-alias-khong\" >C\u00f3 th\u1ec3 t\u1ea1o nhi\u1ec1u b\u1ea3n ghi CNAME cho c\u00f9ng m\u1ed9t t\u00ean (alias) kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Co-the-tao-ban-ghi-CNAME-tro-den-mot-dia-chi-IP-khong\" >C\u00f3 th\u1ec3 t\u1ea1o b\u1ea3n ghi CNAME tr\u1ecf \u0111\u1ebfn m\u1ed9t \u0111\u1ecba ch\u1ec9 IP kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Ban-ghi-CNAME-co-anh-huong-den-SEO-khong\" >B\u1ea3n ghi CNAME c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn SEO kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Mat-bao-lau-de-thay-doi-ban-ghi-CNAME-co-hieu-luc\" >M\u1ea5t bao l\u00e2u \u0111\u1ec3 thay \u0111\u1ed5i b\u1ea3n ghi CNAME c\u00f3 hi\u1ec7u l\u1ef1c?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/#Co-the-tao-CNAME-tro-den-mot-CNAME-khac-khong\" >C\u00f3 th\u1ec3 t\u1ea1o CNAME tr\u1ecf \u0111\u1ebfn m\u1ed9t CNAME kh\u00e1c kh\u00f4ng?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<p>B\u1ea1n \u0111ang qu\u1ea3n l\u00fd <a href=\"https:\/\/interdata.vn\/blog\/website-la-gi\/\">website<\/a> ho\u1eb7c <a href=\"https:\/\/interdata.vn\/blog\/domain-la-gi\/\">t\u00ean mi\u1ec1n<\/a> v\u00e0 b\u1eaft g\u1eb7p thu\u1eadt ng\u1eef &#8220;B\u1ea3n ghi CNAME&#8221;? \u0110\u1eebng lo l\u1eafng n\u1ebfu b\u1ea1n ch\u01b0a r\u00f5 CNAME l\u00e0 g\u00ec. B\u1ea3n ghi n\u00e0y \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS), gi\u00fap li\u00ean k\u1ebft c\u00e1c d\u1ecbch v\u1ee5 v\u00e0 qu\u1ea3n l\u00fd t\u00ean mi\u1ec1n hi\u1ec7u qu\u1ea3 h\u01a1n. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u1ea3i th\u00edch chi ti\u1ebft CNAME record, c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ban-ghi-CNAME-la-gi\"><\/span>B\u1ea3n ghi CNAME l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/interdata.vn\/blog\/ban-ghi-cname-la-gi\/\">B\u1ea3n ghi CNAME<\/a> (Canonical Name) l\u00e0 m\u1ed9t lo\u1ea1i b\u1ea3n ghi trong H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS &#8211; <a href=\"https:\/\/interdata.vn\/blog\/dns-la-gi\/\">Domain Name System<\/a>). B\u1ea3n ghi n\u00e0y d\u00f9ng \u0111\u1ec3 \u00e1nh x\u1ea1 m\u1ed9t t\u00ean mi\u1ec1n ho\u1eb7c t\u00ean mi\u1ec1n ph\u1ee5 (g\u1ecdi l\u00e0 alias &#8211; b\u00ed danh) t\u1edbi m\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c (g\u1ecdi l\u00e0 t\u00ean ch\u00ednh t\u1eafc &#8211; canonical name).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME.jpg\" alt=\"B\u1ea3n ghi CNAME\" width=\"750\" height=\"500\" class=\"aligncenter size-full wp-image-27865\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-300x200.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea3n ghi CNAME gi\u1ed1ng nh\u01b0 m\u1ed9t &#8216;bi\u1ec7t danh&#8217; hay &#8216;t\u00ean g\u1ecdi kh\u00e1c&#8217;. Khi tr\u00ecnh duy\u1ec7t ho\u1eb7c h\u1ec7 th\u1ed1ng truy c\u1eadp v\u00e0o t\u00ean b\u00ed danh, h\u1ec7 th\u1ed1ng DNS s\u1ebd t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n h\u01b0\u1edbng \u0111\u1ebfn t\u00ean mi\u1ec1n ch\u00ednh t\u1eafc \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/p>\n<p>Kh\u00e1c v\u1edbi <a href=\"https:\/\/interdata.vn\/blog\/ban-ghi-a-la-gi\/\">B\u1ea3n ghi A<\/a> (A Record) tr\u1ecf tr\u1ef1c ti\u1ebfp m\u1ed9t t\u00ean mi\u1ec1n \u0111\u1ebfn m\u1ed9t <a href=\"https:\/\/interdata.vn\/blog\/dia-chi-ip-la-gi\/\">\u0111\u1ecba ch\u1ec9 IP<\/a> c\u1ee5 th\u1ec3, B\u1ea3n ghi CNAME l\u1ea1i tr\u1ecf m\u1ed9t t\u00ean (alias) \u0111\u1ebfn m\u1ed9t t\u00ean kh\u00e1c (canonical name).<\/p>\n<p>Trong c\u1ea5u h\u00ecnh CNAME:<\/p>\n<ul>\n<li><strong>Alias (B\u00ed danh):<\/strong> L\u00e0 t\u00ean b\u1ea1n mu\u1ed1n t\u1ea1o, v\u00ed d\u1ee5: <code><a href=\"https:\/\/interdata.vn\/blog\/world-wide-web\/\">www<\/a>.congtycuaban.com<\/code>.<\/li>\n<li><strong>Canonical Name (T\u00ean ch\u00ednh t\u1eafc):<\/strong> L\u00e0 t\u00ean mi\u1ec1n th\u1ef1c s\u1ef1 m\u00e0 alias tr\u1ecf t\u1edbi, v\u00ed d\u1ee5: <code>congtycuaban.com<\/code>.<\/li>\n<\/ul>\n<p>Khi ng\u01b0\u1eddi d\u00f9ng g\u00f5 <code>www.congtycuaban.com<\/code>, h\u1ec7 th\u1ed1ng DNS s\u1ebd t\u00ecm b\u1ea3n ghi CNAME, th\u1ea5y r\u1eb1ng t\u00ean mi\u1ec1n n\u00e0y tr\u1ecf \u0111\u1ebfn <code>congtycuaban.com<\/code>. Sau \u0111\u00f3, h\u1ec7 th\u1ed1ng ti\u1ebfp t\u1ee5c t\u00ecm b\u1ea3n ghi (th\u01b0\u1eddng l\u00e0 B\u1ea3n ghi A) c\u1ee7a <code>congtycuaban.com<\/code> \u0111\u1ec3 l\u1ea5y \u0111\u1ecba ch\u1ec9 IP <a href=\"https:\/\/interdata.vn\/blog\/may-chu-server-la-gi\/\">m\u00e1y ch\u1ee7<\/a>.<\/p>\n<p>Nh\u01b0 v\u1eady, CNAME ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t s\u1ef1 chuy\u1ec3n h\u01b0\u1edbng \u1edf c\u1ea5p \u0111\u1ed9 DNS. \u0110i\u1ec1u n\u00e0y r\u1ea5t h\u1eefu \u00edch khi b\u1ea1n mu\u1ed1n nhi\u1ec1u t\u00ean mi\u1ec1n ph\u1ee5 ho\u1eb7c t\u00ean mi\u1ec1n kh\u00e1c nhau c\u00f9ng tr\u1ecf v\u1ec1 m\u1ed9t \u0111\u00edch duy nh\u1ea5t m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i c\u1eadp nh\u1eadt \u0111\u1ecba ch\u1ec9 IP \u1edf nhi\u1ec1u n\u01a1i.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ban-ghi-CNAME-hoat-dong-nhu-the-nao-trong-DNS\"><\/span>B\u1ea3n ghi CNAME ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o trong DNS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n, ch\u00fang ta h\u00e3y xem x\u00e9t quy tr\u00ecnh ph\u00e2n gi\u1ea3i DNS khi c\u00f3 s\u1ef1 tham gia c\u1ee7a b\u1ea3n ghi CNAME. Qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra r\u1ea5t nhanh ch\u00f3ng ph\u00eda sau h\u1eadu tr\u01b0\u1eddng m\u1ed7i khi b\u1ea1n truy c\u1eadp m\u1ed9t website.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-01.jpg\" alt=\"B\u1ea3n ghi CNAME 01\" width=\"750\" height=\"269\" class=\"aligncenter size-full wp-image-27861\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-01.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-01-300x108.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<p>Gi\u1ea3 s\u1eed b\u1ea1n mu\u1ed1n truy c\u1eadp <code><a href=\"https:\/\/interdata.vn\/blog\/blog-la-gi\/\">blog<\/a>.doanhnghiep.vn<\/code>. T\u00ean mi\u1ec1n ph\u1ee5 <code>blog<\/code> n\u00e0y \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh b\u1eb1ng b\u1ea3n ghi CNAME tr\u1ecf \u0111\u1ebfn m\u1ed9t d\u1ecbch v\u1ee5 hosting blog b\u00ean ngo\u00e0i, v\u00ed d\u1ee5 <code>hostingblog.example.net<\/code>.<\/p>\n<ol>\n<li><strong><a href=\"https:\/\/interdata.vn\/blog\/query-la-gi\/\">Truy v\u1ea5n<\/a> ban \u0111\u1ea7u:<\/strong> Tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS resolver (th\u01b0\u1eddng l\u00e0 c\u1ee7a nh\u00e0 cung c\u1ea5p <a href=\"https:\/\/interdata.vn\/blog\/mang-internet\/\">Internet<\/a>) \u0111\u1ec3 t\u00ecm \u0111\u1ecba ch\u1ec9 IP cho <code>blog.doanhnghiep.vn<\/code>.<\/li>\n<li><strong>Ki\u1ec3m tra b\u1ea3n ghi:<\/strong> M\u00e1y ch\u1ee7 DNS resolver truy v\u1ea5n c\u00e1c m\u00e1y ch\u1ee7 DNS c\u00f3 th\u1ea9m quy\u1ec1n cho t\u00ean mi\u1ec1n <code>doanhnghiep.vn<\/code>. M\u00e1y ch\u1ee7 n\u00e0y tr\u1ea3 v\u1ec1 th\u00f4ng tin r\u1eb1ng <code>blog.doanhnghiep.vn<\/code> c\u00f3 m\u1ed9t b\u1ea3n ghi CNAME tr\u1ecf \u0111\u1ebfn <code>hostingblog.example.net<\/code>.<\/li>\n<li><strong>Truy v\u1ea5n m\u1edbi:<\/strong> Nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng tin CNAME, m\u00e1y ch\u1ee7 DNS resolver hi\u1ec3u r\u1eb1ng <code>blog.doanhnghiep.vn<\/code> ch\u1ec9 l\u00e0 m\u1ed9t b\u00ed danh. Resolver c\u1ea7n t\u00ecm \u0111\u1ecba ch\u1ec9 IP c\u1ee7a t\u00ean mi\u1ec1n ch\u00ednh t\u1eafc <code>hostingblog.example.net<\/code>. M\u1ed9t truy v\u1ea5n DNS m\u1edbi \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u cho t\u00ean mi\u1ec1n n\u00e0y.<\/li>\n<li><strong>T\u00ecm B\u1ea3n ghi A:<\/strong> Resolver ti\u1ebfp t\u1ee5c truy v\u1ea5n c\u00e1c m\u00e1y ch\u1ee7 DNS c\u00f3 th\u1ea9m quy\u1ec1n cho <code>hostingblog.example.net<\/code>. L\u1ea7n n\u00e0y, m\u00e1y ch\u1ee7 tr\u1ea3 v\u1ec1 B\u1ea3n ghi A ch\u1ee9a \u0111\u1ecba ch\u1ec9 IP th\u1ef1c s\u1ef1 c\u1ee7a m\u00e1y ch\u1ee7 hosting blog, v\u00ed d\u1ee5 <code>192.0.2.100<\/code>.<\/li>\n<li><strong>Tr\u1ea3 k\u1ebft qu\u1ea3:<\/strong> M\u00e1y ch\u1ee7 DNS resolver g\u1eedi \u0111\u1ecba ch\u1ec9 IP <code>192.0.2.100<\/code> v\u1ec1 cho tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n.<\/li>\n<li><strong>K\u1ebft n\u1ed1i:<\/strong> Tr\u00ecnh duy\u1ec7t s\u1eed d\u1ee5ng \u0111\u1ecba ch\u1ec9 IP n\u00e0y \u0111\u1ec3 k\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp \u0111\u1ebfn m\u00e1y ch\u1ee7 ch\u1ee9a blog v\u00e0 t\u1ea3i n\u1ed9i dung <a href=\"https:\/\/interdata.vn\/blog\/page-la-gi\/\">trang web<\/a>.<\/li>\n<\/ol>\n<p>To\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh n\u00e0y cho th\u1ea5y CNAME t\u1ea1o ra m\u1ed9t b\u01b0\u1edbc trung gian trong vi\u1ec7c tra c\u1ee9u DNS. Thay v\u00ec tr\u1ea3 v\u1ec1 IP ngay l\u1eadp t\u1ee9c nh\u01b0 B\u1ea3n ghi A, CNAME y\u00eau c\u1ea7u m\u1ed9t <a href=\"https:\/\/interdata.vn\/blog\/vong-lap-la-gi\/\">v\u00f2ng l\u1eb7p<\/a> truy v\u1ea5n m\u1edbi \u0111\u1ec3 t\u00ecm IP c\u1ee7a t\u00ean mi\u1ec1n ch\u00ednh t\u1eafc.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"So-sanh-ban-ghi-CNAME-va-ban-ghi-A-A-Record\"><\/span>So s\u00e1nh b\u1ea3n ghi CNAME v\u00e0 b\u1ea3n ghi A (A Record)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa CNAME v\u00e0 A Record l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 c\u1ea5u h\u00ecnh DNS ch\u00ednh x\u00e1c cho t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n. \u0110\u00e2y l\u00e0 hai lo\u1ea1i b\u1ea3n ghi ph\u1ed5 bi\u1ebfn nh\u1ea5t nh\u01b0ng ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch kh\u00e1c nhau.<\/p>\n<p>\u0110i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i n\u1eb1m \u1edf \u0111\u00edch \u0111\u1ebfn m\u00e0 ch\u00fang tr\u1ecf t\u1edbi:<\/p>\n<ul>\n<li><strong>B\u1ea3n ghi A (Address Record):<\/strong> Tr\u1ecf m\u1ed9t t\u00ean mi\u1ec1n (ho\u1eb7c t\u00ean mi\u1ec1n ph\u1ee5) tr\u1ef1c ti\u1ebfp \u0111\u1ebfn m\u1ed9t <strong>\u0111\u1ecba ch\u1ec9 IP phi\u00ean b\u1ea3n 4 (<a href=\"https:\/\/interdata.vn\/blog\/ipv4-la-gi\/\">IPv4<\/a>)<\/strong>.<\/li>\n<li><strong>B\u1ea3n ghi CNAME (Canonical Name Record):<\/strong> Tr\u1ecf m\u1ed9t t\u00ean mi\u1ec1n (ho\u1eb7c t\u00ean mi\u1ec1n ph\u1ee5 &#8211; alias) \u0111\u1ebfn m\u1ed9t <strong>t\u00ean mi\u1ec1n kh\u00e1c<\/strong> (canonical name).<\/li>\n<\/ul>\n<p>H\u00e3y xem b\u1ea3ng so s\u00e1nh nhanh d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n<figure class=\"table\">\n<table>\n<thead>\n<tr>\n<th>\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th>B\u1ea3n ghi A (A Record)<\/th>\n<th>B\u1ea3n ghi CNAME (CNAME Record)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u00edch \u0111\u1ebfn<\/strong><\/td>\n<td>\u0110\u1ecba ch\u1ec9 IPv4 (V\u00ed d\u1ee5: 192.0.2.1)<\/td>\n<td>T\u00ean mi\u1ec1n kh\u00e1c (V\u00ed d\u1ee5: example.com)<\/td>\n<\/tr>\n<tr>\n<td><strong>M\u1ee5c \u0111\u00edch<\/strong><\/td>\n<td>Li\u00ean k\u1ebft t\u00ean mi\u1ec1n v\u1edbi <a href=\"https:\/\/interdata.vn\/blog\/server-vat-ly-la-gi\/\">m\u00e1y ch\u1ee7 v\u1eadt l\u00fd<\/a><\/td>\n<td>T\u1ea1o b\u00ed danh, tr\u1ecf \u0111\u1ebfn d\u1ecbch v\u1ee5 b\u00ean ngo\u00e0i<\/td>\n<\/tr>\n<tr>\n<td><strong>T\u00ean mi\u1ec1n g\u1ed1c<\/strong><\/td>\n<td><strong>C\u00f3 th\u1ec3<\/strong> s\u1eed d\u1ee5ng cho t\u00ean mi\u1ec1n g\u1ed1c<\/td>\n<td><strong>Kh\u00f4ng n\u00ean\/Kh\u00f4ng th\u1ec3<\/strong> (theo chu\u1ea9n RFC)<\/td>\n<\/tr>\n<tr>\n<td><strong>Hi\u1ec7u su\u1ea5t<\/strong><\/td>\n<td>Tra c\u1ee9u tr\u1ef1c ti\u1ebfp, nhanh h\u01a1n<\/td>\n<td>Th\u00eam b\u01b0\u1edbc tra c\u1ee9u, ch\u1eadm h\u01a1n m\u1ed9t ch\u00fat<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Khi-nao-nen-su-dung-ban-ghi-CNAME\"><\/span>Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>B\u1ea1n n\u00ean c\u00e2n nh\u1eafc s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p sau:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/interdata.vn\/blog\/cach-tro-ten-mien-ve-hosting\/\">Tr\u1ecf t\u00ean mi\u1ec1n<\/a> ph\u1ee5 \u0111\u1ebfn d\u1ecbch v\u1ee5 b\u00ean th\u1ee9 ba:<\/strong> Khi b\u1ea1n s\u1eed d\u1ee5ng c\u00e1c n\u1ec1n t\u1ea3ng nh\u01b0 Shopify, Heroku, Blogger, Google Sites, CDN (<a href=\"https:\/\/interdata.vn\/blog\/cdn-la-gi\/\">Content Delivery Network<\/a>), ho\u1eb7c nh\u00e0 cung c\u1ea5p email y\u00eau c\u1ea7u b\u1ea1n tr\u1ecf t\u00ean mi\u1ec1n ph\u1ee5 c\u1ee7a m\u00ecnh \u0111\u1ebfn d\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd. H\u1ecd th\u01b0\u1eddng cung c\u1ea5p m\u1ed9t t\u00ean mi\u1ec1n \u0111\u00edch (canonical name) \u0111\u1ec3 b\u1ea1n c\u1ea5u h\u00ecnh CNAME.<\/li>\n<li><strong>T\u1ea1o b\u00ed danh cho t\u00ean mi\u1ec1n ph\u1ee5:<\/strong> V\u00ed d\u1ee5, b\u1ea1n mu\u1ed1n c\u1ea3 <code><a href=\"https:\/\/interdata.vn\/blog\/ftp-la-gi\/\">ftp<\/a>.congty.com<\/code> v\u00e0 <code>files.congty.com<\/code> c\u00f9ng tr\u1ecf \u0111\u1ebfn m\u1ed9t m\u00e1y ch\u1ee7 FTP ch\u00ednh c\u00f3 t\u00ean <code>serverftp.congty.com<\/code>. B\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o CNAME cho <code>ftp<\/code> v\u00e0 <code>files<\/code> tr\u1ecf \u0111\u1ebfn <code>serverftp<\/code>.<\/li>\n<li><strong>T\u1ea1o b\u00ed danh WWW:<\/strong> M\u1ed9t \u1ee9ng d\u1ee5ng r\u1ea5t ph\u1ed5 bi\u1ebfn l\u00e0 t\u1ea1o CNAME cho <code>www.tenmien.com<\/code> tr\u1ecf \u0111\u1ebfn <code>tenmien.com<\/code>. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp b\u1eb1ng <code>www<\/code> hay kh\u00f4ng c\u00f3 <code>www<\/code> \u0111\u1ec1u \u0111\u1ebfn c\u00f9ng m\u1ed9t website. (L\u01b0u \u00fd: M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng d\u00f9ng A Record cho c\u1ea3 hai).<\/li>\n<li><strong>Khi \u0111\u1ecba ch\u1ec9 IP \u0111\u00edch c\u00f3 th\u1ec3 thay \u0111\u1ed5i:<\/strong> N\u1ebfu b\u1ea1n tr\u1ecf \u0111\u1ebfn m\u1ed9t d\u1ecbch v\u1ee5 m\u00e0 \u0111\u1ecba ch\u1ec9 IP c\u1ee7a h\u1ecd c\u00f3 th\u1ec3 thay \u0111\u1ed5i nh\u01b0ng t\u00ean mi\u1ec1n d\u1ecbch v\u1ee5 th\u00ec kh\u00f4ng \u0111\u1ed5i, CNAME l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1t. B\u1ea1n kh\u00f4ng c\u1ea7n c\u1eadp nh\u1eadt IP th\u1ee7 c\u00f4ng.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Khi-nao-nen-su-dung-ban-ghi-A\"><\/span>Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng b\u1ea3n ghi A?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>B\u1ea3n ghi A l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p khi:<\/p>\n<ul>\n<li><strong>Tr\u1ecf t\u00ean mi\u1ec1n ch\u00ednh (g\u1ed1c\/apex domain) \u0111\u1ebfn m\u00e1y ch\u1ee7:<\/strong> V\u00ed d\u1ee5, b\u1ea1n mu\u1ed1n <code>tenmien.com<\/code> tr\u1ecf \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 IP <code>192.0.2.1<\/code> c\u1ee7a m\u00e1y ch\u1ee7 hosting website. T\u00ean mi\u1ec1n g\u1ed1c kh\u00f4ng n\u00ean d\u00f9ng CNAME.<\/li>\n<li><strong>Tr\u1ecf t\u00ean mi\u1ec1n ph\u1ee5 \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 IP c\u1ee5 th\u1ec3:<\/strong> Khi b\u1ea1n c\u00f3 m\u1ed9t m\u00e1y ch\u1ee7 v\u1edbi <a href=\"https:\/\/interdata.vn\/blog\/ip-tinh\/\">IP t\u0129nh<\/a> v\u00e0 mu\u1ed1n tr\u1ecf tr\u1ef1c ti\u1ebfp m\u1ed9t <a href=\"https:\/\/interdata.vn\/blog\/subdomain-la-gi\/\">subdomain<\/a> (v\u00ed d\u1ee5: <code>mail.tenmien.com<\/code>) \u0111\u1ebfn IP \u0111\u00f3.<\/li>\n<li><strong>Y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t tra c\u1ee9u DNS nhanh nh\u1ea5t:<\/strong> V\u00ec B\u1ea3n ghi A ph\u00e2n gi\u1ea3i tr\u1ef1c ti\u1ebfp ra IP, qu\u00e1 tr\u00ecnh tra c\u1ee9u th\u01b0\u1eddng nhanh h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi CNAME.<\/li>\n<\/ul>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u00fang lo\u1ea1i b\u1ea3n ghi DNS \u0111\u1ea3m b\u1ea3o t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh v\u00e0 ch\u00ednh x\u00e1c theo m\u1ee5c \u0111\u00edch mong mu\u1ed1n.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-truong-hop-su-dung-ban-ghi-CNAME-pho-bien-nhat\"><\/span>C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME ph\u1ed5 bi\u1ebfn nh\u1ea5t<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>B\u1ea3n ghi CNAME r\u1ea5t linh ho\u1ea1t v\u00e0 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf khi qu\u1ea3n l\u00fd t\u00ean mi\u1ec1n v\u00e0 d\u1ecbch v\u1ee5 web. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c v\u00ed d\u1ee5 c\u1ee5 th\u1ec3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-02.jpg\" alt=\"B\u1ea3n ghi CNAME 02\" width=\"750\" height=\"406\" class=\"aligncenter size-full wp-image-27862\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-02.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-02-300x162.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tao-bi-danh-cho-WWW-www-alias\"><\/span>T\u1ea1o b\u00ed danh cho WWW (www alias)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng c\u1ed5 \u0111i\u1ec3n v\u00e0 ph\u1ed5 bi\u1ebfn nh\u1ea5t. Nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng quen g\u00f5 <code>www.<\/code> tr\u01b0\u1edbc t\u00ean mi\u1ec1n. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o c\u1ea3 <code>www.tenmien.com<\/code> v\u00e0 <code>tenmien.com<\/code> \u0111\u1ec1u d\u1eabn \u0111\u1ebfn c\u00f9ng m\u1ed9t website, b\u1ea1n c\u00f3 th\u1ec3:<\/p>\n<ul>\n<li>T\u1ea1o B\u1ea3n ghi A cho <code>tenmien.com<\/code> tr\u1ecf \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 IP c\u1ee7a hosting.<\/li>\n<li>T\u1ea1o B\u1ea3n ghi CNAME cho <code>www<\/code> tr\u1ecf \u0111\u1ebfn <code>tenmien.com<\/code>.<\/li>\n<\/ul>\n<p>Nh\u01b0 v\u1eady, d\u00f9 ng\u01b0\u1eddi d\u00f9ng g\u00f5 c\u00e1ch n\u00e0o, h\u1ecd \u0111\u1ec1u \u0111\u01b0\u1ee3c ph\u00e2n gi\u1ea3i \u0111\u1ebfn c\u00f9ng \u0111\u1ecba ch\u1ec9 IP th\u00f4ng qua t\u00ean mi\u1ec1n g\u1ed1c.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tro-ten-mien-phu-Subdomain-den-dich-vu-ben-ngoai\"><\/span>Tr\u1ecf t\u00ean mi\u1ec1n ph\u1ee5 (Subdomain) \u0111\u1ebfn d\u1ecbch v\u1ee5 b\u00ean ngo\u00e0i<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng CNAME c\u1ef1c k\u1ef3 ph\u1ed5 bi\u1ebfn hi\u1ec7n nay, khi nhi\u1ec1u doanh nghi\u1ec7p t\u00edch h\u1ee3p c\u00e1c d\u1ecbch v\u1ee5 \u0111\u00e1m m\u00e2y.<\/p>\n<ul>\n<li><strong>Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed:<\/strong> N\u1ebfu b\u1ea1n d\u00f9ng Shopify v\u00e0 mu\u1ed1n c\u00f3 c\u1eeda h\u00e0ng t\u1ea1i <code>shop.doanhnghiep.com<\/code>, Shopify s\u1ebd y\u00eau c\u1ea7u b\u1ea1n t\u1ea1o CNAME cho <code>shop<\/code> tr\u1ecf \u0111\u1ebfn <code>shops.myshopify.com<\/code>.<\/li>\n<li><strong>Blog:<\/strong> S\u1eed d\u1ee5ng Blogger hay Medium t\u1ea1i <code>blog.doanhnghiep.com<\/code>? B\u1ea1n s\u1ebd c\u1ea7n t\u1ea1o CNAME tr\u1ecf \u0111\u1ebfn t\u00ean mi\u1ec1n do n\u1ec1n t\u1ea3ng \u0111\u00f3 cung c\u1ea5p, v\u00ed d\u1ee5 <code>ghs.google.com<\/code> cho Blogger.<\/li>\n<li><strong>Email Marketing:<\/strong> C\u00e1c d\u1ecbch v\u1ee5 nh\u01b0 SendGrid, Mailgun c\u00f3 th\u1ec3 y\u00eau c\u1ea7u t\u1ea1o CNAME cho subdomain tracking (v\u00ed d\u1ee5 <code>email.doanhnghiep.com<\/code>) \u0111\u1ec3 qu\u1ea3n l\u00fd danh ti\u1ebfng g\u1eedi email.<\/li>\n<li><strong>CDN (Content Delivery Network):<\/strong> \u0110\u1ec3 t\u0103ng t\u1ed1c website, b\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng CDN nh\u01b0 <a href=\"https:\/\/interdata.vn\/blog\/cloudflare-la-gi\/\">Cloudflare<\/a>, Akamai. H\u1ecd th\u01b0\u1eddng y\u00eau c\u1ea7u t\u1ea1o CNAME cho t\u00e0i nguy\u00ean t\u0129nh (v\u00ed d\u1ee5 <code>static.doanhnghiep.com<\/code>) tr\u1ecf \u0111\u1ebfn t\u00ean mi\u1ec1n c\u1ee7a CDN.<\/li>\n<li><strong>Platform as a Service (<a href=\"https:\/\/interdata.vn\/blog\/mo-hinh-saas-paas-va-iaas\/\">PaaS<\/a>):<\/strong> C\u00e1c n\u1ec1n t\u1ea3ng nh\u01b0 Heroku, Netlify, Vercel th\u01b0\u1eddng y\u00eau c\u1ea7u CNAME \u0111\u1ec3 tr\u1ecf t\u00ean mi\u1ec1n t\u00f9y ch\u1ec9nh \u0111\u1ebfn \u1ee9ng d\u1ee5ng b\u1ea1n tri\u1ec3n khai tr\u00ean \u0111\u00f3.<\/li>\n<\/ul>\n<p>Trong m\u1ecdi tr\u01b0\u1eddng h\u1ee3p n\u00e0y, CNAME gi\u00fap b\u1ea1n s\u1eed d\u1ee5ng t\u00ean mi\u1ec1n ph\u1ee5 mang th\u01b0\u01a1ng hi\u1ec7u c\u1ee7a m\u00ecnh nh\u01b0ng th\u1ef1c ch\u1ea5t tr\u1ecf \u0111\u1ebfn h\u1ea1 t\u1ea7ng c\u1ee7a nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Xac-thuc-quyen-so-huu-ten-mien-Domain-Verification\"><\/span>X\u00e1c th\u1ef1c quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n (Domain Verification)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nhi\u1ec1u d\u1ecbch v\u1ee5 tr\u1ef1c tuy\u1ebfn y\u00eau c\u1ea7u b\u1ea1n ch\u1ee9ng minh m\u00ecnh l\u00e0 ch\u1ee7 s\u1edf h\u1eefu h\u1ee3p ph\u00e1p c\u1ee7a t\u00ean mi\u1ec1n tr\u01b0\u1edbc khi cho ph\u00e9p s\u1eed d\u1ee5ng c\u00e1c t\u00ednh n\u0103ng li\u00ean quan.<\/p>\n<ul>\n<li><strong>Google Workspace \/ Microsoft 365:<\/strong> Khi \u0111\u0103ng k\u00fd email theo t\u00ean mi\u1ec1n ri\u00eang, b\u1ea1n th\u01b0\u1eddng ph\u1ea3i t\u1ea1o m\u1ed9t b\u1ea3n ghi CNAME (ho\u1eb7c TXT) \u0111\u1eb7c bi\u1ec7t do Google\/Microsoft cung c\u1ea5p. H\u1ecd s\u1ebd ki\u1ec3m tra s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a b\u1ea3n ghi n\u00e0y \u0111\u1ec3 x\u00e1c th\u1ef1c. V\u00ed d\u1ee5: T\u1ea1o CNAME <code>google._domainkey<\/code> tr\u1ecf \u0111\u1ebfn <code>gv-XYZ.domainverify.googlehosted.com<\/code>.<\/li>\n<li><strong>Facebook Business:<\/strong> \u0110\u1ec3 x\u00e1c minh t\u00ean mi\u1ec1n cho vi\u1ec7c qu\u1ea3n l\u00fd qu\u1ea3ng c\u00e1o pixel ho\u1eb7c catalog, Facebook c\u0169ng c\u00f3 th\u1ec3 y\u00eau c\u1ea7u t\u1ea1o CNAME.<\/li>\n<li><strong><a href=\"https:\/\/interdata.vn\/blog\/chung-chi-ssl\/\">Ch\u1ee9ng ch\u1ec9 SSL<\/a>:<\/strong> M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p x\u00e1c th\u1ef1c t\u00ean mi\u1ec1n \u0111\u1ec3 c\u1ea5p ch\u1ee9ng ch\u1ec9 SSL (Secure Sockets Layer) c\u0169ng d\u1ef1a tr\u00ean vi\u1ec7c t\u1ea1o CNAME.<\/li>\n<\/ul>\n<p>B\u1ea3n ghi CNAME trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t &#8220;ch\u1eef k\u00fd s\u1ed1&#8221; t\u1ea1m th\u1eddi tr\u00ean DNS c\u1ee7a b\u1ea1n, ch\u1ec9 ch\u1ee7 s\u1edf h\u1eefu t\u00ean mi\u1ec1n m\u1edbi c\u00f3 th\u1ec3 t\u1ea1o \u0111\u01b0\u1ee3c.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Huong-dan-co-ban-ve-tao-va-quan-ly-ban-ghi-CNAME\"><\/span>H\u01b0\u1edbng d\u1eabn c\u01a1 b\u1ea3n v\u1ec1 t\u1ea1o v\u00e0 qu\u1ea3n l\u00fd b\u1ea3n ghi CNAME<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c t\u1ea1o v\u00e0 qu\u1ea3n l\u00fd b\u1ea3n ghi CNAME th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u00f4ng qua giao di\u1ec7n qu\u1ea3n l\u00fd DNS c\u1ee7a nh\u00e0 cung c\u1ea5p t\u00ean mi\u1ec1n ho\u1eb7c nh\u00e0 cung c\u1ea5p hosting c\u1ee7a b\u1ea1n. C\u00e1c b\u01b0\u1edbc c\u01a1 b\u1ea3n t\u01b0\u01a1ng t\u1ef1 nhau tr\u00ean h\u1ea7u h\u1ebft c\u00e1c n\u1ec1n t\u1ea3ng.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-03.jpg\" alt=\"B\u1ea3n ghi CNAME 03\" width=\"750\" height=\"474\" class=\"aligncenter size-full wp-image-27863\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-03.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-03-300x190.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<p>B\u1ea1n c\u1ea7n truy c\u1eadp v\u00e0o khu v\u1ef1c qu\u1ea3n l\u00fd DNS (DNS Management, Zone Editor, Advanced DNS settings&#8230;). V\u1ecb tr\u00ed n\u00e0y c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y nh\u00e0 cung c\u1ea5p:<\/p>\n<ul>\n<li><strong>Nh\u00e0 cung c\u1ea5p t\u00ean mi\u1ec1n:<\/strong> N\u1ebfu b\u1ea1n ch\u1ec9 mua t\u00ean mi\u1ec1n (v\u00ed d\u1ee5: GoDaddy, Namecheap, M\u1eaft B\u00e3o, PA Vietnam), khu v\u1ef1c qu\u1ea3n l\u00fd DNS th\u01b0\u1eddng n\u1eb1m trong t\u00e0i kho\u1ea3n qu\u1ea3n l\u00fd t\u00ean mi\u1ec1n.<\/li>\n<li><strong>Nh\u00e0 cung c\u1ea5p hosting:<\/strong> N\u1ebfu b\u1ea1n mua g\u00f3i hosting \u0111i k\u00e8m qu\u1ea3n l\u00fd DNS (v\u00ed d\u1ee5: s\u1eed d\u1ee5ng <a href=\"https:\/\/interdata.vn\/blog\/cpanel\/\">cPanel<\/a>, <a href=\"https:\/\/interdata.vn\/blog\/plesk-la-gi\/\">Plesk<\/a>, <a href=\"https:\/\/interdata.vn\/blog\/directadmin-la-gi\/\">DirectAdmin<\/a>), b\u1ea1n s\u1ebd t\u00ecm th\u1ea5y tr\u00ecnh qu\u1ea3n l\u00fd DNS trong <a href=\"https:\/\/interdata.vn\/blog\/hosting-control-panel\/\">control panel hosting<\/a>.<\/li>\n<li><strong>D\u1ecbch v\u1ee5 DNS b\u00ean th\u1ee9 ba:<\/strong> N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng d\u1ecbch v\u1ee5 DNS chuy\u00ean bi\u1ec7t nh\u01b0 Cloudflare, VNG Cloud DNS, Viettel Cloud DNS, b\u1ea1n s\u1ebd qu\u1ea3n l\u00fd b\u1ea3n ghi t\u1ea1i giao di\u1ec7n c\u1ee7a d\u1ecbch v\u1ee5 \u0111\u00f3.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Cac-thong-tin-can-nhap-khi-tao-CNAME\"><\/span>C\u00e1c th\u00f4ng tin c\u1ea7n nh\u1eadp khi t\u1ea1o CNAME<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi t\u1ea1o m\u1ed9t b\u1ea3n ghi CNAME m\u1edbi, b\u1ea1n th\u01b0\u1eddng c\u1ea7n cung c\u1ea5p c\u00e1c th\u00f4ng tin sau:<\/p>\n<ul>\n<li><strong>Lo\u1ea1i B\u1ea3n ghi (Record Type):<\/strong> Ch\u1ecdn <code>CNAME<\/code> t\u1eeb danh s\u00e1ch c\u00e1c lo\u1ea1i b\u1ea3n ghi (A, MX, TXT&#8230;).<\/li>\n<li><strong>T\u00ean\/Host\/Alias (Name\/Host\/Alias):<\/strong> \u0110\u00e2y l\u00e0 ph\u1ea7n t\u00ean mi\u1ec1n ph\u1ee5 b\u1ea1n mu\u1ed1n t\u1ea1o b\u00ed danh. B\u1ea1n ch\u1ec9 c\u1ea7n nh\u1eadp ph\u1ea7n t\u00ean mi\u1ec1n ph\u1ee5 \u0111\u00f3. V\u00ed d\u1ee5: n\u1ebfu mu\u1ed1n t\u1ea1o <code>blog.tenmien.com<\/code>, b\u1ea1n ch\u1ec9 c\u1ea7n nh\u1eadp <code>blog<\/code>. N\u1ebfu mu\u1ed1n t\u1ea1o cho <code>www.tenmien.com<\/code>, b\u1ea1n nh\u1eadp <code>www<\/code>. M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng y\u00eau c\u1ea7u nh\u1eadp \u0111\u1ea7y \u0111\u1ee7 <code>blog.tenmien.com.<\/code>. H\u00e3y \u0111\u1ecdc k\u1ef9 h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 cung c\u1ea5p.<\/li>\n<li><strong>Gi\u00e1 tr\u1ecb\/Tr\u1ecf \u0111\u1ebfn\/T\u00ean ch\u00ednh t\u1eafc (Value\/Points to\/Canonical Name):<\/strong> \u0110\u00e2y l\u00e0 t\u00ean mi\u1ec1n \u0111\u00edch m\u00e0 b\u1ea1n mu\u1ed1n b\u00ed danh tr\u1ecf t\u1edbi. V\u00ed d\u1ee5: <code>tenmien.com<\/code>, <code>shops.myshopify.com<\/code>, <code>ghs.google.com<\/code>. <strong>Quan tr\u1ecdng:<\/strong> Gi\u00e1 tr\u1ecb n\u00e0y ph\u1ea3i l\u00e0 m\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c, kh\u00f4ng ph\u1ea3i \u0111\u1ecba ch\u1ec9 IP.<\/li>\n<li><strong>TTL (<a href=\"https:\/\/interdata.vn\/blog\/ttl-la-gi\/\">Time To Live<\/a>):<\/strong> \u0110\u00e2y l\u00e0 th\u1eddi gian (t\u00ednh b\u1eb1ng gi\u00e2y) m\u00e0 c\u00e1c m\u00e1y ch\u1ee7 DNS kh\u00e1c \u0111\u01b0\u1ee3c ph\u00e9p l\u01b0u tr\u1eef cache (<a href=\"https:\/\/interdata.vn\/blog\/bo-nho-dem-la-gi\/\">b\u1ed9 nh\u1edb \u0111\u1ec7m<\/a>) th\u00f4ng tin c\u1ee7a b\u1ea3n ghi n\u00e0y. Gi\u00e1 tr\u1ecb TTL th\u1ea5p (v\u00ed d\u1ee5: 300 gi\u00e2y = 5 ph\u00fat) gi\u00fap thay \u0111\u1ed5i c\u1eadp nh\u1eadt nhanh h\u01a1n. Gi\u00e1 tr\u1ecb cao (v\u00ed d\u1ee5: 86400 gi\u00e2y = 24 gi\u1edd) gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7 DNS nh\u01b0ng thay \u0111\u1ed5i s\u1ebd l\u00e2u c\u1eadp nh\u1eadt h\u01a1n. Gi\u00e1 tr\u1ecb ph\u1ed5 bi\u1ebfn th\u01b0\u1eddng l\u00e0 3600 (1 gi\u1edd) ho\u1eb7c 14400 (4 gi\u1edd).<\/li>\n<\/ul>\n<p>Sau khi \u0111i\u1ec1n \u0111\u1ea7y \u0111\u1ee7 th\u00f4ng tin, h\u00e3y l\u01b0u l\u1ea1i c\u1ea5u h\u00ecnh.<\/p>\n<p>V\u1eadn h\u00e0nh website \u1ed5n \u0111\u1ecbnh sau khi c\u1ea5u h\u00ecnh DNS nh\u01b0 CNAME \u0111\u00f2i h\u1ecfi hosting ch\u1ea5t l\u01b0\u1ee3ng. C\u00e2n nh\u1eafc d\u1ecbch v\u1ee5 <span style=\"color: #ff00ff;\"><strong><a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/interdata.vn\/thue-hosting\/\" style=\"color: #ff00ff;\">thu\u00ea Hosting<\/a><\/strong><\/span> t\u1ea1i InterData ch\u1ec9 t\u1eeb 1K\/ng\u00e0y. Tr\u1ea3i nghi\u1ec7m t\u1ed1c \u0111\u1ed9 cao, c\u1ea5u h\u00ecnh m\u1ea1nh m\u1ebd t\u1eeb ph\u1ea7n c\u1ee9ng chuy\u00ean d\u1ee5ng <a href=\"https:\/\/interdata.vn\/blog\/cpu-amd-epyc\/\">AMD EPYC<\/a> Gen 3th, SSD NVMe U.2, c\u00f9ng <a href=\"https:\/\/interdata.vn\/blog\/bang-thong-la-gi\/\">b\u0103ng th\u00f4ng<\/a>, dung l\u01b0\u1ee3ng t\u1ed1i \u01b0u tr\u00ean n\u1ec1n t\u1ea3ng uy t\u00edn, \u1ed5n \u0111\u1ecbnh cao c\u1ea5p.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cach-kiem-tra-ban-ghi-CNAME-da-hoat-dong-chua\"><\/span>C\u00e1ch ki\u1ec3m tra b\u1ea3n ghi CNAME \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng ch\u01b0a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sau khi t\u1ea1o ho\u1eb7c thay \u0111\u1ed5i b\u1ea3n ghi CNAME, b\u1ea1n c\u1ea7n \u0111\u1ee3i m\u1ed9t kho\u1ea3ng th\u1eddi gian \u0111\u1ec3 thay \u0111\u1ed5i \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt tr\u00ean to\u00e0n h\u1ec7 th\u1ed1ng DNS to\u00e0n c\u1ea7u. Th\u1eddi gian n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o gi\u00e1 tr\u1ecb TTL b\u1ea1n \u0111\u00e3 \u0111\u1eb7t v\u00e0 t\u1ed1c \u0111\u1ed9 c\u1eadp nh\u1eadt c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7 DNS trung gian.<\/p>\n<p>\u0110\u1ec3 ki\u1ec3m tra, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 online nh\u01b0:<\/p>\n<ul>\n<li><strong>DNSChecker.org:<\/strong> Truy c\u1eadp website n\u00e0y, nh\u1eadp t\u00ean mi\u1ec1n ph\u1ee5 b\u1ea1n v\u1eeba t\u1ea1o CNAME (v\u00ed d\u1ee5: <code>blog.tenmien.com<\/code>), ch\u1ecdn lo\u1ea1i b\u1ea3n ghi l\u00e0 <code>CNAME<\/code> v\u00e0 nh\u1ea5n &#8220;Search&#8221;. C\u00f4ng c\u1ee5 s\u1ebd hi\u1ec3n th\u1ecb k\u1ebft qu\u1ea3 t\u1eeb c\u00e1c m\u00e1y ch\u1ee7 DNS \u1edf nhi\u1ec1u \u0111\u1ecba \u0111i\u1ec3m kh\u00e1c nhau, cho b\u1ea1n bi\u1ebft li\u1ec7u ch\u00fang \u0111\u00e3 c\u1eadp nh\u1eadt \u0111\u00fang t\u00ean mi\u1ec1n ch\u00ednh t\u1eafc (Canonical Name) b\u1ea1n c\u1ea5u h\u00ecnh hay ch\u01b0a.<\/li>\n<li><strong>Google Admin Toolbox (Dig):<\/strong> M\u1ed9t c\u00f4ng c\u1ee5 kh\u00e1c c\u1ee7a Google cho ph\u00e9p b\u1ea1n th\u1ef1c hi\u1ec7n truy v\u1ea5n DNS chi ti\u1ebft.<\/li>\n<\/ul>\n<p>B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 d\u00f9ng l\u1ec7nh tr\u00ean m\u00e1y t\u00ednh:<\/p>\n<ul>\n<li><strong>Windows:<\/strong> M\u1edf Command Prompt, g\u00f5 <code>nslookup -type=CNAME tenmienphu.tenmien.com<\/code><\/li>\n<li><strong>macOS\/Linux:<\/strong> M\u1edf Terminal, g\u00f5 <code>dig CNAME tenmienphu.tenmien.com<\/code><\/li>\n<\/ul>\n<p>N\u1ebfu k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 \u0111\u00fang t\u00ean mi\u1ec1n ch\u00ednh t\u1eafc b\u1ea1n \u0111\u00e3 c\u1ea5u h\u00ecnh, ngh\u0129a l\u00e0 b\u1ea3n ghi CNAME \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng. N\u1ebfu ch\u01b0a, h\u00e3y \u0111\u1ee3i th\u00eam ho\u1eb7c ki\u1ec3m tra l\u1ea1i c\u1ea5u h\u00ecnh TTL.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Nhung-luu-y-quan-trong-khi-su-dung-ban-ghi-CNAME\"><\/span>Nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng b\u1ea3n ghi CNAME<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>M\u1eb7c d\u00f9 h\u1eefu \u00edch, vi\u1ec7c s\u1eed d\u1ee5ng CNAME c\u0169ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf v\u00e0 \u0111i\u1ec3m c\u1ea7n l\u01b0u \u00fd \u0111\u1ec3 tr\u00e1nh c\u00e1c v\u1ea5n \u0111\u1ec1 kh\u00f4ng mong mu\u1ed1n.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-04.jpg\" alt=\"B\u1ea3n ghi CNAME 04\" width=\"750\" height=\"371\" class=\"aligncenter size-full wp-image-27864\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-04.jpg 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Ban-ghi-CNAME-04-300x148.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Han-che-tao-CNAME-tai-ten-mien-goc-Apex-DomainRoot-Domain\"><\/span>H\u1ea1n ch\u1ebf t\u1ea1o CNAME t\u1ea1i t\u00ean mi\u1ec1n g\u1ed1c (Apex Domain\/Root Domain)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t h\u1ea1n ch\u1ebf k\u1ef9 thu\u1eadt quan tr\u1ecdng. Theo ti\u00eau chu\u1ea9n DNS (RFC 1034, RFC 1912), b\u1ea1n <strong>kh\u00f4ng n\u00ean<\/strong> t\u1ea1o b\u1ea3n ghi CNAME cho t\u00ean mi\u1ec1n g\u1ed1c (v\u00ed d\u1ee5: <code>tenmien.com<\/code>).<\/p>\n<p>L\u00fd do l\u00e0 t\u00ean mi\u1ec1n g\u1ed1c ph\u1ea3i c\u00f3 c\u00e1c b\u1ea3n ghi DNS thi\u1ebft y\u1ebfu kh\u00e1c nh\u01b0 SOA (Start of Authority) v\u00e0 NS (<a href=\"https:\/\/interdata.vn\/blog\/name-server-la-gi\/\">Name Server<\/a>). N\u1ebfu b\u1ea1n t\u1ea1o CNAME cho t\u00ean mi\u1ec1n g\u1ed1c, c\u00e1c b\u1ea3n ghi n\u00e0y s\u1ebd kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i c\u00f9ng l\u00fac, g\u00e2y xung \u0111\u1ed9t v\u00e0 l\u00e0m h\u1ec7 th\u1ed1ng DNS ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng ch\u00ednh x\u00e1c.<\/p>\n<p>N\u1ebfu b\u1ea1n th\u1ef1c s\u1ef1 c\u1ea7n tr\u1ecf t\u00ean mi\u1ec1n g\u1ed1c \u0111\u1ebfn m\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c (v\u00ed d\u1ee5: tr\u1ecf <code>tenmien.com<\/code> v\u1ec1 <code>www.tenmien.com<\/code>), h\u00e3y t\u00ecm gi\u1ea3i ph\u00e1p kh\u00e1c:<\/p>\n<ul>\n<li><strong>Chuy\u1ec3n h\u01b0\u1edbng HTTP (HTTP Redirect):<\/strong> C\u1ea5u h\u00ecnh <a href=\"https:\/\/interdata.vn\/blog\/web-server\/\">web server<\/a> c\u1ee7a b\u1ea1n \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n h\u01b0\u1edbng 301 t\u1eeb <code>tenmien.com<\/code> sang <code>www.tenmien.com<\/code>. \u0110\u00e2y l\u00e0 c\u00e1ch ph\u1ed5 bi\u1ebfn v\u00e0 t\u1ed1t cho <a href=\"https:\/\/interdata.vn\/blog\/seo-la-gi\/\">SEO<\/a>.<\/li>\n<li><strong>B\u1ea3n ghi ALIAS\/ANAME:<\/strong> M\u1ed9t s\u1ed1 nh\u00e0 cung c\u1ea5p DNS hi\u1ec7n \u0111\u1ea1i (nh\u01b0 Cloudflare, DNSimple, VNG Cloud DNS) h\u1ed7 tr\u1ee3 lo\u1ea1i b\u1ea3n ghi kh\u00f4ng ch\u00ednh th\u1ee9c g\u1ecdi l\u00e0 ALIAS ho\u1eb7c ANAME. B\u1ea3n ghi n\u00e0y ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u1ef1 CNAME nh\u01b0ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u1edf t\u00ean mi\u1ec1n g\u1ed1c, v\u00ec ch\u00fang ph\u00e2n gi\u1ea3i ra \u0111\u1ecba ch\u1ec9 IP \u1edf ph\u00eda m\u00e1y ch\u1ee7 DNS thay v\u00ec tr\u1ea3 v\u1ec1 t\u00ean mi\u1ec1n kh\u00e1c cho client.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Anh-huong-tiem-an-den-hieu-suat-truy-van-DNS\"><\/span>\u1ea2nh h\u01b0\u1edfng ti\u1ec1m \u1ea9n \u0111\u1ebfn hi\u1ec7u su\u1ea5t truy v\u1ea5n DNS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nh\u01b0 \u0111\u00e3 gi\u1ea3i th\u00edch \u1edf ph\u1ea7n c\u00e1ch ho\u1ea1t \u0111\u1ed9ng, CNAME y\u00eau c\u1ea7u th\u00eam \u00edt nh\u1ea5t m\u1ed9t b\u01b0\u1edbc tra c\u1ee9u DNS so v\u1edbi B\u1ea3n ghi A. Thay v\u00ec t\u00ecm IP tr\u1ef1c ti\u1ebfp, resolver ph\u1ea3i t\u00ecm t\u00ean ch\u00ednh t\u1eafc tr\u01b0\u1edbc, r\u1ed3i m\u1edbi t\u00ecm IP c\u1ee7a t\u00ean \u0111\u00f3.<\/p>\n<p>M\u1ed7i b\u01b0\u1edbc tra c\u1ee9u DNS t\u1ed1n m\u1ed9t kho\u1ea3ng th\u1eddi gian (d\u00f9 r\u1ea5t nh\u1ecf, t\u00ednh b\u1eb1ng mili gi\u00e2y). Do \u0111\u00f3, vi\u1ec7c s\u1eed d\u1ee5ng CNAME c\u00f3 th\u1ec3 l\u00e0m t\u0103ng nh\u1eb9 \u0111\u1ed9 tr\u1ec5 (<a href=\"https:\/\/interdata.vn\/blog\/latency-la-gi\/\">latency<\/a>) khi ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp t\u00ean mi\u1ec1n l\u1ea7n \u0111\u1ea7u ti\u00ean (khi cache ch\u01b0a c\u00f3).<\/p>\n<p>M\u1ee9c \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng th\u01b0\u1eddng kh\u00f4ng l\u1edbn v\u00e0 kh\u00f3 nh\u1eadn bi\u1ebft \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i, nh\u01b0ng c\u1ea7n \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc trong c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u \u0111\u1ed9 tr\u1ec5 c\u1ef1c th\u1ea5p. Tr\u00e1nh t\u1ea1o chu\u1ed7i CNAME l\u1ed3ng nhau (CNAME tr\u1ecf \u0111\u1ebfn CNAME kh\u00e1c) v\u00ec \u0111i\u1ec1u n\u00e0y l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 s\u1ed1 b\u01b0\u1edbc tra c\u1ee9u.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Thiet-lap-gia-tri-TTL-Time-To-Live-phu-hop\"><\/span>Thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb TTL (Time To Live) ph\u00f9 h\u1ee3p<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>TTL (Time To Live) quy\u1ebft \u0111\u1ecbnh th\u1eddi gian c\u00e1c m\u00e1y ch\u1ee7 DNS kh\u00e1c l\u01b0u tr\u1eef th\u00f4ng tin b\u1ea3n ghi CNAME c\u1ee7a b\u1ea1n trong b\u1ed9 nh\u1edb \u0111\u1ec7m (cache).<\/p>\n<ul>\n<li><strong>TTL th\u1ea5p (v\u00ed d\u1ee5: 60 &#8211; 300 gi\u00e2y):<\/strong> Thay \u0111\u1ed5i DNS (n\u1ebfu b\u1ea1n c\u1eadp nh\u1eadt CNAME) s\u1ebd \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt nhanh ch\u00f3ng tr\u00ean to\u00e0n c\u1ea7u. Tuy nhi\u00ean, \u0111i\u1ec1u n\u00e0y l\u00e0m t\u0103ng s\u1ed1 l\u01b0\u1ee3ng truy v\u1ea5n \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS c\u1ee7a b\u1ea1n v\u00ec cache h\u1ebft h\u1ea1n nhanh h\u01a1n.<\/li>\n<li><strong>TTL cao (v\u00ed d\u1ee5: 3600 &#8211; 86400 gi\u00e2y):<\/strong> Gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7 DNS v\u00ec c\u00e1c resolver l\u01b0u cache l\u00e2u h\u01a1n. Nh\u01b0ng n\u1ebfu b\u1ea1n c\u1ea7n thay \u0111\u1ed5i CNAME, s\u1ebd m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n \u0111\u1ec3 thay \u0111\u1ed5i \u0111\u00f3 c\u00f3 hi\u1ec7u l\u1ef1c kh\u1eafp n\u01a1i.<\/li>\n<\/ul>\n<p>L\u1eddi khuy\u00ean chung:<\/p>\n<ul>\n<li>Khi b\u1ea1n \u0111ang c\u1ea5u h\u00ecnh ho\u1eb7c th\u1eed nghi\u1ec7m, h\u00e3y \u0111\u1eb7t TTL th\u1ea5p (v\u00ed d\u1ee5: 300).<\/li>\n<li>Khi c\u1ea5u h\u00ecnh \u0111\u00e3 \u1ed5n \u0111\u1ecbnh v\u00e0 \u00edt thay \u0111\u1ed5i, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1eb7t TTL cao h\u01a1n (v\u00ed d\u1ee5: 3600 ho\u1eb7c 14400) \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t.<\/li>\n<\/ul>\n<p>Ch\u1ecdn TTL ph\u00f9 h\u1ee3p gi\u00fap c\u00e2n b\u1eb1ng gi\u1eefa t\u1ed1c \u0111\u1ed9 c\u1eadp nh\u1eadt v\u00e0 hi\u1ec7u qu\u1ea3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a DNS.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau-hoi-thuong-gap-ve-ban-ghi-CNAME-FAQ\"><\/span>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 b\u1ea3n ghi CNAME (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn m\u00e0 ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng g\u1eb7p khi l\u00e0m vi\u1ec7c v\u1edbi b\u1ea3n ghi CNAME:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Co-the-tao-nhieu-ban-ghi-CNAME-cho-cung-mot-ten-alias-khong\"><\/span>C\u00f3 th\u1ec3 t\u1ea1o nhi\u1ec1u b\u1ea3n ghi CNAME cho c\u00f9ng m\u1ed9t t\u00ean (alias) kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kh\u00f4ng. M\u1ed9t t\u00ean mi\u1ec1n ho\u1eb7c t\u00ean mi\u1ec1n ph\u1ee5 c\u1ee5 th\u1ec3 ch\u1ec9 c\u00f3 th\u1ec3 c\u00f3 <strong>m\u1ed9t<\/strong> b\u1ea3n ghi CNAME duy nh\u1ea5t. N\u1ebfu b\u1ea1n t\u1ea1o CNAME cho <code>blog.tenmien.com<\/code>, b\u1ea1n kh\u00f4ng th\u1ec3 t\u1ea1o th\u00eam m\u1ed9t CNAME kh\u00e1c ho\u1eb7c b\u1ea5t k\u1ef3 lo\u1ea1i b\u1ea3n ghi n\u00e0o kh\u00e1c (nh\u01b0 A, MX, TXT) cho ch\u00ednh t\u00ean <code>blog.tenmien.com<\/code> \u0111\u00f3.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Co-the-tao-ban-ghi-CNAME-tro-den-mot-dia-chi-IP-khong\"><\/span>C\u00f3 th\u1ec3 t\u1ea1o b\u1ea3n ghi CNAME tr\u1ecf \u0111\u1ebfn m\u1ed9t \u0111\u1ecba ch\u1ec9 IP kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kh\u00f4ng. B\u1ea3n ghi CNAME <strong>ph\u1ea3i<\/strong> tr\u1ecf \u0111\u1ebfn m\u1ed9t <strong>t\u00ean mi\u1ec1n<\/strong> kh\u00e1c (Canonical Name). N\u1ebfu b\u1ea1n mu\u1ed1n tr\u1ecf m\u1ed9t t\u00ean mi\u1ec1n \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 IP, b\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng B\u1ea3n ghi A (cho IPv4) ho\u1eb7c B\u1ea3n ghi AAAA (cho <a href=\"https:\/\/interdata.vn\/blog\/ipv6-la-gi\/\">IPv6<\/a>).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ban-ghi-CNAME-co-anh-huong-den-SEO-khong\"><\/span>B\u1ea3n ghi CNAME c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn SEO kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng CNAME \u0111\u00fang c\u00e1ch th\u01b0\u1eddng <strong>kh\u00f4ng g\u00e2y \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c<\/strong> \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn SEO (Search Engine Optimization). C\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm nh\u01b0 Google hi\u1ec3u v\u00e0 c\u00f3 th\u1ec3 x\u1eed l\u00fd c\u00e1c b\u1ea3n ghi CNAME.<\/p>\n<p>Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd:<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 tr\u1ec5 nh\u1ecf:<\/strong> Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp, CNAME c\u00f3 th\u1ec3 t\u0103ng nh\u1eb9 th\u1eddi gian tra c\u1ee9u DNS. T\u1ed1c \u0111\u1ed9 trang l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 x\u1ebfp h\u1ea1ng, nh\u01b0ng \u1ea3nh h\u01b0\u1edfng t\u1eeb CNAME th\u01b0\u1eddng r\u1ea5t nh\u1ecf.<\/li>\n<li><strong>Tr\u00e1nh chu\u1ed7i CNAME d\u00e0i:<\/strong> Nhi\u1ec1u CNAME l\u1ed3ng nhau c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5 v\u00e0 g\u00e2y kh\u00f3 kh\u0103n cho vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u c\u1ee7a bot t\u00ecm ki\u1ebfm.<\/li>\n<li><strong>\u01afu ti\u00ean <a href=\"https:\/\/interdata.vn\/blog\/redirect-301-la-gi\/\">301 Redirect<\/a> cho h\u1ee3p nh\u1ea5t domain:<\/strong> N\u1ebfu m\u1ee5c \u0111\u00edch ch\u00ednh l\u00e0 h\u1ee3p nh\u1ea5t <code>tenmien.com<\/code> v\u00e0 <code>www.tenmien.com<\/code>, s\u1eed d\u1ee5ng chuy\u1ec3n h\u01b0\u1edbng 301 \u1edf c\u1ea5p web server th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n v\u1ec1 m\u1eb7t SEO so v\u1edbi ch\u1ec9 d\u00f9ng CNAME.<\/li>\n<\/ul>\n<p>Nh\u00ecn chung, h\u00e3y s\u1eed d\u1ee5ng CNAME khi n\u00f3 ph\u00f9 h\u1ee3p v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt (tr\u1ecf \u0111\u1ebfn d\u1ecbch v\u1ee5 ngo\u00e0i, t\u1ea1o alias), v\u00e0 \u0111\u1eebng qu\u00e1 lo l\u1eafng v\u1ec1 \u1ea3nh h\u01b0\u1edfng SEO n\u1ebfu c\u1ea5u h\u00ecnh \u0111\u00fang.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Mat-bao-lau-de-thay-doi-ban-ghi-CNAME-co-hieu-luc\"><\/span>M\u1ea5t bao l\u00e2u \u0111\u1ec3 thay \u0111\u1ed5i b\u1ea3n ghi CNAME c\u00f3 hi\u1ec7u l\u1ef1c?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Th\u1eddi gian \u0111\u1ec3 thay \u0111\u1ed5i CNAME \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt tr\u00ean to\u00e0n c\u1ea7u ph\u1ee5 thu\u1ed9c ch\u1ee7 y\u1ebfu v\u00e0o <strong>gi\u00e1 tr\u1ecb TTL<\/strong> b\u1ea1n \u0111\u00e3 \u0111\u1eb7t cho b\u1ea3n ghi \u0111\u00f3 tr\u01b0\u1edbc khi thay \u0111\u1ed5i, v\u00e0 t\u1ed1c \u0111\u1ed9 l\u00e0m m\u1edbi cache c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7 DNS tr\u00ean internet.<\/p>\n<p>N\u1ebfu TTL l\u00e0 3600 gi\u00e2y (1 gi\u1edd), th\u00ec c\u00f3 th\u1ec3 m\u1ea5t \u0111\u1ebfn 1 gi\u1edd \u0111\u1ec3 c\u00e1c m\u00e1y ch\u1ee7 DNS h\u1ebft h\u1ea1n cache c\u0169 v\u00e0 l\u1ea5y th\u00f4ng tin m\u1edbi. \u0110\u00f4i khi c\u00f3 th\u1ec3 nhanh h\u01a1n ho\u1eb7c ch\u1eadm h\u01a1n m\u1ed9t ch\u00fat. N\u1ebfu b\u1ea1n \u0111\u1eb7t TTL th\u1ea5p h\u01a1n (v\u00ed d\u1ee5 300 gi\u00e2y), thay \u0111\u1ed5i s\u1ebd nhanh h\u01a1n.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Co-the-tao-CNAME-tro-den-mot-CNAME-khac-khong\"><\/span>C\u00f3 th\u1ec3 t\u1ea1o CNAME tr\u1ecf \u0111\u1ebfn m\u1ed9t CNAME kh\u00e1c kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f3, v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t chu\u1ed7i CNAME (v\u00ed d\u1ee5: <code>alias1.tenmien.com<\/code> CNAME \u0111\u1ebfn <code>alias2.tenmien.com<\/code>, r\u1ed3i <code>alias2.tenmien.com<\/code> CNAME \u0111\u1ebfn <code>dichvungoai.com<\/code>).<\/p>\n<p>Tuy nhi\u00ean, \u0111i\u1ec1u n\u00e0y <strong>kh\u00f4ng \u0111\u01b0\u1ee3c khuy\u1ebfn kh\u00edch<\/strong> v\u00ec m\u1ed7i CNAME trong chu\u1ed7i s\u1ebd th\u00eam m\u1ed9t b\u01b0\u1edbc tra c\u1ee9u DNS, l\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5 \u0111\u00e1ng k\u1ec3 v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i n\u1ebfu chu\u1ed7i qu\u00e1 d\u00e0i ho\u1eb7c b\u1ecb l\u1eb7p v\u00f2ng. N\u00ean tr\u1ecf CNAME tr\u1ef1c ti\u1ebfp \u0111\u1ebfn t\u00ean mi\u1ec1n ch\u00ednh t\u1eafc cu\u1ed1i c\u00f9ng n\u1ebfu c\u00f3 th\u1ec3.<\/p>\n<p>Hi v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 cung c\u1ea5p cho b\u1ea1n c\u00e1i nh\u00ecn chi ti\u1ebft v\u00e0 \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 b\u1ea3n ghi CNAME, gi\u00fap b\u1ea1n t\u1ef1 tin h\u01a1n khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c c\u1ea5u h\u00ecnh DNS cho t\u00ean mi\u1ec1n c\u1ee7a m\u00ecnh. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c lo\u1ea1i b\u1ea3n ghi DNS nh\u01b0 CNAME l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng \u0111\u1ec3 v\u1eadn h\u00e0nh website v\u00e0 c\u00e1c d\u1ecbch v\u1ee5 tr\u1ef1c tuy\u1ebfn hi\u1ec7u qu\u1ea3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea1n \u0111ang qu\u1ea3n l\u00fd website ho\u1eb7c t\u00ean mi\u1ec1n v\u00e0 b\u1eaft g\u1eb7p thu\u1eadt ng\u1eef &#8220;B\u1ea3n ghi CNAME&#8221;? \u0110\u1eebng lo l\u1eafng n\u1ebfu b\u1ea1n ch\u01b0a r\u00f5 CNAME l\u00e0 g\u00ec. B\u1ea3n ghi n\u00e0y \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS), gi\u00fap li\u00ean k\u1ebft c\u00e1c d\u1ecbch v\u1ee5 v\u00e0 qu\u1ea3n l\u00fd t\u00ean mi\u1ec1n hi\u1ec7u qu\u1ea3 h\u01a1n. B\u00e0i<\/p>\n","protected":false},"author":2,"featured_media":27865,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[149],"tags":[],"class_list":["post-27860","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-control-panel"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27860","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=27860"}],"version-history":[{"count":1,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27860\/revisions"}],"predecessor-version":[{"id":27866,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27860\/revisions\/27866"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/27865"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=27860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=27860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=27860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}