{"id":10940,"date":"2021-06-26T14:41:19","date_gmt":"2021-06-26T07:41:19","guid":{"rendered":"https:\/\/blog.tinohost.com\/?p=9119"},"modified":"2026-10-28T11:39:56","modified_gmt":"2026-10-28T04:39:56","slug":"cname-la-gi","status":"publish","type":"post","link":"https:\/\/tino.vn\/blog\/cname-la-gi\/","title":{"rendered":"CNAME l\u00e0 g\u00ec? B\u1ea3n ghi CNAME d\u00f9ng khi n\u00e0o v\u00e0 kh\u00e1c b\u1ea3n ghi A th\u1ebf n\u00e0o"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>CNAME (Canonical Name record) l\u00e0 b\u1ea3n ghi DNS \u0111\u1eb7t m\u1ed9t t\u00ean mi\u1ec1n l\u00e0m b\u00ed danh c\u1ee7a m\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c: khi c\u00f3 ng\u01b0\u1eddi h\u1ecfi t\u00ean b\u00ed danh, DNS tr\u1ea3 v\u1ec1 t\u00ean \u0111\u00edch v\u00e0 ti\u1ebfp t\u1ee5c tra t\u00ean \u0111\u00f3 \u0111\u1ec3 l\u1ea5y \u0111\u1ecba ch\u1ec9 IP.<\/strong> V\u00ed d\u1ee5 t\u00ean www c\u00f3 CNAME tr\u1ecf v\u1ec1 t\u00ean g\u1ed1c th\u00ec hai t\u00ean lu\u00f4n c\u00f3 c\u00f9ng IP.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CNAME l\u00e0 m\u1ed9t trong c\u00e1c lo\u1ea1i b\u1ea3n ghi c\u1ee7a <a href=\"https:\/\/tino.vn\/blog\/dns-la-gi\/\">DNS<\/a>, khai b\u00e1o trong tr\u00ecnh qu\u1ea3n l\u00fd DNS c\u1ee7a <a href=\"https:\/\/tino.vn\/blog\/ten-mien-la-gi\/\">t\u00ean mi\u1ec1n<\/a>. Ph\u1ea7n d\u01b0\u1edbi gi\u1ea3i th\u00edch CNAME ho\u1ea1t \u0111\u1ed9ng th\u1ebf n\u00e0o, khi n\u00e0o n\u00ean d\u00f9ng thay b\u1ea3n ghi A, c\u00e1c quy t\u1eafc d\u1ec5 sai v\u00e0 c\u00e1ch t\u1ea1o, ki\u1ec3m tra b\u1ea3n ghi CNAME.<\/p>\n\n\n\n<h2 id=\"CNAME_l\u00e0_g\u00ec?\">CNAME l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CNAME l\u00e0 b\u1ea3n ghi \u00e1nh x\u1ea1 m\u1ed9t t\u00ean (alias, b\u00ed danh) sang m\u1ed9t t\u00ean kh\u00e1c (canonical name, t\u00ean chu\u1ea9n), \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc1034\" target=\"_blank\" rel=\"noopener nofollow\">RFC 1034<\/a>. B\u1ea3n ghi CNAME kh\u00f4ng ch\u1ee9a IP; gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 lu\u00f4n l\u00e0 m\u1ed9t t\u00ean mi\u1ec1n. IP \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb b\u1ea3n ghi A ho\u1eb7c AAAA c\u1ee7a t\u00ean \u0111\u00edch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong tr\u00ecnh qu\u1ea3n l\u00fd DNS, m\u1ed9t b\u1ea3n ghi CNAME th\u01b0\u1eddng c\u00f3 b\u1ed1n \u00f4:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>T\u00ean (Name \/ Host)<\/th><th>Lo\u1ea1i<\/th><th>Gi\u00e1 tr\u1ecb (Target)<\/th><th>TTL<\/th><\/tr><\/thead><tbody><tr><td>blog<\/td><td>CNAME<\/td><td>tenban.vn<\/td><td>3600<\/td><\/tr><tr><td>help<\/td><td>CNAME<\/td><td>tenban.helpdesk.example<\/td><td>T\u1ef1 \u0111\u1ed9ng<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">\u00d4 T\u00ean ghi ph\u1ea7n b\u00ed danh (tr\u00ecnh qu\u1ea3n l\u00fd t\u1ef1 n\u1ed1i \u0111u\u00f4i tenban.vn); \u00f4 Gi\u00e1 tr\u1ecb ghi t\u00ean \u0111\u00edch, kh\u00f4ng ghi http:\/\/ hay \u0111\u01b0\u1eddng d\u1eabn.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">TTL (Time to live) l\u00e0 s\u1ed1 gi\u00e2y resolver \u0111\u01b0\u1ee3c ph\u00e9p nh\u1edb b\u1ea3n ghi. TTL l\u1edbn th\u00ec \u0111\u1ee1 t\u1ed1n truy v\u1ea5n nh\u01b0ng s\u1eeda b\u1ea3n ghi l\u00e2u c\u00f3 hi\u1ec7u l\u1ef1c; TTL nh\u1ecf th\u00ec ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n\n\n\n<h2 id=\"B\u1ea3n_ghi_CNAME_ho\u1ea1t_\u0111\u1ed9ng_nh\u01b0_th\u1ebf_n\u00e0o?\">B\u1ea3n ghi CNAME ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Khi resolver h\u1ecfi m\u1ed9t t\u00ean c\u00f3 b\u1ea3n ghi CNAME, nameserver tr\u1ea3 v\u1ec1 t\u00ean \u0111\u00edch; resolver tra ti\u1ebfp t\u00ean \u0111\u00edch \u0111\u1ebfn l\u00fac g\u1eb7p b\u1ea3n ghi A ho\u1eb7c AAAA r\u1ed3i tr\u1ea3 IP cho thi\u1ebft b\u1ecb. Ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ea5y b\u01b0\u1edbc trung gian n\u00e0y, thanh \u0111\u1ecba ch\u1ec9 v\u1eabn gi\u1eef t\u00ean h\u1ecd \u0111\u00e3 nh\u1eadp.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1400\" height=\"750\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-chuoi-phan-giai.webp\" alt=\"S\u01a1 \u0111\u1ed3 hai v\u00ed d\u1ee5 CNAME d\u1eabn t\u1edbi IP: www.tenban.vn c\u00f3 CNAME t\u1edbi tenban.vn. r\u1ed3i b\u1ea3n ghi A 203.0.113.10; shop.tenban.vn c\u00f3 CNAME t\u1edbi tenban.example.net. c\u1ee7a d\u1ecbch v\u1ee5 ngo\u00e0i r\u1ed3i b\u1ea3n ghi A 198.51.100.7; \u0111\u1ed5i IP ch\u1ec9 s\u1eeda b\u1ea3n ghi A, CNAME gi\u1eef nguy\u00ean\" class=\"wp-image-132602\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-chuoi-phan-giai.webp 1400w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-chuoi-phan-giai-300x161.webp 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-chuoi-phan-giai-1024x549.webp 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-chuoi-phan-giai-768x411.webp 768w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n c\u00f3 th\u1ec3 xem m\u1ed9t CNAME th\u1eadt: tra www.tino.vn b\u1eb1ng <a href=\"https:\/\/toolbox.googleapps.com\/apps\/dig\/\" target=\"_blank\" rel=\"noopener nofollow\">Google Admin Toolbox Dig<\/a> cho k\u1ebft qu\u1ea3 CNAME tr\u1ecf v\u1ec1 tino.vn., TTL 1 gi\u1edd.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1200\" height=\"457\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-tra-cname-www-tino-vn.webp\" alt=\"\u1ea2nh ch\u1ee5p Google Admin Toolbox Dig ng\u00e0y 27\/10\/2026 tra b\u1ea3n ghi CNAME c\u1ee7a www.tino.vn: TTL 1 gi\u1edd, TARGET tino.vn.; khoanh \u0111\u1ecf gi\u00e1 tr\u1ecb tino.vn.\" class=\"wp-image-132603\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-tra-cname-www-tino-vn.webp 1200w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-tra-cname-www-tino-vn-300x114.webp 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-tra-cname-www-tino-vn-1024x390.webp 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/cname-la-gi-tra-cname-www-tino-vn-768x292.webp 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><figcaption class=\"wp-element-caption\">\u1ea2nh ch\u1ee5p c\u00f4ng c\u1ee5 Google Admin Toolbox Dig (toolbox.googleapps.com) ng\u00e0y 27\/10\/2026.<\/figcaption><\/figure>\n\n\n\n<h2 id=\"Khi_n\u00e0o_n\u00ean_d\u00f9ng_b\u1ea3n_ghi_CNAME?\">Khi n\u00e0o n\u00ean d\u00f9ng b\u1ea3n ghi CNAME?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00ean d\u00f9ng CNAME khi m\u1ed9t t\u00ean ph\u1ea3i lu\u00f4n \u0111i theo m\u1ed9t t\u00ean kh\u00e1c, \u0111\u1eb7c bi\u1ec7t khi IP c\u1ee7a t\u00ean \u0111\u00edch do ng\u01b0\u1eddi kh\u00e1c qu\u1ea3n l\u00fd v\u00e0 c\u00f3 th\u1ec3 \u0111\u1ed5i. B\u1ea1n ch\u1ec9 khai m\u1ed9t l\u1ea7n; b\u00ean kia \u0111\u1ed5i m\u00e1y ch\u1ee7 th\u00ec b\u1ea3n ghi c\u1ee7a b\u1ea1n v\u1eabn \u0111\u00fang.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>www v\u00e0 t\u00ean g\u1ed1c l\u00e0 c\u00f9ng m\u1ed9t website:<\/strong> www CNAME tenban.vn, ch\u1ec9 c\u1ea7n s\u1eeda b\u1ea3n ghi A c\u1ee7a t\u00ean g\u1ed1c khi \u0111\u1ed5i hosting.<\/li>\n\n\n<li><strong>Subdomain \u0111\u1eb7t \u1edf d\u1ecbch v\u1ee5 c\u1ee7a b\u00ean th\u1ee9 ba:<\/strong> landing page, c\u1eeda h\u00e0ng, help desk th\u01b0\u1eddng y\u00eau c\u1ea7u CNAME t\u1edbi t\u00ean c\u1ee7a h\u1ecd, v\u00ed d\u1ee5 khi g\u1eafn t\u00ean mi\u1ec1n ri\u00eang cho <a href=\"https:\/\/tino.vn\/blog\/ladipage-la-gi\/\">LadiPage<\/a>.<\/li>\n\n\n<li><strong>CDN:<\/strong> tr\u1ecf static.tenban.vn v\u1ec1 t\u00ean do <a href=\"https:\/\/tino.vn\/blog\/cdn-la-gi\/\">CDN<\/a> c\u1ea5p \u0111\u1ec3 ph\u00e2n ph\u1ed1i \u1ea3nh, t\u1ec7p t\u0129nh.<\/li>\n\n\n<li><strong>X\u00e1c minh d\u1ecbch v\u1ee5:<\/strong> Google Search Console cho ph\u00e9p x\u00e1c minh t\u00ean mi\u1ec1n b\u1eb1ng b\u1ea3n ghi TXT ho\u1eb7c CNAME (<a href=\"https:\/\/support.google.com\/webmasters\/answer\/9008080?hl=vi\" target=\"_blank\" rel=\"noopener nofollow\">h\u01b0\u1edbng d\u1eabn c\u1ee7a Google<\/a>); c\u00e1ch l\u00e0m b\u1eb1ng TXT c\u00f3 \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/xac-minh-quyen-so-huu-ten-mien-bang-dns\/\">x\u00e1c minh quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n b\u1eb1ng DNS<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu subdomain ch\u1ea1y tr\u00ean ch\u00ednh hosting c\u1ee7a b\u1ea1n th\u00ec th\u01b0\u1eddng d\u00f9ng b\u1ea3n ghi A ho\u1eb7c \u0111\u1ec3 cPanel t\u1ef1 t\u1ea1o, xem <a href=\"https:\/\/tino.vn\/blog\/subdomain-la-gi\/\">subdomain l\u00e0 g\u00ec<\/a>, <a href=\"https:\/\/tino.vn\/blog\/cach-tao-subdomain\/\">c\u00e1ch t\u1ea1o subdomain tr\u00ean cPanel<\/a> v\u00e0 <a href=\"https:\/\/tino.vn\/blog\/cai-dat-wordpress-tren-subdomain\/\">c\u00e0i WordPress tr\u00ean subdomain<\/a>.<\/p>\n\n\n\n<h2 id=\"CNAME_kh\u00e1c_b\u1ea3n_ghi_A_th\u1ebf_n\u00e0o?\">CNAME kh\u00e1c b\u1ea3n ghi A th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea3n ghi A tr\u1ecf th\u1eb3ng m\u1ed9t t\u00ean t\u1edbi \u0111\u1ecba ch\u1ec9 IPv4, c\u00f2n CNAME tr\u1ecf m\u1ed9t t\u00ean t\u1edbi m\u1ed9t t\u00ean kh\u00e1c. A d\u00f9ng khi b\u1ea1n bi\u1ebft v\u00e0 t\u1ef1 qu\u1ea3n IP c\u1ee7a m\u00e1y ch\u1ee7; CNAME d\u00f9ng khi mu\u1ed1n \u0111i theo t\u00ean c\u1ee7a m\u1ed9t d\u1ecbch v\u1ee5. T\u00ean g\u1ed1c (apex) ch\u1ec9 d\u00f9ng \u0111\u01b0\u1ee3c A, AAAA ho\u1eb7c CNAME flattening.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><\/th><th>B\u1ea3n ghi A<\/th><th>B\u1ea3n ghi CNAME<\/th><th>CNAME flattening \/ ALIAS<\/th><\/tr><\/thead><tbody><tr><td>Gi\u00e1 tr\u1ecb<\/td><td>\u0110\u1ecba ch\u1ec9 IPv4<\/td><td>M\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c<\/td><td>M\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c<\/td><\/tr><tr><td>\u0110\u1eb7t \u1edf t\u00ean g\u1ed1c tenban.vn<\/td><td>\u0110\u01b0\u1ee3c<\/td><td>Kh\u00f4ng<\/td><td>\u0110\u01b0\u1ee3c (nh\u00e0 cung c\u1ea5p DNS t\u1ef1 \u0111\u1ed5i th\u00e0nh A khi tr\u1ea3 l\u1eddi)<\/td><\/tr><tr><td>\u0110i chung b\u1ea3n ghi kh\u00e1c c\u00f9ng t\u00ean<\/td><td>\u0110\u01b0\u1ee3c (MX, TXT\u2026)<\/td><td>Kh\u00f4ng<\/td><td>\u0110\u01b0\u1ee3c<\/td><\/tr><tr><td>Khi IP \u0111\u00edch \u0111\u1ed5i<\/td><td>Ph\u1ea3i s\u1eeda tay<\/td><td>T\u1ef1 theo t\u00ean \u0111\u00edch<\/td><td>T\u1ef1 theo t\u00ean \u0111\u00edch<\/td><\/tr><tr><td>S\u1ed1 l\u1ea7n tra<\/td><td>1<\/td><td>Th\u00eam \u00edt nh\u1ea5t 1 l\u1ea7n tra t\u00ean \u0111\u00edch<\/td><td>Nh\u00e0 cung c\u1ea5p tra h\u1ed9<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">CNAME flattening l\u00e0 t\u00ednh n\u0103ng c\u1ee7a m\u1ed9t s\u1ed1 nh\u00e0 cung c\u1ea5p DNS, v\u00ed d\u1ee5 <a href=\"https:\/\/developers.cloudflare.com\/dns\/cname-flattening\/\" target=\"_blank\" rel=\"noopener nofollow\">Cloudflare<\/a>; kh\u00f4ng ph\u1ea3i lo\u1ea1i b\u1ea3n ghi chu\u1ea9n.<\/figcaption><\/figure>\n\n\n\n<h2 id=\"Nh\u1eefng_quy_t\u1eafc_d\u1ec5_sai_khi_d\u00f9ng_CNAME\">Nh\u1eefng quy t\u1eafc d\u1ec5 sai khi d\u00f9ng CNAME<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea3n ghi CNAME c\u00f3 r\u00e0ng bu\u1ed9c ch\u1eb7t h\u01a1n c\u00e1c b\u1ea3n ghi kh\u00e1c: m\u1ed9t t\u00ean \u0111\u00e3 c\u00f3 CNAME th\u00ec kh\u00f4ng \u0111\u01b0\u1ee3c c\u00f3 th\u00eam b\u1ea5t k\u1ef3 b\u1ea3n ghi n\u00e0o kh\u00e1c. T\u1eeb r\u00e0ng bu\u1ed9c n\u00e0y sinh ra c\u00e1c l\u1ed7i hay g\u1eb7p nh\u01b0 \u0111\u1eb7t CNAME \u1edf t\u00ean g\u1ed1c, tr\u1ecf MX v\u00e0o t\u00ean c\u00f3 CNAME hay ghi URL v\u00e0o \u00f4 gi\u00e1 tr\u1ecb.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Kh\u00f4ng \u0111\u1eb7t CNAME \u1edf t\u00ean g\u1ed1c (@):<\/strong> t\u00ean g\u1ed1c lu\u00f4n c\u00f3 SOA v\u00e0 NS, m\u00e0 <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc1912\" target=\"_blank\" rel=\"noopener nofollow\">RFC 1912<\/a> ghi CNAME &#8220;kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed3n t\u1ea1i c\u00f9ng d\u1eef li\u1ec7u kh\u00e1c&#8221;.<\/li>\n\n\n<li><strong>Kh\u00f4ng t\u1ea1o CNAME tr\u00f9ng t\u00ean v\u1edbi b\u1ea3n ghi kh\u00e1c:<\/strong> \u0111\u00e3 c\u00f3 www ki\u1ec3u CNAME th\u00ec kh\u00f4ng th\u00eam www ki\u1ec3u A, TXT hay MX.<\/li>\n\n\n<li><strong>MX v\u00e0 NS kh\u00f4ng tr\u1ecf v\u00e0o t\u00ean c\u00f3 CNAME:<\/strong> <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc2181\" target=\"_blank\" rel=\"noopener nofollow\">RFC 2181<\/a> \u00a710.3 y\u00eau c\u1ea7u MX, NS tr\u1ecf t\u1edbi t\u00ean c\u00f3 b\u1ea3n ghi A\/AAAA. M\u00e1y ch\u1ee7 nh\u1eadn mail khai b\u1eb1ng t\u00ean th\u1eadt nh\u01b0 mx.tenban.vn.<\/li>\n\n\n<li><strong>Gi\u00e1 tr\u1ecb l\u00e0 t\u00ean mi\u1ec1n, kh\u00f4ng ph\u1ea3i URL hay IP:<\/strong> ghi tenban.example.net, kh\u00f4ng ghi https:\/\/tenban.example.net\/trang hay 203.0.113.10.<\/li>\n\n\n<li><strong>Tr\u00e1nh chu\u1ed7i CNAME d\u00e0i:<\/strong> CNAME tr\u1ecf sang m\u1ed9t CNAME kh\u00e1c v\u1eabn ch\u1ea1y, nh\u01b0ng m\u1ed7i t\u1ea7ng th\u00eam m\u1ed9t l\u1ea7n tra v\u00e0 th\u00eam m\u1ed9t \u0111i\u1ec3m c\u00f3 th\u1ec3 l\u1ed7i.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"C\u00e1ch_t\u1ea1o_b\u1ea3n_ghi_CNAME\">C\u00e1ch t\u1ea1o b\u1ea3n ghi CNAME<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ea1o b\u1ea3n ghi CNAME \u1edf tr\u00ecnh qu\u1ea3n l\u00fd DNS c\u1ee7a n\u01a1i \u0111ang gi\u1eef nameserver cho t\u00ean mi\u1ec1n: trang qu\u1ea3n l\u00fd t\u00ean mi\u1ec1n c\u1ee7a nh\u00e0 \u0111\u0103ng k\u00fd, Zone Editor c\u1ee7a cPanel ho\u1eb7c m\u1ee5c DNS c\u1ee7a Cloudflare. T\u1ea1o \u1edf n\u01a1i kh\u00e1c s\u1ebd kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng, n\u00ean h\u00e3y ki\u1ec3m tra nameserver tr\u01b0\u1edbc.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ki\u1ec3m tra nameserver \u0111ang d\u00f9ng<\/strong> \u0111\u1ec3 bi\u1ebft v\u00e0o \u0111\u00e2u s\u1eeda, xem <a href=\"https:\/\/tino.vn\/blog\/name-servers-la-gi\/\">name server l\u00e0 g\u00ec<\/a>.<\/li>\n\n\n<li><strong>M\u1edf tr\u00ecnh qu\u1ea3n l\u00fd DNS<\/strong>, ch\u1ecdn th\u00eam b\u1ea3n ghi (Add record), lo\u1ea1i <strong>CNAME<\/strong>.<\/li>\n\n\n<li><strong>\u00d4 T\u00ean:<\/strong> nh\u1eadp ph\u1ea7n b\u00ed danh, v\u00ed d\u1ee5 <code>www<\/code> ho\u1eb7c <code>shop<\/code>.<\/li>\n\n\n<li><strong>\u00d4 Gi\u00e1 tr\u1ecb:<\/strong> nh\u1eadp t\u00ean \u0111\u00edch do nh\u00e0 cung c\u1ea5p \u0111\u01b0a, v\u00ed d\u1ee5 <code>tenban.example.net<\/code>.<\/li>\n\n\n<li><strong>TTL:<\/strong> \u0111\u1ec3 m\u1eb7c \u0111\u1ecbnh, ho\u1eb7c 300 gi\u00e2y n\u1ebfu s\u1eafp \u0111\u1ed5i qua l\u1ea1i nhi\u1ec1u l\u1ea7n.<\/li>\n\n\n<li><strong>L\u01b0u<\/strong>, ch\u1edd h\u1ebft TTL c\u0169 (n\u1ebfu tr\u01b0\u1edbc \u0111\u00f3 t\u00ean n\u00e0y \u0111\u00e3 c\u00f3 b\u1ea3n ghi kh\u00e1c) r\u1ed3i ki\u1ec3m tra.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean Cloudflare, b\u1ea3n ghi CNAME b\u1eadt \u0111\u01b0\u1ee3c ch\u1ebf \u0111\u1ed9 Proxied (\u0111\u00e1m m\u00e2y cam) ho\u1eb7c DNS only (\u0111\u00e1m m\u00e2y x\u00e1m); d\u1ecbch v\u1ee5 b\u00ean ngo\u00e0i y\u00eau c\u1ea7u x\u00e1c minh t\u00ean mi\u1ec1n th\u01b0\u1eddng c\u1ea7n \u0111\u1ec3 DNS only. Xem th\u00eam <a href=\"https:\/\/tino.vn\/blog\/cloudflare-la-gi\/\">Cloudflare l\u00e0 g\u00ec<\/a>.<\/p>\n\n\n\n<h2 id=\"C\u00e1ch_ki\u1ec3m_tra_b\u1ea3n_ghi_CNAME\">C\u00e1ch ki\u1ec3m tra b\u1ea3n ghi CNAME<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra CNAME b\u1eb1ng l\u1ec7nh nslookup tr\u00ean Windows, dig tr\u00ean Linux, macOS, ho\u1eb7c Google Admin Toolbox Dig nh\u01b0 \u1ea3nh \u1edf tr\u00ean. K\u1ebft qu\u1ea3 \u0111\u00fang ph\u1ea3i hi\u1ec7n t\u00ean \u0111\u00edch b\u1ea1n \u0111\u00e3 khai; n\u1ebfu th\u1ea5y \u0111\u1ecba ch\u1ec9 IP thay v\u00ec t\u00ean, t\u00ean \u0111\u00f3 \u0111ang c\u00f3 b\u1ea3n ghi A ch\u1ee9 kh\u00f4ng ph\u1ea3i CNAME.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nslookup -type=cname www.tenban.vn 8.8.8.8\ndig CNAME www.tenban.vn +short<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu k\u1ebft qu\u1ea3 c\u00f2n gi\u00e1 tr\u1ecb c\u0169, c\u00f3 th\u1ec3 resolver \u0111ang gi\u1eef cache; th\u1eed v\u1edbi resolver kh\u00e1c (1.1.1.1, 8.8.8.8) ho\u1eb7c ch\u1edd h\u1ebft TTL.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u1ea7n t\u00ean mi\u1ec1n cho website? <a href=\"https:\/\/tino.vn\/ten-mien\">\u0110\u0103ng k\u00fd t\u00ean mi\u1ec1n t\u1ea1i Tino<\/a>: ki\u1ec3m tra t\u00ean mi\u1ec1n c\u00f2n tr\u1ed1ng, \u0111\u0103ng k\u00fd .vn v\u00e0 qu\u1ed1c t\u1ebf, qu\u1ea3n l\u00fd DNS trong m\u1ed9t t\u00e0i kho\u1ea3n. Xem gi\u00e1 tr\u00ean trang s\u1ea3n ph\u1ea9m.<\/p>\n\n\n\n<h2 id=\"C\u00e2u_h\u1ecfi_th\u01b0\u1eddng_g\u1eb7p\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"CNAME_c\u00f3_ph\u1ea3i_l\u00e0_chuy\u1ec3n_h\u01b0\u1edbng_(redirect)_kh\u00f4ng?\">CNAME c\u00f3 ph\u1ea3i l\u00e0 chuy\u1ec3n h\u01b0\u1edbng (redirect) kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng. CNAME ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng DNS, cho bi\u1ebft t\u00ean n\u00e0y d\u00f9ng chung IP v\u1edbi t\u00ean kia; tr\u00ecnh duy\u1ec7t v\u1eabn gi\u1eef nguy\u00ean \u0111\u1ecba ch\u1ec9 ng\u01b0\u1eddi d\u00f9ng g\u00f5. Mu\u1ed1n chuy\u1ec3n www.tenban.vn sang tenban.vn tr\u00ean thanh \u0111\u1ecba ch\u1ec9 th\u00ec c\u1ea7n chuy\u1ec3n h\u01b0\u1edbng HTTP 301 \u1edf m\u00e1y ch\u1ee7 web, xem <a href=\"https:\/\/tino.vn\/blog\/redirect-la-gi\/\">redirect l\u00e0 g\u00ec<\/a>.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"TTL_c\u1ee7a_b\u1ea3n_ghi_CNAME_n\u00ean_\u0111\u1eb7t_bao_nhi\u00eau?\">TTL c\u1ee7a b\u1ea3n ghi CNAME n\u00ean \u0111\u1eb7t bao nhi\u00eau?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng c\u00f3 con s\u1ed1 b\u1eaft bu\u1ed9c. B\u1ea3n ghi \u1ed5n \u0111\u1ecbnh th\u01b0\u1eddng \u0111\u1ec3 m\u1eb7c \u0111\u1ecbnh c\u1ee7a nh\u00e0 cung c\u1ea5p (th\u01b0\u1eddng 1 gi\u1edd ho\u1eb7c &#8220;T\u1ef1 \u0111\u1ed9ng&#8221;). Tr\u01b0\u1edbc khi \u0111\u1ed5i \u0111\u00edch, h\u1ea1 TTL xu\u1ed1ng 300 gi\u00e2y kho\u1ea3ng m\u1ed9t ng\u00e0y \u0111\u1ec3 thay \u0111\u1ed5i c\u00f3 hi\u1ec7u l\u1ef1c nhanh, \u0111\u1ed5i xong t\u0103ng l\u1ea1i.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"M\u1ed9t_t\u00ean_c\u00f3_th\u1ec3_c\u00f3_hai_b\u1ea3n_ghi_CNAME_kh\u00f4ng?\">M\u1ed9t t\u00ean c\u00f3 th\u1ec3 c\u00f3 hai b\u1ea3n ghi CNAME kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng. M\u1ed7i t\u00ean ch\u1ec9 c\u00f3 t\u1ed1i \u0111a m\u1ed9t b\u1ea3n ghi CNAME. Mu\u1ed1n ph\u00e2n t\u1ea3i sang nhi\u1ec1u m\u00e1y ch\u1ee7 th\u00ec d\u00f9ng nhi\u1ec1u b\u1ea3n ghi A, AAAA, ho\u1eb7c t\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a nh\u00e0 cung c\u1ea5p DNS.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"CNAME c\u00f3 ph\u1ea3i l\u00e0 chuy\u1ec3n h\u01b0\u1edbng (redirect) kh\u00f4ng?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>Kh\u00f4ng. CNAME ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng DNS, cho bi\u1ebft t\u00ean n\u00e0y d\u00f9ng chung IP v\u1edbi t\u00ean kia; tr\u00ecnh duy\u1ec7t v\u1eabn gi\u1eef nguy\u00ean \u0111\u1ecba ch\u1ec9 ng\u01b0\u1eddi d\u00f9ng g\u00f5. Mu\u1ed1n chuy\u1ec3n www.tenban.vn sang tenban.vn tr\u00ean thanh \u0111\u1ecba ch\u1ec9 th\u00ec c\u1ea7n chuy\u1ec3n h\u01b0\u1edbng HTTP 301 \u1edf m\u00e1y ch\u1ee7 web, xem <a>redirect l\u00e0 g\u00ec<\/a>.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"TTL c\u1ee7a b\u1ea3n ghi CNAME n\u00ean \u0111\u1eb7t bao nhi\u00eau?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>Kh\u00f4ng c\u00f3 con s\u1ed1 b\u1eaft bu\u1ed9c. B\u1ea3n ghi \u1ed5n \u0111\u1ecbnh th\u01b0\u1eddng \u0111\u1ec3 m\u1eb7c \u0111\u1ecbnh c\u1ee7a nh\u00e0 cung c\u1ea5p (th\u01b0\u1eddng 1 gi\u1edd ho\u1eb7c \\\"T\u1ef1 \u0111\u1ed9ng\\\"). Tr\u01b0\u1edbc khi \u0111\u1ed5i \u0111\u00edch, h\u1ea1 TTL xu\u1ed1ng 300 gi\u00e2y kho\u1ea3ng m\u1ed9t ng\u00e0y \u0111\u1ec3 thay \u0111\u1ed5i c\u00f3 hi\u1ec7u l\u1ef1c nhanh, \u0111\u1ed5i xong t\u0103ng l\u1ea1i.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"M\u1ed9t t\u00ean c\u00f3 th\u1ec3 c\u00f3 hai b\u1ea3n ghi CNAME kh\u00f4ng?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>Kh\u00f4ng. M\u1ed7i t\u00ean ch\u1ec9 c\u00f3 t\u1ed1i \u0111a m\u1ed9t b\u1ea3n ghi CNAME. Mu\u1ed1n ph\u00e2n t\u1ea3i sang nhi\u1ec1u m\u00e1y ch\u1ee7 th\u00ec d\u00f9ng nhi\u1ec1u b\u1ea3n ghi A, AAAA, ho\u1eb7c t\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a nh\u00e0 cung c\u1ea5p DNS.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t\t\t]\n\t}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>CNAME (Canonical Name record) l\u00e0 b\u1ea3n ghi DNS \u0111\u1eb7t m\u1ed9t t\u00ean mi\u1ec1n l\u00e0m b\u00ed danh c\u1ee7a m\u1ed9t t\u00ean mi\u1ec1n kh\u00e1c: khi c\u00f3 ng\u01b0\u1eddi h\u1ecfi t\u00ean b\u00ed danh, DNS tr\u1ea3 v\u1ec1 t\u00ean \u0111\u00edch v\u00e0 ti\u1ebfp t\u1ee5c tra t\u00ean \u0111\u00f3 \u0111\u1ec3 l\u1ea5y \u0111\u1ecba ch\u1ec9 IP. V\u00ed d\u1ee5 t\u00ean www c\u00f3 CNAME tr\u1ecf v\u1ec1 t\u00ean g\u1ed1c th\u00ec hai [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":132543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5404],"tags":[6242],"class_list":["post-10940","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-webmasters","tag-kien-thuc-website"],"_links":{"self":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/10940","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/comments?post=10940"}],"version-history":[{"count":1,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/10940\/revisions"}],"predecessor-version":[{"id":132721,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/10940\/revisions\/132721"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media\/132543"}],"wp:attachment":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media?parent=10940"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/categories?post=10940"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/tags?post=10940"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}