{"id":10940,"date":"2021-06-26T14:41:19","date_gmt":"2021-06-26T07:41:19","guid":{"rendered":"https:\/\/blog.tinohost.com\/?p=9119"},"modified":"2021-11-22T12:40:16","modified_gmt":"2021-11-22T05:40:16","slug":"cname-la-gi","status":"publish","type":"post","link":"https:\/\/tino.vn\/blog\/cname-la-gi\/","title":{"rendered":"Cname l\u00e0 g\u00ec? C\u00e1ch s\u1eed d\u1ee5ng cname record"},"content":{"rendered":"\n

Cname l\u00e0 ph\u01b0\u01a1ng ti\u1ec7n k\u1ebft n\u1ed1i c\u00e1c y\u1ebfu t\u1ed1 c\u01a1 b\u1ea3n c\u1ee7a m\u1ed9t website nh\u01b0 t\u00ean mi\u1ec1n<\/a>, hosting<\/a> v\u00e0 source<\/a>. TTL, DNS v\u00e0 Cname d\u1ea7n tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn v\u1edbi ng\u01b0\u1eddi d\u00f9ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 nh\u1eefng ng\u01b0\u1eddi ho\u1ea1t \u0111\u1ed9ng trong l\u0129nh v\u1ef1c c\u00f4ng ngh\u1ec7 th\u00f4ng tin. H\u00f4m nay, TinoHost s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 kh\u00e1i ni\u1ec7m c\u1ee7a c\u00e1c thu\u1eadt ng\u1eef n\u00e0y c\u0169ng nh\u01b0 c\u00e1c c\u00e1ch s\u1eed d\u1ee5ng b\u1ea3n ghi hi\u1ec7u qu\u1ea3 nh\u1ea5t.<\/strong> <\/p>\n\n\n\n

<\/a>TTL l\u00e0 g\u00ec?<\/strong><\/h2>\n\n\n\n

\n TTL \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft b\u1edfi c\u1ee5m t\u1eeb ti\u1ebfng Anh Time to live <\/strong>(t\u1ea1m d\u1ecbch l\u00e0: th\u1eddi gian t\u1ed3n t\u1ea1i<\/em>). \u0110\u00e2y l\u00e0 thu\u1eadt ng\u1eef quen thu\u1ed9c trong l\u0129nh v\u1ef1c c\u00f4ng ngh\u1ec7 th\u00f4ng tin. Ngo\u00e0i ra, \u0111\u1ecbnh ngh\u0129a TTL c\u00f2n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong DNS caching v\u00e0 CDN caching.\n<\/p>\n\n\n\n

\n \u0110\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng c\u1ee7a TTL l\u00e0 th\u1eddi gian, \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng gi\u00e2y. N\u1ebfu TTL c\u00e0ng l\u1edbn th\u00ec th\u1eddi gian ghi nh\u1edb th\u00f4ng tin c\u1ee7a m\u00e1y ch\u1ee7 DNS c\u00e0ng l\u00e2u v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Gi\u1ed1ng nh\u01b0 khi thay \u0111\u1ed5i t\u00ean mi\u1ec1n tr\u00ean DNS, qu\u00e1 tr\u00ecnh c\u1eadp nh\u1eadt th\u00f4ng tin tr\u00ean m\u00e1y ch\u1ee7 DNS trung gian s\u1ebd di\u1ec5n ra ch\u1eadm d\u1ea7n.\n<\/p>\n\n\n\n

TTL, DNS v\u00e0 Cname l\u00e0 nh\u1eefng kh\u00e1i ni\u1ec7m song tr\u00f9ng th\u01b0\u1eddng \u0111i \u0111\u00f4i v\u1edbi nhau. V\u00ec v\u1eady, tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 b\u1ea3n ghi n\u00e0y, ng\u01b0\u1eddi d\u00f9ng n\u00ean n\u1eafm qua kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n c\u1ee7a TTL v\u00e0 DNS. <\/p>\n\n\n\n

\"cname-la-gi\"<\/figure><\/div>\n\n\n\n

<\/a>DNS l\u00e0 g\u00ec?<\/strong><\/h2>\n\n\n\n

DNS<\/a> vi\u1ebft t\u1eaft b\u1edfi c\u1ee5m t\u1eeb Domain Name System<\/strong> (t\u1ea1m d\u1ecbch l\u00e0: h\u1ec7 th\u1ed1ng ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n<\/em>). H\u1ec7 th\u1ed1ng n\u00e0y \u0111\u01b0\u1ee3c s\u00e1ng l\u1eadp v\u00e0o n\u0103m 1984 c\u00f3 ch\u1ee9c n\u0103ng phi\u00ean d\u1ecbch t\u00ean mi\u1ec1n v\u00e0 truy\u1ec1n t\u1ea3i th\u00f4ng tin. DNS c\u00f3 7 lo\u1ea1i b\u1ea3n ghi c\u01a1 b\u1ea3n l\u1ea7n l\u01b0\u1ee3t l\u00e0: Cname, A record, MX record<\/a>, AAAA record, TXT record, SRV record, NS record. <\/p>\n\n\n\n

Kh\u00e1i ni\u1ec7m Cname<\/strong><\/h2>\n\n\n\n

Cname \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft b\u1edfi c\u1ee5m t\u1eeb Canonical name record<\/strong> (t\u1ea1m d\u1ecbch l\u00e0: b\u1ea3n ghi b\u00ed danh<\/em>). Cname l\u00e0 m\u1ed9t trong c\u00e1c lo\u1ea1i b\u1ea3n ghi c\u1ee7a h\u1ec7 th\u1ed1ng ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n (DNS). B\u1ea3n ghi n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3u nh\u01b0 \u201ct\u00ean b\u00ed m\u1eadt\u201d c\u1ee7a m\u1ed9t t\u00ean mi\u1ec1n n\u00e0o \u0111\u00f3 v\u00e0 c\u00f3 m\u1ed9t \u0111\u1ecba ch\u1ec9 IP cho ph\u00e9p g\u1eafn nhi\u1ec1u Domain tr\u00ean c\u00f9ng m\u00e1y ch\u1ee7. <\/p>\n\n\n\n

<\/a>\u0110\u1ecbnh d\u1ea1ng b\u1ea3n ghi Cname<\/strong><\/h3>\n\n\n\n

\n C\u1ea5u tr\u00fac b\u1ea3n ghi Cname \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1edfi RFC 1035 tu\u00e2n theo ti\u00eau chu\u1ea9n \u0111\u1ecbnh d\u1ea1ng c\u1ea5p cao. Trong \u0111\u00f3, RData lu\u00f4n \u0111\u1ea3m b\u1ea3o m\u1ed9t y\u1ebfu t\u1ed1 duy nh\u1ea5t:\n<\/p>\n\n\n\n

Y\u1ebfu t\u1ed1<\/strong>: T\u00ean mi\u1ec1n\n<\/p>\n\n\n\n

M\u00f4 t\u1ea3<\/strong>: T\u00ean mi\u1ec1n ch\u00ednh ho\u1eb7c ch\u1ec9 \u0111\u1ecbnh cho b\u1ea3n ghi.\n<\/p>\n\n\n\n

\n B\u1ea3n ghi A \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y:\n<\/p>\n\n\n\n

\n CNAME <domain-name>\n<\/p>\n\n\n\n

\n (<domain-name> : t\u00ean mi\u1ec1n \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n ho\u1eb7c t\u00ean mi\u1ec1n ch\u00ednh, v\u00ed d\u1ee5 nh\u01b0: vietnix.vn)\n<\/p>\n\n\n\n

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