{"id":16865,"date":"2020-03-21T06:30:26","date_gmt":"2020-03-20T23:30:26","guid":{"rendered":"https:\/\/kiencang.net\/?p=15357"},"modified":"2022-08-20T00:29:08","modified_gmt":"2022-08-19T17:29:08","slug":"cdn-toi-uu-anh","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cdn-toi-uu-anh\/","title":{"rendered":"S\u1eed d\u1ee5ng CDN \u0111\u1ec3 t\u1ed1i \u01b0u \u1ea3nh"},"content":{"rendered":"\n<p>D\u00f9ng CDN \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a \u1ea3nh kh\u00f4ng ph\u1ea3i bi\u1ec7n ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u1ea5t hi\u1ec7n nay, nh\u01b0ng m\u1ed9t s\u1ed1 website s\u1ebd th\u00edch n\u00f3, v\u00ed d\u1ee5 nh\u01b0 c\u00e1c trang c\u00f3 y\u00eau c\u1ea7u cao v\u1ec1 t\u00f9y bi\u1ebfn \u1ea3nh.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/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\" role=\"button\"><label for=\"item-6577d72e0edd2\" ><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><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d72e0edd2\"  type=\"checkbox\" id=\"item-6577d72e0edd2\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/cdn-toi-uu-anh\/#1_Tai_sao_ban_nen_su_dung_CDN_cho_anh\" title=\"1. T\u1ea1i sao b\u1ea1n n\u00ean s\u1eed d\u1ee5ng CDN cho \u1ea3nh?\">1. T\u1ea1i sao b\u1ea1n n\u00ean s\u1eed d\u1ee5ng CDN cho \u1ea3nh?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/cdn-toi-uu-anh\/#2_CDN_anh_la_gi\" title=\"2. CDN \u1ea3nh l\u00e0 g\u00ec?\">2. CDN \u1ea3nh 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-3\" href=\"https:\/\/kiencang.net\/cdn-toi-uu-anh\/#3_Cach_CDN_anh_su_dung_URL_de_bieu_thi_cac_tuy_chon_toi_uu_hoa\" title=\"3. C\u00e1ch CDN \u1ea3nh s\u1eed d\u1ee5ng URL \u0111\u1ec3 bi\u1ec3u th\u1ecb c\u00e1c t\u00f9y ch\u1ecdn t\u1ed1i \u01b0u h\u00f3a\">3. C\u00e1ch CDN \u1ea3nh s\u1eed d\u1ee5ng URL \u0111\u1ec3 bi\u1ec3u th\u1ecb c\u00e1c t\u00f9y ch\u1ecdn t\u1ed1i \u01b0u h\u00f3a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/cdn-toi-uu-anh\/#4_Mot_so_kieu_CDN_anh\" title=\"4. M\u1ed9t s\u1ed1 ki\u1ec3u CDN \u1ea3nh\">4. M\u1ed9t s\u1ed1 ki\u1ec3u CDN \u1ea3nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/cdn-toi-uu-anh\/#5_Lua_chon_dich_vu_CDN_anh\" title=\"5. L\u1ef1a ch\u1ecdn d\u1ecbch v\u1ee5 CDN \u1ea3nh\">5. L\u1ef1a ch\u1ecdn d\u1ecbch v\u1ee5 CDN \u1ea3nh<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"1-t\u1ea1i-sao-b\u1ea1n-nen-s\u1eed-d\u1ee5ng-cdn-cho-\u1ea3nh\"><span class=\"ez-toc-section\" id=\"1_Tai_sao_ban_nen_su_dung_CDN_cho_anh\"><\/span>1. T\u1ea1i sao b\u1ea1n n\u00ean s\u1eed d\u1ee5ng CDN cho \u1ea3nh?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ea1ng ph\u00e2n t\u00e1n n\u1ed9i dung \u1ea3nh l\u00e0 gi\u1ea3i ph\u00e1p tuy\u1ec7t v\u1eddi \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a ph\u00e2n ph\u1ed1i \u1ea3nh. Chuy\u1ec3n sang s\u1eed d\u1ee5ng CDN \u1ea3nh c\u00f3 th\u1ec3 \u0111em \u0111\u1ebfn kh\u1ea3 n\u0103ng <a href=\"https:\/\/www.youtube.com\/watch?v=YJGCZCaIZkQ&amp;t=1010s\" target=\"_blank\" rel=\"noreferrer noopener\">ti\u1ebft ki\u1ec7m t\u1eeb 40-80%<\/a> v\u1ec1 kh\u00eda c\u1ea1nh k\u00edch c\u1ee1 file \u1ea3nh. <\/p>\n\n\n\n<p>Tr\u00ean l\u00fd thuy\u1ebft, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c ch\u1ec9 c\u1ea7n nh\u1edd v\u00e0o vi\u1ec7c x\u00e2y d\u1ef1ng m\u00e3 kh\u00e9o l\u00e9o, nh\u01b0ng n\u00f3 l\u1ea1i hi\u1ebfm khi x\u1ea3y ra trong th\u1ef1c t\u1ebf!<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-cdn-\u1ea3nh-la-gi\"><span class=\"ez-toc-section\" id=\"2_CDN_anh_la_gi\"><\/span>2. CDN \u1ea3nh l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>CDN \u1ea3nh chuy\u00ean cho vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i, t\u1ed1i \u01b0u h\u00f3a v\u00e0 ph\u00e2n ph\u1ed1i \u1ea3nh. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 ngh\u0129 v\u1ec1 n\u00f3 nh\u01b0 d\u1ea1ng APIs cho vi\u1ec7c truy c\u1eadp v\u00e0 thao t\u00e1c v\u1edbi h\u00ecnh \u1ea3nh tr\u00ean trang c\u1ee7a b\u1ea1n. <\/p>\n\n\n\n<p>V\u1edbi c\u00e1c \u1ea3nh \u0111\u01b0\u1ee3c t\u1ea3i t\u1eeb CDN, th\u00ec URL \u1ea3nh kh\u00f4ng ch\u1ec9 cho bi\u1ebft c\u1ee5 th\u1ec3 h\u00ecnh \u1ea3nh n\u00e0o \u0111\u01b0\u1ee3c t\u1ea3i, m\u00e0 c\u00f2n c\u00f3 c\u00e1c th\u00f4ng s\u1ed1 (parameter) nh\u01b0 <a href=\"https:\/\/kiencang.net\/kich-thuoc-anh-toi-uu\/\" target=\"_blank\" rel=\"noreferrer noopener\">k\u00edch c\u1ee1<\/a> (v\u00ed d\u1ee5 600px), \u0111\u1ecbnh d\u1ea1ng (v\u00ed d\u1ee5 JPG) v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng (v\u00ed d\u1ee5 90%). <\/p>\n\n\n\n<p>\u0110i\u1ec1u \u0111\u00f3 gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng t\u1ea1o \u0111\u01b0\u1ee3c c\u00e1c bi\u1ebfn th\u1ec3 \u1ea3nh cho c\u00e1c m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng kh\u00e1c nhau.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/image-cdn-requests-1024x523.jpg\" alt=\"CDN cho \u1ea3nh\" class=\"wp-image-15361\"\/><figcaption>V\u00ed d\u1ee5 v\u1ec1 c\u00e1c bi\u1ebfn \u0111\u1ed5i m\u00e0 CDN \u1ea3nh c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n d\u1ef1a v\u00e0o c\u00e1c tham s\u1ed1 trong URL \u1ea3nh. <code>size=small<\/code> c\u00f3 ngh\u0129a l\u00e0 k\u00edch c\u1ee1 nh\u1ecf. <code>crop=circle<\/code> c\u00f3 ngh\u0129a l\u00e0 l\u00e0m tr\u00f2n h\u00ecnh. <code>format=webp<\/code> c\u00f3 ngh\u0129a l\u00e0 s\u1eed d\u1ee5ng <a href=\"https:\/\/kiencang.net\/dinh-dang-anh-webp\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0111\u1ecbnh d\u1ea1ng webp cho \u1ea3nh<\/a> (thay v\u00ec jpg ho\u1eb7c png)<\/figcaption><\/figure>\n\n\n\n<p>CDN \u1ea3nh kh\u00e1c v\u1edbi c\u00e1c m\u00e3 t\u1ed1i \u01b0u h\u00f3a h\u00ecnh \u1ea3nh ki\u1ec3u build-time \u1edf ch\u1ed7 ng\u01b0\u1eddi ta t\u1ea1o ra c\u00e1c phi\u00ean b\u1ea3n m\u1edbi c\u1ee7a h\u00ecnh \u1ea3nh m\u00e0 h\u1ecd c\u1ea7n. H\u1ec7 qu\u1ea3 l\u00e0 CDN n\u00f3i chung c\u00f3 kh\u1ea3 n\u0103ng ph\u00f9 h\u1ee3p h\u01a1n trong vi\u1ec7c t\u1ea1o ra \u1ea3nh cho c\u00e1c nhu c\u1ea7u t\u00f9y bi\u1ebfn cao c\u1ee7a t\u1eebng kh\u00e1ch h\u00e0ng c\u00e1 nh\u00e2n so v\u1edbi vi\u1ec7c x\u00e2y d\u1ef1ng m\u00e3.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-cach-cdn-\u1ea3nh-s\u1eed-d\u1ee5ng-url-d\u1ec3-bi\u1ec3u-th\u1ecb-cac-tuy-ch\u1ecdn-t\u1ed1i-\u01b0u-hoa\"><span class=\"ez-toc-section\" id=\"3_Cach_CDN_anh_su_dung_URL_de_bieu_thi_cac_tuy_chon_toi_uu_hoa\"><\/span>3. C\u00e1ch CDN \u1ea3nh s\u1eed d\u1ee5ng URL \u0111\u1ec3 bi\u1ec3u th\u1ecb c\u00e1c t\u00f9y ch\u1ecdn t\u1ed1i \u01b0u h\u00f3a<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>URL \u1ea3nh s\u1eed d\u1ee5ng b\u1edfi m\u1ea1ng CDN \u1ea3nh s\u1ebd truy\u1ec1n \u0111\u1ea1t th\u00f4ng tin quan tr\u1ecdng v\u1ec1 \u1ea3nh c\u0169ng nh\u01b0 c\u00e1c bi\u1ebfn \u0111\u1ed5i v\u00e0 t\u1ed1i \u01b0u h\u00f3a m\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho n\u00f3. <\/p>\n\n\n\n<p>\u0110\u1ecbnh d\u1ea1ng c\u1ee7a URL c\u00f2n t\u00f9y thu\u1ed9c v\u00e0o d\u1ecbch v\u1ee5 CDN \u1ea3nh c\u1ee5 th\u1ec3, nh\u01b0ng \u1edf c\u1ea5p \u0111\u1ed9 cao, t\u1ea5t c\u1ea3 ch\u00fang \u0111\u1ec1u c\u00f3 c\u00e1c t\u00ednh n\u0103ng t\u01b0\u01a1ng t\u1ef1. <\/p>\n\n\n\n<p>Gi\u1edd ch\u00fang ta c\u00f9ng t\u00ecm hi\u1ec3u c\u00e1c t\u00ednh n\u0103ng ph\u1ed5 bi\u1ebfn nh\u1ea5t. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/image-cdn-url-1024x163.jpg\" alt=\"URL c\u1ee7a CDN \u1ea3nh\" class=\"wp-image-15364\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"a-origin-g\u1ed1c\">A. Origin \/ G\u1ed1c<\/h3>\n\n\n\n<p>\u1ea2nh CDN c\u00f3 th\u1ec3 c\u00f3 d\u1ea1ng th\u1ee9c tr\u00ean t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n (t\u00f9y ch\u1ec9nh d\u1ea1ng subdomain v\u00ed d\u1ee5 nh\u01b0 <code>cdn.kiencang.net<\/code>) ho\u1eb7c t\u00ean mi\u1ec1n c\u1ee7a d\u1ecbch v\u1ee5 CDN \u1ea3nh. <\/p>\n\n\n\n<p>C\u00e1c d\u1ecbch v\u1ee5 CDN \u1ea3nh c\u1ee7a b\u00ean th\u1ee9 ba th\u01b0\u1eddng cung c\u1ea5p t\u00f9y ch\u1ecdn cho vi\u1ec7c s\u1eed d\u1ee5ng t\u00ean mi\u1ec1n t\u00f9y ch\u1ec9nh (custom domain) c\u00f3 k\u00e8m theo t\u00ednh ph\u00ed (ho\u1eb7c mi\u1ec5n ph\u00ed). <\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng t\u00ean mi\u1ec1n c\u1ee7a ri\u00eang b\u1ea1n gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng thay \u0111\u1ed5i d\u1ecbch v\u1ee5 nh\u00e0 cung c\u1ea5p CDN \u1ea3nh sau n\u00e0y v\u00ec b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i thay \u0111\u1ed5i URL n\u1eefa (t\u1ee9c l\u00e0 v\u1eabn s\u1eed d\u1ee5ng ti\u1ebfp \u0111\u01b0\u1ee3c <code>cdn.ten-mien-cua-ban.com<\/code>).<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 \u1edf tr\u00ean s\u1eed d\u1ee5ng t\u00ean mi\u1ec1n c\u1ee7a d\u1ecbch v\u1ee5 CDN \u1ea3nh (<code>example-cdn.com<\/code>) v\u1edbi t\u00ean mi\u1ec1n ph\u1ee5 \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a, ch\u1ee9 kh\u00f4ng ph\u1ea3i s\u1eed d\u1ee5ng t\u00ean mi\u1ec1n t\u00f9y ch\u1ec9nh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"b-image-\u1ea3nh\">B. Image \/ \u1ea2nh<\/h3>\n\n\n\n<p>CDN \u1ea3nh th\u01b0\u1eddng c\u00f3 th\u1ec3 c\u1ea5u h\u00ecnh t\u1ef1 \u0111\u1ed9ng \u0111\u1ec3 l\u1ea5y \u1ea3nh t\u1eeb c\u00e1c v\u1ecb tr\u00ed hi\u1ec7n c\u00f3 c\u1ee7a ch\u00fang khi c\u1ea7n thi\u1ebft. Kh\u1ea3 n\u0103ng n\u00e0y th\u01b0\u1eddng \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch bao g\u1ed3m URL ho\u00e0n ch\u1ec9nh c\u1ee7a <em>\u1ea3nh \u0111\u00e3 t\u1ed3n t\u1ea1i<\/em> v\u00e0o b\u00ean trong URL c\u1ee7a \u1ea3nh \u0111\u01b0\u1ee3c t\u1ea1o b\u1edfi d\u1ecbch v\u1ee5 CDN \u1ea3nh. <\/p>\n\n\n\n<p>L\u1ea5y v\u00ed d\u1ee5, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y m\u1ed9t URL tr\u00f4ng gi\u1ed1ng nh\u01b0 th\u1ebf n\u00e0y: <em>https:\/\/my-site.example-cdn.com\/https:\/\/flowers.com\/daisy.jpg\/quality=auto<\/em>. URL n\u00e0y s\u1ebd l\u1ea5y v\u00e0 t\u1ed1i \u01b0u h\u00f3a \u1ea3nh \u1edf \u0111\u1ecba ch\u1ec9: <em>https:\/\/flowers.com\/daisy.jpg <\/em><\/p>\n\n\n\n<p>M\u1ed9t v\u00ed d\u1ee5 g\u1ea7n g\u0169i h\u01a1n v\u1edbi ai \u0111ang d\u00f9ng WordPress v\u00e0 s\u1eed d\u1ee5ng <a href=\"https:\/\/kiencang.net\/plugin-flying-images\/\" target=\"_blank\" rel=\"noreferrer noopener\">plugin Flying Images<\/a>: URL CDN \u1ea3nh mi\u1ec5n ph\u00ed c\u1ee7a n\u00f3 c\u00f3 d\u1ea1ng nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>https:&#47;&#47;cdn.statically.io\/img\/speed.family\/wp-content\/uploads\/2019\/12\/plugin-lazy-load-anh-moi.jpg<\/code><\/pre>\n\n\n\n<p>M\u1ed9t c\u00e1ch kh\u00e1c hi\u1ec7n \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 r\u1ed9ng r\u00e3i \u0111\u1ec3 t\u1ea3i \u1ea3nh l\u00ean CDN \u1ea3nh l\u00e0 g\u1eedi ch\u00fang qua y\u00eau c\u1ea7u HTTP POST \u0111\u1ebfn API c\u1ee7a CDN \u1ea3nh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"c-security-key-khoa-b\u1ea3o-m\u1eadt\">C. Security key \/ Kh\u00f3a b\u1ea3o m\u1eadt<\/h3>\n\n\n\n<p>Kh\u00f3a b\u1ea3o m\u1eadt (security key) ng\u0103n kh\u00f4ng cho ng\u01b0\u1eddi kh\u00e1c t\u1ea1o c\u00e1c phi\u00ean b\u1ea3n m\u1edbi c\u1ee7a h\u00ecnh \u1ea3nh. <\/p>\n\n\n\n<p>N\u1ebfu t\u00ednh n\u0103ng n\u00e0y \u0111\u01b0\u1ee3c b\u1eadt, t\u1eebng phi\u00ean b\u1ea3n m\u1edbi c\u1ee7a \u1ea3nh y\u00eau c\u1ea7u m\u1ed9t kh\u00f3a b\u1ea3o m\u1eadt duy nh\u1ea5t (unique). N\u1ebfu ai \u0111\u00f3 c\u1ed1 g\u1eafng thay \u0111\u1ed5i c\u00e1c th\u00f4ng s\u1ed1 c\u1ee7a URL \u1ea3nh nh\u01b0ng l\u1ea1i kh\u00f4ng cung c\u1ea5p kh\u00f3a b\u1ea3o m\u1eadt h\u1ee3p l\u1ec7, h\u1ecd kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o ra m\u1ed9t phi\u00ean b\u1ea3n m\u1edbi.<\/p>\n\n\n\n<p>D\u1ecbch v\u1ee5 CDN \u1ea3nh c\u1ee7a b\u1ea1n s\u1ebd \u0111\u1ec3 \u00fd c\u00e1c chi ti\u1ebft c\u1ee7a vi\u1ec7c t\u1ea1o v\u00e0 theo d\u00f5i kh\u00f3a b\u1ea3o m\u1eadt cho b\u1ea1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"d-transformations-cac-bi\u1ebfn-d\u1ed5i\">D. Transformations \/ C\u00e1c bi\u1ebfn \u0111\u1ed5i<\/h3>\n\n\n\n<p>C\u00e1c d\u1ecbch v\u1ee5 CDN \u1ea3nh cung c\u1ea5p h\u00e0ng ch\u1ee5c ph\u01b0\u01a1ng th\u1ee9c, v\u00e0 trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p l\u00e0 h\u00e0ng tr\u0103m c\u00e1c c\u00e1ch bi\u1ebfn \u0111\u1ed5i h\u00ecnh \u1ea3nh kh\u00e1c nhau. <\/p>\n\n\n\n<p>C\u00e1c bi\u1ebfn \u0111\u1ed5i n\u00e0y \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh th\u00f4ng qua chu\u1ed7i URL, v\u00e0 kh\u00f4ng c\u00f3 h\u1ea1n ch\u1ebf trong vi\u1ec7c s\u1eed d\u1ee5ng nhi\u1ec1u chuy\u1ec3n \u0111\u1ed5i v\u00e0o c\u00f9ng m\u1ed9t th\u1eddi \u0111i\u1ec3m. <\/p>\n\n\n\n<p>D\u01b0\u1edbi g\u00f3c nh\u00ecn v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1c \u0111\u1ed9 website, c\u00e1c chuy\u1ec3n \u0111\u1ed5i \u1ea3nh quan tr\u1ecdng nh\u1ea5t bao g\u1ed3m <em>k\u00edch c\u1ee1<\/em>,<em> m\u1eadt \u0111\u1ed9 \u0111i\u1ec3m \u1ea3nh<\/em>,<em> \u0111\u1ecbnh d\u1ea1ng <\/em>v\u00e0<em> n\u00e9n<\/em>. <\/p>\n\n\n\n<p>C\u00e1c chuy\u1ec3n \u0111\u1ed5i tr\u00ean l\u00e0 l\u00fd do gi\u1ea3i th\u00edch v\u00ec sao vi\u1ec7c b\u1ea1n chuy\u1ec3n sang d\u00f9ng CDN \u1ea3nh th\u01b0\u1eddng gi\u00fap website c\u1ee7a b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c <em>k\u00edch c\u1ee1 \u1ea3nh gi\u1ea3m \u0111\u00e1ng k\u1ec3<\/em>.<\/p>\n\n\n\n<p>C\u00f3 m\u1ed9t xu h\u01b0\u1edbng kh\u00e1ch quan, ph\u1ed5 bi\u1ebfn trong v\u1ea5n \u0111\u1ec1 l\u1ef1a ch\u1ecdn b\u1ed9 c\u00e0i \u0111\u1eb7t t\u1ed1t nh\u1ea5t cho hi\u1ec7u su\u1ea5t chuy\u1ec3n \u0111\u1ed5i, v\u00ec th\u1ebf m\u1ed9t s\u1ed1 CDN \u1ea3nh h\u1ed7 tr\u1ee3 ch\u1ebf \u0111\u1ed9 &#8220;auto \/ t\u1ef1 \u0111\u1ed9ng&#8221; cho c\u00e1c chuy\u1ec3n \u0111\u1ed5i n\u00e0y. <\/p>\n\n\n\n<p>L\u1ea5y v\u00ed d\u1ee5, thay v\u00ec ph\u1ea3i ch\u1ec9 \u0111\u1ecbnh \u1ea3nh \u0111\u01b0\u1ee3c chuy\u1ec3n sang <a href=\"https:\/\/kiencang.net\/dinh-dang-anh-webp\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0111\u1ecbnh d\u1ea1ng WebP<\/a>, b\u1ea1n c\u00f3 th\u1ec3 cho ph\u00e9p CDN l\u1ef1a ch\u1ecdn t\u1ef1 \u0111\u1ed9ng v\u00e0 ph\u1ee5c v\u1ee5 \u0111\u1ecbnh d\u1ea1ng t\u1ed1i \u01b0u. C\u00e1c t\u00edn hi\u1ec7u m\u00e0 CDN \u1ea3nh c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1ch t\u1ed1t nh\u1ea5t cho m\u1ee5c ti\u00eau chuy\u1ec3n \u0111\u1ed5i \u1ea3nh bao g\u1ed3m:<\/p>\n\n\n\n<ul><li><a href=\"https:\/\/developers.google.com\/web\/updates\/2015\/09\/automating-resource-selection-with-client-hints\" target=\"_blank\" rel=\"noreferrer noopener\">Client hints<\/a> (C\u00e1c g\u1ee3i \u00fd t\u1eeb ng\u01b0\u1eddi d\u00f9ng, v\u00ed d\u1ee5 \u0111\u1ed9 r\u1ed9ng khung nh\u00ecn tr\u00ecnh duy\u1ec7t, DPR, \u0111\u1ed9 r\u1ed9ng \u1ea3nh);<\/li><li>header <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Headers\/Save-Data\" target=\"_blank\" rel=\"noreferrer noopener\">Save-Data<\/a>;<\/li><li>request header <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Headers\/User-Agent\" target=\"_blank\" rel=\"noreferrer noopener\">User-Agent<\/a>;<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Network_Information_API\" target=\"_blank\" rel=\"noreferrer noopener\">Network Information API<\/a>;<\/li><\/ul>\n\n\n\n<p>L\u1ea5y v\u00ed d\u1ee5, CDN \u1ea3nh c\u00f3 th\u1ec3 ph\u1ee5c v\u1ee5 JPEG XR cho tr\u00ecnh duy\u1ec7t Edge, WebP cho tr\u00ecnh duy\u1ec7t Chrome, v\u00e0 JPEG cho tr\u00ecnh duy\u1ec7t c\u0169. <\/p>\n\n\n\n<p>C\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh l\u00e0 ph\u1ed5 bi\u1ebfn b\u1edfi v\u00ec ch\u00fang cho ph\u00e9p b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c l\u1ee3i th\u1ebf chuy\u00ean m\u00f4n quan tr\u1ecdng c\u1ee7a d\u1ecbch v\u1ee5 CDN \u1ea3nh trong vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a h\u00ecnh \u1ea3nh m\u00e0 <em>kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i m\u00e3<\/em> \u0111\u1ec3 \u00e1p d\u1ee5ng c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi m\u1ed9t khi ch\u00fang \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi d\u1ecbch v\u1ee5 CDN \u1ea3nh \u0111ang d\u00f9ng.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-m\u1ed9t-s\u1ed1-ki\u1ec3u-cdn-\u1ea3nh\"><span class=\"ez-toc-section\" id=\"4_Mot_so_kieu_CDN_anh\"><\/span>4. M\u1ed9t s\u1ed1 ki\u1ec3u CDN \u1ea3nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>CDN \u1ea3nh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh hai nh\u00f3m: t\u1ef1 qu\u1ea3n tr\u1ecb (self-managed) v\u00e0 b\u00ean th\u1ee9 ba qu\u1ea3n tr\u1ecb (third party managed).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"a-cdn-\u1ea3nh-t\u1ef1-qu\u1ea3n-tr\u1ecb\">A. CDN \u1ea3nh t\u1ef1 qu\u1ea3n tr\u1ecb<\/h3>\n\n\n\n<p>CDN t\u1ef1 qu\u1ea3n tr\u1ecb c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1t cho c\u00e1c trang c\u00f3 nh\u00e2n vi\u00ean k\u1ef9 thu\u1eadt &#8211; ng\u01b0\u1eddi c\u00f3 kh\u1ea3 n\u0103ng duy tr\u00ec c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng c\u1ee7a ri\u00eang h\u1ecd.<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/thumbor\/thumbor\" target=\"_blank\" rel=\"noreferrer noopener\">Thumbor<\/a> hi\u1ec7n l\u00e0 s\u1ea3n ph\u1ea9m CDN \u1ea3nh t\u1ef1 qu\u1ea3n tr\u1ecb duy nh\u1ea5t hi\u1ec7n c\u00f3- t\u00ednh \u0111\u1ebfn th\u1eddi \u0111i\u1ec3m n\u00e0y. N\u00f3 l\u00e0 d\u1ea1ng ngu\u1ed3n m\u1edf v\u00e0 cho ph\u00e9p s\u1eed d\u1ee5ng mi\u1ec5n ph\u00ed, nh\u00ecn chung Thumbor c\u00f3 \u00edt t\u00ednh n\u0103ng h\u01a1n ph\u1ea7n l\u1edbn c\u00e1c d\u1ecbch v\u1ee5 CDN th\u01b0\u01a1ng m\u1ea1i (tr\u1ea3 ph\u00ed), v\u00e0 t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn c\u1ee7a n\u00f3 c\u00f3 ph\u1ea7n h\u1ea1n ch\u1ebf.<\/p>\n\n\n\n<p>Wikipedia, Square v\u00e0 99designs l\u00e0 ba trang l\u1edbn hi\u1ec7n \u0111ang d\u00f9ng Thumbor. B\u1ea1n c\u00f3 th\u1ec3 t\u00ecm ki\u1ebfm tr\u00ean m\u1ea1ng c\u00e1ch c\u00e0i \u0111\u1eb7t CDN \u1ea3nh Thumbor \u0111\u1ec3 bi\u1ebft h\u01b0\u1edbng d\u1eabn thi\u1ebft l\u1eadp n\u00f3 (c\u00f3 th\u1ec3 t\u00f4i s\u1ebd d\u1ecbch sau).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"b-cdn-\u1ea3nh-c\u1ee7a-ben-th\u1ee9-ba\">B. CDN \u1ea3nh c\u1ee7a b\u00ean th\u1ee9 ba<\/h3>\n\n\n\n<p>CDN \u1ea3nh c\u1ee7a b\u00ean th\u1ee9 ba cung c\u1ea5p CDN cho \u1ea3nh d\u01b0\u1edbi d\u1ea1ng d\u1ecbch v\u1ee5. C\u0169ng gi\u1ed1ng nh\u01b0 c\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 cloud cung c\u1ea5p m\u00e1y ch\u1ee7 v\u00e0 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng c\u00f3 t\u00ednh ph\u00ed kh\u00e1c; <\/p>\n\n\n\n<p>CDN \u1ea3nh cung c\u1ea5p d\u1ecbch v\u1ee5 t\u1ed1i \u01b0u h\u00f3a v\u00e0 ph\u00e2n ph\u1ed1i \u1ea3nh c\u00f3 t\u00ednh ph\u00ed. V\u00ec CDN \u1ea3nh b\u00ean th\u1ee9 ba duy tr\u00ec c\u00f4ng ngh\u1ec7 c\u01a1 b\u1ea3n, vi\u1ec7c b\u1eaft \u0111\u1ea7u s\u1eed d\u1ee5ng n\u00f3 kh\u00e1 \u0111\u01a1n gi\u1ea3n v\u00e0 th\u01b0\u1eddng c\u00f3 th\u1ec3 ho\u00e0n th\u00e0nh trong 10-15 ph\u00fat, m\u1eb7c d\u00f9 vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i d\u1ecbch v\u1ee5 ho\u00e0n ch\u1ec9nh tr\u00ean c\u00e1c trang l\u1edbn c\u00f3 th\u1ec3 m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n. <\/p>\n\n\n\n<p>CDN \u1ea3nh c\u1ee7a b\u00ean th\u1ee9 ba th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1ecbnh gi\u00e1 d\u1ef1a tr\u00ean c\u00e1c c\u1ea5p s\u1eed d\u1ee5ng, v\u1edbi ph\u1ea7n l\u1edbn d\u1ecbch v\u1ee5 CDN \u1ea3nh cung c\u1ea5p m\u1ed9t c\u1ea5p mi\u1ec5n ph\u00ed ho\u1eb7c d\u1ecbch v\u1ee5 d\u00f9ng th\u1eed mi\u1ec5n ph\u00ed gi\u00fap b\u1ea1n c\u00f3 c\u01a1 h\u1ed9i tr\u1ea3i nghi\u1ec7m s\u1ea3n ph\u1ea9m c\u1ee7a h\u1ecd.<\/p>\n\n\n\n<p>M\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 CDN \u1ea3nh ch\u1ea5t l\u01b0\u1ee3ng m\u00e0 Ki\u1ebfn c\u00e0ng bi\u1ebft:<\/p>\n\n\n\n<ul><li><a href=\"https:\/\/cloudinary.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cloudinary<\/a>;<\/li><li><a href=\"https:\/\/imagekit.io\/\" target=\"_blank\" rel=\"noreferrer noopener\">ImageKit<\/a>;<\/li><li><a href=\"https:\/\/www.imgix.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Imgix<\/a>;<\/li><\/ul>\n\n\n\n<p>Trong \u0111\u00f3 hai c\u00e1i \u0111\u1ea7u c\u00f3 g\u00f3i mi\u1ec5n ph\u00ed tr\u1ecdn \u0111\u1eddi v\u1edbi dung l\u01b0\u1ee3ng CDN kho\u1ea3ng 20 GB \/ th\u00e1ng, \u0111\u1ee7 d\u00f9ng cho ph\u1ea7n l\u1edbn website.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"5-l\u1ef1a-ch\u1ecdn-d\u1ecbch-v\u1ee5-cdn-\u1ea3nh\"><span class=\"ez-toc-section\" id=\"5_Lua_chon_dich_vu_CDN_anh\"><\/span>5. L\u1ef1a ch\u1ecdn d\u1ecbch v\u1ee5 CDN \u1ea3nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00f3 nhi\u1ec1u t\u00f9y ch\u1ecdn t\u1ed1t cho vi\u1ec7c s\u1eed d\u1ee5ng CDN \u1ea3nh. M\u1ed9t s\u1ed1 c\u00f3 nhi\u1ec1u t\u00ednh n\u0103ng h\u01a1n c\u00e1i kh\u00e1c, nh\u01b0ng t\u1ea5t c\u1ea3 \u0111\u1ec1u c\u00f3 kh\u1ea3 n\u0103ng gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m nhi\u1ec1u byte \u1ea3nh v\u00e0 v\u00ec th\u1ebf gi\u00fap trang c\u1ee7a b\u1ea1n t\u1ea3i nhanh h\u01a1n. <\/p>\n\n\n\n<p>B\u00ean c\u1ea1nh b\u1ed9 t\u00ednh n\u0103ng, c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c c\u1ea7n xem x\u00e9t khi l\u1ef1a ch\u1ecdn CDN \u1ea3nh l\u00e0 chi ph\u00ed, kh\u1ea3 n\u0103ng h\u1ed7 tr\u1ee3, t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn, v\u00e0 vi\u1ec7c c\u00e0i \u0111\u1eb7t, chuy\u1ec3n \u0111\u1ed5i sang d\u1ecbch v\u1ee5 m\u1edbi (migration) d\u1ec5 d\u00e0ng.<\/p>\n\n\n\n<p>Th\u1eed s\u1eed d\u1ee5ng d\u1ecbch v\u1ee5 tr\u01b0\u1edbc khi quy\u1ebft \u0111\u1ecbnh d\u00f9ng hay kh\u00f4ng c\u0169ng c\u00f3 th\u1ec3 c\u00f3 \u00edch. Khu v\u1ef1c b\u00ean d\u01b0\u1edbi b\u1ea1n c\u00f3 th\u1ec3 t\u00ecm th\u1ea5y codelab (ph\u1ea7n n\u00e0y t\u00f4i ch\u01b0a d\u1ecbch) v\u1edbi c\u00e1c h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 nhanh ch\u00f3ng \u0111\u1ec3 b\u1eaft \u0111\u1ea7u thi\u1ebft l\u1eadp m\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 CDN \u1ea3nh.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p><strong>T\u01b0 v\u1ea5n t\u1eeb Ki\u1ebfn c\u00e0ng<\/strong>: n\u1ebfu b\u1ea1n kh\u00f4ng qu\u00e1 c\u1ea7u k\u1ef3 v\u1edbi c\u00e1c t\u1ed1i \u01b0u h\u00f3a \u1ea3nh chuy\u00ean s\u00e2u tr\u00ean trang WordPress th\u00ec th\u01b0\u1eddng vi\u1ec7c d\u00f9ng m\u1ed9t plugin t\u1ed1i \u01b0u \u1ea3nh (ho\u1eb7c <a href=\"https:\/\/kiencang.net\/toi-uu-anh-litespeed\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u00ednh n\u0103ng t\u01b0\u01a1ng t\u1ef1 c\u00f3 s\u1eb5n tr\u00ean plugin cache \/ v\u00ed d\u1ee5 LiteSpeed cache<\/a>) + d\u1ecbch v\u1ee5 CDN l\u00e0 \u0111\u1ee7 cho b\u1ea1n r\u1ed3i. \u0110\u1ec1 xu\u1ea5t: b\u1ea1n c\u00f3 th\u1ec3 <a href=\"https:\/\/kiencang.net\/gioi-thieu-bunnycdn\/\" target=\"_blank\" rel=\"noreferrer noopener\">d\u1ecbch v\u1ee5 c\u1ee7a BunnyCDN<\/a> \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c gi\u00e1 c\u1ea3 \u1ed5n &amp; ch\u1ea5t l\u01b0\u1ee3ng d\u1ecbch v\u1ee5 t\u1ed1t.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft Use image CDNs to optimize images, t\u00e1c gi\u1ea3: Katie Hempenius, trang: web[.]dev)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00f9ng CDN \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a \u1ea3nh kh\u00f4ng ph\u1ea3i bi\u1ec7n ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u1ea5t hi\u1ec7n nay, nh\u01b0ng m\u1ed9t s\u1ed1 website s\u1ebd th\u00edch n\u00f3, v\u00ed d\u1ee5 nh\u01b0 c\u00e1c trang c\u00f3 y\u00eau c\u1ea7u cao v\u1ec1 t\u00f9y bi\u1ebfn \u1ea3nh. 1. T\u1ea1i sao b\u1ea1n n\u00ean s\u1eed d\u1ee5ng CDN cho \u1ea3nh? M\u1ea1ng ph\u00e2n t\u00e1n n\u1ed9i dung \u1ea3nh l\u00e0 gi\u1ea3i ph\u00e1p &hellip;<\/p>\n","protected":false},"author":1,"featured_media":17904,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[252],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u1eed d\u1ee5ng CDN \u0111\u1ec3 t\u1ed1i \u01b0u \u1ea3nh &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"description\" content=\"CDN chuy\u00ean cho \u1ea3nh l\u00e0 gi\u1ea3i ph\u00e1p \u0111\u00e1ng \u0111\u1ed3ng ti\u1ec1n b\u00e1t g\u1ea1o. 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