{"id":18426,"date":"2021-01-21T22:00:54","date_gmt":"2021-01-21T15:00:54","guid":{"rendered":"https:\/\/speed.family\/?p=18426"},"modified":"2023-07-23T19:54:39","modified_gmt":"2023-07-23T12:54:39","slug":"caching-la-gi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/caching-la-gi\/","title":{"rendered":"Caching l\u00e0 g\u00ec? V\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i gi\u00fap b\u1ea1n c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9, hi\u1ec7u su\u1ea5t website"},"content":{"rendered":"\n<p><strong>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi bi\u00ean t\u1eadp<\/strong>: trong b\u00e0i vi\u1ebft n\u00e0y ch\u00fang ta s\u1ebd hi\u1ec3u kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn caching, c\u1ea3 \u1edf c\u1ea5p \u0111\u1ed9 tr\u00ecnh duy\u1ec7t l\u1eabn h\u1ec7 th\u1ed1ng CDN. Gi\u1ea3i th\u00edch t\u1ea1i sao caching l\u1ea1i gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 truy c\u1eadp web. M\u1eb7c d\u00f9 \u0111\u00e2y l\u00e0 b\u00e0i vi\u1ebft c\u1ee7a Cloudflare, n\u00f3 c\u0169ng gi\u00fap ta hi\u1ec3u c\u01a1 ch\u1ebf caching c\u1ee7a c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>Caching (l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m) l\u00e0 qu\u00e1 tr\u00ecnh l\u01b0u tr\u1eef c\u00e1c b\u1ea3n sao file (g\u1ed3m nhi\u1ec1u \u0111\u1ecbnh d\u1ea1ng) v\u00e0o trong b\u1ed9 nh\u1edb cache, ho\u1eb7c v\u1ecb tr\u00ed l\u01b0u tr\u1eef t\u1ea1m th\u1eddi (temporary storage location), \u0111\u1ec3 ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp nhanh h\u01a1n. <\/p>\n\n\n\n<p>V\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, b\u1ed9 nh\u1edb cache l\u00e0 b\u1ea5t k\u1ef3 v\u1ecb tr\u00ed l\u01b0u tr\u1eef t\u1ea1m th\u1eddi n\u00e0o cho c\u00e1c b\u1ea3n sao c\u1ee7a t\u1ec7p ho\u1eb7c d\u1eef li\u1ec7u, nh\u01b0ng thu\u1eadt ng\u1eef n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ec9 c\u00e1c c\u00f4ng ngh\u1ec7 Internet. <\/p>\n\n\n\n<p>Tr\u00ecnh duy\u1ec7t web th\u1ef1c hi\u1ec7n l\u01b0u cache cho file HTML, JavaScript, v\u00e0 h\u00ecnh \u1ea3nh \u0111\u1ec3 trang web t\u1ea3i nhanh h\u01a1n, trong khi <a href=\"https:\/\/kiencang.net\/dns-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">m\u00e1y ch\u1ee7 DNS<\/a> th\u1ef1c hi\u1ec7n cache c\u00e1c b\u1ea3n ghi DNS cho m\u1ee5c \u0111\u00edch tra c\u1ee9u nhanh h\u01a1n, c\u00f2n <a href=\"https:\/\/kiencang.net\/cdn-la-gi\/\">CDN<\/a> th\u00ec cache n\u1ed9i dung \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 tr\u1ec5 (latency).<\/p>\n\n\n\n<p>\u0110\u1ec3 hi\u1ec3u c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 nh\u1edb \u0111\u1ec7m, h\u00e3y xem x\u00e9t v\u00ed d\u1ee5 v\u1ec1 &#8220;b\u1ed9 nh\u1edb \u0111\u1ec7m th\u1ef1c ph\u1ea9m v\u00e0 c\u00e1c ngu\u1ed3n cung kh\u00e1c&#8221; trong th\u1ebf gi\u1edbi th\u1ef1c \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o. Khi nh\u00e0 th\u00e1m hi\u1ec3m Roald Amundsen th\u1ef1c hi\u1ec7n chuy\u1ebfn h\u00e0nh tr\u00ecnh tr\u1edf v\u1ec1 t\u1eeb chuy\u1ebfn \u0111i \u0111\u1ebfn Nam C\u1ef1c v\u00e0o n\u0103m 1912, \u00f4ng v\u00e0 nh\u1eefng ng\u01b0\u1eddi c\u1ee7a m\u00ecnh \u0111\u00e3 s\u1ed1ng nh\u1edd v\u00e0o c\u00e1c kho th\u1ef1c ph\u1ea9m m\u00e0 h\u1ecd \u0111\u00e3 d\u1ef1 tr\u1eef tr\u00ean \u0111\u01b0\u1eddng \u0111i. \u0110i\u1ec1u n\u00e0y hi\u1ec7u qu\u1ea3 h\u01a1n nhi\u1ec1u so v\u1edbi vi\u1ec7c ch\u1edd \u0111\u1ee3i c\u00e1c ngu\u1ed3n cung c\u1ea5p \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ebfn tr\u1ea1i c\u0103n c\u1ee9 c\u1ee7a h\u1ecd khi h\u1ecd di chuy\u1ec3n. B\u1ed9 nh\u1edb cache tr\u00ean Internet ph\u1ee5c v\u1ee5 m\u1ee5c \u0111\u00edch t\u01b0\u01a1ng t\u1ef1, ch\u00fang t\u1ea1m th\u1eddi l\u01b0u tr\u1eef &#8216;ngu\u1ed3n cung&#8217; ho\u1eb7c n\u1ed9i dung c\u1ea7n thi\u1ebft \u0111\u1ec3 ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n h\u00e0nh tr\u00ecnh c\u1ee7a h\u1ecd tr\u00ean th\u1ebf gi\u1edbi web \/ internet.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-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-6577d74a92a5e\" ><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-6577d74a92a5e\"  type=\"checkbox\" id=\"item-6577d74a92a5e\"><\/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\/caching-la-gi\/#Bo_nho_cache_cua_trinh_duyet_co_nhiem_vu_gi\" title=\"B\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t c\u00f3 nhi\u1ec7m v\u1ee5 g\u00ec?\">B\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t c\u00f3 nhi\u1ec7m v\u1ee5 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:\/\/kiencang.net\/caching-la-gi\/#Xoa_bo_nho_cache_cua_trinh_duyet_se_thuc_hien_duoc_gi\" title=\"X\u00f3a b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t s\u1ebd th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c g\u00ec?\">X\u00f3a b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t s\u1ebd th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c 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\/caching-la-gi\/#CDN_caching_la_gi\" title=\"CDN caching l\u00e0 g\u00ec?\">CDN caching 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-4\" href=\"https:\/\/kiencang.net\/caching-la-gi\/#Cache_CDN_hit_la_gi_Cache_miss_la_gi\" title=\"Cache CDN hit l\u00e0 g\u00ec?&nbsp;Cache miss l\u00e0 g\u00ec?\">Cache CDN hit l\u00e0 g\u00ec?&nbsp;Cache miss 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-5\" href=\"https:\/\/kiencang.net\/caching-la-gi\/#May_chu_caching_CDN_duoc_dat_o_dau\" title=\"M\u00e1y ch\u1ee7 caching CDN \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf \u0111\u00e2u?\">M\u00e1y ch\u1ee7 caching CDN \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf \u0111\u00e2u?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/caching-la-gi\/#Du_lieu_da_luu_trong_bo_nho_cache_se_ton_tai_trong_may_chu_CDN_trong_bao_lau\" title=\"D\u1eef li\u1ec7u \u0111\u00e3 l\u01b0u trong b\u1ed9 nh\u1edb cache s\u1ebd t\u1ed3n t\u1ea1i trong m\u00e1y ch\u1ee7 CDN trong bao l\u00e2u?\">D\u1eef li\u1ec7u \u0111\u00e3 l\u01b0u trong b\u1ed9 nh\u1edb cache s\u1ebd t\u1ed3n t\u1ea1i trong m\u00e1y ch\u1ee7 CDN trong bao l\u00e2u?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/caching-la-gi\/#Cac_loai_bo_nho_dem_khac_hoat_dong_nhu_the_nao\" title=\"C\u00e1c lo\u1ea1i b\u1ed9 nh\u1edb \u0111\u1ec7m kh\u00e1c ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?\">C\u00e1c lo\u1ea1i b\u1ed9 nh\u1edb \u0111\u1ec7m kh\u00e1c ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kiencang.net\/caching-la-gi\/#Cloudflare_su_dung_bo_nho_dem_nhu_the_nao\" title=\"Cloudflare s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec7m nh\u01b0 th\u1ebf n\u00e0o?\">Cloudflare s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec7m nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"b\u1ed9-nh\u1edb-cache-c\u1ee7a-trinh-duy\u1ec7t-co-nhi\u1ec7m-v\u1ee5-gi\"><span class=\"ez-toc-section\" id=\"Bo_nho_cache_cua_trinh_duyet_co_nhiem_vu_gi\"><\/span>B\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t c\u00f3 nhi\u1ec7m v\u1ee5 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed7i khi ng\u01b0\u1eddi d\u00f9ng t\u1ea3i m\u1ed9t trang web, tr\u00ecnh duy\u1ec7t c\u1ee7a h\u1ecd ph\u1ea3i t\u1ea3i xu\u1ed1ng kh\u00e1 nhi\u1ec1u d\u1eef li\u1ec7u \u0111\u1ec3 hi\u1ec3n th\u1ecb trang web \u0111\u00f3.&nbsp;\u0110\u1ec3 r\u00fat ng\u1eafn&nbsp;th\u1eddi gian t\u1ea3i trang, <a href=\"https:\/\/kiencang.net\/bo-nho-dem-trinh-duyet\/\" target=\"_blank\" rel=\"noreferrer noopener\">tr\u00ecnh duy\u1ec7t l\u01b0u v\u00e0o b\u1ed9 nh\u1edb cache h\u1ea7u h\u1ebft n\u1ed9i dung xu\u1ea5t hi\u1ec7n tr\u00ean trang web<\/a>, l\u01b0u m\u1ed9t b\u1ea3n sao n\u1ed9i dung c\u1ee7a trang web v\u00e0o \u1ed5 c\u1ee9ng c\u1ee7a thi\u1ebft b\u1ecb.&nbsp;B\u1eb1ng c\u00e1ch n\u00e0y, l\u1ea7n sau khi ng\u01b0\u1eddi d\u00f9ng t\u1ea3i trang, h\u1ea7u h\u1ebft n\u1ed9i dung \u0111\u00e3 \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef c\u1ee5c b\u1ed9 v\u00e0 trang s\u1ebd t\u1ea3i nhanh h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n<p>Tr\u00ecnh duy\u1ec7t l\u01b0u tr\u1eef c\u00e1c t\u1ec7p n\u00e0y cho \u0111\u1ebfn khi h\u1ebft&nbsp;th\u1eddi gian t\u1ed3n t\u1ea1i (<a href=\"https:\/\/kiencang.net\/time-to-live-ttl-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">TTL \/ Time To Live<\/a>) c\u1ee7a ch\u00fang&nbsp;ho\u1eb7c cho \u0111\u1ebfn khi b\u1ed9 nh\u1edb cache c\u1ee7a \u1ed5 c\u1ee9ng \u0111\u1ea7y.&nbsp;(TTL l\u00e0 th\u00f4ng tin cho bi\u1ebft n\u1ed9i dung s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u trong b\u1ed9 nh\u1edb cache trong bao l\u00e2u). Ng\u01b0\u1eddi d\u00f9ng c\u0169ng c\u00f3 th\u1ec3 x\u00f3a b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t n\u1ebfu mu\u1ed1n.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xoa-b\u1ed9-nh\u1edb-cache-c\u1ee7a-trinh-duy\u1ec7t-s\u1ebd-th\u1ef1c-hi\u1ec7n-d\u01b0\u1ee3c-gi\"><span class=\"ez-toc-section\" id=\"Xoa_bo_nho_cache_cua_trinh_duyet_se_thuc_hien_duoc_gi\"><\/span>X\u00f3a b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t s\u1ebd th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sau khi b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t b\u1ecb x\u00f3a, m\u1ecdi trang web s\u1ebd t\u1ea3i nh\u01b0 th\u1ec3 \u0111\u00f3 l\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp trang.&nbsp;<\/p>\n\n\n\n<p>N\u1ebfu n\u1ed9i dung n\u00e0o \u0111\u00f3 \u0111\u01b0\u1ee3c t\u1ea3i kh\u00f4ng ch\u00ednh x\u00e1c trong l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m, vi\u1ec7c x\u00f3a b\u1ed9 nh\u1edb cache c\u00f3 th\u1ec3 gi\u00fap n\u00f3 t\u1ea3i ch\u00ednh x\u00e1c.&nbsp;<\/p>\n\n\n\n<p>Tuy nhi\u00ean, x\u00f3a b\u1ed9 nh\u1edb cache c\u1ee7a tr\u00ecnh duy\u1ec7t c\u0169ng c\u00f3 th\u1ec3 t\u1ea1m th\u1eddi l\u00e0m ch\u1eadm th\u1eddi gian t\u1ea3i trang.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cdn-caching-la-gi\"><span class=\"ez-toc-section\" id=\"CDN_caching_la_gi\"><\/span>CDN caching l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>CDN ho\u1eb7c m\u1ea1ng ph\u00e2n ph\u1ed1i n\u1ed9i dung, l\u01b0u tr\u1eef n\u1ed9i dung (ch\u1eb3ng h\u1ea1n nh\u01b0 h\u00ecnh \u1ea3nh, video ho\u1eb7c trang web) trong m\u00e1y ch\u1ee7 proxy \u0111\u01b0\u1ee3c \u0111\u1eb7t g\u1ea7n ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i h\u01a1n m\u00e1y ch\u1ee7 g\u1ed1c. (M\u00e1y ch\u1ee7 proxy l\u00e0 m\u00e1y ch\u1ee7 nh\u1eadn y\u00eau c\u1ea7u t\u1eeb m\u00e1y kh\u00e1ch v\u00e0 chuy\u1ec3n ch\u00fang \u0111\u1ebfn c\u00e1c m\u00e1y ch\u1ee7 kh\u00e1c). V\u00ec m\u00e1y ch\u1ee7 g\u1ea7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u h\u01a1n, CDN c\u00f3 th\u1ec3 ph\u00e2n ph\u1ed1i n\u1ed9i dung nhanh h\u01a1n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"465\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/caching-cdn-e1611241757191.png\" alt=\"caching CDN l\u00e0 g\u00ec\" class=\"wp-image-18438\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/caching-cdn-e1611241757191.png 700w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/caching-cdn-e1611241757191-300x199.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p>H\u00e3y ngh\u0129 v\u1ec1 m\u1ea1ng CDN gi\u1ed1ng nh\u01b0 m\u1ed9t chu\u1ed7i c\u00e1c c\u1eeda h\u00e0ng t\u1ea1p h\u00f3a: thay v\u00ec b\u1ea1n ph\u1ea3i \u0111i t\u1ea5t c\u1ea3 c\u00e1c trang tr\u1ea1i n\u01a1i th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c tr\u1ed3ng \u0111\u1ec3 l\u00e0m b\u1eefa t\u1ed1i- \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00ean \u0111\u1ebfn h\u00e0ng tr\u0103m kilomet, b\u1ea1n \u0111i \u0111\u1ebfn c\u1eeda h\u00e0ng t\u1ea1p h\u00f3a \u1edf \u0111\u1ecba ph\u01b0\u01a1ng c\u1ee7a b\u1ea1n, tuy r\u1eb1ng v\u1eabn ph\u1ea3i b\u01b0\u1edbc ra kh\u1ecfi nh\u00e0 \u0111\u1ea5y nh\u01b0ng g\u1ea7n h\u01a1n nhi\u1ec1u.&nbsp;<\/p>\n\n\n\n<p>B\u1edfi v\u00ec c\u00e1c c\u1eeda h\u00e0ng t\u1ea1p h\u00f3a d\u1ef1 tr\u1eef th\u1ef1c ph\u1ea9m t\u1eeb c\u00e1c trang tr\u1ea1i xa x\u00f4i, vi\u1ec7c mua s\u1eafm th\u1ef1c ph\u1ea9m do v\u1eady ch\u1ec9 m\u1ea5t v\u00e0i ph\u00fat thay v\u00ec v\u00e0i ng\u00e0y. T\u01b0\u01a1ng t\u1ef1, CDN l\u01b0u tr\u1eef &#8216;kho&#8217; n\u1ed9i dung xu\u1ea5t hi\u1ec7n tr\u00ean Internet \u0111\u1ec3 c\u00e1c trang web t\u1ea3i nhanh h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n<p>Khi ng\u01b0\u1eddi d\u00f9ng y\u00eau c\u1ea7u n\u1ed9i dung t\u1eeb m\u1ed9t trang web b\u1eb1ng CDN, CDN s\u1ebd t\u00ecm n\u1ea1p n\u1ed9i dung \u0111\u00f3 t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c, sau \u0111\u00f3 l\u01b0u b\u1ea3n sao n\u1ed9i dung cho c\u00e1c y\u00eau c\u1ea7u sau n\u00e0y. N\u1ed9i dung \u0111\u01b0\u1ee3c l\u01b0u trong b\u1ed9 \u0111\u1ec7m v\u1eabn c\u00f2n trong b\u1ed9 \u0111\u1ec7m CDN mi\u1ec5n l\u00e0 ng\u01b0\u1eddi d\u00f9ng ti\u1ebfp t\u1ee5c y\u00eau c\u1ea7u n\u1ed9i dung \u0111\u00f3.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cache-cdn-hit-la-gi-cache-miss-la-gi\"><span class=\"ez-toc-section\" id=\"Cache_CDN_hit_la_gi_Cache_miss_la_gi\"><\/span>Cache CDN hit l\u00e0 g\u00ec?&nbsp;Cache miss l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/kiencang.net\/cache-hit-ratio\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cache hit<\/a> l\u00e0 khi m\u1ed9t thi\u1ebft b\u1ecb m\u00e1y kh\u00e1ch th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi n\u1ed9i dung trong b\u1ed9 nh\u1edb cache v\u00e0 b\u1ed9 nh\u1edb cache \u0111\u00e3 l\u01b0u n\u1ed9i dung \u0111\u00f3. Cache miss x\u1ea3y ra khi b\u1ed9 nh\u1edb cache kh\u00f4ng c\u00f3 n\u1ed9i dung \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u.<\/p>\n\n\n\n<p>Khi c\u00f3 cache hit, c\u00f3 ngh\u0129a l\u00e0 n\u1ed9i dung s\u1ebd c\u00f3 th\u1ec3 t\u1ea3i nhanh h\u01a1n nhi\u1ec1u, v\u00ec CDN c\u00f3 th\u1ec3 ngay l\u1eadp t\u1ee9c cung c\u1ea5p n\u1ed9i dung \u0111\u00f3 cho ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i. <\/p>\n\n\n\n<p>Trong tr\u01b0\u1eddng h\u1ee3p b\u1ed9 nh\u1edb cache kh\u00f4ng c\u00f3 (cache miss), m\u00e1y ch\u1ee7 CDN s\u1ebd chuy\u1ec3n y\u00eau c\u1ea7u qua m\u00e1y ch\u1ee7 g\u1ed1c, sau \u0111\u00f3 l\u01b0u n\u1ed9i dung v\u00e0o b\u1ed9 nh\u1edb cache khi m\u00e1y ch\u1ee7 g\u1ed1c ph\u1ea3n h\u1ed3i, nh\u1edd \u0111\u00f3 <em>c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo<\/em> s\u1ebd d\u1eabn \u0111\u1ebfn vi\u1ec7c truy c\u1eadp b\u1ed9 nh\u1edb cache- t\u1ee9c l\u00e0 s\u1ebd nhanh h\u01a1n (cache hit).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"may-ch\u1ee7-caching-cdn-d\u01b0\u1ee3c-d\u1eb7t-\u1edf-dau\"><span class=\"ez-toc-section\" id=\"May_chu_caching_CDN_duoc_dat_o_dau\"><\/span>M\u00e1y ch\u1ee7 caching CDN \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf \u0111\u00e2u?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u00e1y ch\u1ee7 caching CDN \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u1ea1i&nbsp;c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u&nbsp;tr\u00ean to\u00e0n c\u1ea7u.&nbsp;Cloudflare c\u00f3 c\u00e1c m\u00e1y ch\u1ee7 CDN t\u1ea1i 200 th\u00e0nh ph\u1ed1 tr\u1ea3i r\u1ed9ng kh\u1eafp th\u1ebf gi\u1edbi \u0111\u1ec3 ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i truy c\u1eadp n\u1ed9i dung c\u00e0ng g\u1ea7n c\u00e0ng t\u1ed1t.&nbsp;V\u1ecb tr\u00ed c\u00f3 m\u00e1y ch\u1ee7 CDN c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 trung t\u00e2m d\u1eef li\u1ec7u (data center).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"d\u1eef-li\u1ec7u-da-l\u01b0u-trong-b\u1ed9-nh\u1edb-cache-s\u1ebd-t\u1ed3n-t\u1ea1i-trong-may-ch\u1ee7-cdn-trong-bao-lau\"><span class=\"ez-toc-section\" id=\"Du_lieu_da_luu_trong_bo_nho_cache_se_ton_tai_trong_may_chu_CDN_trong_bao_lau\"><\/span>D\u1eef li\u1ec7u \u0111\u00e3 l\u01b0u trong b\u1ed9 nh\u1edb cache s\u1ebd t\u1ed3n t\u1ea1i trong m\u00e1y ch\u1ee7 CDN trong bao l\u00e2u?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Khi c\u00e1c trang web ph\u1ea3n h\u1ed3i v\u1edbi m\u00e1y ch\u1ee7 CDN b\u1eb1ng n\u1ed9i dung \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u, ch\u00fang c\u0169ng \u0111\u00ednh k\u00e8m TTL c\u1ee7a n\u1ed9i dung \u0111\u00f3, cho m\u00e1y ch\u1ee7 CDN bi\u1ebft th\u1eddi gian l\u01b0u tr\u1eef n\u00f3. <\/p>\n\n\n\n<p>TTL \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong m\u1ed9t ph\u1ea7n c\u1ee7a ph\u1ea3n h\u1ed3i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0&nbsp;<a href=\"https:\/\/kiencang.net\/tim-hieu-http-caching\/\" target=\"_blank\" rel=\"noreferrer noopener\">HTTP header<\/a> v\u00e0 n\u00f3 ch\u1ec9 \u0111\u1ecbnh n\u1ed9i dung s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u trong b\u1ed9 nh\u1edb cache trong bao nhi\u00eau gi\u00e2y, ph\u00fat ho\u1eb7c gi\u1edd. Khi TTL h\u1ebft h\u1ea1n, b\u1ed9 nh\u1edb \u0111\u1ec7m s\u1ebd x\u00f3a n\u1ed9i dung. <\/p>\n\n\n\n<p>M\u1ed9t s\u1ed1 CDN c\u0169ng s\u1ebd s\u1edbm x\u00f3a c\u00e1c t\u1ec7p kh\u1ecfi b\u1ed9 \u0111\u1ec7m <strong>n\u1ebfu n\u1ed9i dung kh\u00f4ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u trong m\u1ed9t kho\u1ea3ng th\u1eddi gian n\u00e0o \u0111\u1ea5y ho\u1eb7c n\u1ebfu kh\u00e1ch h\u00e0ng CDN t\u1ef1 x\u00f3a n\u1ed9i dung nh\u1ea5t \u0111\u1ecbnh theo c\u00e1ch th\u1ee7 c\u00f4ng<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cac-lo\u1ea1i-b\u1ed9-nh\u1edb-d\u1ec7m-khac-ho\u1ea1t-d\u1ed9ng-nh\u01b0-th\u1ebf-nao\"><span class=\"ez-toc-section\" id=\"Cac_loai_bo_nho_dem_khac_hoat_dong_nhu_the_nao\"><\/span>C\u00e1c lo\u1ea1i b\u1ed9 nh\u1edb \u0111\u1ec7m kh\u00e1c ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>B\u1ed9 nh\u1edb \u0111\u1ec7m DNS<\/strong> di\u1ec5n ra tr\u00ean c\u00e1c m\u00e1y ch\u1ee7 DNS. C\u00e1c m\u00e1y ch\u1ee7 l\u01b0u tr\u1eef c\u00e1c tra c\u1ee9u DNS g\u1ea7n \u0111\u00e2y trong b\u1ed9 nh\u1edb cache c\u1ee7a ch\u00fang \u0111\u1ec3 ch\u00fang kh\u00f4ng ph\u1ea3i truy v\u1ea5n m\u00e1y ch\u1ee7 \u0111\u1ecbnh danh (nameservers) v\u00e0 c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi ngay l\u1eadp t\u1ee9c \u0111\u1ecba ch\u1ec9 IP&nbsp;c\u1ee7a m\u1ed9t t\u00ean mi\u1ec1n.<\/p>\n\n\n\n<p><strong>C\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm<\/strong> c\u00f3 th\u1ec3 l\u01b0u v\u00e0o b\u1ed9 nh\u1edb cache c\u00e1c trang web th\u01b0\u1eddng xuy\u00ean xu\u1ea5t hi\u1ec7n trong k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e1c truy v\u1ea5n c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ngay c\u1ea3 khi trang web m\u00e0 h\u1ecd \u0111ang c\u1ed1 truy c\u1eadp t\u1ea1m th\u1eddi ng\u1eebng ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c kh\u00f4ng th\u1ec3 ph\u1ea3n h\u1ed3i.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"cloudflare-s\u1eed-d\u1ee5ng-b\u1ed9-nh\u1edb-d\u1ec7m-nh\u01b0-th\u1ebf-nao\"><span class=\"ez-toc-section\" id=\"Cloudflare_su_dung_bo_nho_dem_nhu_the_nao\"><\/span>Cloudflare s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec7m nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Cloudflare&nbsp;cung c\u1ea5p h\u1ec7 th\u1ed1ng CDN v\u1edbi h\u01a1n 200 PoP \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i tr\u00ean to\u00e0n c\u1ea7u. Cloudflare cung c\u1ea5p d\u1ecbch v\u1ee5 caching CDN mi\u1ec5n ph\u00ed, trong khi kh\u00e1ch h\u00e0ng CDN tr\u1ea3 ph\u00ed c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh c\u00e1ch n\u1ed9i dung c\u1ee7a h\u1ecd \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m. <\/p>\n\n\n\n<p><a href=\"https:\/\/kiencang.net\/anycast-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">M\u1ea1ng l\u00e0 Anycast<\/a>, c\u00f3 ngh\u0129a l\u00e0 c\u00f9ng m\u1ed9t n\u1ed9i dung c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i t\u1eeb b\u1ea5t k\u1ef3 trung t\u00e2m d\u1eef li\u1ec7u n\u00e0o trong s\u1ed1 n\u00e0y. M\u1ed9t ng\u01b0\u1eddi s\u1eed d\u1ee5ng \u1edf London v\u00e0 ng\u01b0\u1eddi d\u00f9ng \u1edf Sydney, c\u1ea3 hai c\u00f3 th\u1ec3 xem c\u00f9ng m\u1ed9t n\u1ed9i dung \u0111\u01b0\u1ee3c t\u1ea3i t\u1eeb m\u00e1y ch\u1ee7 CDN ch\u1ec9 c\u00e1ch c\u00f3 m\u1ed9t v\u00e0i km.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft <a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/what-is-caching\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">What is caching? c\u1ee7a Cloudflare<\/a>)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi bi\u00ean t\u1eadp: trong b\u00e0i vi\u1ebft n\u00e0y ch\u00fang ta s\u1ebd hi\u1ec3u kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn caching, c\u1ea3 \u1edf c\u1ea5p \u0111\u1ed9 tr\u00ecnh duy\u1ec7t l\u1eabn h\u1ec7 th\u1ed1ng CDN. Gi\u1ea3i th\u00edch t\u1ea1i sao caching l\u1ea1i gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 truy c\u1eadp web. M\u1eb7c d\u00f9 \u0111\u00e2y l\u00e0 b\u00e0i vi\u1ebft c\u1ee7a Cloudflare, n\u00f3 c\u0169ng &hellip;<\/p>\n","protected":false},"author":1,"featured_media":21371,"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>Caching l\u00e0 g\u00ec? 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M\u1eb7c d\u00f9 \u0111\u00e2y l\u00e0 b\u00e0i vi\u1ebft c\u1ee7a Cloudflare, n\u00f3 c\u0169ng &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/caching-la-gi\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-01-21T15:00:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-23T12:54:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/cache.png\" \/>\n\t<meta property=\"og:image:width\" content=\"640\" \/>\n\t<meta property=\"og:image:height\" content=\"306\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Caching l\u00e0 g\u00ec? V\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i gi\u00fap b\u1ea1n c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9, hi\u1ec7u su\u1ea5t website &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/caching-la-gi\/","og_locale":"vi_VN","og_type":"article","og_title":"Caching l\u00e0 g\u00ec? V\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i gi\u00fap b\u1ea1n c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9, hi\u1ec7u su\u1ea5t website &#8226; Ki\u1ebfn c\u00e0ng","og_description":"V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi bi\u00ean t\u1eadp: trong b\u00e0i vi\u1ebft n\u00e0y ch\u00fang ta s\u1ebd hi\u1ec3u kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn caching, c\u1ea3 \u1edf c\u1ea5p \u0111\u1ed9 tr\u00ecnh duy\u1ec7t l\u1eabn h\u1ec7 th\u1ed1ng CDN. 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