{"id":11323,"date":"2021-12-17T10:29:00","date_gmt":"2021-12-17T03:29:00","guid":{"rendered":"http:\/\/www.ducanhplus.com\/?p=11323"},"modified":"2021-12-17T10:29:00","modified_gmt":"2021-12-17T03:29:00","slug":"can-bang-tai-cua-cloudflare","status":"publish","type":"post","link":"https:\/\/kiencang.net\/can-bang-tai-cua-cloudflare\/","title":{"rendered":"T\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i (load balancing) c\u1ee7a Cloudflare"},"content":{"rendered":"\n<p>M\u00e1y ch\u1ee7 b\u1ecb s\u1eed d\u1ee5ng qu\u00e1 t\u1ea3i (over-utilized) ho\u1eb7c qu\u00e1 xa (geographically distant) ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra \u0111\u1ed9 tr\u1ec5 kh\u00f4ng mong mu\u1ed1n v\u00e0 l\u00e0m suy gi\u1ea3m tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng duy\u1ec7t web (visitor experience). <\/p>\n\n\n<p>Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, m\u00e1y ch\u1ee7 kh\u00f4ng \u0111\u00e1ng tin c\u1eady ho\u1eb7c b\u1ecb c\u1ea5u h\u00ecnh sai l\u00e0m b\u1ecf l\u1eedng ho\u00e0n to\u00e0n c\u00e1c y\u00eau c\u1ea7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, ng\u0103n c\u1ea3n vi\u1ec7c truy c\u1eadp website, \u1ee9ng d\u1ee5ng web ho\u1eb7c API. Tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng ngh\u00e8o n\u00e0n nh\u01b0 v\u1eady \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn doanh thu, danh ti\u1ebfng, v\u00e0 s\u1ef1 trung th\u00e0nh c\u1ee7a kh\u00e1ch h\u00e0ng.<\/p>\n\n\n<p>\u0110\u01b0\u1ee3c m\u1edf r\u1ed9ng t\u1eeb c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng DNS v\u00e0 m\u1ea1ng Anycast to\u00e0n c\u1ea7u s\u1eb5n c\u00f3, c\u1ea5p cao c\u1ee7a Cloudflare, <em>Cloudflare Load Balancing<\/em> (C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare) gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng c\u00e1ch:<\/p>\n\n\n<ul><li><strong>C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng<\/strong> \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 tr\u1ec5 b\u1eb1ng c\u00e1ch c\u00e2n b\u1eb1ng t\u1ea3i l\u01b0u l\u01b0\u1ee3ng th\u00f4ng qua nhi\u1ec1u server ho\u1eb7c b\u1edfi vi\u1ec7c \u0111\u1ecbnh tuy\u1ebfn l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ebfn v\u1ecb tr\u00ed \u0111\u1ecba l\u00fd g\u1ea7n nh\u1ea5t (closest geolocation region).<\/li><li><strong>Ki\u1ec3m tra \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh\/s\u1ee9c kh\u1ecfe c\u1ee7a m\u00e1y ch\u1ee7 v\u1edbi chuy\u1ec3n \u0111\u1ed5i nhanh<\/strong>&nbsp;\u0111\u1ec3 nhanh ch\u00f3ng chuy\u1ec3n ng\u01b0\u1eddi d\u00f9ng ra kh\u1ecfi khu v\u1ef1c b\u1ecb l\u1ed7i (v\u00e0 chuy\u1ec3n h\u1ecd \u0111\u1ebfn ph\u1ea7n truy c\u1eadp b\u00ecnh th\u01b0\u1eddng)<\/li><\/ul>\n\n\n<p>Nigel Hepworth c\u1ee7a Active Solutions n\u00f3i r\u1eb1ng:<\/p>\n\n\n<blockquote class=\"wp-block-quote\"><p>Vi\u1ec7c k\u1ebft h\u1ee3p C\u00e2n b\u1eb1ng t\u1ea3i \u0111\u1ecba l\u00fd \u0111\u1ecbnh v\u1ecb (Load Balancing geolocation steering) v\u1edbi k\u1ef9 thu\u1eadt cache c\u1ee7a Cloudflare gi\u00fap \u0111\u1ea3m b\u1ea3o cho kh\u00e1ch h\u00e0ng nh\u1eadn \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 t\u1ea3i nhanh nh\u1ea5t c\u00f3 th\u1ec3.<\/p><\/blockquote>\n\n\n<hr class=\"wp-block-separator\"\/>\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-6577d623074de\" ><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-6577d623074de\"  type=\"checkbox\" id=\"item-6577d623074de\"><\/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\/can-bang-tai-cua-cloudflare\/#Can_bang_tai_toan_cau_va_dia_phuong_de_kiem_soat_luu_luong_truy_cap\" title=\"C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng \u0111\u1ec3 ki\u1ec3m so\u00e1t l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp\">C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng \u0111\u1ec3 ki\u1ec3m so\u00e1t l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp<\/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\/can-bang-tai-cua-cloudflare\/#Kiem_tra_do_on_dinh_va_nhanh_chong_chuyen_doi_du_phong_de_thoat_khoi_su_cham_tre_cua_DNS\" title=\"Ki\u1ec3m tra \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 nhanh ch\u00f3ng chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng \u0111\u1ec3 tho\u00e1t kh\u1ecfi s\u1ef1 ch\u1eadm tr\u1ec5 c\u1ee7a DNS\">Ki\u1ec3m tra \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 nhanh ch\u00f3ng chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng \u0111\u1ec3 tho\u00e1t kh\u1ecfi s\u1ef1 ch\u1eadm tr\u1ec5 c\u1ee7a 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:\/\/kiencang.net\/can-bang-tai-cua-cloudflare\/#Voi_Session_Affinity_ban_khong_can_phai_thay_doi_ung_dung\" title=\"V\u1edbi Session Affinity b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i thay \u0111\u1ed5i \u1ee9ng d\u1ee5ng\">V\u1edbi Session Affinity b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i thay \u0111\u1ed5i \u1ee9ng d\u1ee5ng<\/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\/can-bang-tai-cua-cloudflare\/#Ket_hop_nhieu_may_chu_giup_giam_nguy_co_bi_khoa_va_tranh_mat_dien\" title=\"K\u1ebft h\u1ee3p nhi\u1ec1u m\u00e1y ch\u1ee7 gi\u00fap gi\u1ea3m nguy c\u01a1 b\u1ecb kh\u00f3a v\u00e0 tr\u00e1nh m\u1ea5t \u0111i\u1ec7n\">K\u1ebft h\u1ee3p nhi\u1ec1u m\u00e1y ch\u1ee7 gi\u00fap gi\u1ea3m nguy c\u01a1 b\u1ecb kh\u00f3a v\u00e0 tr\u00e1nh m\u1ea5t \u0111i\u1ec7n<\/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\/can-bang-tai-cua-cloudflare\/#Cac_tinh_nang_chinh\" title=\"C\u00e1c t\u00ednh n\u0103ng ch\u00ednh\">C\u00e1c t\u00ednh n\u0103ng ch\u00ednh<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"can-b\u1eb1ng-t\u1ea3i-toan-c\u1ea7u-va-d\u1ecba-ph\u01b0\u01a1ng-d\u1ec3-ki\u1ec3m-soat-l\u01b0u-l\u01b0\u1ee3ng-truy-c\u1eadp\"><span class=\"ez-toc-section\" id=\"Can_bang_tai_toan_cau_va_dia_phuong_de_kiem_soat_luu_luong_truy_cap\"><\/span>C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng \u0111\u1ec3 ki\u1ec3m so\u00e1t l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/01\/loadbalance-screen.png\" alt=\"c\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare\" class=\"wp-image-11324\"\/><\/figure>\n\n\n<p>Cloudflare Load Balancing t\u1ef1 \u0111\u1ed9ng gi\u1ea3m \u0111\u1ed9 tr\u1ec5 b\u1eb1ng c\u00e1ch \u0111i\u1ec1u h\u01b0\u1edbng ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng g\u1ea7n h\u1ecd nh\u1ea5t: kh\u00e1ch h\u00e0ng \u1edf ch\u00e2u \u00c2u \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn trung t\u00e2m d\u1eef li\u1ec7u n\u1eb1m t\u1ea1i London, kh\u00e1ch h\u00e0ng \u1edf \u00dac \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn trung t\u00e2m d\u1eef li\u1ec7u n\u1eb1m t\u1ea1i Sydney, v\u00e2n v\u00e2n. <\/p>\n\n\n<p>C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u c\u1ee7a Cloudflare ch\u1ea1y tr\u00ean m\u1ea1ng <a href=\"https:\/\/kiencang.net\/anycast-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Anycast to\u00e0n c\u1ea7u c\u1ee7a Cloudflare<\/a> v\u00e0 \u0111\u1ea3m b\u1ea3o c\u00e1c y\u00eau c\u1ea7u g\u1ed1c cho n\u1ed9i dung \u0111\u1ed9ng c\u00f3 ngu\u1ed3n t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c ho\u1eb7c g\u1ea7n nh\u1ea5t v\u1edbi ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u tr\u1ecdng s\u1ed1 c\u1ee5 th\u1ec3.<\/p>\n\n\n<p>C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u c\u1ee7a Cloudflare ch\u1ea1y tr\u00ean to\u00e0n b\u1ed9 m\u1ea1ng l\u01b0\u1edbi c\u1ee7a Cloudflare v\u00e0 h\u1ed7 tr\u1ee3 b\u1ea5t k\u1ef3 giao th\u1ee9c n\u00e0o: t\u1eeb HTTP(S) cho \u0111\u1ebfn TCP v\u00e0 UDP d\u1ef1a tr\u00ean d\u1ecbch v\u1ee5 qua DNS ho\u1eb7c Spectrum. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m thi\u1ec3u va ch\u1ea1m gi\u1eefa b\u1ea5t k\u1ef3 d\u1ecbch v\u1ee5 \u0111\u00e3 \u0111\u01b0\u1ee3c tri\u1ec3n khai v\u1edbi c\u00e1c nh\u00e0 cung c\u1ea5p cloud kh\u00e1c.<\/p>\n\n\n<p>Val\u00e9rian Saliou t\u1eeb c\u00f4ng ty Crisp cho bi\u1ebft:<\/p>\n\n\n<blockquote class=\"wp-block-quote\"><p>T\u1eeb khi ch\u00fang t\u00f4i tri\u1ec3n khai C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare \u0111\u1ec3 \u0111\u1ecbnh h\u01b0\u1edbng l\u01b0u l\u01b0\u1ee3ng qua h\u1ec7 th\u1ed1ng m\u00e1y ch\u1ee7 websocket c\u1ee7a m\u00ecnh, ch\u00fang t\u00f4i ngay l\u1eadp t\u1ee9c nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o t\u1eeb c\u00e1c kh\u00e1ch h\u00e0ng \u1edf ch\u00e2u \u00c1 v\u00e0 ch\u00e2u \u0110\u1ea1i D\u01b0\u01a1ng, h\u1ecd mu\u1ed1n g\u1eedi l\u1eddi c\u1ea3m \u01a1n ch\u00fang t\u00f4i v\u00ec \u0111\u00e3 c\u1ea3i thi\u1ec7n, n\u00e2ng c\u1ea5p d\u1ecbch v\u1ee5.<\/p><\/blockquote>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"ki\u1ec3m-tra-d\u1ed9-\u1ed5n-d\u1ecbnh-va-nhanh-chong-chuy\u1ec3n-d\u1ed5i-d\u1ef1-phong-d\u1ec3-thoat-kh\u1ecfi-s\u1ef1-ch\u1eadm-tr\u1ec5-c\u1ee7a-dns\"><span class=\"ez-toc-section\" id=\"Kiem_tra_do_on_dinh_va_nhanh_chong_chuyen_doi_du_phong_de_thoat_khoi_su_cham_tre_cua_DNS\"><\/span>Ki\u1ec3m tra \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 nhanh ch\u00f3ng chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng \u0111\u1ec3 tho\u00e1t kh\u1ecfi s\u1ef1 ch\u1eadm tr\u1ec5 c\u1ee7a DNS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/01\/failover-graphic.gif\" alt=\"th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a server\" class=\"wp-image-11325\"\/><\/figure><\/div>\n\n\n<p>C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare \u0111\u01b0\u1ee3c bao g\u1ed3m s\u1eb5n t\u00ednh n\u0103ng theo d\u00f5i s\u1ee9c kh\u1ecfe c\u1ee7a m\u00e1y ch\u1ee7 g\u1ed1c t\u1eeb c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u c\u1ee7a Cloudflare kh\u1eafp tr\u00ean to\u00e0n c\u1ea7u. Th\u00f4ng qua truy v\u1ea5n \u0111\u1ecbnh k\u1ef3 c\u00e1c y\u00eau c\u1ea7u HTTP\/HTTPS, gi\u00e1m s\u00e1t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh cho c\u00e1c URL c\u1ee5 th\u1ec3 v\u1edbi kho\u1ea3ng th\u1eddi gian t\u00f9y ch\u1ec9nh, timeout v\u00e0 m\u00e3 tr\u1ea1ng th\u00e1i (status code). <\/p>\n\n\n<p>H\u1ec7 th\u1ed1ng ki\u1ec3m tra s\u1eb5n c\u00f3 ki\u1ec3m tra s\u1ee9c kh\u1ecfe c\u1ee7a m\u00e1y ch\u1ee7 g\u1ed1c th\u01b0\u1eddng xuy\u00ean theo nh\u1ecbp 15 gi\u00e2y m\u1ed7i l\u1ea7n, v\u1edbi b\u00e1o c\u00e1o th\u00f4ng qua email v\u00e0 REST API. V\u00e0i gi\u00e2y sau khi m\u00e1y ch\u1ee7 g\u1ed1c (origin server) \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u l\u00e0 c\u00f3 v\u1ea5n \u0111\u1ec1 th\u00ec b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn th\u00f4ng minh chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng \u0111a-v\u00f9ng s\u1ebd chuy\u1ec3n h\u01b0\u1edbng sang m\u00e1y ch\u1ee7 kh\u00e1c \u0111ang b\u00ecnh th\u01b0\u1eddng.<\/p>\n\n\n<p>C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi&nbsp;DDoS-resilient DNS c\u1ee7a Cloudflare, m\u1ed9t trong nh\u1eefng nh\u00e0 cung c\u1ea5p DNS nhanh nh\u1ea5t tr\u00ean to\u00e0n c\u1ea7u. Khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi <a href=\"https:\/\/kiencang.net\/proxy-nguoc-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">proxy ng\u01b0\u1ee3c<\/a> c\u1ee7a Cloudflare, do Cloudflare nhanh h\u01a1n c\u00e1c d\u1ecbch v\u1ee5 DNS c\u00f4ng c\u1ed9ng, Cloudflare gi\u00fap tr\u00e1nh ph\u1ea3i \u0111\u1ee3i th\u1eddi gian TTLs h\u1ebft h\u1ea1n.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"v\u1edbi-session-affinity-b\u1ea1n-khong-c\u1ea7n-ph\u1ea3i-thay-d\u1ed5i-\u1ee9ng-d\u1ee5ng\"><span class=\"ez-toc-section\" id=\"Voi_Session_Affinity_ban_khong_can_phai_thay_doi_ung_dung\"><\/span>V\u1edbi Session Affinity b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i thay \u0111\u1ed5i \u1ee9ng d\u1ee5ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/01\/session-affinity.png\" alt=\"session affinity\" class=\"wp-image-11328\"\/><\/figure><\/div>\n\n\n<p>V\u1edbi\u00a0Session Affinity &#8211; c\u00e1i th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 phi\u00ean d\u00ednh (sticky session), chuy\u1ec3n h\u01b0\u1edbng t\u1ea5t c\u1ea3 y\u00eau c\u1ea7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i (end-user) c\u1ee7a m\u1ed9t phi\u00ean t\u1edbi m\u1ed9t m\u00e1y ch\u1ee7 g\u1ed1c c\u1ee5 th\u1ec3. <\/p>\n\n\n<p>C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare ti\u1ebfp t\u1ee5c duy tr\u00ec session affinity b\u1eb1ng c\u00e1ch thi\u1ebft l\u1eadp m\u1ed9t cookie v\u1edbi \u0111\u00e1p \u1ee9ng ban \u0111\u1ea7u c\u1ee7a client (kh\u00e1ch duy\u1ec7t web).\u00a0Session Affinity c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t th\u00f4ng qua m\u1ed9t thay \u0111\u1ed5i c\u1ea5u h\u00ecnh \u0111\u01a1n gi\u1ea3n trong \u1ee9ng d\u1ee5ng C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n (dashboard) c\u1ee7a Cloudflare.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"k\u1ebft-h\u1ee3p-nhi\u1ec1u-may-ch\u1ee7-giup-gi\u1ea3m-nguy-c\u01a1-b\u1ecb-khoa-va-tranh-m\u1ea5t-di\u1ec7n\"><span class=\"ez-toc-section\" id=\"Ket_hop_nhieu_may_chu_giup_giam_nguy_co_bi_khoa_va_tranh_mat_dien\"><\/span>K\u1ebft h\u1ee3p nhi\u1ec1u m\u00e1y ch\u1ee7 gi\u00fap gi\u1ea3m nguy c\u01a1 b\u1ecb kh\u00f3a v\u00e0 tr\u00e1nh m\u1ea5t \u0111i\u1ec7n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/01\/tranh-mat-dien.png\" alt=\"gi\u1ea3m nguy c\u01a1 b\u1ecb kh\u00f3a v\u00e0 tr\u00e1nh m\u1ea5t \u0111i\u1ec7n\" class=\"wp-image-11326\"\/><\/figure><\/div>\n\n\n<p>C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u00f4ng qua nhi\u1ec1u nh\u00e0 cung c\u1ea5p c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u00e1y ch\u1ee7 kh\u00e1c nhau \u0111\u1ec3 gi\u1ea3m thi\u1ec3u t\u00e1c \u0111\u1ed9ng c\u1ee7a vi\u1ec7c gi\u00e1n \u0111o\u1ea1n c\u00f3 nguy\u00ean nh\u00e2n t\u1eeb m\u1ed9t nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 c\u00f3 v\u1ea5n \u0111\u1ec1.<\/p>\n\n\n<p>Kh\u00e1ch h\u00e0ng l\u1ef1a ch\u1ecdn m\u1ed9t nh\u00e0 cung c\u1ea5p ch\u00ednh \u0111\u1ec3 chuy\u1ec3n h\u01b0\u1edbng t\u1ea5t c\u1ea3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp qua \u0111\u00f3. M\u1ed9t khi l\u1ed7i \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n, C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n h\u01b0\u1edbng l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp v\u00e0o nh\u00e0 cung c\u1ea5p ho\u1eb7c khu v\u1ef1c d\u1ef1 ph\u00f2ng. <\/p>\n\n\n<p>L\u1ea5y v\u00ed d\u1ee5, n\u1ebfu m\u1ed9t m\u00e1y ch\u1ee7 g\u1eb7p s\u1ef1 c\u1ed1 m\u1ea5t \u0111i\u1ec7n ho\u1eb7c k\u1ebft n\u1ed1i m\u1ea1ng gi\u00e1n \u0111o\u1ea1n (c\u00f3 th\u1ec3 l\u00e0 AWS, Google Cloud, Microsoft Azure), ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 c\u01a1 s\u01a1 h\u1ea1 t\u1ea7ng m\u00e1y ch\u1ee7 c\u1ee7a ri\u00eang ch\u1ee7 web, C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n l\u01b0u l\u01b0\u1ee3ng \u0111\u1ebfn c\u00e1c m\u00e1y ch\u1ee7 ho\u1eb7c nh\u00e0 cung c\u1ea5p kh\u1ecfe m\u1ea1nh kh\u00e1c.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"cac-tinh-nang-chinh\"><span class=\"ez-toc-section\" id=\"Cac_tinh_nang_chinh\"><\/span>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<ul><li>T\u00f9y ch\u1ec9nh t\u1ea7n s\u1ed1 ki\u1ec3m tra s\u1ee9c kh\u1ecfe m\u00e1y ch\u1ee7.<\/li><li>Chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng nhanh (X gi\u00e2y).<\/li><li>Session affinity (phi\u00ean l\u00e0m vi\u1ec7c d\u00ednh).<\/li><li>Cung c\u1ea5p event logs chi ti\u1ebft cho c\u1ea3 m\u00e1y ch\u1ee7 g\u1ed1c v\u00e0 c\u00e1c pool.<\/li><li>L\u00e0m vi\u1ec7c \u0111\u01b0\u1ee3c v\u1edbi Argo Smart Routing (B\u1ed9 \u0111\u1ecbnh tuy\u1ebfn th\u00f4ng minh Argo).<\/li><li>T\u00f9y ch\u1ec9nh tr\u1ecdng s\u1ed1.<\/li><li>C\u00e2n b\u1eb1ng t\u1ea3i to\u00e0n c\u1ea7u v\u00e0 \u0111\u1ecba ph\u01b0\u01a1ng.<\/li><li>Th\u00f4ng b\u00e1o t\u00ecnh tr\u1ea1ng s\u1ee9c kh\u1ecfe c\u1ee7a m\u00e1y ch\u1ee7 th\u00f4ng qua email v\u00e0 REST API.<\/li><li>H\u1ed7 tr\u1ee3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp HTTP\/S.<\/li><li>\u0110\u1ecbnh tuy\u1ebfn \u0111\u1ecba l\u00fd \u0111\u1ebfn c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng g\u1ed1c.<\/li><li>Tr\u00e1nh tr\u1ec5 DNS lan truy\u1ec1n.<\/li><li>Bao g\u1ed3m b\u1ea3o v\u1ec7 <a href=\"https:\/\/kiencang.net\/cach-giam-ddos\/\" target=\"_blank\" rel=\"noreferrer noopener\">ch\u1ed1ng DDoS<\/a>.<\/li><li>H\u1ec7 th\u1ed1ng qu\u1ea3n tr\u1ecb DNS nhanh nh\u1ea5t th\u1ebf gi\u1edbi.<\/li><li>T\u00edch h\u1ee3p <a href=\"https:\/\/kiencang.net\/tinh-nang-cdn-cua-cloudflare\/\" target=\"_blank\" rel=\"noreferrer noopener\">m\u1ea1ng ph\u00e2n t\u00e1n n\u1ed9i dung CDN<\/a>.<\/li><li>H\u1ed7 tr\u1ee3 l\u01b0u l\u01b0\u1ee3ng l\u1edbp 4 v\u1edbi Spectrum.<\/li><\/ul>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft gi\u1edbi thi\u1ec7u d\u1ecbch v\u1ee5 C\u00e2n b\u1eb1ng t\u1ea3i c\u1ee7a Cloudflare)<\/em><\/p>\n\n\n<p>C\u00e1c b\u00e0i vi\u1ebft kh\u00e1c t\u00ecm hi\u1ec3u v\u1ec1 Cloudflare:<\/p>\n\n\n<ul><li><a href=\"https:\/\/kiencang.net\/tinh-nang-cdn-cua-cloudflare\/\">T\u00ednh n\u0103ng CDN c\u1ee7a Cloudflare<\/a><\/li><li><a href=\"https:\/\/kiencang.net\/toi-uu-hoa-web-cua-cloudflare\/\">D\u1ecbch v\u1ee5 t\u1ed1i \u01b0u h\u00f3a web c\u1ee7a Cloudflare<\/a><\/li><li><a href=\"https:\/\/kiencang.net\/dinh-tuyen-argo-cua-cloudflare\/\">B\u1ed9 \u0111\u1ecbnh tuy\u1ebfn th\u00f4ng minh c\u1ee7a Cloudflare<\/a><\/li><li><a href=\"https:\/\/kiencang.net\/huong-dan-su-dung-cloudflare\/\">H\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng Cloudflare<\/a><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>M\u00e1y ch\u1ee7 b\u1ecb s\u1eed d\u1ee5ng qu\u00e1 t\u1ea3i (over-utilized) ho\u1eb7c qu\u00e1 xa (geographically distant) ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra \u0111\u1ed9 tr\u1ec5 kh\u00f4ng mong mu\u1ed1n v\u00e0 l\u00e0m suy gi\u1ea3m tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng duy\u1ec7t web (visitor experience). Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, m\u00e1y ch\u1ee7 kh\u00f4ng \u0111\u00e1ng tin c\u1eady ho\u1eb7c b\u1ecb c\u1ea5u h\u00ecnh sai l\u00e0m b\u1ecf l\u1eedng ho\u00e0n &hellip;<\/p>\n","protected":false},"author":1,"featured_media":20458,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>T\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i (load balancing) c\u1ee7a Cloudflare &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/can-bang-tai-cua-cloudflare\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i (load balancing) c\u1ee7a Cloudflare &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"M\u00e1y ch\u1ee7 b\u1ecb s\u1eed d\u1ee5ng qu\u00e1 t\u1ea3i (over-utilized) ho\u1eb7c qu\u00e1 xa (geographically distant) ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra \u0111\u1ed9 tr\u1ec5 kh\u00f4ng mong mu\u1ed1n v\u00e0 l\u00e0m suy gi\u1ea3m tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng duy\u1ec7t web (visitor experience). Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, m\u00e1y ch\u1ee7 kh\u00f4ng \u0111\u00e1ng tin c\u1eady ho\u1eb7c b\u1ecb c\u1ea5u h\u00ecnh sai l\u00e0m b\u1ecf l\u1eedng ho\u00e0n &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/can-bang-tai-cua-cloudflare\/\" \/>\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=\"2021-12-17T03:29:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/01\/can-bang-tai-cloudflare.png\" \/>\n\t<meta property=\"og:image:width\" content=\"756\" \/>\n\t<meta property=\"og:image:height\" content=\"445\" \/>\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=\"6 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"T\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i (load balancing) c\u1ee7a Cloudflare &#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\/can-bang-tai-cua-cloudflare\/","og_locale":"vi_VN","og_type":"article","og_title":"T\u00ednh n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i (load balancing) c\u1ee7a Cloudflare &#8226; Ki\u1ebfn c\u00e0ng","og_description":"M\u00e1y ch\u1ee7 b\u1ecb s\u1eed d\u1ee5ng qu\u00e1 t\u1ea3i (over-utilized) ho\u1eb7c qu\u00e1 xa (geographically distant) ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra \u0111\u1ed9 tr\u1ec5 kh\u00f4ng mong mu\u1ed1n v\u00e0 l\u00e0m suy gi\u1ea3m tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng duy\u1ec7t web (visitor experience). 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