{"id":29258,"date":"2025-05-28T16:58:03","date_gmt":"2025-05-28T09:58:03","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=29258"},"modified":"2025-09-06T15:50:25","modified_gmt":"2025-09-06T08:50:25","slug":"load-balancing","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/load-balancing\/","title":{"rendered":"Load Balancing l\u00e0 g\u00ec? T\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng v\u1edbi k\u1ef9 thu\u1eadt ph\u00e2n t\u1ea3i"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/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\"><span class=\"ez-toc-js-icon-con\"><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><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Load-Balancing-la-gi\" >Load Balancing 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-2\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Tai-sao-Load-Balancing-lai-quan-trong\" >T\u1ea1i sao Load Balancing l\u1ea1i quan tr\u1ecdng?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Toi-uu-hieu-suat-va-toc-do\" >T\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1c \u0111\u1ed9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Tang-tinh-san-sang-cao-High-Availability\" >T\u0103ng t\u00ednh s\u1eb5n s\u00e0ng cao (High Availability)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Tang-kha-nang-mo-rong-Scalability\" >T\u0103ng kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng (Scalability)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Cac-thuat-toan-Load-Balancing-pho-bien\" >C\u00e1c thu\u1eadt to\u00e1n Load Balancing ph\u1ed5 bi\u1ebfn<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Round-Robin-Xoay-vong\" >Round Robin (Xoay v\u00f2ng)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Least-Connections-It-ket-noi-nhat\" >Least Connections (\u00cdt k\u1ebft n\u1ed1i nh\u1ea5t)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#IP-Hash\" >IP Hash<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Weighted-Round-Robin-Xoay-vong-co-trong-so\" >Weighted Round Robin (Xoay v\u00f2ng c\u00f3 tr\u1ecdng s\u1ed1)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Load-Balancer-hoat-dong-nhu-the-nao\" >Load Balancer 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-12\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Phan-loai-Load-Balancer\" >Ph\u00e2n lo\u1ea1i Load Balancer<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Layer-4-vs-Layer-7-Load-Balancing\" >Layer 4 vs Layer 7 Load Balancing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Hardware-Load-Balancer-vs-Software-Load-Balancer\" >Hardware Load Balancer vs Software Load Balancer<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Ung-dung-thuc-te-cua-Load-Balancing\" >\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a Load Balancing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Cac-cong-cu-Load-Balancer-pho-bien\" >C\u00e1c c\u00f4ng c\u1ee5 Load Balancer ph\u1ed5 bi\u1ebfn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Cach-trien-khai-Load-Balancing-hieu-qua\" >C\u00e1ch tri\u1ec3n khai Load Balancing hi\u1ec7u qu\u1ea3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/load-balancing\/#Ket-luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<p>B\u1ea1n \u0111\u00e3 bao gi\u1edd truy c\u1eadp m\u1ed9t trang web b\u00e1n h\u00e0ng trong \u0111\u1ee3t khuy\u1ebfn m\u00e3i l\u1edbn v\u00e0 ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o l\u1ed7i &#8220;trang web kh\u00f4ng th\u1ec3 truy c\u1eadp&#8221;? Ho\u1eb7c m\u1ed9t \u1ee9ng d\u1ee5ng b\u1ea1n \u0111ang d\u00f9ng b\u1ed7ng nhi\u00ean ch\u1eadm \u0111i \u0111\u00e1ng k\u1ec3 v\u00e0o gi\u1edd cao \u0111i\u1ec3m? \u0110\u00e2y l\u00e0 nh\u1eefng d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng b\u1ecb qu\u00e1 t\u1ea3i, n\u01a1i m\u1ed9t m\u00e1y ch\u1ee7 duy nh\u1ea5t ph\u1ea3i g\u1ed3ng g\u00e1nh to\u00e0n b\u1ed9 y\u00eau c\u1ea7u t\u1eeb ng\u01b0\u1eddi d\u00f9ng. Gi\u1ea3i ph\u00e1p cho v\u1ea5n \u0111\u1ec1 n\u00e0y ch\u00ednh l\u00e0 <a href=\"https:\/\/interdata.vn\/blog\/load-balancing\/\"><strong>Load Balancing<\/strong><\/a>.<\/p>\n<p>T\u1ea1i <a href=\"https:\/\/interdata.vn\/\"><strong>InterData<\/strong><\/a>, ch\u00fang t\u00f4i hi\u1ec3u r\u1eb1ng hi\u1ec7u su\u1ea5t v\u00e0 s\u1ef1 \u1ed5n \u0111\u1ecbnh l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a m\u1ecdi d\u1ecbch v\u1ee5 tr\u1ef1c tuy\u1ebfn. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u1ea3i th\u00edch chi ti\u1ebft v\u1ec1 Load Balancing, m\u1ed9t k\u1ef9 thu\u1eadt kh\u00f4ng th\u1ec3 thi\u1ebfu trong ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Load-Balancing-la-gi\"><\/span>Load Balancing l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Load Balancing, hay c\u00f2n g\u1ecdi l\u00e0 c\u00e2n b\u1eb1ng t\u1ea3i, l\u00e0 qu\u00e1 tr\u00ecnh ph\u00e2n ph\u1ed1i \u0111\u1ed3ng \u0111\u1ec1u l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp m\u1ea1ng ho\u1eb7c \u1ee9ng d\u1ee5ng tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 kh\u00e1c nhau. Thay v\u00ec d\u1ed3n to\u00e0n b\u1ed9 y\u00eau c\u1ea7u v\u00e0o m\u1ed9t m\u00e1y ch\u1ee7 duy nh\u1ea5t, b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i s\u1ebd \u0111\u1ee9ng ra l\u00e0m trung gian, \u0111i\u1ec1u ph\u1ed1i v\u00e0 chuy\u1ec3n ti\u1ebfp c\u00e1c y\u00eau c\u1ea7u n\u00e0y \u0111\u1ebfn m\u1ed9t nh\u00f3m c\u00e1c m\u00e1y ch\u1ee7 (server pool).<\/p>\n<p>H\u00e3y h\u00ecnh dung Load Balancer nh\u01b0 m\u1ed9t ng\u01b0\u1eddi c\u1ea3nh s\u00e1t giao th\u00f4ng th\u00f4ng minh t\u1ea1i m\u1ed9t ng\u00e3 t\u01b0 \u0111\u00f4ng \u0111\u00fac. Thay v\u00ec \u0111\u1ec3 t\u1ea5t c\u1ea3 c\u00e1c xe d\u1ed3n v\u00e0o m\u1ed9t con \u0111\u01b0\u1eddng g\u00e2y t\u1eafc ngh\u1ebdn, ng\u01b0\u1eddi c\u1ea3nh s\u00e1t s\u1ebd ph\u00e2n lu\u1ed3ng, h\u01b0\u1edbng c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n \u0111i v\u00e0o nh\u1eefng con \u0111\u01b0\u1eddng kh\u00e1c th\u00f4ng tho\u00e1ng h\u01a1n. M\u1ee5c ti\u00eau cu\u1ed1i c\u00f9ng l\u00e0 \u0111\u1ea3m b\u1ea3o d\u00f2ng ch\u1ea3y giao th\u00f4ng lu\u00f4n su\u00f4n s\u1ebb. T\u01b0\u01a1ng t\u1ef1, Load Balancing \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 m\u00e1y ch\u1ee7 n\u00e0o ph\u1ea3i l\u00e0m vi\u1ec7c qu\u00e1 s\u1ee9c trong khi c\u00e1c m\u00e1y ch\u1ee7 kh\u00e1c l\u1ea1i nh\u00e0n r\u1ed7i, t\u1eeb \u0111\u00f3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-32997\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-Balancing-1.jpg\" alt=\"Load Balancing 1\" width=\"600\" height=\"439\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-Balancing-1.jpg 1024w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-Balancing-1-300x220.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-Balancing-1-768x563.jpg 768w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tai-sao-Load-Balancing-lai-quan-trong\"><\/span>T\u1ea1i sao Load Balancing l\u1ea1i quan tr\u1ecdng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c \u00e1p d\u1ee5ng c\u00e2n b\u1eb1ng t\u1ea3i kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t c\u1ea3i ti\u1ebfn k\u1ef9 thu\u1eadt, m\u00e0 c\u00f2n l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh chi\u1ebfn l\u01b0\u1ee3c mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch thi\u1ebft th\u1ef1c cho h\u1ec7 th\u1ed1ng v\u00e0 doanh nghi\u1ec7p.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Toi-uu-hieu-suat-va-toc-do\"><\/span>T\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1c \u0111\u1ed9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi m\u1ed9t m\u00e1y ch\u1ee7 ph\u1ea3i x\u1eed l\u00fd qu\u00e1 nhi\u1ec1u y\u00eau c\u1ea7u c\u00f9ng l\u00fac, th\u1eddi gian ph\u1ea3n h\u1ed3i s\u1ebd ch\u1eadm l\u1ea1i \u0111\u00e1ng k\u1ec3. Ng\u01b0\u1eddi d\u00f9ng s\u1ebd ph\u1ea3i ch\u1edd \u0111\u1ee3i l\u00e2u h\u01a1n \u0111\u1ec3 trang web t\u1ea3i xong ho\u1eb7c \u0111\u1ec3 \u1ee9ng d\u1ee5ng th\u1ef1c hi\u1ec7n m\u1ed9t t\u00e1c v\u1ee5. B\u1eb1ng c\u00e1ch ph\u00e2n chia c\u00f4ng vi\u1ec7c cho nhi\u1ec1u m\u00e1y ch\u1ee7, Load Balancing gi\u00fap gi\u1ea3m t\u1ea3i cho t\u1eebng m\u00e1y ch\u1ee7 ri\u00eang l\u1ebb. K\u1ebft qu\u1ea3 l\u00e0 h\u1ec7 th\u1ed1ng x\u1eed l\u00fd y\u00eau c\u1ea7u nhanh h\u01a1n, mang l\u1ea1i tr\u1ea3i nghi\u1ec7m m\u01b0\u1ee3t m\u00e0 v\u00e0 t\u00edch c\u1ef1c cho ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tang-tinh-san-sang-cao-High-Availability\"><\/span>T\u0103ng t\u00ednh s\u1eb5n s\u00e0ng cao (High Availability)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>R\u1ee7i ro l\u1edbn nh\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng ch\u1ec9 c\u00f3 m\u1ed9t m\u00e1y ch\u1ee7 l\u00e0 khi m\u00e1y ch\u1ee7 \u0111\u00f3 g\u1eb7p s\u1ef1 c\u1ed1 (l\u1ed7i ph\u1ea7n c\u1ee9ng, ph\u1ea7n m\u1ec1m, b\u1ea3o tr\u00ec), to\u00e0n b\u1ed9 d\u1ecbch v\u1ee5 s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. Load Balancing gi\u1ea3i quy\u1ebft tri\u1ec7t \u0111\u1ec3 v\u1ea5n \u0111\u1ec1 n\u00e0y. B\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i c\u00f3 kh\u1ea3 n\u0103ng ki\u1ec3m tra &#8220;s\u1ee9c kh\u1ecfe&#8221; c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7 trong nh\u00f3m. N\u1ebfu ph\u00e1t hi\u1ec7n m\u1ed9t m\u00e1y ch\u1ee7 n\u00e0o \u0111\u00f3 kh\u00f4ng ph\u1ea3n h\u1ed3i, n\u00f3 s\u1ebd ngay l\u1eadp t\u1ee9c ng\u1eebng g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u00f3 v\u00e0 chuy\u1ec3n h\u01b0\u1edbng to\u00e0n b\u1ed9 l\u01b0u l\u01b0\u1ee3ng sang c\u00e1c m\u00e1y ch\u1ee7 c\u00f2n l\u1ea1i. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng lu\u00f4n ho\u1ea1t \u0111\u1ed9ng 24\/7, ngay c\u1ea3 khi c\u00f3 s\u1ef1 c\u1ed1 x\u1ea3y ra v\u1edbi m\u1ed9t th\u00e0nh ph\u1ea7n ri\u00eang l\u1ebb.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tang-kha-nang-mo-rong-Scalability\"><\/span>T\u0103ng kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng (Scalability)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nhu c\u1ea7u kinh doanh lu\u00f4n thay \u0111\u1ed5i. H\u00f4m nay h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n ph\u1ee5c v\u1ee5 1,000 ng\u01b0\u1eddi d\u00f9ng, nh\u01b0ng sau m\u1ed9t chi\u1ebfn d\u1ecbch marketing th\u00e0nh c\u00f4ng, con s\u1ed1 \u0111\u00f3 c\u00f3 th\u1ec3 t\u0103ng l\u00ean 100,000. V\u1edbi ki\u1ebfn tr\u00fac c\u00e2n b\u1eb1ng t\u1ea3i, b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u0103ng c\u01b0\u1eddng n\u0103ng l\u1ef1c h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch th\u00eam m\u00e1y ch\u1ee7 m\u1edbi v\u00e0o nh\u00f3m (m\u1edf r\u1ed9ng theo chi\u1ec1u ngang &#8211; horizontal scaling). Qu\u00e1 tr\u00ecnh n\u00e0y ho\u00e0n to\u00e0n kh\u00f4ng l\u00e0m gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5, gi\u00fap h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n linh ho\u1ea1t th\u00edch \u1ee9ng v\u1edbi s\u1ef1 t\u0103ng tr\u01b0\u1edfng l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-thuat-toan-Load-Balancing-pho-bien\"><\/span>C\u00e1c thu\u1eadt to\u00e1n Load Balancing ph\u1ed5 bi\u1ebfn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>B\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n kh\u00e1c nhau \u0111\u1ec3 quy\u1ebft \u0111\u1ecbnh xem n\u00ean g\u1eedi y\u00eau c\u1ea7u ti\u1ebfp theo \u0111\u1ebfn m\u00e1y ch\u1ee7 n\u00e0o. Vi\u1ec7c l\u1ef1a ch\u1ecdn thu\u1eadt to\u00e1n ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-29262\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh1.jpg\" alt=\"Load balancing\" width=\"600\" height=\"600\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh1.jpg 600w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh1-300x300.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh1-150x150.jpg 150w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh1-75x75.jpg 75w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh1-350x350.jpg 350w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Round-Robin-Xoay-vong\"><\/span>Round Robin (Xoay v\u00f2ng)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 thu\u1eadt to\u00e1n \u0111\u01a1n gi\u1ea3n nh\u1ea5t. C\u00e1c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i l\u1ea7n l\u01b0\u1ee3t \u0111\u1ebfn t\u1eebng m\u00e1y ch\u1ee7 trong danh s\u00e1ch theo m\u1ed9t v\u00f2ng l\u1eb7p. M\u00e1y ch\u1ee7 \u0111\u1ea7u ti\u00ean nh\u1eadn y\u00eau c\u1ea7u 1, m\u00e1y ch\u1ee7 th\u1ee9 hai nh\u1eadn y\u00eau c\u1ea7u 2, v\u00e0 c\u1ee9 th\u1ebf cho \u0111\u1ebfn h\u1ebft danh s\u00e1ch r\u1ed3i quay l\u1ea1i t\u1eeb \u0111\u1ea7u.<\/p>\n<ul>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong> D\u1ec5 tri\u1ec3n khai, ph\u00e2n ph\u1ed1i \u0111\u1ec1u s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong> Kh\u00f4ng xem x\u00e9t \u0111\u1ebfn t\u1ea3i th\u1ef1c t\u1ebf hay n\u0103ng l\u1ef1c x\u1eed l\u00fd c\u1ee7a t\u1eebng m\u00e1y ch\u1ee7. M\u1ed9t m\u00e1y ch\u1ee7 m\u1ea1nh v\u00e0 m\u1ed9t m\u00e1y ch\u1ee7 y\u1ebfu \u0111\u1ec1u nh\u1eadn s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u nh\u01b0 nhau.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Least-Connections-It-ket-noi-nhat\"><\/span>Least Connections (\u00cdt k\u1ebft n\u1ed1i nh\u1ea5t)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Thu\u1eadt to\u00e1n n\u00e0y th\u00f4ng minh h\u01a1n m\u1ed9t ch\u00fat. B\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i s\u1ebd ki\u1ec3m tra xem m\u00e1y ch\u1ee7 n\u00e0o \u0111ang c\u00f3 \u00edt k\u1ebft n\u1ed1i ho\u1ea1t \u0111\u1ed9ng nh\u1ea5t v\u00e0 g\u1eedi y\u00eau c\u1ea7u m\u1edbi \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u00f3. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y gi\u00fap ph\u00e2n ph\u1ed1i t\u1ea3i \u0111\u1ed3ng \u0111\u1ec1u h\u01a1n d\u1ef1a tr\u00ean t\u00ecnh tr\u1ea1ng b\u1eadn r\u1ed9n th\u1ef1c t\u1ebf c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7.<\/p>\n<ul>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong> Ph\u00e2n ph\u1ed1i t\u1ea3i hi\u1ec7u qu\u1ea3 h\u01a1n Round Robin, \u0111\u1eb7c bi\u1ec7t khi c\u00e1c y\u00eau c\u1ea7u c\u00f3 th\u1eddi gian x\u1eed l\u00fd kh\u00e1c nhau.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong> C\u1ea7n theo d\u00f5i s\u1ed1 l\u01b0\u1ee3ng k\u1ebft n\u1ed1i tr\u00ean m\u1ed7i m\u00e1y ch\u1ee7.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"IP-Hash\"><\/span>IP Hash<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>V\u1edbi thu\u1eadt to\u00e1n n\u00e0y, b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i s\u1ebd th\u1ef1c hi\u1ec7n m\u1ed9t ph\u00e9p t\u00ednh b\u0103m (hash) d\u1ef1a tr\u00ean \u0111\u1ecba ch\u1ec9 IP c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 ch\u1ecdn ra m\u00e1y ch\u1ee7 x\u1eed l\u00fd. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c y\u00eau c\u1ea7u t\u1eeb c\u00f9ng m\u1ed9t ng\u01b0\u1eddi d\u00f9ng s\u1ebd lu\u00f4n \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn c\u00f9ng m\u1ed9t m\u00e1y ch\u1ee7.<\/p>\n<ul>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong> H\u1eefu \u00edch cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n duy tr\u00ec tr\u1ea1ng th\u00e1i phi\u00ean l\u00e0m vi\u1ec7c (session persistence), v\u00ed d\u1ee5 nh\u01b0 gi\u1ecf h\u00e0ng tr\u00ean trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed ho\u1eb7c phi\u00ean \u0111\u0103ng nh\u1eadp ng\u00e2n h\u00e0ng.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong> C\u00f3 th\u1ec3 g\u00e2y ra ph\u00e2n ph\u1ed1i t\u1ea3i kh\u00f4ng \u0111\u1ec1u n\u1ebfu m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn t\u1eeb c\u00f9ng m\u1ed9t d\u1ea3i IP (v\u00ed d\u1ee5 nh\u01b0 m\u1ed9t v\u0103n ph\u00f2ng l\u1edbn).<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Weighted-Round-Robin-Xoay-vong-co-trong-so\"><\/span>Weighted Round Robin (Xoay v\u00f2ng c\u00f3 tr\u1ecdng s\u1ed1)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 phi\u00ean b\u1ea3n n\u00e2ng c\u1ea5p c\u1ee7a Round Robin. Qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 g\u00e1n m\u1ed9t &#8220;tr\u1ecdng s\u1ed1&#8221; cho m\u1ed7i m\u00e1y ch\u1ee7 d\u1ef1a tr\u00ean n\u0103ng l\u1ef1c x\u1eed l\u00fd c\u1ee7a ch\u00fang (CPU, RAM). M\u00e1y ch\u1ee7 c\u00f3 tr\u1ecdng s\u1ed1 cao h\u01a1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t t\u1ef7 l\u1ec7 y\u00eau c\u1ea7u l\u1edbn h\u01a1n. V\u00ed d\u1ee5, m\u00e1y ch\u1ee7 A c\u00f3 tr\u1ecdng s\u1ed1 3 v\u00e0 m\u00e1y ch\u1ee7 B c\u00f3 tr\u1ecdng s\u1ed1 1, th\u00ec trong 4 y\u00eau c\u1ea7u, m\u00e1y ch\u1ee7 A s\u1ebd nh\u1eadn 3 v\u00e0 m\u00e1y ch\u1ee7 B nh\u1eadn 1.<\/p>\n<ul>\n<li><strong>\u01afu \u0111i\u1ec3m:<\/strong> T\u1eadn d\u1ee5ng t\u1ed1i \u0111a n\u0103ng l\u1ef1c c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u v\u1ec1 c\u1ea5u h\u00ecnh.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong> Y\u00eau c\u1ea7u c\u1ea5u h\u00ecnh th\u1ee7 c\u00f4ng v\u00e0 \u0111\u00e1nh gi\u00e1 \u0111\u00fang n\u0103ng l\u1ef1c c\u1ee7a m\u00e1y ch\u1ee7.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Load-Balancer-hoat-dong-nhu-the-nao\"><\/span>Load Balancer ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Quy tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ed9t b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i di\u1ec5n ra r\u1ea5t nhanh v\u00e0 ho\u00e0n to\u00e0n v\u00f4 h\u00ecnh \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<ol>\n<li>Ng\u01b0\u1eddi d\u00f9ng (client) g\u1eedi m\u1ed9t y\u00eau c\u1ea7u (v\u00ed d\u1ee5: truy c\u1eadp v\u00e0o m\u1ed9t trang web). Y\u00eau c\u1ea7u n\u00e0y kh\u00f4ng \u0111i th\u1eb3ng \u0111\u1ebfn m\u00e1y ch\u1ee7 web m\u00e0 \u0111i \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 c\u1ee7a Load Balancer.<\/li>\n<li>Load Balancer ti\u1ebfp nh\u1eadn y\u00eau c\u1ea7u. D\u1ef1a tr\u00ean thu\u1eadt to\u00e1n \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh (v\u00ed d\u1ee5: Least Connections), n\u00f3 s\u1ebd ch\u1ecdn ra m\u00e1y ch\u1ee7 ph\u00f9 h\u1ee3p nh\u1ea5t trong nh\u00f3m (server pool) \u0111\u1ec3 x\u1eed l\u00fd y\u00eau c\u1ea7u n\u00e0y.<\/li>\n<li>Load Balancer chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ecdn.<\/li>\n<li>M\u00e1y ch\u1ee7 web x\u1eed l\u00fd y\u00eau c\u1ea7u v\u00e0 g\u1eedi k\u1ebft qu\u1ea3 ph\u1ea3n h\u1ed3i (v\u00ed d\u1ee5: n\u1ed9i dung trang web) tr\u1edf l\u1ea1i cho Load Balancer.<\/li>\n<li>Load Balancer nh\u1eadn ph\u1ea3n h\u1ed3i v\u00e0 chuy\u1ec3n ti\u1ebfp n\u00f3 v\u1ec1 cho ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ol>\n<p>To\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 v\u00e0 nhanh ch\u00f3ng nh\u1ea5t.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-29263\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh2.jpg\" alt=\"Load balancing hinh2\" width=\"600\" height=\"434\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh2.jpg 600w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh2-300x217.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Load-balancing-hinh2-120x86.jpg 120w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Phan-loai-Load-Balancer\"><\/span>Ph\u00e2n lo\u1ea1i Load Balancer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 ph\u00e2n lo\u1ea1i c\u00e1c b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i, nh\u01b0ng hai c\u00e1ch ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 d\u1ef1a tr\u00ean t\u1ea7ng ho\u1ea1t \u0111\u1ed9ng (OSI model) v\u00e0 d\u1ef1a tr\u00ean h\u00ecnh th\u1ee9c tri\u1ec3n khai (ph\u1ea7n c\u1ee9ng hay ph\u1ea7n m\u1ec1m).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Layer-4-vs-Layer-7-Load-Balancing\"><\/span>Layer 4 vs Layer 7 Load Balancing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Layer 4 (T\u1ea7ng Giao V\u1eadn):<\/strong> B\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i Layer 4 ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng giao v\u1eadn, \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh \u0111\u1ecbnh tuy\u1ebfn d\u1ef1a tr\u00ean th\u00f4ng tin trong g\u00f3i tin m\u1ea1ng nh\u01b0 \u0111\u1ecba ch\u1ec9 IP ngu\u1ed3n\/\u0111\u00edch v\u00e0 c\u1ed5ng. Ch\u00fang ho\u1ea1t \u0111\u1ed9ng nhanh v\u00ec kh\u00f4ng c\u1ea7n ki\u1ec3m tra n\u1ed9i dung c\u1ee7a g\u00f3i tin. Tuy nhi\u00ean, ch\u00fang kh\u00f4ng th\u1ec3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh d\u1ef1a tr\u00ean lo\u1ea1i n\u1ed9i dung y\u00eau c\u1ea7u.<\/li>\n<li><strong>Layer 7 (T\u1ea7ng \u1ee8ng D\u1ee5ng):<\/strong> B\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i Layer 7 ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng \u1ee9ng d\u1ee5ng, cho ph\u00e9p ch\u00fang ki\u1ec3m tra n\u1ed9i dung c\u1ee7a y\u00eau c\u1ea7u, ch\u1eb3ng h\u1ea1n nh\u01b0 URL, headers, cookies. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p \u0111\u1ecbnh tuy\u1ebfn th\u00f4ng minh h\u01a1n. V\u00ed d\u1ee5, t\u1ea5t c\u1ea3 y\u00eau c\u1ea7u h\u00ecnh \u1ea3nh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u1ed9t nh\u00f3m m\u00e1y ch\u1ee7 chuy\u00ean d\u1ee5ng, trong khi c\u00e1c y\u00eau c\u1ea7u x\u1eed l\u00fd giao d\u1ecbch \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u1ed9t nh\u00f3m kh\u00e1c.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Hardware-Load-Balancer-vs-Software-Load-Balancer\"><\/span>Hardware Load Balancer vs Software Load Balancer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Hardware Load Balancer (Ph\u1ea7n c\u1ee9ng):<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c thi\u1ebft b\u1ecb v\u1eadt l\u00fd chuy\u00ean d\u1ee5ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 cung c\u1ea5p hi\u1ec7u n\u0103ng c\u1ef1c cao. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u l\u1edbn c\u1ee7a doanh nghi\u1ec7p. Tuy nhi\u00ean, ch\u00fang c\u00f3 chi ph\u00ed cao v\u00e0 k\u00e9m linh ho\u1ea1t.<\/li>\n<li><strong>Software Load Balancer (Ph\u1ea7n m\u1ec1m):<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t tr\u00ean m\u00e1y ch\u1ee7 th\u00f4ng th\u01b0\u1eddng ho\u1eb7c m\u00e1y \u1ea3o. C\u00e1c gi\u1ea3i ph\u00e1p nh\u01b0 Nginx hay HAProxy r\u1ea5t ph\u1ed5 bi\u1ebfn, mang l\u1ea1i s\u1ef1 linh ho\u1ea1t cao, chi ph\u00ed th\u1ea5p h\u01a1n v\u00e0 r\u1ea5t ph\u00f9 h\u1ee3p v\u1edbi m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Ung-dung-thuc-te-cua-Load-Balancing\"><\/span>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a Load Balancing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00e2n b\u1eb1ng t\u1ea3i \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i trong h\u1ea7u h\u1ebft c\u00e1c h\u1ec7 th\u1ed1ng tr\u1ef1c tuy\u1ebfn hi\u1ec7n nay:<\/p>\n<ul>\n<li><strong>Website th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed:<\/strong> X\u1eed l\u00fd h\u00e0ng ng\u00e0n l\u01b0\u1ee3t truy c\u1eadp \u0111\u1ed3ng th\u1eddi trong c\u00e1c s\u1ef1 ki\u1ec7n gi\u1ea3m gi\u00e1 nh\u01b0 Black Friday.<\/li>\n<li><strong>\u1ee8ng d\u1ee5ng SaaS (Ph\u1ea7n m\u1ec1m nh\u01b0 m\u1ed9t d\u1ecbch v\u1ee5):<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c n\u1ec1n t\u1ea3ng nh\u01b0 CRM, email marketing, c\u00f4ng c\u1ee5 qu\u1ea3n l\u00fd d\u1ef1 \u00e1n lu\u00f4n \u1ed5n \u0111\u1ecbnh v\u00e0 s\u1eb5n s\u00e0ng cho h\u00e0ng tri\u1ec7u ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u:<\/strong> Ph\u00e2n ph\u1ed1i c\u00e1c truy v\u1ea5n \u0111\u1ecdc \u0111\u1ebfn nhi\u1ec1u m\u00e1y ch\u1ee7 c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u00e2n b\u1ea3n (read replicas) \u0111\u1ec3 gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7 ch\u00ednh.<\/li>\n<li><strong>M\u1ea1ng ph\u00e2n ph\u1ed1i n\u1ed9i dung (CDN):<\/strong> \u0110i\u1ec1u h\u01b0\u1edbng ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn m\u00e1y ch\u1ee7 g\u1ea7n nh\u1ea5t v\u1ec1 m\u1eb7t \u0111\u1ecba l\u00fd \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i n\u1ed9i dung.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cac-cong-cu-Load-Balancer-pho-bien\"><\/span>C\u00e1c c\u00f4ng c\u1ee5 Load Balancer ph\u1ed5 bi\u1ebfn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Nginx:<\/strong> Ban \u0111\u1ea7u l\u00e0 m\u1ed9t m\u00e1y ch\u1ee7 web, Nginx \u0111\u00e3 ph\u00e1t tri\u1ec3n m\u1ea1nh m\u1ebd v\u00e0 tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng gi\u1ea3i ph\u00e1p c\u00e2n b\u1eb1ng t\u1ea3i ph\u1ea7n m\u1ec1m, reverse proxy ph\u1ed5 bi\u1ebfn nh\u1ea5t th\u1ebf gi\u1edbi nh\u1edd hi\u1ec7u n\u0103ng cao v\u00e0 c\u1ea5u h\u00ecnh linh ho\u1ea1t.<\/li>\n<li><strong>HAProxy:<\/strong> M\u1ed9t gi\u1ea3i ph\u00e1p m\u00e3 ngu\u1ed3n m\u1edf chuy\u00ean d\u1ee5ng cho c\u00e2n b\u1eb1ng t\u1ea3i TCP\/HTTP. HAProxy n\u1ed5i ti\u1ebfng v\u1ec1 s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c x\u1eed l\u00fd l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp l\u1edbn.<\/li>\n<li><strong>AWS Elastic Load Balancing (ELB):<\/strong> D\u1ecbch v\u1ee5 c\u00e2n b\u1eb1ng t\u1ea3i \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd ho\u00e0n to\u00e0n c\u1ee7a Amazon Web Services, t\u00edch h\u1ee3p s\u00e2u v\u1edbi h\u1ec7 sinh th\u00e1i AWS, t\u1ef1 \u0111\u1ed9ng co gi\u00e3n theo l\u01b0u l\u01b0\u1ee3ng.<\/li>\n<li><strong>Azure Load Balancer:<\/strong> D\u1ecbch v\u1ee5 t\u01b0\u01a1ng t\u1ef1 c\u1ee7a Microsoft Azure, cung c\u1ea5p kh\u1ea3 n\u0103ng c\u00e2n b\u1eb1ng t\u1ea3i hi\u1ec7u su\u1ea5t cao cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean n\u1ec1n t\u1ea3ng Azure.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cach-trien-khai-Load-Balancing-hieu-qua\"><\/span>C\u00e1ch tri\u1ec3n khai Load Balancing hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ch\u1ec9 c\u00e0i \u0111\u1eb7t m\u1ed9t b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i l\u00e0 ch\u01b0a \u0111\u1ee7. \u0110\u1ec3 h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u01b0u, b\u1ea1n c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn m\u1ed9t v\u00e0i y\u1ebfu t\u1ed1 quan tr\u1ecdng:<\/p>\n<ul>\n<li><strong>C\u1ea5u h\u00ecnh Health Checks:<\/strong> \u0110\u00e2y l\u00e0 ch\u1ee9c n\u0103ng cho ph\u00e9p b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i t\u1ef1 \u0111\u1ed9ng ki\u1ec3m tra t\u00ecnh tr\u1ea1ng c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7. N\u1ebfu m\u1ed9t m\u00e1y ch\u1ee7 kh\u00f4ng v\u01b0\u1ee3t qua b\u00e0i ki\u1ec3m tra, n\u00f3 s\u1ebd t\u1ea1m th\u1eddi b\u1ecb lo\u1ea1i ra kh\u1ecfi nh\u00f3m cho \u0111\u1ebfn khi ho\u1ea1t \u0111\u1ed9ng tr\u1edf l\u1ea1i b\u00ecnh th\u01b0\u1eddng.<\/li>\n<li><strong>S\u1eed d\u1ee5ng Session Persistence khi c\u1ea7n thi\u1ebft:<\/strong> Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp v\u1edbi thu\u1eadt to\u00e1n IP Hash, \u0111\u1ea3m b\u1ea3o ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi c\u00f9ng m\u1ed9t m\u00e1y ch\u1ee7 trong su\u1ed1t phi\u00ean l\u00e0m vi\u1ec7c l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng.<\/li>\n<li><strong>C\u1ea5u h\u00ecnh SSL\/TLS Termination:<\/strong> Thay v\u00ec \u0111\u1ec3 m\u1ed7i m\u00e1y ch\u1ee7 web ph\u1ea3i x\u1eed l\u00fd vi\u1ec7c m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 SSL\/TLS, b\u1ea1n c\u00f3 th\u1ec3 t\u1eadp trung c\u00f4ng vi\u1ec7c n\u00e0y t\u1ea1i b\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m t\u1ea3i cho c\u00e1c m\u00e1y ch\u1ee7 backend, gi\u00fap ch\u00fang t\u1eadp trung v\u00e0o vi\u1ec7c x\u1eed l\u00fd logic \u1ee9ng d\u1ee5ng.<\/li>\n<li><strong>Gi\u00e1m s\u00e1t v\u00e0 ghi log:<\/strong> Lu\u00f4n theo d\u00f5i c\u00e1c ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t nh\u01b0 th\u1eddi gian ph\u1ea3n h\u1ed3i, s\u1ed1 l\u01b0\u1ee3ng k\u1ebft n\u1ed1i, t\u00ecnh tr\u1ea1ng c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7 \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh \u0111i\u1ec1u ch\u1ec9nh k\u1ecbp th\u1eddi.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Ket-luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Trong b\u1ed1i c\u1ea3nh k\u1ef9 thu\u1eadt s\u1ed1 ng\u00e0y nay, Load Balancing kh\u00f4ng c\u00f2n l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn m\u00e0 \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n c\u1ee7a m\u1ecdi ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc. Vi\u1ec7c \u00e1p d\u1ee5ng c\u00e2n b\u1eb1ng t\u1ea3i gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 t\u1ed1c \u0111\u1ed9, \u0111\u1ed9 tin c\u1eady v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 c\u1ea5u h\u00ecnh gi\u1ea3i ph\u00e1p c\u00e2n b\u1eb1ng t\u1ea3i ph\u00f9 h\u1ee3p l\u00e0 m\u1ed9t b\u01b0\u1edbc \u0111i chi\u1ebfn l\u01b0\u1ee3c, quy\u1ebft \u0111\u1ecbnh s\u1ef1 th\u00e0nh c\u00f4ng v\u00e0 \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ea1 t\u1ea7ng s\u1ed1. <strong>InterData<\/strong> lu\u00f4n s\u1eb5n s\u00e0ng \u0111\u1ed3ng h\u00e0nh c\u00f9ng doanh nghi\u1ec7p \u0111\u1ec3 x\u00e2y d\u1ef1ng nh\u1eefng h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd v\u00e0 \u0111\u00e1ng tin c\u1eady.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea1n \u0111\u00e3 bao gi\u1edd truy c\u1eadp m\u1ed9t trang web b\u00e1n h\u00e0ng trong \u0111\u1ee3t khuy\u1ebfn m\u00e3i l\u1edbn v\u00e0 ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o l\u1ed7i &#8220;trang web kh\u00f4ng th\u1ec3 truy c\u1eadp&#8221;? Ho\u1eb7c m\u1ed9t \u1ee9ng d\u1ee5ng b\u1ea1n \u0111ang d\u00f9ng b\u1ed7ng nhi\u00ean ch\u1eadm \u0111i \u0111\u00e1ng k\u1ec3 v\u00e0o gi\u1edd cao \u0111i\u1ec3m? \u0110\u00e2y l\u00e0 nh\u1eefng d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng<\/p>\n","protected":false},"author":2,"featured_media":29267,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48],"tags":[],"class_list":["post-29258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-server"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/29258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=29258"}],"version-history":[{"count":6,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/29258\/revisions"}],"predecessor-version":[{"id":32998,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/29258\/revisions\/32998"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/29267"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=29258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=29258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=29258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}