{"id":38847,"date":"2026-01-31T11:02:27","date_gmt":"2026-01-31T04:02:27","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=38847"},"modified":"2026-01-31T11:06:30","modified_gmt":"2026-01-31T04:06:30","slug":"elastic-ip-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/","title":{"rendered":"Elastic IP l\u00e0 g\u00ec? C\u00e1ch ho\u1ea1t \u0111\u1ed9ng, L\u1ee3i \u00edch &#038; khi n\u00e0o n\u00ean d\u00f9ng EIP"},"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\/elastic-ip-la-gi\/#Elastic-IP-la-gi\" >Elastic IP 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\/elastic-ip-la-gi\/#Elastic-IP-hoat-dong-nhu-the-nao-trong-AWS\" >Elastic IP ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o trong AWS?<\/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\/elastic-ip-la-gi\/#Phan-biet-cac-loai-IP-tren-AWS\" >Ph\u00e2n bi\u1ec7t c\u00e1c lo\u1ea1i IP tr\u00ean AWS<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Tai-sao-can-su-dung-Elastic-IP\" >T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng Elastic IP?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#1-Khac-phuc-su-thay-doi-IP-khi-StopStart-Instance\" >1. Kh\u1eafc ph\u1ee5c s\u1ef1 thay \u0111\u1ed5i IP khi Stop\/Start Instance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#2-High-Availability-Tinh-san-sang-cao-va-Failover\" >2. High Availability (T\u00ednh s\u1eb5n s\u00e0ng cao) v\u00e0 Failover<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#3-Whitelist-Firewall-Cau-hinh-tuong-lua-doi-tac\" >3. Whitelist Firewall (C\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda \u0111\u1ed1i t\u00e1c)<\/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\/elastic-ip-la-gi\/#4-SEO-Email-Marketing-IP-Reputation\" >4. SEO &amp; Email Marketing (IP Reputation)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#So-sanh-Public-IP-va-Elastic-IP-Comparison\" >So s\u00e1nh Public IP v\u00e0 Elastic IP (Comparison)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Khi-nao-nen-va-khong-nen-dung-Elastic-IP\" >Khi n\u00e0o n\u00ean v\u00e0 kh\u00f4ng n\u00ean d\u00f9ng Elastic IP?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Truong-hop-NEN-dung-Recommended\" >Tr\u01b0\u1eddng h\u1ee3p N\u00caN d\u00f9ng (Recommended)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Truong-hop-KHONG-NEN-dung-Not-Recommended\" >Tr\u01b0\u1eddng h\u1ee3p KH\u00d4NG N\u00caN d\u00f9ng (Not Recommended)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Nhung-luu-y-quan-trong-khi-su-dung-Elastic-IP\" >Nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng Elastic IP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Cac-cau-hoi-thuong-gap-FAQs\" >C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQs)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#1-Elastic-IP-co-lam-thay-doi-Private-IP-cua-instance-khong\" >1. Elastic IP c\u00f3 l\u00e0m thay \u0111\u1ed5i Private IP c\u1ee7a instance kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#2-Toi-co-the-phuc-hoi-Elastic-IP-da-lo-tay-Release-khong\" >2. T\u00f4i c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i Elastic IP \u0111\u00e3 l\u1ee1 tay Release kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#3-Tai-sao-toi-khong-ket-noi-duoc-SSH-sau-khi-gan-Elastic-IP\" >3. T\u1ea1i sao t\u00f4i kh\u00f4ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c SSH sau khi g\u00e1n Elastic IP?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#4-Dung-Elastic-IP-co-anh-huong-den-toc-do-mang-khong\" >4. D\u00f9ng Elastic IP c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 m\u1ea1ng kh\u00f4ng?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/elastic-ip-la-gi\/#Ket-luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"summary\"><span style=\"color: #0000ff;\"><strong>T\u00f3m t\u1eaft n\u1ed9i dung:<\/strong><\/span><br \/>\n<strong>Elastic IP<\/strong> (EIP) l\u00e0 gi\u1ea3i ph\u00e1p \u0111\u1ecba ch\u1ec9 IPv4 t\u0129nh \u0111\u01b0\u1ee3c Amazon Web Services (AWS) cung c\u1ea5p \u0111\u1ec3 kh\u1eafc ph\u1ee5c nh\u01b0\u1ee3c \u0111i\u1ec3m thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 m\u1ea1ng m\u1ed7i khi kh\u1edfi \u0111\u1ed9ng l\u1ea1i m\u00e1y ch\u1ee7 \u1ea3o (EC2).<br \/>\n<strong><em style=\"color: #555555;\">Th\u00f4ng tin tr\u1ecdng t\u00e2m:<\/em><\/strong><\/p>\n<ul>\n<li><strong>Elastic IP Address (EIP)<\/strong>: M\u1ed9t \u0111\u1ecba ch\u1ec9 IPv4 c\u00f4ng khai, t\u0129nh v\u00e0 c\u1ed1 \u0111\u1ecbnh, \u0111\u01b0\u1ee3c g\u00e1n cho t\u00e0i kho\u1ea3n AWS thay v\u00ec m\u1ed9t m\u00e1y ch\u1ee7 c\u1ee5 th\u1ec3.<\/li>\n<li><strong>C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng<\/strong>: Ph\u00e2n b\u1ed5 Elastic IP -&gt; G\u1eafn v\u00e0 th\u00e1o Elastic IP -&gt; Chuy\u1ec3n Elastic IP gi\u1eefa c\u00e1c instance -&gt; Qu\u1ea3n l\u00fd Elastic IP qua giao di\u1ec7n v\u00e0 API<\/li>\n<li><strong>L\u1ee3i \u00edch c\u1ed1t l\u00f5i<\/strong>: Duy tr\u00ec k\u1ebft n\u1ed1i \u1ed5n \u0111\u1ecbnh khi Stop\/Start server, h\u1ed7 tr\u1ee3 Failover (chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng) nhanh ch\u00f3ng v\u00e0 gi\u1eef uy t\u00edn IP (Reputation) cho Email Marketing.<\/li>\n<li><strong>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/strong>: Hosting Website\/Application Production, Mail Server &amp; DNS Server, Hybrid Cloud\/VPN Gateway, SFTP Server.<\/li>\n<li><strong>L\u01b0u \u00fd quan tr\u1ecdng<\/strong>: T\u00ednh linh ho\u1ea1t, c\u00f3 th\u1ec3 b\u1ecb t\u1ea5n c\u00f4ng ho\u1eb7c l\u1ea1m d\u1ee5ng, d\u1ecbch v\u1ee5 v\u00e0 \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 b\u1ecb truy c\u1eadp t\u1eeb b\u00ean ngo\u00e0i, gi\u1ea3i ph\u00f3ng \u0111\u1ec3 c\u00e1c chi ph\u00ed kh\u00f4ng c\u1ea7n thi\u1ebft.<\/li>\n<\/ul>\n<\/div>\n<p><strong>Elastic IP l\u00e0 g\u00ec<\/strong> v\u00e0 v\u00ec sao nhi\u1ec1u website ch\u1ea1y tr\u00ean cloud g\u1eb7p t\u00ecnh tr\u1ea1ng \u0111\u1ed5i IP, gi\u00e1n \u0111o\u1ea1n truy c\u1eadp sau khi restart server? B\u00e0i vi\u1ebft n\u00e0y do InterData bi\u00ean so\u1ea1n s\u1ebd gi\u1ea3i th\u00edch r\u00f5 b\u1ea3n ch\u1ea5t Elastic IP, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng, l\u1ee3i \u00edch khi s\u1eed d\u1ee5ng v\u00e0 tr\u01b0\u1eddng h\u1ee3p n\u00ean s\u1eed d\u1ee5ng, gi\u00fap ng\u01b0\u1eddi \u0111\u1ecdc l\u1ef1a ch\u1ecdn gi\u1ea3i ph\u00e1p IP ph\u00f9 h\u1ee3p cho website v\u00e0 h\u1ec7 th\u1ed1ng cloud.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Elastic-IP-la-gi\"><\/span>Elastic IP l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Elastic IP<\/strong> (EIP) l\u00e0 m\u1ed9t \u0111\u1ecba ch\u1ec9 IPv4 t\u0129nh (Static IPv4 address) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y \u0111\u1ed9ng, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng duy tr\u00ec m\u1ed9t \u0111\u1ecba ch\u1ec9 IP c\u1ed1 \u0111\u1ecbnh ngay c\u1ea3 khi t\u00e0i nguy\u00ean m\u00e1y ch\u1ee7 ph\u00eda sau thay \u0111\u1ed5i.<\/p>\n<p>Kh\u00e1c v\u1edbi \u0111\u1ecba ch\u1ec9 Public IP th\u00f4ng th\u01b0\u1eddng (\u0111\u01b0\u1ee3c c\u1ea5p ph\u00e1t t\u1eeb b\u1ec3 IP chung c\u1ee7a AWS v\u00e0 c\u00f3 t\u00ednh ch\u1ea5t t\u1ea1m th\u1eddi), Elastic IP thu\u1ed9c quy\u1ec1n s\u1edf h\u1eefu c\u1ee7a t\u00e0i kho\u1ea3n AWS cho \u0111\u1ebfn khi ng\u01b0\u1eddi d\u00f9ng ch\u1ee7 \u0111\u1ed9ng tr\u1ea3 l\u1ea1i.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38860\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-la-gi.jpg\" alt=\"Elastic IP l\u00e0 g\u00ec\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-la-gi-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-la-gi-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Elastic-IP-hoat-dong-nhu-the-nao-trong-AWS\"><\/span>Elastic IP ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o trong AWS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Elastic IP \u0111\u01b0\u1ee3c c\u1ea5p ph\u00e1t t\u1eeb <strong>d\u1ea3i \u0111\u1ecba ch\u1ec9 IP c\u00f4ng c\u1ed9ng do AWS qu\u1ea3n l\u00fd<\/strong> v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng linh ho\u1ea1t tr\u00ean nhi\u1ec1u t\u00e0i nguy\u00ean kh\u00e1c nhau. C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Elastic IP bao g\u1ed3m c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<p><strong>Ph\u00e2n b\u1ed5 Elastic IP:<\/strong><\/p>\n<p>Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t Elastic IP tr\u1ef1c ti\u1ebfp th\u00f4ng qua AWS Management Console, AWS CLI ho\u1eb7c AWS SDK, t\u00f9y theo nhu c\u1ea7u qu\u1ea3n tr\u1ecb v\u00e0 m\u1ee9c \u0111\u1ed9 t\u1ef1 \u0111\u1ed9ng h\u00f3a h\u1ec7 th\u1ed1ng.<\/p>\n<p><strong>G\u1eafn v\u00e0 th\u00e1o Elastic IP:<\/strong><\/p>\n<p>Elastic IP c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u00e1n cho m\u1ed9t instance ho\u1eb7c m\u1ed9t network interface. Trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh, b\u1ea1n ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 th\u00e1o Elastic IP kh\u1ecfi instance hi\u1ec7n t\u1ea1i v\u00e0 g\u1eafn sang instance kh\u00e1c m\u00e0 kh\u00f4ng l\u00e0m thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 IP c\u00f4ng khai.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38861\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-hoat-dong-nhu-the-nao-trong-AWS.jpg\" alt=\"Elastic IP ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o trong AWS\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-hoat-dong-nhu-the-nao-trong-AWS.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-hoat-dong-nhu-the-nao-trong-AWS-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Elastic-IP-hoat-dong-nhu-the-nao-trong-AWS-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>Chuy\u1ec3n Elastic IP gi\u1eefa c\u00e1c instance:<\/strong><\/p>\n<p>Vi\u1ec7c di chuy\u1ec3n Elastic IP gi\u1eefa c\u00e1c instance \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch th\u00e1o IP kh\u1ecfi instance \u0111ang s\u1eed d\u1ee5ng v\u00e0 g\u1eafn v\u00e0o instance m\u1edbi. Qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra nhanh ch\u00f3ng v\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 IP b\u00ean ngo\u00e0i.<\/p>\n<p><strong>Qu\u1ea3n l\u00fd Elastic IP qua giao di\u1ec7n v\u00e0 API:<\/strong><\/p>\n<p>Nh\u00e0 cung c\u1ea5p cloud cung c\u1ea5p \u0111\u1ea7y \u0111\u1ee7 c\u00f4ng c\u1ee5 qu\u1ea3n l\u00fd Elastic IP th\u00f4ng qua giao di\u1ec7n qu\u1ea3n tr\u1ecb v\u00e0 API, cho ph\u00e9p theo d\u00f5i tr\u1ea1ng th\u00e1i, g\u1eafn, th\u00e1o v\u00e0 ki\u1ec3m so\u00e1t Elastic IP trong su\u1ed1t v\u00f2ng \u0111\u1eddi s\u1eed d\u1ee5ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Phan-biet-cac-loai-IP-tren-AWS\"><\/span>Ph\u00e2n bi\u1ec7t c\u00e1c lo\u1ea1i IP tr\u00ean AWS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u th\u01b0\u1eddng nh\u1ea7m l\u1eabn gi\u1eefa ba lo\u1ea1i \u0111\u1ecba ch\u1ec9 IP ch\u00ednh tr\u00ean h\u1ec7 sinh th\u00e1i EC2. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 s\u1ef1 ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng:<\/p>\n<ul>\n<li><strong>Private IP:<\/strong> L\u00e0 \u0111\u1ecba ch\u1ec9 d\u00f9ng \u0111\u1ec3 giao ti\u1ebfp n\u1ed9i b\u1ed9 trong m\u1ea1ng Virtual Private Cloud (VPC). \u0110\u1ecba ch\u1ec9 n\u00e0y kh\u00f4ng th\u1ec3 \u0111\u1ecbnh tuy\u1ebfn tr\u1ef1c ti\u1ebfp t\u1eeb Internet v\u00e0 \u0111\u01b0\u1ee3c gi\u1eef nguy\u00ean trong su\u1ed1t v\u00f2ng \u0111\u1eddi c\u1ee7a Instance, k\u1ec3 c\u1ea3 khi b\u1ea1n Stop\/Start m\u00e1y ch\u1ee7.<\/li>\n<li><strong>Public IP (Standard\/Dynamic):<\/strong> \u0110\u01b0\u1ee3c AWS g\u00e1n t\u1ef1 \u0111\u1ed9ng khi kh\u1edfi t\u1ea1o Instance (n\u1ebfu ch\u1ecdn t\u00f9y ch\u1ecdn Auto-assign Public IP). \u0110\u1ecba ch\u1ec9 n\u00e0y gi\u1ed1ng nh\u01b0 m\u1ed9t &#8220;s\u1ed1 \u0111i\u1ec7n tho\u1ea1i t\u1ea1m th\u1eddi&#8221;. N\u1ebfu b\u1ea1n t\u1eaft m\u00e1y (Stop) ho\u1eb7c ch\u1ea5m d\u1ee9t m\u00e1y (Terminate), AWS s\u1ebd thu h\u1ed3i \u0111\u1ecba ch\u1ec9 n\u00e0y v\u1ec1 b\u1ec3 chung v\u00e0 c\u1ea5p cho ng\u01b0\u1eddi kh\u00e1c. Khi b\u1eadt m\u00e1y l\u1ea1i, b\u1ea1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 m\u1edbi.<\/li>\n<li><strong>Elastic IP:<\/strong> L\u00e0 \u0111\u1ecba ch\u1ec9 Public nh\u01b0ng c\u00f3 \u0111\u1eb7c t\u00ednh &#8220;t\u0129nh&#8221;. N\u00f3 ho\u1ea1t \u0111\u1ed9ng gi\u1ed1ng nh\u01b0 m\u1ed9t s\u1ed1 hotline c\u1ed1 \u0111\u1ecbnh doanh nghi\u1ec7p. D\u00f9 b\u1ea1n chuy\u1ec3n v\u0103n ph\u00f2ng (\u0111\u1ed5i server) hay thay \u0111\u1ed5i t\u1ed5ng \u0111\u00e0i (\u0111\u1ed5i c\u1ea5u h\u00ecnh), kh\u00e1ch h\u00e0ng v\u1eabn ch\u1ec9 c\u1ea7n g\u1ecdi v\u00e0o m\u1ed9t s\u1ed1 duy nh\u1ea5t \u0111\u00f3.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tai-sao-can-su-dung-Elastic-IP\"><\/span>T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng Elastic IP?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i t\u1eeb c\u01a1 ch\u1ebf IP \u0111\u1ed9ng sang Elastic IP mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch thi\u1ebft th\u1ef1c cho vi\u1ec7c v\u1eadn h\u00e0nh h\u1ec7 th\u1ed1ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng Production. InterData t\u1ed5ng h\u1ee3p b\u1ed1n l\u00fd do ch\u00ednh khi\u1ebfn d\u1ecbch v\u1ee5 n\u00e0y tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1-Khac-phuc-su-thay-doi-IP-khi-StopStart-Instance\"><\/span>1. Kh\u1eafc ph\u1ee5c s\u1ef1 thay \u0111\u1ed5i IP khi Stop\/Start Instance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 &#8220;n\u1ed7i \u0111au&#8221; l\u1edbn nh\u1ea5t m\u00e0 Elastic IP gi\u1ea3i quy\u1ebft. Trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh, qu\u1ea3n tr\u1ecb vi\u00ean th\u01b0\u1eddng xuy\u00ean ph\u1ea3i Stop server \u0111\u1ec3 thay \u0111\u1ed5i lo\u1ea1i Instance (Resize), g\u1eafn th\u00eam \u1ed5 c\u1ee9ng EBS, ho\u1eb7c \u0111\u1ec3 ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0o gi\u1edd th\u1ea5p \u0111i\u1ec3m.<\/p>\n<p>N\u1ebfu s\u1eed d\u1ee5ng Public IP th\u01b0\u1eddng, m\u1ed7i l\u1ea7n Start l\u1ea1i l\u00e0 m\u1ed9t l\u1ea7n IP thay \u0111\u1ed5i. B\u1ea1n s\u1ebd ph\u1ea3i c\u1eadp nh\u1eadt l\u1ea1i DNS record, s\u1eeda file c\u1ea5u h\u00ecnh \u1ee9ng d\u1ee5ng, v\u00e0 th\u00f4ng b\u00e1o IP m\u1edbi cho c\u1ea3 \u0111\u1ed9i ng\u0169 ph\u00e1t tri\u1ec3n. Elastic IP lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n quy tr\u00ecnh th\u1ee7 c\u00f4ng n\u00e0y b\u1eb1ng c\u00e1ch gi\u1eef nguy\u00ean \u0111\u1ecba ch\u1ec9 IP b\u1ea5t ch\u1ea5p tr\u1ea1ng th\u00e1i c\u1ee7a m\u00e1y ch\u1ee7.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2-High-Availability-Tinh-san-sang-cao-va-Failover\"><\/span>2. High Availability (T\u00ednh s\u1eb5n s\u00e0ng cao) v\u00e0 Failover<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Trong ki\u1ebfn tr\u00fac ch\u1ecbu l\u1ed7i (Fault-tolerant), th\u1eddi gian gi\u00e1n \u0111o\u1ea1n (Downtime) c\u1ea7n \u0111\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u t\u1ed1i \u0111a. Khi m\u00e1y ch\u1ee7 ch\u00ednh (Primary) g\u1eb7p s\u1ef1 c\u1ed1 ph\u1ea7n c\u1ee9ng ho\u1eb7c l\u1ed7i h\u1ec7 \u0111i\u1ec1u h\u00e0nh:<\/p>\n<ul>\n<li>N\u1ebfu d\u00f9ng DNS \u0111\u1ec3 tr\u1ecf sang m\u00e1y d\u1ef1 ph\u00f2ng (Secondary), b\u1ea1n ph\u1ea3i ch\u1edd th\u1eddi gian lan truy\u1ec1n DNS (TTL propagation) c\u00f3 th\u1ec3 m\u1ea5t t\u1eeb v\u00e0i ph\u00fat \u0111\u1ebfn v\u00e0i gi\u1edd.<\/li>\n<li>N\u1ebfu d\u00f9ng Elastic IP, b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n &#8220;IP Remapping&#8221; &#8211; chuy\u1ec3n IP t\u1eeb m\u00e1y l\u1ed7i sang m\u00e1y d\u1ef1 ph\u00f2ng th\u00f4ng qua API ho\u1eb7c Console ch\u1ec9 trong v\u00e0i gi\u00e2y. \u1ee8ng d\u1ee5ng kh\u00e1ch (Client) s\u1ebd g\u1ea7n nh\u01b0 kh\u00f4ng nh\u1eadn ra s\u1ef1 gi\u00e1n \u0111o\u1ea1n k\u1ebft n\u1ed1i.<\/li>\n<\/ul>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38862\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tai-sao-can-su-dung-Elastic-IP.jpg\" alt=\"T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng Elastic IP\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tai-sao-can-su-dung-Elastic-IP.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tai-sao-can-su-dung-Elastic-IP-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Tai-sao-can-su-dung-Elastic-IP-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"3-Whitelist-Firewall-Cau-hinh-tuong-lua-doi-tac\"><\/span>3. Whitelist Firewall (C\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda \u0111\u1ed1i t\u00e1c)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nhi\u1ec1u doanh nghi\u1ec7p thi\u1ebft l\u1eadp c\u00e1c k\u1ebft n\u1ed1i b\u1ea3o m\u1eadt v\u1edbi \u0111\u1ed1i t\u00e1c (B2B) \u0111\u1ec3 trao \u0111\u1ed5i d\u1eef li\u1ec7u qua API ho\u1eb7c truy c\u1eadp c\u01a1 s\u1edf d\u1eef li\u1ec7u. \u0110\u1ed1i t\u00e1c th\u01b0\u1eddng y\u00eau c\u1ea7u b\u1ea1n cung c\u1ea5p m\u1ed9t \u0111\u1ecba ch\u1ec9 IP c\u1ed1 \u0111\u1ecbnh \u0111\u1ec3 h\u1ecd th\u00eam v\u00e0o danh s\u00e1ch cho ph\u00e9p (Whitelist) tr\u00ean t\u01b0\u1eddng l\u1eeda c\u1ee7a h\u1ecd.<\/p>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng IP \u0111\u1ed9ng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y l\u00e0 b\u1ea5t kh\u1ea3 thi, v\u00ec b\u1ea1n kh\u00f4ng th\u1ec3 y\u00eau c\u1ea7u \u0111\u1ed1i t\u00e1c c\u1eadp nh\u1eadt firewall m\u1ed7i ng\u00e0y. Elastic IP cung c\u1ea5p m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t v\u00e0 tin c\u1eady \u0111\u1ec3 thi\u1ebft l\u1eadp c\u00e1c \u0111\u01b0\u1eddng truy\u1ec1n b\u1ea3o m\u1eadt n\u00e0y l\u00e2u d\u00e0i.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4-SEO-Email-Marketing-IP-Reputation\"><\/span>4. SEO &amp; Email Marketing (IP Reputation)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00e1c b\u1ed9 m\u00e1y t\u00ecm ki\u1ebfm v\u00e0 h\u1ec7 th\u1ed1ng l\u1ecdc th\u01b0 r\u00e1c (Spam filter) th\u01b0\u1eddng \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 uy t\u00edn c\u1ee7a \u0111\u1ecba ch\u1ec9 IP g\u1eedi \u0111i.<\/p>\n<ul>\n<li><strong>Email Marketing:<\/strong> N\u1ebfu b\u1ea1n t\u1ef1 v\u1eadn h\u00e0nh Mail Server, vi\u1ec7c IP thay \u0111\u1ed5i li\u00ean t\u1ee5c s\u1ebd khi\u1ebfn c\u00e1c t\u1ed5 ch\u1ee9c nh\u01b0 Spamhaus nghi ng\u1edd v\u00e0 ch\u1eb7n email. Elastic IP cho ph\u00e9p b\u1ea1n x\u00e2y d\u1ef1ng &#8220;Reputation&#8221; (\u0111\u1ed9 uy t\u00edn) cho IP \u0111\u00f3 theo th\u1eddi gian, \u0111\u1ed3ng th\u1eddi h\u1ed7 tr\u1ee3 c\u1ea5u h\u00ecnh b\u1ea3n ghi rDNS (Reverse DNS) &#8211; m\u1ed9t y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c \u0111\u1ec3 g\u1eedi email v\u00e0o Inbox.<\/li>\n<li><strong>SEO:<\/strong> M\u1eb7c d\u00f9 Google x\u00e1c nh\u1eadn IP kh\u00f4ng ph\u1ea3i l\u00e0 y\u1ebfu t\u1ed1 x\u1ebfp h\u1ea1ng tr\u1ef1c ti\u1ebfp, nh\u01b0ng vi\u1ec7c \u1ed5n \u0111\u1ecbnh IP gi\u00fap Googlebot thu th\u1eadp d\u1eef li\u1ec7u (crawl) website \u1ed5n \u0111\u1ecbnh h\u01a1n, tr\u00e1nh c\u00e1c l\u1ed7i k\u1ebft n\u1ed1i kh\u00f4ng \u0111\u00e1ng c\u00f3.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"So-sanh-Public-IP-va-Elastic-IP-Comparison\"><\/span>So s\u00e1nh Public IP v\u00e0 Elastic IP (Comparison)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0110\u1ec3 gi\u00fap b\u1ea1n \u0111\u1ecdc c\u00f3 c\u00e1i nh\u00ecn tr\u1ef1c quan, b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y so s\u00e1nh chi ti\u1ebft c\u00e1c \u0111\u1eb7c t\u00ednh k\u1ef9 thu\u1eadt gi\u1eefa hai lo\u1ea1i \u0111\u1ecba ch\u1ec9 n\u00e0y:<\/p>\n<table style=\"width: 100%; border-collapse: collapse; font-family: Arial, Helvetica, sans-serif; font-size: 15px; line-height: 1.6; box-shadow: 0 4px 12px rgba(0,0,0,0.08);\">\n<thead>\n<tr style=\"background: linear-gradient(90deg,#0C40F4,#077FFA,#0497FC); color: #ffffff;\">\n<th style=\"padding: 14px; border: 1px solid #e5e7eb; text-align: left;\">Ti\u00eau ch\u00ed<\/th>\n<th style=\"padding: 14px; border: 1px solid #e5e7eb; text-align: left;\">Public IP (M\u1eb7c \u0111\u1ecbnh)<\/th>\n<th style=\"padding: 14px; border: 1px solid #e5e7eb; text-align: left;\">Elastic IP (EIP)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: 600;\">T\u00ednh c\u1ed1 \u0111\u1ecbnh<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">Kh\u00f4ng. Thay \u0111\u1ed5i m\u1ed7i khi Stop\/Start Instance.<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">C\u00f3. C\u1ed1 \u0111\u1ecbnh trong su\u1ed1t th\u1eddi gian ng\u01b0\u1eddi d\u00f9ng gi\u1eef EIP.<\/td>\n<\/tr>\n<tr style=\"background-color: #f8faff;\">\n<td style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: 600;\">Quy\u1ec1n s\u1edf h\u1eefu<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">T\u1ea1m th\u1eddi. AWS s\u1edf h\u1eefu v\u00e0 thu h\u1ed3i khi kh\u00f4ng d\u00f9ng.<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">L\u00e2u d\u00e0i. G\u1eafn v\u1edbi t\u00e0i kho\u1ea3n ng\u01b0\u1eddi d\u00f9ng AWS.<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: 600;\">Ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">G\u1eafn ch\u1eb7t v\u1edbi Instance c\u1ee5 th\u1ec3.<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">Linh ho\u1ea1t. C\u00f3 th\u1ec3 th\u00e1o\/l\u1eafp gi\u1eefa c\u00e1c Instance trong c\u00f9ng Region.<\/td>\n<\/tr>\n<tr style=\"background-color: #f8faff;\">\n<td style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: 600;\">Chi ph\u00ed<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">T\u00ednh ph\u00ed theo gi\u1edd s\u1eed d\u1ee5ng IPv4 (theo ch\u00ednh s\u00e1ch m\u1edbi).<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">T\u00ednh ph\u00ed theo gi\u1edd IPv4 + Ph\u00ed ph\u1ea1t n\u1ebfu kh\u1edfi t\u1ea1o m\u00e0 kh\u00f4ng s\u1eed d\u1ee5ng.<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: 600;\">Ph\u1ee5c h\u1ed3i<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">Kh\u00f4ng th\u1ec3 ph\u1ee5c h\u1ed3i sau khi m\u1ea5t.<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">C\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i n\u1ebfu v\u1eeba l\u1ee1 tay x\u00f3a (trong th\u1eddi gian ng\u1eafn &#8211; ph\u1ee5c h\u1ed3i kh\u00f4ng \u0111\u1ea3m b\u1ea3o, ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c IP ch\u01b0a \u0111\u01b0\u1ee3c c\u1ea5p l\u1ea1i cho ng\u01b0\u1eddi kh\u00e1c).<\/td>\n<\/tr>\n<tr style=\"background-color: #f8faff;\">\n<td style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: 600;\">Use Case<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">M\u00f4i tr\u01b0\u1eddng Dev\/Test ng\u1eafn h\u1ea1n, kh\u00f4ng quan tr\u1ecdng IP.<\/td>\n<td style=\"padding: 12px; border: 1px solid #e5e7eb;\">Web Server, Mail Server, Load Balancer th\u1ee7 c\u00f4ng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>L\u01b0u \u00fd:<\/strong> Tr\u01b0\u1edbc \u0111\u00e2y, Public IP th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 mi\u1ec5n ph\u00ed. Tuy nhi\u00ean, t\u1eeb ng\u00e0y 1\/2\/2024, AWS \u0111\u00e3 \u00e1p d\u1ee5ng ch\u00ednh s\u00e1ch t\u00ednh ph\u00ed cho to\u00e0n b\u1ed9 \u0111\u1ecba ch\u1ec9 IPv4 c\u00f4ng khai (bao g\u1ed3m c\u1ea3 Public IP v\u00e0 Elastic IP) nh\u1eb1m ph\u1ea3n \u00e1nh s\u1ef1 khan hi\u1ebfm c\u1ee7a t\u00e0i nguy\u00ean n\u00e0y.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Khi-nao-nen-va-khong-nen-dung-Elastic-IP\"><\/span>Khi n\u00e0o n\u00ean v\u00e0 kh\u00f4ng n\u00ean d\u00f9ng Elastic IP?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u1ef1a tr\u00ean kinh nghi\u1ec7m tri\u1ec3n khai th\u1ef1c t\u1ebf, InterData \u0111\u1ec1 xu\u1ea5t c\u00e1c t\u00ecnh hu\u1ed1ng s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 gi\u00fap b\u1ea1n ra quy\u1ebft \u0111\u1ecbnh ch\u00ednh x\u00e1c:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Truong-hop-NEN-dung-Recommended\"><\/span>Tr\u01b0\u1eddng h\u1ee3p N\u00caN d\u00f9ng (Recommended)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Hosting Website\/Application Production:<\/strong> B\u1ea5t k\u1ef3 website n\u00e0o ho\u1ea1t \u0111\u1ed9ng ch\u00ednh th\u1ee9c \u0111\u1ec1u c\u1ea7n IP t\u0129nh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ng\u01b0\u1eddi d\u00f9ng v\u00e0 bot t\u00ecm ki\u1ebfm truy c\u1eadp \u1ed5n \u0111\u1ecbnh.<\/li>\n<li><strong>Mail Server &amp; DNS Server:<\/strong> C\u00e1c m\u00e1y ch\u1ee7 n\u00e0y y\u00eau c\u1ea7u t\u00ednh \u0111\u1ecbnh danh cao v\u00e0 \u00edt thay \u0111\u1ed5i.<\/li>\n<li><strong>SFTP Server:<\/strong> \u0110\u1ed1i t\u00e1c g\u1eedi file c\u1ea7n IP c\u1ed1 \u0111\u1ecbnh \u0111\u1ec3 k\u1ebft n\u1ed1i.<\/li>\n<li><strong>Hybrid Cloud\/VPN Gateway:<\/strong> Khi thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i VPN Site-to-Site gi\u1eefa v\u0103n ph\u00f2ng c\u00f4ng ty v\u00e0 AWS, thi\u1ebft b\u1ecb Router \u1edf v\u0103n ph\u00f2ng c\u1ea7n m\u1ed9t \u0111\u1ecba ch\u1ec9 \u0111\u00edch c\u1ed1 \u0111\u1ecbnh tr\u00ean AWS \u0111\u1ec3 k\u1ebft n\u1ed1i t\u1edbi.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Truong-hop-KHONG-NEN-dung-Not-Recommended\"><\/span>Tr\u01b0\u1eddng h\u1ee3p KH\u00d4NG N\u00caN d\u00f9ng (Not Recommended)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>H\u1ec7 th\u1ed1ng Auto Scaling:<\/strong> Khi s\u1eed d\u1ee5ng Auto Scaling Group (ASG), c\u00e1c m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c sinh ra v\u00e0 m\u1ea5t \u0111i li\u00ean t\u1ee5c theo t\u1ea3i ng\u01b0\u1eddi d\u00f9ng. Vi\u1ec7c g\u00e1n EIP cho t\u1eebng m\u00e1y l\u00e0 kh\u00f4ng kh\u1ea3 thi v\u00e0 \u0111i ng\u01b0\u1ee3c l\u1ea1i tri\u1ebft l\u00fd thi\u1ebft k\u1ebf &#8220;Cattle not Pets&#8221; (Coi m\u00e1y ch\u1ee7 l\u00e0 gia s\u00fac thay v\u00ec th\u00fa c\u01b0ng). Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, h\u00e3y s\u1eed d\u1ee5ng <strong>Load Balancer (ALB\/NLB)<\/strong> l\u00e0m \u0111i\u1ec3m truy c\u1eadp duy nh\u1ea5t.<\/li>\n<li><strong>M\u00f4i tr\u01b0\u1eddng Dev\/Test ng\u1eafn h\u1ea1n:<\/strong> N\u1ebfu developer ch\u1ec9 c\u1ea7n d\u1ef1ng m\u00e1y l\u00ean test code trong 2 ti\u1ebfng r\u1ed3i x\u00f3a, vi\u1ec7c c\u1ea5p ph\u00e1t EIP l\u00e0 l\u00e3ng ph\u00ed th\u1eddi gian c\u1ea5u h\u00ecnh v\u00e0 r\u1ee7i ro qu\u00ean release g\u00e2y t\u1ed1n ph\u00ed.<\/li>\n<li><strong>C\u1ee5m Cluster n\u1ed9i b\u1ed9:<\/strong> C\u00e1c node trong c\u1ee5m Kubernetes ho\u1eb7c Database Cluster giao ti\u1ebfp v\u1edbi nhau qua Private IP, kh\u00f4ng c\u1ea7n thi\u1ebft ph\u1ea3i g\u1eafn Elastic IP cho t\u1eebng node.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Nhung-luu-y-quan-trong-khi-su-dung-Elastic-IP\"><\/span>Nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng Elastic IP<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u00f9 mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch trong m\u00f4i tr\u01b0\u1eddng cloud, Elastic IP v\u1eabn c\u00f3 m\u1ed9t s\u1ed1 \u0111i\u1ec3m c\u1ea7n \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc k\u1ef9 trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng:<\/p>\n<p><strong>T\u00ednh linh ho\u1ea1t:<\/strong><\/p>\n<p>Elastic IP cho ph\u00e9p chuy\u1ec3n \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 IP nhanh ch\u00f3ng gi\u1eefa c\u00e1c instance kh\u00e1c nhau. Tuy nhi\u00ean, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 v\u1eadn h\u00e0nh, b\u1ea1n n\u00ean x\u00e2y d\u1ef1ng quy tr\u00ecnh t\u1ef1 \u0111\u1ed9ng ho\u1eb7c b\u00e1n t\u1ef1 \u0111\u1ed9ng nh\u1eb1m ki\u1ec3m so\u00e1t vi\u1ec7c g\u1eafn v\u00e0 th\u00e1o IP m\u1ed9t c\u00e1ch nh\u1ea5t qu\u00e1n.<\/p>\n<p><strong>B\u1ea3o m\u1eadt:<\/strong><\/p>\n<p>N\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd ch\u1eb7t ch\u1ebd, Elastic IP c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh m\u1ee5c ti\u00eau t\u1ea5n c\u00f4ng ho\u1eb7c b\u1ecb s\u1eed d\u1ee5ng sai m\u1ee5c \u0111\u00edch. Ch\u1ec9 n\u00ean g\u00e1n Elastic IP cho nh\u1eefng instance th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft v\u00e0 \u00e1p d\u1ee5ng c\u00e1c ch\u00ednh s\u00e1ch b\u1ea3o m\u1eadt ph\u00f9 h\u1ee3p \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c t\u00e0i nguy\u00ean li\u00ean quan.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-38864\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Luu-y-quan-trong-khi-su-dung-Elastic-IP.jpg\" alt=\"L\u01b0u \u00fd quan tr\u1ecdng khi s\u1eed d\u1ee5ng Elastic IP\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Luu-y-quan-trong-khi-su-dung-Elastic-IP.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Luu-y-quan-trong-khi-su-dung-Elastic-IP-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2026\/01\/Luu-y-quan-trong-khi-su-dung-Elastic-IP-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>\u0110\u1eb7c t\u00ednh IP c\u00f4ng c\u1ed9ng:<\/strong><\/p>\n<p>Elastic IP l\u00e0 \u0111\u1ecba ch\u1ec9 IP c\u00f4ng c\u1ed9ng c\u00f3 th\u1ec3 truy c\u1eadp tr\u1ef1c ti\u1ebfp t\u1eeb Internet. \u0110i\u1ec1u n\u00e0y \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c m\u1ecdi d\u1ecbch v\u1ee5 ho\u1eb7c \u1ee9ng d\u1ee5ng s\u1eed d\u1ee5ng Elastic IP \u0111\u1ec1u c\u00f3 kh\u1ea3 n\u0103ng b\u1ecb truy c\u1eadp t\u1eeb b\u00ean ngo\u00e0i. V\u00ec v\u1eady, c\u1ea7n c\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt b\u1ed5 sung \u0111\u1ec3 h\u1ea1n ch\u1ebf r\u1ee7i ro t\u1ea5n c\u00f4ng m\u1ea1ng.<\/p>\n<p><strong>Gi\u1ea3i ph\u00f3ng Elastic IP khi kh\u00f4ng c\u00f2n s\u1eed d\u1ee5ng:<\/strong><\/p>\n<p>Trong tr\u01b0\u1eddng h\u1ee3p Elastic IP kh\u00f4ng c\u00f2n c\u1ea7n thi\u1ebft, b\u1ea1n n\u00ean gi\u1ea3i ph\u00f3ng IP \u0111\u1ec3 tr\u00e1nh ph\u00e1t sinh chi ph\u00ed kh\u00f4ng c\u1ea7n thi\u1ebft. Tr\u01b0\u1edbc khi gi\u1ea3i ph\u00f3ng ho\u00e0n to\u00e0n, Elastic IP c\u1ea7n \u0111\u01b0\u1ee3c t\u00e1ch kh\u1ecfi instance \u0111ang li\u00ean k\u1ebft.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-cau-hoi-thuong-gap-FAQs\"><\/span>C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQs)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 gi\u1ea3i \u0111\u00e1p cho nh\u1eefng th\u1eafc m\u1eafc k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn m\u00e0 ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng g\u1eb7p khi l\u00e0m vi\u1ec7c v\u1edbi Elastic IP.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1-Elastic-IP-co-lam-thay-doi-Private-IP-cua-instance-khong\"><\/span>1. Elastic IP c\u00f3 l\u00e0m thay \u0111\u1ed5i Private IP c\u1ee7a instance kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Tr\u1ea3 l\u1eddi:<\/strong> Kh\u00f4ng. Vi\u1ec7c g\u00e1n Elastic IP ch\u1ec9 thay th\u1ebf \u0111\u1ecba ch\u1ec9 Public IP b\u00ean ngo\u00e0i. \u0110\u1ecba ch\u1ec9 Private IP c\u1ee7a instance (v\u00ed d\u1ee5: 172.31.x.x) v\u1eabn gi\u1eef nguy\u00ean. C\u00e1c c\u1ea5u h\u00ecnh \u1ee9ng d\u1ee5ng tr\u1ecf v\u1ec1 localhost ho\u1eb7c Private IP s\u1ebd kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2-Toi-co-the-phuc-hoi-Elastic-IP-da-lo-tay-Release-khong\"><\/span>2. T\u00f4i c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i Elastic IP \u0111\u00e3 l\u1ee1 tay Release kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Tr\u1ea3 l\u1eddi:<\/strong> C\u00f3 th\u1ec3, nh\u01b0ng kh\u00f4ng \u0111\u1ea3m b\u1ea3o 100%. AWS cung c\u1ea5p t\u00ednh n\u0103ng &#8220;Recover Elastic IP&#8221;. N\u1ebfu b\u1ea1n v\u1eeba release IP v\u00e0 ch\u01b0a c\u00f3 ai kh\u00e1c l\u1ea5y m\u1ea5t \u0111\u1ecba ch\u1ec9 \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 kh\u00f4i ph\u1ee5c l\u1ea1i. Tuy nhi\u00ean, do l\u01b0\u1ee3ng ng\u01b0\u1eddi d\u00f9ng AWS r\u1ea5t l\u1edbn, kh\u1ea3 n\u0103ng m\u1ea5t v\u0129nh vi\u1ec5n \u0111\u1ecba ch\u1ec9 \u0111\u00f3 l\u00e0 kh\u00e1 cao n\u1ebfu b\u1ea1n \u0111\u1ec3 qu\u00e1 l\u00e2u.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3-Tai-sao-toi-khong-ket-noi-duoc-SSH-sau-khi-gan-Elastic-IP\"><\/span>3. T\u1ea1i sao t\u00f4i kh\u00f4ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c SSH sau khi g\u00e1n Elastic IP?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Tr\u1ea3 l\u1eddi:<\/strong> Nguy\u00ean nh\u00e2n th\u01b0\u1eddng g\u1eb7p nh\u1ea5t l\u00e0 do c\u1ea5u h\u00ecnh Security Group. N\u1ebfu Security Group c\u1ee7a b\u1ea1n gi\u1edbi h\u1ea1n SSH (port 22) ch\u1ec9 t\u1eeb m\u1ed9t IP c\u1ee5 th\u1ec3 n\u00e0o \u0111\u00f3, vi\u1ec7c thay \u0111\u1ed5i IP \u0111\u00edch (t\u1eeb Public IP c\u0169 sang EIP m\u1edbi) kh\u00f4ng \u1ea3nh h\u01b0\u1edfng.<\/p>\n<p>Tuy nhi\u00ean, SSH Client tr\u00ean m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 l\u01b0u cache &#8220;fingerprint&#8221; c\u1ee7a server c\u0169. Khi IP thay \u0111\u1ed5i (ho\u1eb7c khi d\u00f9ng IP m\u1edbi), client c\u00f3 th\u1ec3 c\u1ea3nh b\u00e1o b\u1ea3o m\u1eadt. H\u00e3y ki\u1ec3m tra l\u1ea1i file known_hosts tr\u00ean m\u00e1y t\u00ednh c\u00e1 nh\u00e2n. Ngo\u00e0i ra, \u0111\u1ea3m b\u1ea3o Route Table c\u1ee7a Subnet \u0111\u00e3 tr\u1ecf 0.0.0.0\/0 ra Internet Gateway.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4-Dung-Elastic-IP-co-anh-huong-den-toc-do-mang-khong\"><\/span>4. D\u00f9ng Elastic IP c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 m\u1ea1ng kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Tr\u1ea3 l\u1eddi:<\/strong> Kh\u00f4ng. Elastic IP ho\u1ea1t \u0111\u1ed9ng \u1edf l\u1edbp bi\u00ean m\u1ea1ng v\u00e0 s\u1eed d\u1ee5ng c\u00f9ng h\u1ea1 t\u1ea7ng Internet Gateway nh\u01b0 Public IP th\u01b0\u1eddng. Kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 b\u0103ng th\u00f4ng (throughput) hay \u0111\u1ed9 tr\u1ec5 (latency) gi\u1eefa hai lo\u1ea1i IP n\u00e0y.<\/p>\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>Elastic IP l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n nh\u01b0ng c\u1ef1c k\u1ef3 quan tr\u1ecdng trong h\u1ec7 sinh th\u00e1i AWS. Vi\u1ec7c hi\u1ec3u \u0111\u00fang <strong>Elastic IP l\u00e0 g\u00ec<\/strong> gi\u00fap b\u1ea1n kh\u00f4ng ch\u1ec9 duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh cho h\u1ec7 th\u1ed1ng m\u00e0 c\u00f2n ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c b\u00e0i to\u00e1n chi ph\u00ed h\u1ea1 t\u1ea7ng.<\/p>\n<p>T\u00f3m l\u1ea1i, Elastic IP l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1eafc l\u1ef1c cho c\u00e1c h\u1ec7 th\u1ed1ng Production c\u1ea7n \u0111\u1ecbnh danh c\u1ed1 \u0111\u1ecbnh. Tuy nhi\u00ean, t\u00e0i nguy\u00ean IPv4 \u0111ang ng\u00e0y c\u00e0ng khan hi\u1ebfm v\u00e0 \u0111\u1eaft \u0111\u1ecf. L\u1eddi khuy\u00ean t\u1eeb InterData l\u00e0 h\u00e3y s\u1eed d\u1ee5ng Elastic IP m\u1ed9t c\u00e1ch c\u00f3 chi\u1ebfn l\u01b0\u1ee3c: ch\u1ec9 c\u1ea5p ph\u00e1t khi th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft, t\u1eadn d\u1ee5ng Load Balancer cho c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn, v\u00e0 lu\u00f4n nh\u1edb quy t\u1eafc v\u00e0ng &#8220;Release khi kh\u00f4ng s\u1eed d\u1ee5ng&#8221; \u0111\u1ec3 tr\u00e1nh l\u00e3ng ph\u00ed.<\/p>\n<p>Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y <strong><a href=\"https:\/\/interdata.vn\/\">InterData<\/a> <\/strong>\u0111\u00e3 cung c\u1ea5p cho b\u1ea1n nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u1ea7y \u0111\u1ee7 v\u00e0 th\u1ef1c t\u1ebf nh\u1ea5t. N\u1ebfu b\u1ea1n c\u1ea7n t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c d\u1ecbch v\u1ee5 m\u1ea1ng n\u00e2ng cao nh\u01b0 VPC, Route53 hay gi\u1ea3i ph\u00e1p t\u1ed1i \u01b0u h\u00f3a AWS, h\u00e3y ti\u1ebfp t\u1ee5c theo d\u00f5i c\u00e1c b\u00e0i vi\u1ebft chuy\u00ean s\u00e2u kh\u00e1c t\u1eeb InterData.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u00f3m t\u1eaft n\u1ed9i dung: Elastic IP (EIP) l\u00e0 gi\u1ea3i ph\u00e1p \u0111\u1ecba ch\u1ec9 IPv4 t\u0129nh \u0111\u01b0\u1ee3c Amazon Web Services (AWS) cung c\u1ea5p \u0111\u1ec3 kh\u1eafc ph\u1ee5c nh\u01b0\u1ee3c \u0111i\u1ec3m thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 m\u1ea1ng m\u1ed7i khi kh\u1edfi \u0111\u1ed9ng l\u1ea1i m\u00e1y ch\u1ee7 \u1ea3o (EC2). Th\u00f4ng tin tr\u1ecdng t\u00e2m: Elastic IP Address (EIP): M\u1ed9t \u0111\u1ecba ch\u1ec9 IPv4 c\u00f4ng khai, t\u0129nh<\/p>\n","protected":false},"author":11,"featured_media":38863,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[151],"tags":[],"class_list":["post-38847","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mang"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/38847","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\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=38847"}],"version-history":[{"count":12,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/38847\/revisions"}],"predecessor-version":[{"id":38870,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/38847\/revisions\/38870"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/38863"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=38847"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=38847"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=38847"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}