{"id":2887,"date":"2026-02-06T16:10:00","date_gmt":"2026-02-06T08:10:00","guid":{"rendered":"https:\/\/ichwanchandra.com\/blog\/?p=2887"},"modified":"2026-08-27T14:45:10","modified_gmt":"2026-08-27T06:45:10","slug":"aws-solutions-architect-project-reliability-pillar-part-5","status":"publish","type":"post","link":"https:\/\/ichwanchandra.com\/blog\/aws-solutions-architect-project-reliability-pillar-part-5\/","title":{"rendered":"AWS Solutions Architect Project (Reliability Pillar) \u2013 High Availability Design \u2013 Part 5"},"content":{"rendered":"\n<p>Our highly available and fault-tolerant web application infrastructure so far needs some final validation to ensure it works as expected. Now we&#8217;ll simulate failure cases, check recover behavior, and confirm if DNS has failed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Access Validation to The Application<\/h2>\n\n\n\n<p>With the new launch template, let&#8217;s re-run the new auto scaling group to ensure the same landing page is accessible via our ALB. Ensure we can access the application properly via the ALB.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1080\" height=\"1492\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/08\/image.png\" alt=\"\" class=\"wp-image-2894\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/08\/image.png 1080w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/08\/image-217x300.png 217w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/08\/image-741x1024.png 741w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/08\/image-768x1061.png 768w\" sizes=\"auto, (max-width: 1080px) 100vw, 1080px\" \/><\/figure>\n\n\n\n<p>In case there is any issue in accessing the application, please check the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check your <strong>Target Group health<\/strong> <\/li>\n\n\n\n<li>Ensure EC2 instances are running and in service <\/li>\n\n\n\n<li>Confirm your <strong>security group<\/strong> allows HTTP (port 80)<\/li>\n<\/ul>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: <strong>Simulate EC2 Instance Failure<\/strong><\/h2>\n\n\n\n<p>Next, we will test the auto scaling group ability by stopping \/ terminating one of the EC2 instance within ASG.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Go to <strong>EC2 \u2192 Instances<\/strong> <\/li>\n\n\n\n<li>Select one instance in the Auto Scaling Group <\/li>\n\n\n\n<li>Click <strong>Instance state \u2192 Stop instance<\/strong><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"156\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-57-1024x156.png\" alt=\"\" class=\"wp-image-2902\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-57-1024x156.png 1024w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-57-300x46.png 300w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-57-768x117.png 768w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-57-1536x234.png 1536w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-57.png 1909w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Within several minutes, ASG will initialize a new instance to replace the stopped instance<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"156\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-58-1024x156.png\" alt=\"\" class=\"wp-image-2903\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-58-1024x156.png 1024w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-58-300x46.png 300w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-58-768x117.png 768w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-58-1536x234.png 1536w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-58.png 1909w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>With below final result where it shows how ASG handle the failure within to ensure the application keep running.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"156\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-59-1024x156.png\" alt=\"\" class=\"wp-image-2904\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-59-1024x156.png 1024w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-59-300x46.png 300w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-59-768x117.png 768w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-59-1536x234.png 1536w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-59.png 1909w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Simulate ALB Failure, Observe DNS Failover<\/h2>\n\n\n\n<p>Here we are testing whether the Route 53 fails and it will detect via its health checking.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Go to <strong>EC2 \u2192 Auto Scaling Groups<\/strong> <\/li>\n\n\n\n<li>Set <strong>desired, min desired and max desired capacity = 0<\/strong> (this removes all EC2 instances)<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"497\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-60.png\" alt=\"\" class=\"wp-image-2907\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-60.png 600w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-60-300x249.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"832\" height=\"278\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-61.png\" alt=\"\" class=\"wp-image-2908\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-61.png 832w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-61-300x100.png 300w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-61-768x257.png 768w\" sizes=\"auto, (max-width: 832px) 100vw, 832px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>After around 5 minutes, the ALB health check Route 53 will show unhealthy<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1069\" height=\"963\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-62.png\" alt=\"\" class=\"wp-image-2909\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-62.png 1069w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-62-300x270.png 300w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-62-1024x922.png 1024w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-62-768x692.png 768w\" sizes=\"auto, (max-width: 1069px) 100vw, 1069px\" \/><\/figure>\n\n\n\n<p>Then if we access our domain \/ ALB public DNS we should be redirected to the static failover site on S3 bucket as per discussed on the part 3.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"697\" height=\"278\" src=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-63.png\" alt=\"\" class=\"wp-image-2916\" srcset=\"https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-63.png 697w, https:\/\/ichwanchandra.com\/blog\/wp-content\/uploads\/2026\/02\/image-63-300x120.png 300w\" sizes=\"auto, (max-width: 697px) 100vw, 697px\" \/><\/figure>\n\n\n\n<p>Once tested, we can reset back the ASG instance to the desired values.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p>In this project we have demonstrated the AWS reliability principles such as<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Redundancy<\/strong><br>Across AZs for all critical components like EC2 instance and EFS<br><\/li>\n\n\n\n<li><strong>Monitoring<\/strong><br>Continuous and layered health checks and alert such as at DNS level (Route 53) and compute level (load balancer)<br><\/li>\n\n\n\n<li><strong>Self-healing<\/strong><br>Adaptability for the service to handle the failure such as Auto Scaling Group and DNS failover (Route 53)<br><\/li>\n\n\n\n<li><strong>Isolation<\/strong><br>Layered design that give clarity in term of boundary and responsibility<\/li>\n<\/ul>\n\n\n\n<p>In more mission-critical services for production realm, we also can consider the following principles<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Automated backups and snapshots<\/strong><br>Using AWS backup to automate and schedule RDS snapshots and configure EFS backup to ensure the durability as part of disaster recovery<br><\/li>\n\n\n\n<li><strong>Cross-Region Failover<\/strong><br>Using Route 53 to do the health check on the region level and automatically deploy application in another region in order to avoid regional outage<br><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Our highly available and fault-tolerant web application infrastructure so far needs some final validation to ensure it works as expected. Now we&#8217;ll simulate failure cases, check recover behavior, and confirm if DNS has failed.<\/p>\n","protected":false},"author":1,"featured_media":2918,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,10,75,8],"tags":[],"class_list":["post-2887","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backend","category-cloud","category-system-design","category-technology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AWS Solutions Architect Project (Reliability Pillar) \u2013 High Availability Design \u2013 Part 5 - Ichwan Chandra<\/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:\/\/ichwanchandra.com\/blog\/aws-solutions-architect-project-reliability-pillar-part-5\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AWS Solutions Architect Project (Reliability Pillar) \u2013 High Availability Design \u2013 Part 5 - Ichwan Chandra\" \/>\n<meta property=\"og:description\" content=\"Our highly available and fault-tolerant web application infrastructure so far needs some final validation to ensure it works as expected. 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