{"id":17663,"date":"2026-06-26T13:00:00","date_gmt":"2026-06-26T19:00:00","guid":{"rendered":"https:\/\/www.supportpro.com\/blog\/?p=17663"},"modified":"2026-06-23T23:03:56","modified_gmt":"2026-06-24T05:03:56","slug":"spot-instance-automation-with-ec2-auto-scaling-and-aws-fault-injection-simulator","status":"publish","type":"post","link":"https:\/\/www.supportpro.com\/blog\/spot-instance-automation-with-ec2-auto-scaling-and-aws-fault-injection-simulator\/","title":{"rendered":"Spot instance automation with EC2 Auto Scaling and AWS Fault Injection Simulator"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Scalability, cost-effectiveness, and resilience are essential for contemporary cloud-native applications. Although up to 90% less expensive than On-Demand instances, AWS Spot Instances pose a risk to workload availability due to their transient nature. This is where resilience testing with AWS Fault Injection Simulator (FIS) and clever automation with EC2 Auto Scaling come into play.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this article, we&#8217;ll look at how to use EC2 Auto Scaling to automate Spot Instance utilization and how to use AWS FIS to test your system&#8217;s fault tolerance and replicate real-world failures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Spot Instances?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Spot Instances allow you to take advantage of unused Amazon EC2 capacity at reduced prices. However, if AWS needs the capacity back, it can be stopped with only two minutes&#8217; notice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ideal Use Cases for Spot Instances:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Batch processing jobs<br><\/li>\n\n\n\n<li>CI\/CD workloads<br><\/li>\n\n\n\n<li>Containerized workloads (e.g., Kubernetes, ECS)<br><\/li>\n\n\n\n<li>Fault-tolerant microservices<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">To effectively leverage Spot Instances in production, you need to automate their provisioning and ensure graceful fallback to On-Demand capacity during interruptions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Automating Spot Instances with EC2 Auto Scaling<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Amazon EC2 Auto Scaling<\/strong> automatically adjusts the number of instances in your application\u2019s fleet based on demand, health checks, or schedules. By configuring a mixed instance policy, you can blend Spot and On-Demand capacity to optimize cost and availability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1: Define a Launch Template<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Create an EC2 Launch Template that includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Instance type(s)<br><\/li>\n\n\n\n<li>AMI ID<br><\/li>\n\n\n\n<li>Key pair<br><\/li>\n\n\n\n<li>Security group<br><\/li>\n\n\n\n<li>User data (for bootstrapping)<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This template forms the blueprint for launching EC2 instances in your Auto Scaling Group (ASG).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: Create an Auto Scaling Group with Mixed Instances<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In your ASG configuration, select a <strong>Mixed Instances Policy<\/strong>. This allows you to set preferences like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Spot allocation strategy<\/strong>: e.g., <em>capacity-optimised<\/em> or <em>lowest-price<\/em><em><br><\/em><\/li>\n\n\n\n<li><strong>On-Demand base capacity<\/strong>: Minimum number of On-Demand instances to always have<br><\/li>\n\n\n\n<li><strong>Percentage split<\/strong>: Define how much of your fleet should be Spot vs On-Demand<br><\/li>\n\n\n\n<li><strong>Instance pools<\/strong>: Provide flexibility across multiple instance types and availability zones<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;MixedInstancesPolicy&#8221;: {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&#8220;LaunchTemplate&#8221;: {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&#8220;LaunchTemplateSpecification&#8221;: {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8220;LaunchTemplateId&#8221;: &#8220;lt-0abcd1234&#8221;,<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8220;Version&#8221;: &#8220;$Latest&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;},<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&#8220;InstancesDistribution&#8221;: {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&#8220;OnDemandPercentageAboveBaseCapacity&#8221;: 30,<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&#8220;SpotAllocationStrategy&#8221;: &#8220;capacity-optimised&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: Attach Scaling Policies<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To enable elasticity, attach:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Target tracking policies<\/strong> (e.g., CPU utilisation)<br><\/li>\n\n\n\n<li><strong>Scheduled actions<\/strong> (scale at specific times)<br><\/li>\n\n\n\n<li><strong>Step scaling policies<\/strong> (adjust based on thresholds)<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This guarantees that your Spot instances automatically scale in and out in real time in response to demand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The effectiveness of AWS Fault Injection Simulator Automation in enhancing fault tolerance depends on its stress resilience. Presenting AWS Fault Injection Simulator (FIS), a completely managed solution for conducting controlled tests using chaos engineering on workloads hosted on AWS.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Use FIS?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FIS helps answer critical questions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What happens when a Spot instance is interrupted?<br><\/li>\n\n\n\n<li>Does the Auto Scaling Group replace lost capacity?<br><\/li>\n\n\n\n<li>Is there failover to On-Demand instances?<br><\/li>\n\n\n\n<li>Are application metrics and alerts triggered correctly?<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By simulating failures, FIS ensures your automation logic behaves predictably and recovers quickly. Common Chaos Scenarios for EC2 Spot Instances:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Terminate EC2 Spot Instances<\/strong>: Simulates AWS reclaiming Spot capacity.<br><\/li>\n\n\n\n<li><strong>Simulate Network Latency or Packet Loss<\/strong>: Helps identify how dependent services handle degraded performance.<br><\/li>\n\n\n\n<li><strong>Inject CPU or memory stress<\/strong> to validate that scaling policies are triggered as expected.<br><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1: Set Up IAM Roles<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FIS requires a role with permissions to perform actions like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ec2:TerminateInstances<br><\/li>\n\n\n\n<li>autoscaling: UpdateAutoScalingGroup<br><\/li>\n\n\n\n<li>cloudwatch: GetMetricData<br><\/li>\n\n\n\n<li>Logging to CloudWatch<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Attach the FIS role to your experiment templates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: Define an Experiment Template<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An FIS experiment template contains:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Targets<\/strong>: e.g., EC2 instances in a specific Auto Scaling Group<br><\/li>\n\n\n\n<li><strong>Actions<\/strong>: e.g., terminate a Spot instance<br><\/li>\n\n\n\n<li><strong>Stop conditions<\/strong>: CloudWatch alarms that halt the experiment if thresholds are breached<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">targets:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;spotInstances:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;resourceType: aws:ec2:instance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;selectionMode: COUNT(1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;filters:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211; path: &#8220;InstanceLifecycle&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;values: [&#8220;spot&#8221;]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">actions:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;terminateSpot:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;actionId: aws:ec2:terminate-instances<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;parameters:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instanceIds: &#8220;{{spotInstances}}&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: Run Experiments and Analyse<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Execute the experiment and observe:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Auto Scaling group replaces terminated Spot instance<br><\/li>\n\n\n\n<li>Replacement respects instance type preferences<br><\/li>\n\n\n\n<li>CloudWatch alarms and logs are triggered<br><\/li>\n\n\n\n<li>Application availability is unaffected<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This proactive testing hardens your system against real-world issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Best Practices for Spot + Auto Scaling + FIS<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increased diversity lowers the chance of interruptions. Diversify instance types and AZs.<\/li>\n\n\n\n<li>Stable spot pools are given priority when capacity-optimised allocation is used.<\/li>\n\n\n\n<li>\u00a0Maintaining on-demand base capacity at all times guarantees a minimum level of availability.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Keep an eye on interruption notices: To gently terminate programs, use Spot instance termination notices.<\/li>\n\n\n\n<li>Automate recovery logic: To handle events brought on by FIS experiments, use System Manager, EventBridge, or AWS Lambda.<\/li>\n\n\n\n<li>\u00a0Conduct regular experiments with chaos:\u00a0 Plan to include FIS scenarios in your resilience tests or CI\/CD pipeline.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Spot Instances offer unmatched cost advantages, but their unpredictable availability can be risky without proper automation and resilience strategies. By combining <strong>EC2 Auto Scaling\u2019s mixed instance policies<\/strong> with <strong><a href=\"https:\/\/www.supportpro.com\/blog\/leveraging-parameter-store-and-securestring-for-configuration-management-in-aws\/\" title=\"\">AWS<\/a> Fault Injection Simulator\u2019s controlled chaos<\/strong>, you can build an infrastructure that\u2019s both cost-efficient and highly reliable. Whether you\u2019re running stateless microservices, containerised workloads, or batch jobs, this powerful combo empowers you to embrace Spot Instances confidently, while staying prepared for the unexpected.<\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile is-vertically-aligned-center has-white-background-color has-background\"><div class=\"wp-block-media-text__content\">\n<p class=\"has-large-font-size wp-block-paragraph\">Facing issues? <\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">Our technical support<br>engineers can solve it. <\/p>\n\n\n\n<!--HubSpot Call-to-Action Code --><span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-3350a795-db50-482f-9911-301930d1b1be\"><span class=\"hs-cta-node hs-cta-3350a795-db50-482f-9911-301930d1b1be\" id=\"hs-cta-3350a795-db50-482f-9911-301930d1b1be\"><!--[if lte IE 8]><div id=\"hs-cta-ie-element\"><\/div><![endif]--><a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/2725694\/3350a795-db50-482f-9911-301930d1b1be\" ><img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-3350a795-db50-482f-9911-301930d1b1be\" style=\"border-width:0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/2725694\/3350a795-db50-482f-9911-301930d1b1be.png\"  alt=\"Contact Us today!\"\/><\/a><\/span><script charset=\"utf-8\" src=\"https:\/\/js.hscta.net\/cta\/current.js\"><\/script><script type=\"text\/javascript\"> hbspt.cta.load(2725694, '3350a795-db50-482f-9911-301930d1b1be', {\"useNewLoader\":\"true\",\"region\":\"na1\"}); <\/script><\/span><!-- end HubSpot Call-to-Action Code -->\n<\/div><figure class=\"wp-block-media-text__media\"><img fetchpriority=\"high\" decoding=\"async\" width=\"904\" height=\"931\" src=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup.png\" alt=\"guy server checkup\" class=\"wp-image-12943 size-full\" srcset=\"https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup.png 904w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-291x300.png 291w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-768x791.png 768w, https:\/\/www.supportpro.com\/blog\/wp-content\/uploads\/2022\/09\/Free-server-checkup-585x602.png 585w\" sizes=\"(max-width: 904px) 100vw, 904px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Scalability, cost-effectiveness, and resilience are essential for contemporary cloud-native applications. Although up to 90% less expensive than On-Demand instances, AWS Spot Instances pose a risk to workload availability due to&hellip;<\/p>\n","protected":false},"author":39,"featured_media":17664,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[69],"tags":[],"class_list":["post-17663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aws"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Discover how EC2 Auto Scaling and AWS Fault Injection Simulator help optimize Spot Instance costs while improving application resilience.\" \/>\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"Anjali Sindhu\"\/>\n\t<link rel=\"canonical\" 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