{"id":1822,"date":"2019-08-07T08:17:14","date_gmt":"2019-08-07T08:17:14","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=1822"},"modified":"2020-05-02T06:50:37","modified_gmt":"2020-05-02T06:50:37","slug":"elasticity-scalability","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-sysops-administrator-associate\/elasticity-scalability\/","title":{"rendered":"Elasticity &#038; Scalability"},"content":{"rendered":"\n<p>Elasticity<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Allows you to match the supply of\nresources\u2014which cost money\u2014to demand. <\/li><li>Matching needs to utilization is critical for\ncost optimization. <\/li><li>Demand includes <ul><li>external\nusage &#8211; number of customers visit website <\/li><\/ul><ul><li>internal\nusage &#8211; application team using development and test environments.<\/li><\/ul><\/li><li>Two types<ul><li>Time-based\nelasticity &#8211; turning off resources when they are not being used<\/li><\/ul><ul><li>Volume-based\nelasticity&nbsp; &#8211; matching scale to the\nintensity of demand, <\/li><\/ul><\/li><\/ul>\n\n\n\n<p><strong>Automating Time-Based Elasticity By<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The AWS Instance Scheduler can create automatic\nstart and stop schedules for EC2 instance, using AWS CloudFormation template<\/li><li>Terminate instances programmatically using\nAmazon EC2 APIs<\/li><li>AWS Lambda functions can also shut down\ninstances when, not being used. <\/li><li>AWS Data Pipeline, web service to process and\nmove data between AWS services<\/li><li>Amazon CloudWatch, a monitoring service for AWS\nresources. It collects and tracks metrics and log files, set alarms, and\nautomatically react to changes in AWS resources<\/li><\/ul>\n\n\n\n<p><strong>Automating Volume-Based Elasticity By<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Amazon ECS \u2013 It can adjust its desired count up\nor down in response to CloudWatch alarms. <\/li><li>Amazon EC2 Spot Fleets \u2013 A Spot Fleet can either\nlaunch instances (scale out) or terminate instances (scale in), within the\nchosen range, in response to one or more scaling policies. <\/li><li>Amazon EMR clusters \u2013 Programmatically scale out\nand scale in core and task nodes in a cluster based on specified rules as per\nscaling policy.<\/li><li>Amazon DynamoDB \u2013 Dynamically adjust provisioned\nthroughput capacity in response to actual traffic patterns.<\/li><\/ul>\n\n\n\n<p>Scalability <\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>is the ability to quickly and easily increase or\ndecrease the resources <\/li><li>It affects resources for<ul><li>compute<\/li><\/ul><ul><li>storage<\/li><\/ul><\/li><li>Auto Scaling is enabled by Amazon CloudWatch at\nno extra cost.<\/li><li>Components<ul><li>Groups\n&#8211; logical groups containing collection of EC2 instances with similar\ncharacteristics for scaling and management purpose.<\/li><\/ul><ul><li>Launch\nConfiguration &#8211; template used by auto scaling group to launch EC2 instances.\ncan specify <ul><li>the\nAMI<\/li><\/ul><ul><li>instances\ntype<\/li><\/ul><ul><li>key\npair<\/li><\/ul><ul><li>security\ngroups <\/li><\/ul><\/li><\/ul><ul><li>Scaling\nPlans &#8211; tells Auto Scaling when and how to scale.<\/li><\/ul><\/li><li>Scaling Types<ul><li>Manual\nscaling &#8211; specify only the changes in maximum, minimum, or desired capacity of\nyour auto scaling groups. <\/li><\/ul><ul><li>Auto-scaling\nmaintains the instances with updated capacity.<\/li><\/ul><\/li><li>Scaling based on <ul><li>Schedule\nor time based<\/li><\/ul><ul><li>demand<\/li><\/ul><\/li><li>Types of Scaling polices:-<\/li><li>Target tracking scaling:- Based on the target\nvalue for a specific metric.<\/li><li>Step scaling:- Based on a set of scaling\nadjustments that vary based on size of alarm breach.<\/li><li>Simple scaling:- Based on a single scaling\nadjustment.<\/li><\/ul>\n\n\n\n<p><strong>Auto Scaling\nLimits<\/strong><\/p>\n\n\n\n<p>Default Limits<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Launch configurations per Region: 200<\/li><li>Auto Scaling groups per Region: 200<\/li><\/ul>\n\n\n\n<p>Auto Scaling Group Limits<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Scaling policies per Auto Scaling group: 50<\/li><li>Scheduled actions per Auto Scaling group: 125<\/li><li>Lifecycle hooks per Auto Scaling group: 50<\/li><li>SNS topics per Auto Scaling group: 10<\/li><li>Classic Load Balancers per Auto Scaling group:\n50<\/li><li>Target groups per Auto Scaling group: 50<\/li><\/ul>\n\n\n\n<p><strong>Scaling Policy Limits<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Step adjustments per scaling policy: 20<\/li><\/ul>\n\n\n\n<p><strong>Auto Scaling Lifecycle<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"586\" height=\"397\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/08\/image043.png\" alt=\"\" class=\"wp-image-1823\"\/><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Elasticity Allows you to match the supply of resources\u2014which cost money\u2014to demand. Matching needs to utilization is critical for cost optimization. Demand includes external usage &#8211; number of customers visit website internal usage &#8211; application team using development and test environments. Two types Time-based elasticity &#8211; turning off resources when they are not being used&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":383,"menu_order":55,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[7,322,323],"class_list":["post-1822","page","type-page","status-publish","hentry","category-amazon-aws","tag-aws","tag-elasticity","tag-scalability"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Elasticity &amp; Scalability - Testprep Training Tutorials<\/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:\/\/www.testpreptraining.ai\/tutorial\/aws-sysops-administrator-associate\/elasticity-scalability\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Elasticity &amp; Scalability - Testprep Training Tutorials\" \/>\n<meta property=\"og:description\" content=\"Elasticity Allows you to match the supply of resources\u2014which cost money\u2014to demand. 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