AWS Certified Developer - Associate
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Your company currently manages MySQL databases hosted on EC2 instances, providing full administrative control over their operation. These databases are queried by applications running on other EC2 instances, which are organized within an Auto Scaling Group (ASG). The data retrieved from these queries is utilized to present information on dashboards, which are accessed through mobile phones, tablets, and web browsers.
Your manager has requested that the Auto Scaling Group should dynamically scale in response to the number of incoming requests per minute. What steps can you take to achieve this?
Your company currently manages MySQL databases hosted on EC2 instances, providing full administrative control over their operation. These databases are queried by applications running on other EC2 instances, which are organized within an Auto Scaling Group (ASG). The data retrieved from these queries is utilized to present information on dashboards, which are accessed through mobile phones, tablets, and web browsers.
Your manager has requested that the Auto Scaling Group should dynamically scale in response to the number of incoming requests per minute. What steps can you take to achieve this?
Explanation:
You create a CloudWatch custom metric and build an alarm to scale your ASG
Here we need to scale on the metric "number of requests per minute", which is a custom metric we need to create, as it's not readily available in CloudWatch.
Metrics produced by AWS services are standard resolution by default. When you publish a custom metric, you can define it as either standard resolution or high resolution. When you publish a high-resolution metric, CloudWatch stores it with a resolution of 1 second, and you can read and retrieve it with a period of 1 second, 5 seconds, 10 seconds, 30 seconds, or any multiple of 60 seconds.
Incorrect options:
Attach an Elastic Load Balancer - This is not what you need for auto-scaling. An Elastic Load Balancer distributes workloads across multiple compute resources and checks your instances' health status to name a few, but it does not automatically increase and decrease the number of instances based on the application requirement.
Attach additional Elastic File Storage - This is a file storage service designed for performance. Amazon Elastic File System (Amazon EFS) provides a simple, scalable, fully managed elastic NFS file system for use with AWS Cloud services and on-premises resources. It is built to scale on-demand to petabytes without disrupting applications, growing and shrinking automatically as you add and remove files, eliminating the need to provision and manage capacity to accommodate growth. This cannot be used to facilitate auto-scaling.