AWS Study Group 1 Auto Scaling Flashcards
This monitors your applications and automatically adjusts capacity to maintain steady, predictable performance at the lowest possible cost.
AWS Auto Scaling
When should I use Amazon EC2 Auto Scaling vs. AWS Auto Scaling
You should use AWS Auto Scaling if you want more guidance on defining your application scaling plan, or if you want to scale multiple resources beyond EC2, such as Amazon DynamoDB tables and indexes, or Amazon ECS tasks.
At this time, to use AWS Auto Scaling, you must create your applications via AWS CloudFormation or AWS Elastic Beanstalk. AWS Auto Scaling helps you manage all your scaling policies in one place for your applications making tuning easy and intuitive.
You should use Amazon EC2 Auto Scaling if you only need to scale Amazon EC2 Auto Scaling Groups, or just want to maintain the health of your EC2 fleet.
Can EC2 Auto Scaling groups span multiple AWS regions?
EC2 Auto Scaling groups are regional constructs. They can span Availability Zones, but not AWS regions.
What does the term “stateful instances” refer to?
When we refer to a stateful instance, we mean an instance that has data on it, which exists only on that instance.
In general, terminating a stateful instance means that the data (or state information) on the instance is lost. You may want to consider using lifecycle hooks to copy the data off of a stateful instance before it’s terminated, or enable instance protection to prevent Amazon EC2 Auto Scaling from terminating it.
Are CloudWatch agents automatically installed on EC2 instances when you create an Amazon EC2 Auto Scaling group?
If your AMI contains a CloudWatch agent, it’s automatically installed on EC2 instances when you create an EC2 Auto Scaling group. With the stock Amazon Linux AMI, you need to install it (recommended, via yum).
This a fully managed service designed to launch or terminate Amazon EC2 instances automatically to help ensure you have the correct number of Amazon EC2 instances available to handle the load for your application.
Amazon EC2 Auto Scaling
Which regions is AWS Auto Scaling available in?
AWS Auto Scaling is available in US East (Northern Virginia), US East (Ohio), US West (Oregon), EU (Ireland), and Asia Pacific (Singapore) public AWS regions, with more regions to follow.
How much does AWS Auto Scaling cost?
It’s free to use….
Similar to Auto Scaling on individual AWS resources, AWS Auto Scaling is free to use.
AWS Auto Scaling is enabled by Amazon CloudWatch, so service fees apply for CloudWatch and your application resources (such as Amazon EC2 instances, Elastic Load Balancing load balancers, etc.).
