What are the three components of EC2 Auto Scaling?
EC2 Auto Scaling requires you to specify three main components: a launch template or a launch configuration as a configuration template for the EC2 instances, an EC2 Auto Scaling group that allows you to specify your minimum, maximum, and desired capacity of your instances, and scaling policies that allow you to configure a group to scale based on the occurrence of specified conditions or on a schedule. This information can be found in the video “Amazon EC2 Auto Scaling”.
——————————————————————————————-
ELB automatically scales depending on the traffic. It handles the incoming traffic and sends it to your backend application. ELB also integrates seamlessly with EC2 Auto Scaling. As soon as a new EC2 instance is added to or removed from the EC2 Auto Scaling group, ELB is notified and can begin to direct traffic to the new instance. This content is covered in “Route Traffic with Amazon Elastic Load Balancing”.
——————————————————————————————-
Instances that are launched by your Auto Scaling group are automatically registered with the load balancer. Likewise, instances that are terminated by your Auto Scaling group are automatically deregistered from the load balancer. Check out Reading 4.5 for more information.
——————————————————————————————-
Application Load Balancer is a layer 7 load balancer that routes HTTP and HTTPs traffic, with support for rules. Due to this, Application Load Balancer is the correct choice for this application. This content is covered in “Route Traffic with Amazon Elastic Load Balancing”.
——————————————————————————————-
An application can be scaled vertically by adding more power to an existing machine or it can be scaled horizontally by adding more machines to your pool of resources. This information is found in the video “Optimizing Solutions on AWS”.
——————————————————————————————-
AWS calls the elements you can add to a Dashboard widgets.
——————————————————————————————-
A metric alarm has the following possible states: OK – The metric or expression is within the defined threshold. ALARM – The metric or expression is outside of the defined threshold. INSUFFICIENT_DATA – The alarm has just started, the metric is not available, or not enough data is available for the metric to determine the alarm state.
