Auto Scaling groups

Auto Scaling is used to manage EC2 instances, whereby a number of instances can be created for our application based on traffic. Auto Scaling helps to keep a group of healthy instances for applications to run. Based on the Auto Scaling configuration, we can add more instances. An Auto Scaling event can be triggered from CloudWatch monitoring, where it measures the metrics configured and if it achieves its threshold limit, it triggers an event to the Auto Scaling group.

AWS Management Console

Go to AWS EC2 Management Console at https://console.aws.amazon.com/ec2/home.

Creating an Auto Scaling group

Create an Auto Scaling group, which will launch scalable instances:

1. Click Launch Configuration under Auto Scaling on the left menu.
2. Click Create Auto Scaling Group.
3. Create the Auto Scaling Group:

Figure 3.34: Creating the Auto Scaling group

Click Create launch configuration.

4. Select an AMI:

Figure 3.35: Selecting an AMI for the launch configuration

Here we need to select the AMI for our...