Effective DevOps with AWS

Adding an Auto Scaling capability

We are now going to add the Auto Scaling capability to our application. This will be done in three major phases:

1. Create a launch configuration that the Auto Scaling group uses to launch the EC2 instances.
2. Create the actual Auto Scaling group.
3. Create the scaling policies that will enable us to have a dynamic scaling capability by relying on CloudWatch metrics.

At the top of the script, in the import section, add the following:

from troposphere.autoscaling import ( 
    AutoScalingGroup,
    LaunchConfiguration,
    ScalingPolicy, 
) 

We will be able to reuse all the resources previously created when launching an EC2 instance. Most of them will stay untouched except for the security group. In the Auto Scaling group, we ...