@aws-cdk/aws-autoscaling

The CDK Construct Library for AWS Auto-Scaling

This module is part of the AWS Cloud Development Kit project.

Fleet

Auto Scaling Group

An AutoScalingGroup represents a number of instances on which you run your code. You pick the size of the fleet, the instance type and the OS image:

import ec2 = require('@aws-cdk/aws-ec2');

new ec2.AutoScalingGroup(stack, 'ASG', {
    vpc,
    instanceType: new ec2.InstanceTypePair(InstanceClass.Burstable2, InstanceSize.Micro),
    machineImage: new ec2.LinuxImage({
        'us-east-1': 'ami-97785bed'
    })
});

NOTE: AutoScalingGroup has an property called allowAllOutbound (allowing the instances to contact the internet) which is set to true by default. Be sure to set this to false if you don't want your instances to be able to start arbitrary connections.

AMIs

AMIs control the OS that gets launched when you start your instance.

Depending on the type of AMI, you select it a different way.

The latest version of Windows images are regionally published under labels, so you can select Windows images like this:

new ec2.WindowsImage(WindowsVersion.WindowsServer2016EnglishNanoBase)

You can select the latest Amazon Linux image like this:

new ec2.AmazonLinuxImage()

Other Linux images are unfortunately not currently published this way, so you have to supply a region-to-AMI map when creating a Linux image:

machineImage: new ec2.GenericLinuxImage({
    'us-east-1': 'ami-97785bed',
    'eu-west-1': 'ami-12345678',
    // ...
})

NOTE: Selecting Linux images will change when the information is published in an automatically consumable way.

Allowing Connections

See the documentation of the aws-ec2 package for more information about allowing connections between resources backed by instances.