1. Launching an EC2 Auto Scaling group within the default VPC

    TypeScript

    To launch an EC2 Auto Scaling group within the default VPC, you will need to follow these steps:

    1. Create a Launch Configuration: This will define the template for the EC2 instances that your Auto Scaling group will manage. This includes details such as the instance type, the AMI ID, and other configurations like security groups, key pair, and block device mappings.

    2. Create an Auto Scaling Group: This will manage the collection of EC2 instances. It will use the Launch Configuration you've created and will define parameters like the desired capacity of instances, the minimum and maximum number of instances, and the subnets where instances can be launched.

    3. Setup Scaling Policies (Optional): These are rules that determine when and how to scale the number of EC2 instances in your Auto Scaling group, such as based on CPU usage or network traffic. These policies are not strictly necessary for launching an Auto Scaling group but are commonly used to handle changing load on your application.

    Here's a Pulumi TypeScript program that demonstrates these steps:

    import * as aws from "@pulumi/aws"; // Note: Ensure that your AWS region supports the AMI and instance types used in this code. // You may need to modify these values based on your AWS account and region. // Create an EC2 Launch Configuration using an existing AMI. const launchConfig = new aws.ec2.LaunchConfiguration("appLaunchConfig", { imageId: "ami-0c55b159cbfafe1f0", // Example AMI ID, replace with a valid one for your region instanceType: "t2.micro", // You can choose a different instance type based on your requirements }); // Get the default VPC and its subnets to use with the Auto Scaling Group. const vpc = aws.ec2.getDefaultVpc(); const subnets = vpc.then(vpc => aws.ec2.getSubnetIds({ vpcId: vpc.id })); // Create an Auto Scaling Group using the Launch Configuration created earlier. const autoScalingGroup = new aws.autoscaling.Group("appAutoScalingGroup", { vpcZoneIdentifiers: subnets.then(s => s.ids), maxSize: 2, minSize: 1, launchConfiguration: launchConfig.name, tags: [{ key: "Name", value: "pulumi-asg-instance", propagateAtLaunch: true, }] }); // Export the Auto Scaling Group name and the VPC ID. export const autoScalingGroupName = autoScalingGroup.name; export const defaultVpcId = vpc.then(vpc => vpc.id);

    Explanation:

    • aws.ec2.LaunchConfiguration: This resource defines the template for the EC2 instances that will be managed by the Auto Scaling group. The imageId and instanceType are specifications for the AMI and size of the EC2 instances. Launch Configuration

    • aws.ec2.getDefaultVpc: We use this function to retrieve the default VPC available in your AWS account. The Auto Scaling group needs this information to locate where it will launch EC2 instances. Default VPC

    • aws.ec2.getSubnetIds: This function fetches all subnet IDs associated with the default VPC. The Auto Scaling group will need at least one subnet to launch EC2 instances.

    • aws.autoscaling.Group: This resource is the actual Auto Scaling group that will manage the EC2 instances. The vpcZoneIdentifiers specifies the subnets where EC2 instances can be launched, while maxSize and minSize control scaling behavior – setting the maximum and minimum number of instances that can be running under this group. Auto Scaling Group

    • Export statements: These make it possible to output the name of the Auto Scaling group and the ID of the VPC used, which can be useful for further reference or integration with other infrastructure components.

    Make sure to replace placeholder values (for instance, ami-0c55b159cbfafe1f0) with actual values that are valid for your AWS account and region before running this program.


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