How to create a few subnets and come up with a python list of the subnet ids in aws

To create multiple subnets in AWS and retrieve their IDs, we will use the aws.ec2.Subnet resource from the Pulumi AWS package. We will create each subnet within a specific VPC, and then use Pulumi's apply function to extract the subnet IDs and place them into a Python list.

Here's a Python program that demonstrates this:

import pulumi
import pulumi_aws as aws

# Assuming you have a VPC created and you know its ID, replace `vpc_id` with your actual VPC ID.
vpc_id = "vpc-12345678"

# Define the list of CIDR blocks for your subnets.
# Ensure these are non-overlapping and within the VPC's CIDR range.
cidr_blocks = [
    "10.0.1.0/24",
    "10.0.2.0/24",
    "10.0.3.0/24"
]

# Create a list to hold references to the subnet resources.
subnets = []

# Iterate over the CIDR blocks and create subnets.
for cidr_block in cidr_blocks:
    subnet = aws.ec2.Subnet(f"subnet-{cidr_block}",
                            vpc_id=vpc_id,
                            cidr_block=cidr_block,
                            tags={"Name": f"subnet-{cidr_block}"})
    subnets.append(subnet)

# Use `apply` to transform the list of subnet resources into a list of subnet IDs.
subnet_ids = pulumi.Output.all(*[subnet.id for subnet in subnets]).apply(lambda ids: ids)

# Export the subnet IDs
pulumi.export("subnet_ids", subnet_ids)

In this program:

We define the CIDR blocks for the subnets and the VPC ID.
We create subnets within the VPC using the aws.ec2.Subnet resource.
We use the apply function on the output properties of the subnet resources to gather the IDs into a Python list.
Finally, we export the list of subnet IDs as a stack output.

Replace vpc_id and cidr_blocks with your actual VPC ID and desired CIDR blocks respective to your infrastructure requirements.