How to deploy an EC2 prefix list in AWS?

Question

Pulumi · Accepted Answer

Sure, you can create and manage an EC2 prefix list using Pulumi. It is useful when you want to share a set of CIDR blocks that you want to manage as a group.

A prefix list is a named set of CIDR blocks. The prefix list ID can be used in a security group or a route table similar to a security group or network ACL ID.
The AWS managed prefix lists include the following:
- Amazon S3
- AWS CloudFront
- AWS CodeBuild
- Amazon DynamoDB
- Amazon Connect

However, you can also create your own prefix list if you need to manage a list of IP address ranges.

Here is a basic example of how you can use Pulumi to manage an EC2 prefix list:
```typescript
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

const example = new aws.ec2.ManagedPrefixList("example", {
    addressFamily: "IPv6",
    entries: [{
        cidr: "2001:db8::/32",
    }],
    maxEntries: 5,
});
```
In this TypeScript Pulumi program, we utilize the "aws.ec2.ManagedPrefixList" resource ([Documentation Link](https://www.pulumi.com/registry/packages/aws/api-docs/ec2/managedprefixlist/)) from the AWS Pulumi package.

This program defines one resource, an EC2 Managed Prefix List:
* `addressFamily: "IPv6"`: Refers to which version of the IP schema to use. This can be either IPv4 or IPv6.
* `entries: [{ cidr: "2001:db8::/32" }]`: Sets the list of CIDR blocks associated with this prefix list. Here we just have one CIDR block as an example.
* `maxEntries: 5`: The maximum number of entries that the prefix list can contain. Here we limit this to 5 entries.

Once deployed, this prefix list will be available to be used in AWS's security groups or route tables.