How to Merge Pulumi Projects in a Monorepo?

To merge Pulumi projects in a monorepo using TypeScript, we will follow these steps:

1. Introduction: Provide an overview of the solution and the key services involved.
2. Step-by-Step Explanation: Detail the steps required to merge Pulumi projects in a monorepo.
3. Key Points: Highlight the important aspects to consider when merging Pulumi projects.
4. Conclusion: Summarize the solution and its benefits.

Introduction

In this guide, we will learn how to merge multiple Pulumi projects into a single monorepo using TypeScript. This approach helps in managing infrastructure as code (IaC) more efficiently by consolidating different projects into a single repository. The key services involved in this process include Pulumi CLI, TypeScript, and version control systems like Git.

Step-by-Step Explanation

Step 1: Set Up the Monorepo

• Create a new directory for the monorepo.
• Initialize a new Git repository in the directory.
• Create subdirectories for each Pulumi project you want to merge.

Step 2: Initialize Pulumi Projects

• Navigate to each subdirectory and initialize a new Pulumi project using pulumi new command.
• Choose TypeScript as the language for the Pulumi projects.

Step 3: Configure Project Dependencies

• Create a package.json file in the root of the monorepo to manage dependencies for all projects.
• Add Pulumi and other required dependencies to the package.json file.
• Run npm install to install the dependencies.

Step 4: Update Pulumi Configuration

• Update the Pulumi configuration files (Pulumi.yaml and Pulumi.<stack>.yaml) for each project to reflect the new directory structure.
• Ensure that the stack names and configurations are unique for each project.

Step 5: Create a Centralized Pulumi Script

• Create a centralized Pulumi script in the root of the monorepo to manage all projects.
• Import and configure each Pulumi project in the centralized script.
• Use Pulumi’s stack references to manage dependencies between projects if needed.

Step 6: Deploy the Projects

• Use the Pulumi CLI to deploy the projects from the centralized script.
• Run pulumi up to deploy the infrastructure.

Key Points

• Ensure that each Pulumi project has a unique stack name and configuration.
• Use a centralized package.json file to manage dependencies for all projects.
• Utilize Pulumi’s stack references to manage dependencies between projects.
• Keep the monorepo well-organized with clear directory structures for each project.

Conclusion

Merging Pulumi projects into a monorepo using TypeScript simplifies the management of infrastructure as code by consolidating multiple projects into a single repository. This approach enhances collaboration, reduces duplication, and streamlines the deployment process. By following the steps outlined in this guide, you can efficiently manage and deploy your infrastructure using Pulumi in a monorepo setup.

Full Code Example

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Project 1: S3 Bucket
const bucket = new aws.s3.Bucket("my-bucket", {
    bucket: "my-bucket",
});

// Project 2: EC2 Instance
const instance = new aws.ec2.Instance("my-instance", {
    instanceType: "t2.micro",
    ami: "ami-0c55b159cbfafe1f0", // Amazon Linux 2 AMI
});

// Export the names of the resources
export const bucketName = bucket.bucket;
export const instanceId = instance.id;

// Stack references (if needed)
// const otherStack = new pulumi.StackReference("org/project/stack");
// const otherOutput = otherStack.getOutput("outputName");