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  4. Pulumi: Modern Infrastructure as Code With Real Programming Languages

Pulumi: Modern Infrastructure as Code With Real Programming Languages

Pulumi is an Infrastructure as Code platform that lets developers and teams create, deploy, and manage cloud resources using familiar programming languages.

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Vidyasagar (Sarath Chandra) Machupalli FBCS user avatar
Vidyasagar (Sarath Chandra) Machupalli FBCS
DZone Core CORE ·
Aug. 26, 25 · Tutorial
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After a long journey with Terraform, when Terraform introduced HCL2, I started exploring for an alternative IaC tool to write code in my programming language of choice, and that's when I found Pulumi. Founded in 2017, Pulumi has emerged as a powerful alternative to traditional IaC tools by bridging the gap between software development and infrastructure management. 

Pulumi is a modern Infrastructure as Code (IaC) platform that enables developers and infrastructure teams to create, deploy, and manage cloud resources using familiar programming languages instead of domain-specific languages (DSLs) or YAML templates.

What Is Pulumi?

Pulumi is an open-source Infrastructure as Code (IaC) tool that allows you to define cloud infrastructure using general-purpose programming languages such as TypeScript, JavaScript, Python, Go, C#, Java, and YAML. Instead of learning proprietary configuration languages, developers can leverage their existing programming skills to build, configure, and deploy infrastructure across multiple cloud providers, including AWS, Azure, Google Cloud Platform, IBM Cloud, Kubernetes, and many others.

The code snippets in this article will be in Python programming language.

Core Features of Pulumi

1. Multi-Language Support

Pulumi supports multiple programming languages, allowing teams to choose the language they're most comfortable with:

  • TypeScript/JavaScript: Ideal for web developers and those familiar with Node.js
  • Python: Perfect for data scientists, DevOps engineers, and Python developers
  • Go: Great for system programmers and those building high-performance applications
  • C#: Excellent for .NET developers and enterprise environments
  • Java: Suitable for enterprise Java developers
  • YAML: For those who prefer declarative configuration

2. Universal Cloud Support

Pulumi provides comprehensive support for 100+ cloud providers and services, enabling you to manage infrastructure across any platform using consistent APIs and workflows.

3. State Management

Pulumi automatically manages infrastructure state, tracking the current state of your resources and enabling safe updates, rollbacks, and collaborative workflows. State can be stored in:

  • Pulumi Service (SaaS)
  • Self-managed backends (S3, Azure Blob, GCS)
  • Local filesystem

4. Policy as Code

Pulumi CrossGuard allows you to define and enforce policies across your infrastructure using the same programming languages, ensuring compliance and security standards are met automatically.

5. Secrets Management

Built-in secrets management encrypts sensitive configuration data like API keys, passwords, and certificates, ensuring they're never stored in plain text.

6. Testing and Validation

Since infrastructure is defined in real programming languages, you can write unit tests, integration tests, and use standard testing frameworks to validate your infrastructure code.

7. Rich Ecosystem

Pulumi integrates with existing development tools, including:

  • CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins)
  • IDEs with full IntelliSense and debugging support
  • Package managers (npm, pip, NuGet)
  • Testing frameworks

Installation and Setup

Installing Pulumi

Prerequisites

  • Python 3.7 or later
  • pip (Python package manager)

Step 1: Install Pulumi CLI

macOS:

Shell
 
# Using Homebrew
brew install pulumi

# Using curl
curl -fsSL https://get.pulumi.com | sh


Windows:

Shell
 
# Using Chocolatey
choco install pulumi

# Using Windows installer
# Download from https://github.com/pulumi/pulumi/releases


Linux:

Shell
 
# Using curl
curl -fsSL https://get.pulumi.com | sh

# Add to PATH
export PATH=$PATH:$HOME/.pulumi/bin


Step 2: Verify Installation

Shell
 
pulumi version


Step 3: Install Python Dependencies

Shell
 
# Install pulumi Python SDK
pip install pulumi

# Install provider packages as needed
pip install pulumi-random
pip install pulumi-docker
# Add other providers as required


Creating Your First Project

Shell
 
# Create a new directory
mkdir my-pulumi-project
cd my-pulumi-project

# Initialize a new Pulumi project
pulumi new python

# This creates the basic project structure

Creating the project


Check this Pulumi code repository for code samples.

Pulumi Project Structure

A typical Pulumi Python project has the following structure:

Plain Text
 
my-pulumi-project/
├── __main__.py          # Main program entry point
├── Pulumi.yaml          # Project definition file
├── Pulumi.dev.yaml      # Stack configuration (dev stack)
├── requirements.txt     # Python dependencies
├── venv/               # Python virtual environment (optional)
└── components/         # Reusable components (optional)
    ├── __init__.py
    └── web_app.py


Key Files Explained

Pulumi.yaml

Project definition:

YAML
 
name: my-pulumi-project
runtime: python
description: A minimal Python Pulumi program


main.py

Main program file:

Python
 
"""A Python Pulumi program"""
import pulumi

# Your infrastructure code goes here
pulumi.export("message", "Hello, Pulumi!")


requirements.txt

Python dependencies:

Plain Text
 
pulumi>=3.0.0,<4.0.0
pulumi-random


Getting Started With Code Examples

Pulumi Terminology and Concepts

Understanding Pulumi's terminology is crucial for effective infrastructure management. Here's a comprehensive overview of key concepts and how they compare to Terraform:

Pulumi hierarchy

Pulumi hierarchy

Core Pulumi Concepts

Projects

A Project is a directory containing a Pulumi program and its metadata. It's defined by a Pulumi.yaml file and contains all the code that describes your infrastructure.

YAML
 
# Pulumi.yaml
name: my-web-app
runtime: python
description: A web application infrastructure


Programs

A Program is the code that defines your infrastructure resources. In Python, this is typically your __main__.py file or the entry point specified in your project configuration.

Python
 
# __main__.py - This is your Pulumi program
import pulumi
import pulumi_random as random

# This program defines infrastructure resources
password = random.RandomPassword("app-password", length=16)
pulumi.export("password", pulumi.Output.secret(password.result))


Stacks

A Stack is an isolated, independently configurable instance of a Pulumi program. Each stack has its own configuration, secrets, and state. You can have multiple stacks for the same program (e.g., dev, staging, production).

Shell
 
# Create and manage stacks
pulumi stack init dev
pulumi stack init staging  
pulumi stack init production

# Switch between stacks
pulumi stack select dev


Resources

Resources represent cloud infrastructure components like virtual machines, databases, or storage buckets. They are the fundamental building blocks in Pulumi.

Python
 
import pulumi_random as random

# This creates a resource
pet_name = random.RandomPet("my-pet", 
    length=2,
    separator="-"
)

# Resources have properties and methods
pulumi.export("pet_id", pet_name.id)


State

State is Pulumi's record of which resources your program has created and their current properties. Pulumi automatically manages state for you.

Configuration

Configuration allows you to parameterize your Pulumi programs. Configuration values are stored per stack and can include secrets.

Python
 
import pulumi

config = pulumi.Config()
environment = config.require("environment")  # Required value
instance_count = config.get_int("instanceCount") or 3  # Optional with default
database_password = config.require_secret("dbPassword")  # Secret value


Outputs

Outputs are values that are not known until your infrastructure is created. They represent properties of resources that are computed during deployment.

Python
 
import pulumi
import pulumi_random as random

# Create a resource
password = random.RandomPassword("db-password", length=16)

# The 'result' is an Output - its value isn't known until deployment
pulumi.export("db_password", pulumi.Output.secret(password.result))

# You can transform outputs
formatted_password = password.result.apply(lambda pwd: f"Password: {pwd}")


Component Resources

Component Resources are reusable infrastructure patterns that group multiple resources together into logical units.

Python
 
class DatabaseCluster(pulumi.ComponentResource):
    def __init__(self, name: str, args: dict, opts=None):
        super().__init__("custom:DatabaseCluster", name, None, opts)
        
        # Create multiple resources as part of this component
        self.primary_password = random.RandomPassword(f"{name}-primary-pwd", 
            length=16, opts=pulumi.ResourceOptions(parent=self))
        
        self.replica_password = random.RandomPassword(f"{name}-replica-pwd", 
            length=16, opts=pulumi.ResourceOptions(parent=self))
        
        self.register_outputs({
            "primary_password": self.primary_password.result,
            "replica_password": self.replica_password.result
        })

# Use the component
db_cluster = DatabaseCluster("my-cluster", {})


Pulumi vs. Terraform Terminologies

Concept Pulumi Terraform Description
Project Organization Project Configuration Top-level container for infrastructure code
Environment Isolation Stack Workspace Isolated instances of the same infrastructure
Code Definition Program Configuration Files The actual infrastructure code
Infrastructure Units Resource Resource Individual cloud components
State Management State State File Record of managed infrastructure
Dynamic Values Output Output Values computed during deployment
Reusable Patterns Component Resource Module Reusable infrastructure patterns
Configuration Config Variables Runtime parameters
Secrets Secret Config Sensitive Variables Encrypted configuration values


Detailed Comparison

Projects vs. Configuration

Plain Text
 
# Pulumi Project Structure
my-app/
├── Pulumi.yaml          # Project definition
├── __main__.py          # Program code
└── requirements.txt     # Dependencies


Plain Text
 
# Terraform Configuration Structure  
my-app/
├── main.tf              # Main configuration
├── variables.tf         # Input variables
├── outputs.tf           # Output values
└── terraform.tf         # Provider configuration



Stacks vs. Workspaces

Pulumi stacks:

Shell
 
# Each stack maintains separate state and config
pulumi stack init dev
pulumi config set environment development
pulumi config set instanceCount 2

pulumi stack init production  
pulumi config set environment production
pulumi config set instanceCount 5


Python
 
# Access stack information in code
import pulumi

stack_name = pulumi.get_stack()  # Returns current stack name
project_name = pulumi.get_project()  # Returns project name

# Stack-aware resource naming
resource_name = f"{project_name}-{stack_name}-database"


Terraform workspaces:

Shell
 
# Terraform workspaces
terraform workspace new dev
terraform workspace new production
terraform workspace select dev


Configuration Management

Pulumi configuration:

Shell
 
# Set configuration per stack
pulumi config set app:name "MyApp"
pulumi config set app:instanceCount 3
pulumi config set --secret app:dbPassword "secretPassword123"

# Configuration files are created automatically
# Pulumi.dev.yaml, Pulumi.production.yaml, etc.


Python
 
# Use configuration in Python
import pulumi

config = pulumi.Config("app")
app_name = config.require("name")
instance_count = config.get_int("instanceCount") or 1
db_password = config.require_secret("dbPassword")

# Configuration can be objects too
config.get_object("tags") or {"environment": "dev"}


Terraform variables:

Plain Text
 
# variables.tf
variable "app_name" {
  description = "Application name"
  type        = string
}

variable "instance_count" {
  description = "Number of instances"
  type        = number
  default     = 1
}

variable "db_password" {
  description = "Database password"
  type        = string
  sensitive   = true
}


State Management

Pulumi state:

  • Automatically managed
  • Multiple backend options (Pulumi Service, S3, Azure Blob, etc.)
  • Built-in encryption
  • No manual state file manipulation needed
Python
 
# State is handled automatically
import pulumi_random as random

# This resource's state is automatically tracked
password = random.RandomPassword("my-password", length=16)

# No need to manage state files manually


Terraform state:

  • Requires explicit backend configuration
  • Manual state file management sometimes needed
  • State locking configuration required for teams

Advanced Pulumi Concepts

Transformations

Transformations allow you to modify resources automatically during creation:

Python
 
def add_tags(args):
    """Add common tags to all resources"""
    if hasattr(args, 'props') and 'tags' in args.props:
        args.props['tags'] = {
            **args.props.get('tags', {}),
            'ManagedBy': 'Pulumi',
            'Stack': pulumi.get_stack()
        }
    return pulumi.ResourceTransformationResult(args.props, args.opts)

# Apply transformation to all child resources
opts = pulumi.ResourceOptions(transformations=[add_tags])


Aliases

Aliases help with resource refactoring and renaming:

Python
 
# When renaming resources, use aliases to maintain continuity
old_resource = random.RandomPassword("new-name",
    length=16,
    opts=pulumi.ResourceOptions(
        aliases=["urn:pulumi:stack::project::pulumi:providers:random::old-name"]
    )
)


This terminology section provides a comprehensive foundation for understanding Pulumi's concepts and how they relate to Terraform, making it easier for developers familiar with either tool to understand both platforms.

Code Examples

Example 1: Basic Resource Definition

Python
 
import pulumi
import pulumi_random as random

# Create a random password
password = random.RandomPassword("db-password",
    length=16,
    special=True
)

# Create a random pet name
pet_name = random.RandomPet("my-pet",
    length=2,
    separator="-"
)

# Export outputs (password will be encrypted in state)
pulumi.export("db_password", pulumi.Output.secret(password.result))
pulumi.export("pet_name", pet_name.id)


Example 2: Configuration and Conditional Logic

Python
 
import pulumi
import pulumi_random as random

# Read configuration
config = pulumi.Config()
environment = config.require("environment")
enable_monitoring = config.get_bool("enableMonitoring") or False
instance_count = config.get_int("instanceCount") or 3

# Create resources based on environment
if environment == "production":
    instance_size = "large"
    replica_count = 5
elif environment == "staging":
    instance_size = "medium" 
    replica_count = 3
else:
    instance_size = "small"
    replica_count = 1

# Generate random names for instances
instance_names = []
for i in range(instance_count):
    name = random.RandomPet(f"instance-name-{i}",
        length=2,
        separator="-"
    )
    instance_names.append(name)

# Create tags for all resources
common_tags = {
    "environment": environment,
    "project": "my-project",
    "managed-by": "pulumi"
}

# Export configuration and generated names
pulumi.export("environment", environment)
pulumi.export("instance_size", instance_size)
pulumi.export("replica_count", replica_count)
pulumi.export("instance_names", [name.id for name in instance_names])


Example 3: Using Loops and Lists

Python
 
import pulumi
import pulumi_random as random

config = pulumi.Config()
environments = config.get_object("environments") or ["dev", "staging", "prod"]
regions = config.get_object("regions") or ["us-east-1", "us-west-2"]

# Create resources for each environment and region combination
resources = {}

for env in environments:
    resources[env] = {}
    for region in regions:
        # Create a unique identifier for this environment-region combo
        identifier = random.RandomId(f"{env}-{region}-id",
            byte_length=8
        )
        
        # Create a password for this combination
        password = random.RandomPassword(f"{env}-{region}-password",
            length=16,
            special=True
        )
        
        resources[env][region] = {
            "id": identifier.hex,
            "password": password.result
        }

# Export organized outputs
for env in environments:
    for region in regions:
        pulumi.export(f"{env}_{region}_id", resources[env][region]["id"])
        pulumi.export(f"{env}_{region}_password", 
                     pulumi.Output.secret(resources[env][region]["password"]))


Example 4: Component Resources (Reusable Components)

Python
 
import pulumi
import pulumi_random as random

class WebApplication(pulumi.ComponentResource):
    """A reusable web application component"""
    
    def __init__(self, name: str, args: dict, opts: pulumi.ResourceOptions = None):
        super().__init__("custom:WebApplication", name, None, opts)
        
        # Create application identifier
        self.app_id = random.RandomId(f"{name}-app-id",
            byte_length=4,
            opts=pulumi.ResourceOptions(parent=self)
        )
        
        # Create database password
        self.db_password = random.RandomPassword(f"{name}-db-password",
            length=16,
            special=True,
            opts=pulumi.ResourceOptions(parent=self)
        )
        
        # Create application configuration
        self.config = {
            "app_name": args.get("app_name", name),
            "runtime": args.get("runtime", "python"),
            "environment": args.get("environment", "development"),
            "database_url": self.db_password.result.apply(
                lambda pwd: f"postgresql://user:{pwd}@localhost:5432/{name}"
            )
        }
        
        # Create monitoring if enabled
        self.monitoring_enabled = args.get("enable_monitoring", False)
        if self.monitoring_enabled:
            self.monitoring_token = random.RandomPassword(f"{name}-monitoring-token",
                length=32,
                special=False,
                opts=pulumi.ResourceOptions(parent=self)
            )
        
        # Register outputs
        self.register_outputs({
            "app_id": self.app_id.hex,
            "config": self.config
        })

# Use the component
web_app = WebApplication("my-web-app", {
    "app_name": "hello-world",
    "runtime": "python",
    "environment": "production",
    "enable_monitoring": True
})

# Create multiple applications
apps = {}
app_names = ["frontend", "backend", "api"]

for app_name in app_names:
    apps[app_name] = WebApplication(f"{app_name}-app", {
        "app_name": app_name,
        "runtime": "python",
        "environment": pulumi.get_stack(),
        "enable_monitoring": app_name == "api"  # Only enable monitoring for API
    })

# Export application endpoints
pulumi.export("primary_app_id", web_app.app_id.hex)
for app_name, app in apps.items():
    pulumi.export(f"{app_name}_app_id", app.app_id.hex)


Example 5: Working With Transformations

Python
 
import pulumi
import pulumi_random as random

def add_common_tags(args):
    """Transformation function to add common tags to all resources"""
    if hasattr(args, 'props') and 'tags' in args.props:
        # Add common tags
        common_tags = {
            "project": "my-project",
            "owner": "dev-team",
            "stack": pulumi.get_stack(),
            "created-by": "pulumi"
        }
        
        # Merge with existing tags
        existing_tags = args.props.get('tags', {})
        args.props['tags'] = {**existing_tags, **common_tags}
    
    return pulumi.ResourceTransformationResult(args.props, args.opts)

# Apply transformations to resources
transformation_opts = pulumi.ResourceOptions(
    transformations=[add_common_tags]
)

# Create resources with automatic tag application
server_id = random.RandomId("web-server-id",
    byte_length=8,
    opts=transformation_opts
)

database_password = random.RandomPassword("database-password",
    length=20,
    special=True,
    opts=transformation_opts
)

pulumi.export("server_id", server_id.hex)
pulumi.export("db_password", pulumi.Output.secret(database_password.result))


Configuration Management

Set up configuration for your Pulumi projects:

Shell
 
# Set configuration values
pulumi config set environment development
pulumi config set instanceCount 3
pulumi config set --secret dbPassword mySecretPassword123
pulumi config set --path regions[0] us-east-1
pulumi config set --path regions[1] us-west-2

# List all configuration
pulumi config

# Get configuration in Python
config = pulumi.Config()
environment = config.require("environment")
instance_count = config.get_int("instanceCount") or 1
regions = config.get_object("regions") or ["us-east-1"]


Testing Infrastructure Code

Python
 
# test_infrastructure.py
import unittest
from unittest.mock import patch
import pulumi

class TestInfrastructure(unittest.TestCase):
    
    def setUp(self):
        # Set up Pulumi mocks
        pulumi.runtime.set_mocks({
            'newResource': self.new_resource_mock,
            'call': self.call_mock
        })
    
    def new_resource_mock(self, args):
        return {
            'id': f"{args.name}_id",
            'state': args.inputs
        }
    
    def call_mock(self, args):
        return args.inputs
    
    @patch('pulumi.Config')
    def test_resource_creation(self, mock_config):
        # Mock configuration
        mock_config.return_value.require.return_value = "test"
        mock_config.return_value.get_int.return_value = 2
        
        # Import and test your infrastructure
        import __main__
        
        # Add your test assertions here
        self.assertTrue(True)  # Replace with actual tests

if __name__ == '__main__':
    unittest.main()


Running Your Pulumi Program

Shell
 
# Preview changes
pulumi preview

# Deploy infrastructure
pulumi up

# View stack outputs
pulumi stack output

# Update infrastructure
pulumi up

# Destroy infrastructure
pulumi destroy

Running the pulumi project

Running the Pulumi project


Opening the link from the pulumi up output will show you the updates. 

Updates

Pulumi vs. Other IaC Tools

Pulumi vs. Terraform

Feature Pulumi Terraform
Language Real programming languages (Python, TypeScript, Go, etc.) HCL (HashiCorp Configuration Language)
Learning Curve Leverages existing programming knowledge Requires learning HCL syntax
Logic & Control Flow Full programming constructs (loops, conditionals, functions) Limited HCL constructs
Testing Standard testing frameworks and practices Limited testing capabilities
IDE Support Full IntelliSense, debugging, refactoring Basic syntax highlighting
State Management Built-in with multiple backend options Requires separate state configuration
Modularity Native language packages and modules Terraform modules
Community Growing ecosystem Large, mature ecosystem


Pulumi vs. Ansible

Feature Pulumi Ansible
Primary Use Infrastructure provisioning Configuration management
Approach Declarative with imperative capabilities Imperative playbooks
Language Programming languages YAML
State Tracking Built-in state management Stateless (idempotent)
Cloud Focus Cloud-native infrastructure Server configuration


To understand what Ansible offers as a platform, check this article on DZone.

Use Cases for Pulumi

1. Multi-Cloud Deployments

Organizations seeking to avoid vendor lock-in can use Pulumi to deploy across multiple cloud providers using consistent tooling and practices.

2. Developer-Friendly Infrastructure

Teams with strong programming backgrounds can leverage existing skills instead of learning new DSLs, leading to faster adoption and reduced learning curves.

3. Complex Infrastructure Logic

When infrastructure requires complex logic, conditionals, or dynamic resource creation, Pulumi's programming language approach provides more flexibility than template-based tools.

4. Continuous Integration/Deployment

Pulumi integrates seamlessly with existing CI/CD pipelines, allowing infrastructure changes to be tested, reviewed, and deployed using standard software development practices.

5. Policy and Compliance

Organizations can implement policy as code using CrossGuard to ensure infrastructure compliance across all deployments automatically.

Best Practices

1. Project Organization

  • Use separate projects for different environments (dev, staging, production).
  • Implement proper naming conventions.
  • Organize code into reusable components.

2. Configuration Management

  • Use Pulumi's configuration system for environment-specific values.
  • Store secrets securely using Pulumi's encryption.
  • Avoid hardcoding values in infrastructure code.

3. Testing Strategy

  • Write unit tests for infrastructure components.
  • Implement integration tests for full deployments.
  • Use property-based testing for complex scenarios.

4. State Management

  • Choose an appropriate backend for your team size and requirements.
  • Implement proper access controls for state files.
  • Regular backups of state data.

5. Version Control

  • Store infrastructure code in version control.
  • Use branching strategies appropriate for your deployment model.
  • Implement code review processes.

Conclusion

Pulumi represents a paradigm shift in infrastructure as code, bringing the power and flexibility of general-purpose programming languages to infrastructure management. By allowing developers to use familiar languages and tools, Pulumi reduces the barrier to entry for infrastructure automation while providing powerful features for complex deployments.

The choice between Pulumi and other IaC tools ultimately depends on your team's expertise, requirements, and preferences. Teams with strong programming backgrounds often find Pulumi's approach more intuitive, while those comfortable with declarative configuration languages might prefer traditional tools like Terraform or CloudFormation.

As cloud infrastructure continues to grow in complexity, tools like Pulumi that bridge the gap between software development and infrastructure management will become increasingly valuable for organizations seeking to implement efficient, scalable, and maintainable infrastructure automation.

Configuration management Infrastructure programming langauge

Opinions expressed by DZone contributors are their own.

Related

  • Infrastructure-as-Code (IaC): Methodologies, Approach, and Best Practices
  • Development of System Configuration Management: Working With Secrets, IaC, and Deserializing Data in Go
  • The Ephemeral Cloud: A New Blueprint for Infrastructure Efficiency With Crossplane and kube-green
  • Development of System Configuration Management: Introduction

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