Infrastructure as Code (IaC): Terraform vs Pulumi vs CloudFormation
Manage cloud declarative state: Declarative vs Imperative IaC, Terraform State (terraform.tfstate), distributed locking with DynamoDB, drift detection, and modular architecture.
01.1. What is Infrastructure as Code (IaC) & Paradigms
Infrastructure as Code (IaC) is the architectural practice of provisioning, configuring, and managing cloud resources (VPCs, firewalls, subnets, Kubernetes clusters, managed databases) through declarative, version-controlled configuration files rather than manual point-and-click operations in web consoles (ClickOps).
IaC Paradigms: Declarative vs Imperative
- Declarative IaC (Terraform HCL, OpenTofu, AWS CloudFormation): You define the desired end-state (e.g., "A VPC with CIDR
10.0.0.0/16and 3 private subnets"). The IaC engine inspects the current state, computes the difference (diff), and determines the optimal sequence of API calls to achieve the desired state. - Imperative / General-Purpose IaC (Pulumi, AWS CDK): You define infrastructure using real programming languages (TypeScript, Python, Go, C#). This unlocks loops, classes, unit testing frameworks, and abstraction libraries, compiling down to a declarative object graph evaluated by the underlying engine.
| Feature | HashiCorp Terraform | Pulumi | AWS CloudFormation / CDK |
|---|---|---|---|
| Language | HCL (HashiCorp Configuration Language) | TypeScript, Python, Go, C# | YAML / JSON (or TS/Python via CDK) |
| Multi-Cloud | Yes (AWS, GCP, Azure, Kubernetes, 3,000+ providers) | Yes (AWS, GCP, Azure, K8s) | AWS Only (Proprietary engine) |
| State Storage | Explicit State File (terraform.tfstate) | Pulumi Service / S3 Backend | Managed internally by AWS |
| Ecosystem | Massive community module registry | Rapidly growing modern ecosystem | Native deep AWS service integration |
Terraform State Management & Distributed Locking Architecture 🏗️
Terraform State Management & Distributed Locking Architecture 🏗️
CI/CD pipeline orchestrating remote S3 state retrieval, DynamoDB distributed locking, DAG diff planning, and cloud provisioning.
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