Terraform Best Practices for Production Infrastructure

After years of managing cloud infrastructure with Terraform, we’ve learned what works and what doesn’t. Here are our battle-tested best practices.

State Management

Your Terraform state is the source of truth for your infrastructure. Protect it.

Use Remote State

Never store state locally for production infrastructure:

terraform {
  backend "s3" {
    bucket         = "my-terraform-state"
    key            = "prod/infrastructure.tfstate"
    region         = "eu-west-1"
    encrypt        = true
    dynamodb_table = "terraform-locks"
  }
}

State Locking

Always enable state locking to prevent concurrent modifications. DynamoDB works great with S3 backends.

Module Structure

Organize your Terraform code into reusable modules:

infrastructure/
├── modules/
│   ├── vpc/
│   ├── ec2/
│   └── rds/
├── environments/
│   ├── dev/
│   ├── staging/
│   └── prod/
└── global/
    └── iam/

Variables and Outputs

Use Descriptive Variable Names

variable "environment" {
  description = "Deployment environment (dev, staging, prod)"
  type        = string
  validation {
    condition     = contains(["dev", "staging", "prod"], var.environment)
    error_message = "Environment must be dev, staging, or prod."
  }
}

Export Important Outputs

Make it easy to reference resources across modules:

output "vpc_id" {
  description = "The ID of the VPC"
  value       = aws_vpc.main.id
}

Tagging Strategy

Consistent tagging is crucial for cost allocation and resource management:

locals {
  common_tags = {
    Environment = var.environment
    Project     = var.project_name
    ManagedBy   = "terraform"
    Owner       = var.team_email
  }
}

Plan Before Apply

Always review your changes:

terraform plan -out=tfplan
terraform apply tfplan

This ensures you apply exactly what you reviewed.

Ready to Level Up?

Whether you’re starting fresh or migrating existing infrastructure to Terraform, we can help. Contact us for a consultation.