Top 5 Terraform Code Snippets

This document presents five essential Terraform code snippets that can help streamline your infrastructure as code (IaC) practices. These snippets cover various use cases, from creating virtual machines to managing cloud resources efficiently. Whether you are a beginner or an experienced user, these examples will enhance your Terraform skills and improve your cloud deployment processes.

1. Creating an AWS EC2 Instance

provider "aws" {
  region = "us-west-2"
}

resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe01e" # Replace with a valid AMI ID
  instance_type = "t2.micro"

  tags = {
    Name = "ExampleInstance"
  }
}
        

This snippet creates a simple EC2 instance in AWS. Make sure to replace the AMI ID with one that is available in your chosen region.

2. Setting Up an S3 Bucket

provider "aws" {
  region = "us-west-2"
}

resource "aws_s3_bucket" "example" {
  bucket = "my-unique-bucket-name"
  acl    = "private"

  tags = {
    Name        = "ExampleBucket"
    Environment = "Dev"
  }
}
        

This code creates an S3 bucket with a unique name and sets its access control list (ACL) to private. Remember to choose a globally unique bucket name.

3. Creating a VPC with Subnets

provider "aws" {
  region = "us-west-2"
}

resource "aws_vpc" "example" {
  cidr_block = "10.0.0.0/16"

  tags = {
    Name = "ExampleVPC"
  }
}

resource "aws_subnet" "example_subnet" {
  vpc_id            = aws_vpc.example.id
  cidr_block        = "10.0.1.0/24"
  availability_zone = "us-west-2a"

  tags = {
    Name = "ExampleSubnet"
  }
}
        

This snippet sets up a Virtual Private Cloud (VPC) along with a subnet. It defines the CIDR block for the VPC and the subnet, ensuring proper network segmentation.

4. Deploying an RDS Instance

provider "aws" {
  region = "us-west-2"
}

resource "aws_db_instance" "example" {
  allocated_storage    = 20
  engine             = "mysql"
  engine_version     = "8.0"
  instance_class     = "db.t2.micro"
  name               = "exampledb"
  username           = "admin"
  password           = "password123" # Use a more secure method for production
  skip_final_snapshot = true

  tags = {
    Name = "ExampleRDS"
  }
}
        

This code snippet creates an Amazon RDS instance for MySQL. Note that the password should be handled securely, especially in production environments.

5. Creating an IAM Role

provider "aws" {
  region = "us-west-2"
}

resource "aws_iam_role" "example" {
  name               = "example-role"
  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action    = "sts:AssumeRole"
        Effect    = "Allow"
        Principal = {
          Service = "ec2.amazonaws.com"
        }
      },
    ]
  })

  tags = {
    Name = "ExampleRole"
  }
}
        

This snippet defines an IAM role that can be assumed by EC2 instances. It includes a policy that allows EC2 to assume the role, which is essential for granting permissions to your resources.

Conclusion

These top five Terraform code snippets provide a solid foundation for managing cloud infrastructure. By utilizing these examples, you can efficiently deploy and manage resources in AWS, ensuring best practices in your infrastructure as code approach.