📘 Terraform Series – Day 6

🎯 Objective

In this hands-on, we will:

• Generate SSH key

• Create key pair using Terraform

• Configure VPC & Security Group

• Launch EC2 instance

• Connect via SSH

• Clean up resources

👉 This is your first real-world Terraform task

🧩 Step 1: Generate SSH Key

ssh-keygen

✔ This creates:

• terra-key-aws→ Private key

• terra-key-ec2.pub → Public key

👉 We will use this to access EC2

📄 Step 2: Create Terraform File

touch ec2.tf

🧱 Step 3: Add Terraform Code

# Create Key Pair
resource "aws_key_pair" "my_key" {
  key_name   = "terra-key-aws"
  public_key = file("terra-key-aws.pub")
}


# Default VPC
resource "aws_default_vpc" "default" {}

# Security Group
resource "aws_security_group" "my_groups" {
  name        = "my-group"
  description = "Security group for EC2"
  vpc_id      = aws_default_vpc.default.id

  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow SSH"
  }

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow HTTP"
  }

  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
    description = "Allow all outbound"
  }

  tags = {
    Name = "automate-sg"
  }
}

# EC2 Instance
resource "aws_instance" "my_instance" {
  ami                    = "ami-0cb91c7de36eed2cb"
  instance_type          = "t2.micro"
  key_name               = aws_key_pair.my_key.key_name
  vpc_security_group_ids = [aws_security_group.my_groups.id]

  root_block_device {
    volume_size = 10
    volume_type = "gp3"
  }

  tags = {
    Name = "terra-ec2"
  }
}

⚙️ Step 4: Initialize Terraform

terraform init

✔ Downloads AWS provider

✔ Prepares working directory

✅ Step 5: Validate Configuration

terraform validate

✔ Ensures syntax is correct

📊 Step 6: Plan Execution

terraform plan

✔ Shows resources to be created:

• Key Pair

• VPC

• Security Group

• EC2 Instance

🚀 Step 7: Apply (Create Infrastructure)

terraform apply

👉 Type yes to confirm

❌ Common Error: Not Authorized

👉 Reason:

• IAM user does not have required permissions

✔ Fix:

Go to AWS IAM → Attach Policy

• AdministratorAccess (easy way)

  OR

• EC2FullAccess

• VPCFullAccess

🖥 Step 8: Verify in AWS Console

Go to EC2 Dashboard:

✔ Instance running
✔ Security group attached
✔ Key pair created

🔐 Step 9: Fix Key Permission

chmod 400 terra-key-aws

👉 Required before SSH

🔗 Step 10: Connect to EC2

ssh -i terra-key-aws ubuntu@<your-public-ip>

👉 Now your server is live 🚀

🧹 Step 11: Destroy Resources (IMPORTANT)

terraform destroy

👉 Prevent unnecessary AWS charges 💸

👨‍💻 About the Author

“A complete Terraform series covering everything from fundamentals to advanced real-world infrastructure automation in a DevOps environment.”

📬 Let's Stay Connected

• 📧 Email: gujjarapurv181@gmail.com

• 🐙 GitHub: github.com/ApurvGujjar07

• 💼 LinkedIn: linkedin.com/in/apurv-gujjar