Step-01: Introduction
- Understand Resource Meta-Argument
count
- Also implement count and count index practically
- In general, 1 EC2 Instance Resource in Terraform equals to 1 EC2 Instance in Real AWS Cloud
- 5 EC2 Instance Resources = 5 EC2 Instances in AWS Cloud
- With
Meta-Argument count this is going to become super simple.
- Lets see how.
# Create EC2 Instance
resource "aws_instance" "web" {
ami = "ami-047a51fa27710816e" # Amazon Linux
instance_type = "t2.micro"
count = 5
tags = {
"Name" = "web"
}
}
- Execute Terraform Commands
# Initialize Terraform
terraform init
# Terraform Validate
terraform validate
# Terraform Plan to Verify what it is going to create / update / destroy
terraform plan
# Terraform Apply to Create EC2 Instance
terraform apply
- Verify EC2 Instances and its Name
Step-03: Understand about count index
- If we currently see all our EC2 Instances has the same name
web
- Lets name them by using count index
web-0, web-1, web-2, web-3, web-4
# Create EC2 Instance
resource "aws_instance" "web" {
ami = "ami-047a51fa27710816e" # Amazon Linux
instance_type = "t2.micro"
count = 5
tags = {
#"Name" = "web"
"Name" = "web-${count.index}"
}
}
- Execute Terraform Commands
# Terraform Validate
terraform validate
# Terraform Plan to Verify what it is going to create / update / destroy
terraform plan
# Terraform Apply to Create EC2 Instance
terraform apply
# Destroy Terraform Resources
terraform destroy
# Remove Terraform Files
rm -rf .terraform*
rm -rf terraform.tfstate*
References