Terraform block - datas

The data block fetches external data at plan time, and passes it as input (like a parameter) to other blocks (usually resource blocks). It doesn’t manage or change the external resource — just reads its attributes for use elsewhere.

data "aws_ami" "amazon_linux" {
  most_recent = true
  owners      = ["amazon"]

  filter {
    name   = "name"
    values = ["amzn2-ami-hvm-*-x86_64-gp2"]
  }
}

resource "aws_instance" "web" {
  ami           = data.aws_ami.amazon_linux.id
  instance_type = "t2.micro"
}