Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

During an OpenTofu deployment you need to replace an existing web-server EC2 instance without interrupting service. The current configuration contains:

resource "aws_security_group" "web_sg" {
  # … rules omitted …
}

resource "aws_instance" "web" {
  ami                    = "ami-0c55b159cbfafe1f0"
  instance_type          = "t3.micro"
  vpc_security_group_ids = [aws_security_group.web_sg.id]

  lifecycle {
    create_before_destroy = true
  }
}

Later, the AMI ID is updated in version control. When the next tofu apply runs, which statement accurately describes what will happen to the aws_instance.web resource?

  • OpenTofu will create a new EC2 instance first, and only after it is in service will it destroy the old one, minimizing downtime.

  • The create_before_destroy setting is overridden by the dependency on the security group, so both resources are destroyed and recreated in order.

  • OpenTofu will destroy the existing EC2 instance before creating a new one because the create_before_destroy argument is ignored for EC2 resources.

  • OpenTofu will prompt for user confirmation and then perform the default destroy-then-create sequence, effectively ignoring the lifecycle block.

CompTIA Linux+ XK0-006 (V8)
Automation, Orchestration, and Scripting
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