Error launching source instance: InvalidSubnetID.NotFound: The subnet ID 'XXX' does not exist

[John Kennedy]

I am VERY new to Terraform but I like it so far...

We have just started using Terraform in our existing AWS environment. Like many others, we are anxiously awaiting the ability to determine existing AWS environment state to be added.

Until then, we are creating tf files individually per server which I know is not the best way but I have to follow, for now.

I am trying to build an instance (tf file below) and I keep getting the above error. I am using the correct AWS keys and I know the subnet ID is correct. What am I missing? Is there a way to specify the VPC? 

If I remove the subnet line it complains about the default VPC which no longer exists (before I got here).

instance.tf:

resource "aws_instance" "<name>" {

  ami = "ami-XXX"

  instance_type = "m3.medium"

  subnet_id = "subnet-XXX"

  associate_public_ip_address = true

  source_dest_check = false

  iam_instance_profile = "<name>"

  user_data = "${replace(replace(file("files/standard-cloud-init.yaml"),"<serverhostname>", "hostname-1"),"<serverenvironment>","prod")}"

  key_name = "<name>"

  security_groups = ["sg-XXX"]

  tags {

      Name = "<hostname"

      Tier = "presentation"

      Customer = "<customer>"

      Profiles = "apache"

      Role = "cloud-proxy"

      Environment = "prod"

  }

  ebs_block_device {

      device_name = "/dev/sdf"

      volume_type = "gp2"

      volume_size = "25"

  }

  ebs_block_device {

      device_name = "/dev/sda"

      volume_type = "gp2"

      volume_size = "8"

  }

}

John Kennedy  (_8(|)
I have a yellow dog:
http://www.theyellowdogproject.com/The_Yellow_Dog_Project/About.html

Anatidaephobia is the fear that somehow, somewhere a duck is watching you - urbandictionary.com

The Dunning-Kruger effect occurs when incompetent people not only fail to realize their incompetence, but consider themselves much more competent than everyone else. Basically - they're too stupid to know that they're stupid.

VGSR Disclaimer: The opinions expressed in this email are mine and do not reflect the opinions of VGSR or their board of directors.

[Andrew Langhorn]

Unless I've misunderstood, you should probably look to define your VPC using the aws_vpc provider - details at https://terraform.io/docs/providers/aws/r/vpc.html - inside your Terraform VPC configuration first, then reference it's ID attribute (examples in the docs) to attach your EC2 instance to.

Happy to elaborate further if needs be.

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[John Kennedy]

Andrew,

Thanks for the info. If I do this, will Terraform remove and recreate the VPC since it has not been "listed" in the tfstate file or will Terraform go out and find the ID to output?

John

John Kennedy  (_8(|)
I have a yellow dog:
http://www.theyellowdogproject.com/The_Yellow_Dog_Project/About.html

Anatidaephobia is the fear that somehow, somewhere a duck is watching you - urbandictionary.com

The Dunning-Kruger effect occurs when incompetent people not only fail to realize their incompetence, but consider themselves much more competent than everyone else. Basically - they're too stupid to know that they're stupid.

VGSR Disclaimer: The opinions expressed in this email are mine and do not reflect the opinions of VGSR or their board of directors.

[Andrew Langhorn]

From memory, I've forgotten. But I think the tfstate file ignores things it previously knows about, so it may try and recreate it if it doesn't know about it regardless of whether it exists. Try creating a test VPC using Terraform then try recreating it again? Should be quite quick to do!

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[John Kennedy]

Thanks. It turns out the problem was permissions on my IAM account...The person responsible has been flogged.

Thanks and sorry to bother everyone with a non-Terraform issue

John Kennedy  (_8(|)
I have a yellow dog:
http://www.theyellowdogproject.com/The_Yellow_Dog_Project/About.html

Anatidaephobia is the fear that somehow, somewhere a duck is watching you - urbandictionary.com

The Dunning-Kruger effect occurs when incompetent people not only fail to realize their incompetence, but consider themselves much more competent than everyone else. Basically - they're too stupid to know that they're stupid.

VGSR Disclaimer: The opinions expressed in this email are mine and do not reflect the opinions of VGSR or their board of directors.